Flood season urban river water environment management method and system based on risk early warning

Abstract

The invention relates to the technical field of environment early warning, and discloses a flood season urban river water environment management method and system based on risk early warning, and the method comprises the steps: obtaining historical monitoring data of a target river, and analyzing and determining a rainfall early warning threshold value based on the historical monitoring data; obtaining a forecast rainfall capacity, and carrying out pre-rain early warning based on the forecast rainfall capacity and a rainfall capacity early warning threshold value; in the rainfall process, real-time water quality index values of the multiple water quality monitoring points are obtained in real time, and real-time early warning is conducted on all the water quality monitoring points based on the real-time water quality index values and the water quality deterioration standard. According to the invention, by analyzing the influence of the rainfall on the riverway risk, early warning before raining is realized, real-time early warning is realized in combination with real-time monitoring, the whole-course monitoring of the water pollution of the riverway in the flood season is improved, the influence of the rainfall on the water pollution of the riverway is accurately grasped, and the combination of early warning in advance and real-time early warning can enable resources to be configured more optimally in time and space, so that the water pollution of the riverway is prevented. The resource utilization efficiency is improved, and the river water environment is better protected.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental early warning, and particularly to a method and system for managing the water environment of urban rivers during the flood season based on risk early warning. Background Art

[0002] With the advancement of water environment governance work, point sources (pollution sources with fixed discharge points) have been basically controlled, and combined sewer overflows and urban non-point source pollution have become the main reasons for the deterioration of the water quality of urban rivers during the flood season. The combined sewer drainage system collects and conveys rainwater, domestic sewage and industrial wastewater through the same pipeline. When the rainfall exceeds the network load or the treatment capacity of the sewage treatment plant, the mixed sewage will be directly discharged into the water body through the overflow well, forming combined sewer overflow pollution; in addition, due to the combined sewer drainage system, when the rainfall exceeds a certain threshold, the amount of sewage entering the sewage treatment plant exceeds the treatment load of the sewage treatment plant, resulting in pre-factory overflow. To further reduce the pollution load entering the river, the sewage treatment plant filters the excess sewage through a coarse grid and then discharges it into the river, which is simply called "sewage treatment plant bypass". In addition to combined sewer overflows, the erosion of surface pollutants by rainfall runoff entering the water body through rainwater pipes or other channels will also exacerbate the deterioration of water quality. This part of pollution is usually called "non-point source pollution".

[0003] Combined sewer overflow pollution and urban non-point sources are affected by factors such as rainfall, the duration of sunny days before rainfall, and the underlying surface. The simulation prediction methods based on mechanism and data-driven require high data requirements and low accuracy. In addition, the current water environment management still mainly focuses on non-rainy periods, lacking a forecast and early warning mechanism for water environment management during the flood season, resulting in a relatively passive response of river and lake management departments to pollution entering the river during the flood season. Only after serious consequences are caused by risks such as combined sewer outfall overflow, sewage treatment plant bypass, and exceeding the standard of river water quality can they be known, and it is impossible to pre-warn of the water pollution risk during the flood season and take timely measures, resulting in serious problems of water environmental pollution in rivers during the flood season. Summary of the Invention

[0004] In view of this, the present invention provides a method and system for managing the water environment of urban rivers during the flood season based on risk early warning to solve the problem of the lack of a water pollution risk early warning method during the flood season.

[0005] In the first aspect, the present invention provides a method for managing the water environment of urban rivers during the flood season based on risk early warning, the method comprising:

[0006] Obtaining historical monitoring data of the target river and determining a rainfall early warning threshold based on the analysis of the historical monitoring data;

[0007] Obtaining the forecast rainfall and performing pre-rain early warning based on the forecast rainfall and the rainfall early warning threshold;

[0008] During the rainfall process, the real-time water quality index values of multiple water quality monitoring points are obtained in real time, and real-time early warnings are issued for each water quality monitoring point based on the real-time water quality index values and the water quality deterioration standards.

[0009] The method for managing the urban river water environment during the flood season based on risk early warning provided by the present invention analyzes the influence of rainfall on river risks based on historical monitoring data of the target river, realizes early warning before rain, and at the same time combines real-time monitoring to achieve real-time risk early warning, improves the whole-process monitoring of river water pollution during the flood season, accurately grasps the influence of precipitation on river water pollution, and the combination of early warning and real-time early warning can optimize the allocation of resources in terms of time and space, improve resource utilization efficiency, reduce treatment costs, and better protect the river water environment.

[0010] In an optional implementation manner, determining the rainfall early warning threshold based on historical monitoring data analysis includes:

[0011] Analyze the relationships between rainfall and overflows at overflow outlets, sewage treatment plant overflows, and river water quality based on historical monitoring data;

[0012] Determine the first rainfall early warning threshold according to the relationship between rainfall and overflows at overflow outlets, determine the second rainfall early warning threshold according to the relationship between rainfall and sewage treatment plant overflows, and determine the third rainfall early warning threshold according to the relationship between river water quality and rainfall;

[0013] Compare the first rainfall early warning threshold, the second rainfall early warning threshold, and the third rainfall early warning threshold, and determine the rainfall early warning threshold according to the comparison result.

[0014] The method for managing the urban river water environment during the flood season based on risk early warning provided by the present invention determines three rainfall early warning thresholds by analyzing the influence of rainfall on overflows at overflow outlets, sewage treatment plant overflows, and river water quality using historical monitoring data, and realizes a comprehensive prediction of the water pollution risk during the flood season based on the predicted rainfall.

[0015] In an optional implementation manner, determining the first rainfall early warning threshold according to the relationship between rainfall and overflows at overflow outlets includes:

[0016] Obtain the overflow rainfall when the target overflow outlet overflows during multiple rainfall events;

[0017] Construct an overflow box plot of the target overflow outlet based on the overflow rainfall, and determine the overflow threshold of the target overflow outlet according to the overflow box plot;

[0018] Obtain the overflow thresholds of multiple target overflow outlets, compare the magnitudes of the overflow thresholds, and take the smallest overflow threshold as the first rainfall early warning threshold.

[0019] In an optional implementation manner, determining the second rainfall early warning threshold according to the relationship between rainfall and sewage treatment plant overflows includes:

[0020] Obtain the crossing rainfall when sewage crossing occurs at the target sewage treatment plant during multiple rainfall events;

[0021] Construct a crossing box plot for the target sewage treatment plant based on the crossing rainfall, and determine the crossing threshold of the target sewage treatment plant according to the crossing box plot;

[0022] Obtain the crossing thresholds of multiple target sewage treatment plants, compare the magnitudes of the crossing thresholds, and take the smallest crossing threshold as the second rainfall warning threshold.

[0023] In an optional implementation manner, determining the third rainfall warning threshold according to the relationship between the river water quality and rainfall includes:

[0024] Obtain the average rainfall of multiple rainfall events, and draw the corresponding river water quality map according to the number of rainfall events;

[0025] Determine the preset index thresholds corresponding to each water quality index according to the water quality deterioration standard, and mark the preset index thresholds on the river water quality map;

[0026] Based on the marked river water quality map, determine the maximum rainfall when the river water quality does not exceed the standard as the third rainfall warning threshold.

[0027] The method for managing the urban river water environment during the flood season based on risk warning provided by the present invention uses a box plot to intuitively present the rainfall distribution when overflows occur at the overflow outlets and sewage crossings occur at the sewage treatment plants during different rainfall events, and then determines the first rainfall warning threshold and the second rainfall warning threshold. By drawing the river water quality map and marking the water quality indicators, the third rainfall warning threshold is determined, and accurate classification warnings for river water pollution risks are achieved through the three rainfall warning thresholds.

[0028] In an optional implementation manner, performing pre-rain warnings based on the forecast rainfall and the rainfall warning thresholds includes:

[0029] If the forecast rainfall is less than the first rainfall warning threshold, there is no warning;

[0030] If the forecast rainfall is not less than the first rainfall warning threshold and the forecast rainfall is not greater than the second rainfall warning threshold, issue an overflow warning for the overflow outlet;

[0031] If the forecast rainfall is not less than the second rainfall warning threshold and the forecast rainfall is not greater than the third rainfall warning threshold, issue a sewage crossing warning for the sewage treatment plant;

[0032] If the forecast rainfall is greater than the third rainfall warning threshold, issue a water quality exceeding standard warning.

[0033] The method for managing the water environment of urban rivers during the flood season based on risk warning provided by the present invention analyzes the relationship between the predicted rainfall and three rainfall warning thresholds, and issues different warnings, facilitating the water environment management department to take effective measures in a timely manner according to the issued warnings and improving the water environment of urban rivers during the flood season.

[0034] In an optional implementation manner, real-time warnings are carried out for each water quality monitoring point based on the real-time water quality index value and the water quality deterioration standard, including:

[0035] When the real-time water quality index value is not less than the preset index threshold, timing starts, and the first duration during which the real-time water quality index value is not less than the preset index threshold is recorded;

[0036] If the first duration is greater than the first preset time threshold, a water quality deterioration warning is issued;

[0037] When the real-time water quality index value is less than the preset index threshold, timing starts, and the second duration during which the real-time water quality index value is less than the preset index threshold is recorded;

[0038] If the second duration is greater than the first preset time threshold, the water quality deterioration warning is lifted.

[0039] In an optional implementation manner, the water quality index value includes the dissolved oxygen content and the ammonia nitrogen content. Real-time warnings are carried out for each water quality monitoring point based on the real-time water quality index value and the water quality deterioration standard, and it further includes:

[0040] During the rainfall process, the real-time dissolved oxygen content and the real-time ammonia nitrogen content of multiple water quality monitoring points are obtained in real time;

[0041] When the real-time dissolved oxygen content is less than the preset dissolved oxygen content threshold and the real-time ammonia nitrogen content is greater than the preset ammonia nitrogen content threshold, timing starts to obtain the third duration;

[0042] If the third duration is greater than the second preset time threshold, a dead fish warning is issued.

[0043] The method for managing the water environment of urban rivers during the flood season based on risk warning provided by the present invention uses online monitoring equipment to obtain the water quality index parameters of the river in real time at the water quality monitoring points. The real-time monitored data is more real. Once the data is abnormal, an alarm can be immediately issued, and improvement measures can be taken in a timely manner to minimize the impact of pollution on the water environment of the river.

[0044] In the second aspect, the present invention provides a system for managing the water environment of urban rivers during the flood season based on risk warning. The system includes:

[0045] A rainfall warning threshold determination module, configured to obtain the historical monitoring data of the target river and determine the rainfall warning threshold based on the analysis of the historical monitoring data;

[0046] A pre-rain warning module, configured to obtain the predicted rainfall amount and perform pre-rain warning based on the predicted rainfall amount and the rainfall warning threshold value;

[0047] A real-time warning module, configured to, during the rainfall process, obtain the real-time water quality index values of multiple water quality monitoring points in real time, and perform real-time warning on each water quality monitoring point based on the real-time water quality index values and the water quality deterioration standard.

[0048] In a third aspect, the present invention provides a computer device, including: a memory and a processor, which are communicatively connected to each other, wherein the memory stores computer instructions, and the processor executes the computer instructions to execute the method according to the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0050] Figure 1 is a schematic flowchart of a method for managing the water environment of urban rivers during the flood season based on risk warning according to an embodiment of the present invention;

[0051] Figure 2 is a schematic flowchart of another method for managing the water environment of urban rivers during the flood season based on risk warning according to an embodiment of the present invention;

[0052] Figure 3 is a schematic overall logic diagram of a method for managing the water environment of urban rivers during the flood season based on risk warning according to an embodiment of the present invention;

[0053] Figure 4 is a schematic diagram of the basic situation of the target river in the specific implementation of a method for managing the water environment of urban rivers during the flood season based on risk warning according to an embodiment of the present invention;

[0054] Figure 5 is a schematic box diagram of the overflow of three overflow outlets of the target river in the specific implementation of a method for managing the water environment of urban rivers during the flood season based on risk warning according to an embodiment of the present invention;

[0055] Figure 6 is a schematic diagram of the water quality detection results of the target river in the specific implementation of a method for managing the water environment of urban rivers during the flood season based on risk warning according to an embodiment of the present invention;

[0056] Figure 7It is another schematic diagram of the water quality detection result of the target river channel in the specific implementation of the flood season urban river channel water environment management method based on risk early warning according to an embodiment of the present invention;

[0057] Figure 8 It is a structural block diagram of a flood season urban river channel water environment management system based on risk early warning according to an embodiment of the present invention;

[0058] Figure 9 It is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. Detailed implementation manners

[0059] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0060] An embodiment of the present invention provides a flood season urban river channel water environment management method based on risk early warning, which combines pre-rain early warning and real-time early warning to achieve the effect of comprehensive early warning and monitoring of the flood season river channel water environment.

[0061] According to an embodiment of the present invention, an embodiment of a flood season urban river channel water environment management method based on risk early warning is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0062] In this embodiment, a flood season urban river channel water environment management method based on risk early warning is provided, which can be used in the above computer system. Figure 1 It is a flowchart of a flood season urban river channel water environment management method based on risk early warning according to an embodiment of the present invention. As Figure 1 shown, the process includes the following steps:

[0063] Step S101, obtain the historical monitoring data of the target river channel, and determine the rainfall early warning threshold based on the analysis of the historical monitoring data.

[0064] Specifically, collect the historical monitoring data of the target river channel, including but not limited to: rainfall, combined sewer overflow outlets, sewage treatment plant overflows, and river channel cross-section water quality monitoring data, social complaints, dead fish and other related data.

[0065] Analyze the correlation between various risks and rainfall based on historical monitoring data, that is, determine which risks will occur when the rainfall is a certain number of millimeters. Usually, in the pre-rain warning stage, the pre-rain warning elements involved include, but are not limited to, three types of risks: overflows at overflow outlets, bypasses at sewage treatment plants, and exceeding the water quality standards of river channels.

[0066] Step S102: Obtain the predicted rainfall and conduct pre-rain warning based on the predicted rainfall and the rainfall warning threshold.

[0067] Specifically, in the pre-rain stage, the predicted rainfall in the area where the target river section is located can be obtained through the meteorological forecast of the meteorological station. Based on the relationship between the predicted rainfall, the rainfall threshold in step S101, and different risks, one or several types of existing risks can be determined to achieve pre-rain warning.

[0068] Step S103: During the rainfall process, continuously obtain the real-time water quality index values of multiple water quality monitoring points, and conduct real-time warning for each water quality monitoring point based on the real-time water quality index values and the water quality deterioration standard.

[0069] Specifically, the water quality monitoring points can be set in the sensitive river sections of the target river. The sensitive river sections are the river sections where the public complains during the flood season or the river sections within 100 m downstream of the overflow outlets or bypasses of sewage treatment plants. According to existing research, usually, the complaint points will highly overlap with the overflow outlets and bypasses of sewage treatment plants. Therefore, if there is no social complaint data, the river sections within 100 m downstream of the overflow outlets and bypasses of sewage treatment plants can be used as sensitive river sections. The positions of the water quality monitoring points can also be set at other positions of the target river according to actual needs, only for example, but not limited to this. The pre-rain warning is based on the predicted rainfall; the real-time warning is based on the real-time perception data during and after the rain.

[0070] The water quality monitoring points use water quality automatic detection equipment to continuously obtain the monitoring data of multiple water quality indicators at the set monitoring frequency. The water quality indicators include, but are not limited to, Chemical Oxygen Demand (COD), dissolved oxygen (DO), biochemical oxygen demand, ammonia nitrogen (NH3-N), etc.

[0071] The real-time warning elements involved during the rainfall process include, but are not limited to, the risk of water quality deterioration and the risk of dead fish. The risk of water quality deterioration is specified by humans. That is, when the water quality exceeds the water quality index value determined by the Class V surface water standard and the duration exceeds the duration threshold specified in the standard (considering the rainfall duration and the confluence time, the duration threshold is generally not less than two hours), it is determined that the water quality has deteriorated and a warning needs to be issued. The dead fish warning is determined based on the correlation between water quality and dead fish.

[0072] The method for managing the water environment of urban rivers during the flood season based on risk early warning provided in this embodiment analyzes the impact of rainfall on river risks based on the historical monitoring data of the target river, realizes early warning before rain, and combines real-time monitoring to achieve real-time risk early warning, improves the whole-process monitoring of water pollution in rivers during the flood season, accurately grasps the impact of precipitation on river water pollution, and the combination of early warning and real-time early warning enables resources to be more optimally allocated in terms of time and space, improves resource utilization efficiency, reduces treatment costs, and better protects the water environment of the river.

[0073] In this embodiment, a method for managing the water environment of urban rivers during the flood season based on risk early warning is provided, which can be used in the above computer system. Figure 2 It is a flowchart of the method for managing the water environment of urban rivers during the flood season based on the embodiment of the present invention. As Figure 2 shown, this process includes the following steps:

[0074] Step S201, obtain the historical monitoring data of the target river, and determine the rainfall early warning threshold based on the analysis of the historical monitoring data.

[0075] Specifically, the above step S201 includes:

[0076] Step S2011, analyze the relationship between the overflow of the overflow outlet, the overstep of the sewage treatment plant, the river water quality and the rainfall based on the historical monitoring data.

[0077] Specifically, as Figure 3 shown, it is the overall logic schematic diagram of this embodiment. After collecting the historical monitoring data, conduct the correlation analysis of the overflow of the overflow outlet, the overstep of the sewage treatment plant, the river water quality and the rainfall, and then conduct the actual risk early warning according to the analysis results, and integrate the risk early warning method into the management platform for integration. Determine the monitoring data of the rainfall event based on the historical monitoring data, and determine the time point T i when the i-th overflow outlet Y i has an overflow during the first rainfall process, the cumulative rainfall Y i P1 of the rain gauge station, and sequentially count the cumulative rainfall Y i P2,... Y i P n corresponding to the i-th overflow outlet during the second rainfall,..., the n-th rainfall, and analyze the critical rainfall when the i-th overflow outlet has an overflow based on the cumulative rainfall of each rainfall event of the i-th overflow outlet.

[0078] The statistical method of the overstep of the sewage treatment plant on the rainfall is the same as that of the overflow of the overflow outlet, which will not be elaborated here. It should be noted that the water collection range of the sewage treatment plant is large, and the areal rainfall of its water collection range needs to be statistically analyzed, that is, the average value of multiple rain gauge stations is used as the cumulative rainfall.

[0079] For the water quality of river channels, historical monitoring data of the water quality of river channel cross-sections in the study area are usually obtained. One cross-section is counted for one river channel. If the target river channel is long and the coverage density of automatic monitoring stations (water quality monitoring points) is sufficient, multiple cross-sections can be selected for data analysis for one river channel.

[0080] Step S2012: Determine the first rainfall warning threshold according to the relationship between the overflow of the overflow outlet and rainfall, determine the second rainfall warning threshold according to the relationship between the sewage treatment plant overflow and rainfall, and determine the third rainfall warning threshold according to the relationship between the river channel water quality and rainfall.

[0081] In some optional embodiments, determining the first rainfall warning threshold according to the relationship between the overflow of the overflow outlet and rainfall in the above step S2012 includes:

[0082] Step a1: Obtain the overflow rainfall when the target overflow outlet overflows during multiple rainfall events.

[0083] Specifically, count the cumulative rainfall Y i P1, Y i P2,..., Y i P n corresponding to the overflow of the i-th overflow outlet during the first rainfall, the second rainfall,..., the n-th rainfall as the overflow rainfall of the i-th overflow outlet in each rainfall event.

[0084] Step a2: Construct an overflow box plot of the target overflow outlet based on the overflow rainfall, and determine the overflow threshold of the target overflow outlet according to the overflow box plot.

[0085] Specifically, since the rainfall amount, rainfall intensity, etc. of each rainfall event are different, the time when the overflow outlet overflows and the statistically obtained overflow rainfall are also different. Construct an overflow box plot of the target overflow outlet based on the multiple overflow rainfalls of the target overflow outlet. The overflow box plot can intuitively reflect the range of cumulative rainfall when the target overflow outlet overflows. According to experience, a value can be selected from the range of cumulative rainfall as the overflow threshold of the target overflow outlet. The selected overflow threshold can be the median, minimum value, etc. of the range of cumulative rainfall. For example, if the range of cumulative rainfall is [8mm - 12mm], the overflow threshold of the target overflow outlet can be selected as 10mm, just as an example, but not limited thereto.

[0086] Step a3: Obtain the overflow thresholds of multiple target overflow outlets, compare the magnitudes of the overflow thresholds, and take the smallest overflow threshold as the first rainfall warning threshold.

[0087] Specifically, the target overflow outlets can be the key or all overflow outlets in the target river channel. Obtain the overflow thresholds of multiple target overflow outlets according to the process in steps a1 - a2. By comparing the magnitudes of the overflow thresholds, take the smallest overflow threshold as the critical rainfall amount Y for the overflow of the overflow outlet i P min , that is, the first rainfall warning threshold. For example, a certain target river channel includes 5 target overflow outlets, and the overflow thresholds of each target overflow outlet are respectively: 10mm, 8mm, 7mm, 7.5mm, 8.5mm, then the first rainfall warning threshold is 7mm.

[0088] In some optional implementation manners, determining the second rainfall warning threshold according to the relationship between the sewage plant's overflow and rainfall in the above step S2012 includes:

[0089] Step a4, obtain the crossing rainfall amounts when sewage overflows occur in the target sewage plant during multiple rainfall events.

[0090] Specifically, because the water collection range of the sewage plant is large, when counting the crossing rainfall amounts, it is necessary to count the areal rainfall of the water collection range of the sewage plant, that is, obtain the rainfall monitoring values of multiple rain gauges within the water collection range of the target sewage plant during each rainfall event, and calculate the average of the multiple rainfall monitoring values as the crossing rainfall amount of the target sewage plant during this rainfall event.

[0091] Step a5, construct a crossing box plot of the target sewage plant based on the crossing rainfall amounts, and determine the crossing threshold of the target sewage plant according to the crossing box plot.

[0092] Specifically, because the rainfall magnitude, rainfall intensity, etc. of each rainfall event are different, the time when sewage overflows occur in the sewage plant and the counted crossing rainfall amounts are also different. Construct a crossing box plot of the target sewage plant based on the multiple crossing rainfall amounts of the target sewage plant. The crossing box plot can intuitively reflect the cumulative rainfall range when sewage overflows occur in the target sewage plant. According to experience, a value can be selected from the cumulative rainfall range as the crossing threshold of the target sewage plant. The selected crossing threshold can be the median, minimum value, etc. of the cumulative rainfall range. For example, if the cumulative rainfall range is [10mm - 15mm], the crossing threshold of the target sewage plant can be selected as 12mm, just for example, but not limited thereto.

[0093] Step a6, obtain the crossing thresholds of multiple target sewage plants, compare the magnitudes of the crossing thresholds, and take the smallest crossing threshold as the second rainfall warning threshold.

[0094] Specifically, the target sewage plants can be the key or all sewage plants in the target river channel. Obtain the crossing thresholds of multiple target sewage plants according to the process in steps a4 - a5. By comparing the magnitudes of the crossing thresholds, take the smallest crossing threshold as the critical rainfall amount Y for the sewage plant to overflow iP i , which is the second rainfall warning threshold. For example, a target river course includes 3 target sewage treatment plants, and the crossing thresholds of each target sewage treatment plant are: 10mm, 12mm, and 13mm respectively. Then the second rainfall warning threshold is 10mm.

[0095] In some optional implementation manners, determining the third rainfall warning threshold according to the relationship between the river course water quality and the rainfall in the above step S2012 includes:

[0096] Step a7: Obtain the average rainfall of multiple rainfall events, and draw the corresponding river course water quality map according to the number of rainfall events.

[0097] Specifically, obtain the historical monitoring data of the water quality of the target river course section in the study area. Generally, only one river course section is counted for one river course. If the river course is long and the coverage density of the automatic monitoring stations is sufficient, multiple sections can be selected. In this embodiment, one river course section is used for discussion. Count the average rainfall of the rainfall events of the rain gauges within the basin range above the river course section, and draw the corresponding river course water quality map according to the average rainfall of the rainfall events as the rainfall of each event.

[0098] Step a8: Determine the preset index thresholds corresponding to each water quality index according to the water quality deterioration standard, and mark the preset index thresholds on the river course water quality map.

[0099] Specifically, draw the standard limit values corresponding to each index according to the river course water quality function zoning, so as to clearly see whether the rainfall of this event exceeds the standard (the water quality index can be drawn according to the actual situation). If there are data for two years or more, multiple maps are made.

[0100] Step a9: Based on the marked river course water quality map, determine the maximum rainfall when the river course water quality does not exceed the standard as the third rainfall warning threshold.

[0101] Specifically, count that under the condition of the vast majority of rainfall events, when the rainfall is lower than a certain value PR, the river course water quality is basically not exceeding the standard, and when it exceeds a certain value, it exceeds the standard. Generally, the value of PR will be greater than the first rainfall warning threshold and close to the second rainfall warning threshold, which depends on the positional relationship between the river course section and the overflow outlet and the crossing of the sewage treatment plant. Take PR as the critical rainfall for river course water quality exceeding the standard for the release of river course water quality exceeding the standard warning, that is, the third rainfall warning threshold.

[0102] The method for managing the urban river course water environment during the flood season based on risk warning provided by this embodiment uses a box plot to visually present the rainfall distribution when the overflow outlet overflows and the sewage treatment plant crosses in different rainfall events, and then determines the first rainfall warning threshold and the second rainfall warning threshold. By drawing the river course water quality map and marking the water quality indexes, the third rainfall warning threshold is determined, and accurate classification warnings for the river course water pollution risk are realized through the three rainfall warning thresholds.

[0103] Step S2013: Compare the first rainfall warning threshold, the second rainfall warning threshold, and the third rainfall warning threshold, and determine the rainfall warning threshold according to the comparison result.

[0104] Specifically, the determination of the first rainfall warning threshold, the second rainfall warning threshold, and the third rainfall warning threshold can be adjusted according to the actual situation and experience. Generally, the relationship among the three rainfall warning thresholds is: the first rainfall warning threshold ≤ the second rainfall warning threshold ≤ the third rainfall warning threshold.

[0105] The method for managing the water environment of urban rivers during the flood season based on risk warning provided in this embodiment realizes the comprehensive prediction of the water pollution risk during the flood season based on the predicted rainfall by analyzing the influence of rainfall on the overflow of the overflow outlet, the bypass of the sewage treatment plant, and the water quality of the river through the use of historical monitoring data, and determining three rainfall warning thresholds.

[0106] Step S202: Obtain the predicted rainfall, and conduct pre-rain warning based on the predicted rainfall and the rainfall warning threshold.

[0107] Specifically, the above step S202 includes:

[0108] Step S2021: If the predicted rainfall is less than the first rainfall warning threshold, there is no warning.

[0109] Step S2022: If the predicted rainfall is not less than the first rainfall warning threshold and not greater than the second rainfall warning threshold, issue an overflow warning for the overflow outlet.

[0110] Step S2023: If the predicted rainfall is not less than the second rainfall warning threshold and not greater than the third rainfall warning threshold, issue a bypass warning for the sewage treatment plant.

[0111] Step S2024: If the predicted rainfall is greater than the third rainfall warning threshold, issue a water quality exceeding standard warning.

[0112] The method for managing the water environment of urban rivers during the flood season based on risk warning provided in this embodiment issues different warnings by analyzing the relationship between the predicted rainfall and the three rainfall warning thresholds, which is convenient for the water environment management department to take effective measures in a timely manner according to the issued warnings to improve the water environment of urban rivers during the flood season.

[0113] Step S203: During the rainfall process, obtain the real-time water quality index values of multiple water quality monitoring points in real time, and conduct real-time warning for each water quality monitoring point based on the real-time water quality index values and the water quality deterioration standard.

[0114] Specifically, the above step S203 includes:

[0115] Step S2031: When the real-time water quality index value is not less than the preset index threshold, start timing and record the first duration during which the real-time water quality index value is not less than the preset index threshold.

[0116] Step S2032: If the first duration is greater than the first preset time threshold, issue a water quality deterioration warning.

[0117] Step S2033: When the real-time water quality index value is less than the preset index threshold, start timing and record the second duration during which the real-time water quality index value is less than the preset index threshold.

[0118] Step S2034: If the second duration is greater than the first preset time threshold, cancel the water quality deterioration warning.

[0119] Specifically, considering that the water quality of the river channel will deteriorate during rainfall, a water quality deterioration warning can be issued when the water quality exceeds the Class V surface water standard and the duration exceeds 2 hours. Multiple water quality indicators can be selected. If one water quality indicator does not meet the standard, it means the water quality does not meet the standard. If the duration exceeds the preset time (2 hours), a water quality deterioration warning will be issued. Taking COD as an example, when COD ≥ 40 mg / L and the duration exceeds 2 hours, a water quality deterioration warning is issued. When COD < 40 mg / L and the duration exceeds 2 hours, the warning is cancelled. For the warning river section (which can be used if there are multiple water quality automatic monitoring stations), if the water quality monitored at a certain monitoring site reaches the warning standard, a warning will be issued for that point; if adjacent monitoring sites are all warning, the river section between the monitoring sites is the warning river section.

[0120] Step S2035: During the rainfall process, real-time obtain the real-time dissolved oxygen content and real-time ammonia nitrogen content of multiple water quality monitoring points.

[0121] Step S2036: When the real-time dissolved oxygen content is less than the preset dissolved oxygen content threshold and the real-time ammonia nitrogen content is greater than the preset ammonia nitrogen content threshold, start timing to obtain the third duration.

[0122] Step S2037: If the third duration is greater than the second preset time threshold, issue a dead fish warning.

[0123] Specifically, the data related to dead fish generally includes dead fish incidents, dead fish locations, etc., which can be obtained by the management unit providing data or using online media data. Based on the statistical analysis of the river water quality data, in this embodiment, based on a large amount of historical data analysis, it shows that when dead fish occur in the river, the water quality index dissolved oxygen (DO) is lower than 2 mg / L, ammonia nitrogen (NH3-N) exceeds 2 mg / L, and the duration generally exceeds 6 hours. The dead fish early warning index is DO < 2 mg / L or NH3-N > 2 mg / L, and the duration exceeds 6 hours (if the river water environment automatic monitoring equipment does not have the NH3-N index, only DO can be considered). The parameter values in different regions may be different. If there is no relevant data, this index can be referred to.

[0124] The method for managing the urban river water environment during the flood season based on risk early warning provided in this embodiment uses online monitoring equipment to obtain the water quality index parameters of the river in real time at the water quality monitoring points. The real-time monitored data is more real. Once the data is abnormal, an alarm can be immediately issued, and improvement measures can be taken in a timely manner to minimize the impact of pollution on the river water environment.

[0125] In a specific embodiment, there is one national assessment section in the target river basin, and multiple water quality automatic monitoring stations are set up. In this embodiment, only the national assessment section is considered for the water quality monitoring data. As Figure 4 shown, it is a schematic diagram of the basic situation of the target river. There are a total of 6 key overflow outlets, 2 sewage treatment plant crossing outlets, and a total of 4 sensitive river sections, namely MR1 - MR4. The overflow situation of the overflow outlets is monitored for 3 years; there are a total of 4 sewage treatment plants in the basin, and there are factory front overflow and crossing situations in two of the sewage treatment plants, and monitoring equipment is installed.

[0126] Based on the analysis results of the monitored rainfall for 2 years, the 25% quantiles of the overflow critical rainfall box plots of the three key overflow outlets are 8, 7.5, and 8.5 respectively. As Figure 5 shown, it is the overflow box plot of the three overflow outlets, then the critical rainfall value of the overflow volume is taken as 7.5 mm, and for the convenience of subsequent early warning, it is taken as 7 mm. The critical rainfall value for the crossing of 2 sewage treatment plants is statistically obtained as 10 mm.

[0127] Using the data of the river water quality of the national assessment section for two consecutive years, draw two water quality maps as Figure 6 、 Figure 7 and analyze the following conclusions: Except for slight exceeding the standard when the rainfall in individual sessions before July is less than 10 mm (i.e., light rain level), in most cases, only when the rainfall exceeds 10 mm (i.e., moderate rain and above level), the river water quality will exceed the standard.

[0128] The water quality index dissolved oxygen (DO) is lower than 2 mg / L, and ammonia nitrogen (NH3-N) exceeds 2 mg / L, and the duration generally exceeds 6 h. The dead fish warning index is DO < 2 mg / L or NH3-N > 2 mg / L, and the duration exceeds 6 h.

[0129] Based on this embodiment, the pre-rain warning and real-time warning rules include:

[0130] (1) When the predicted rainfall is less than 7 mm, there is no warning; if the rainfall is greater than or equal to 7 mm, an overflow warning at the overflow outlet is issued; if the rainfall is greater than or equal to 10 mm, a sewage treatment plant crossing warning is issued.

[0131] (2) When the predicted rainfall is greater than 10 m, a water quality exceeding standard warning is issued.

[0132] (3) Warning river sections: MR1, MR2, MR3, MR4.

[0133] (4) Water quality deterioration warning: Based on the COD index of the real-time monitoring data of the automatic monitoring station, when COD ≥ 40 mg / L and the duration exceeds 2 h, a water quality deterioration warning is issued; when COD < 40 mg / L and the duration exceeds 2 h, the warning is lifted.

[0134] (5) Dead fish warning: When the minimum value of dissolved oxygen < 2 mg / L, ammonia nitrogen > 2 mg / L, and the duration exceeds 6 hours, a dead fish warning is issued.

[0135] In this embodiment, a risk warning-based urban river water environment management system during the flood season is also provided. This system is used to implement the above-mentioned embodiments and preferred implementation manners, and those that have been described will not be repeated. As used hereinafter, the term "module" can be a combination of software and / or hardware that can achieve a predetermined function. Although the systems described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0136] This embodiment provides a risk warning-based urban river water environment management system during the flood season, as Figure 8 shown, including:

[0137] A rainfall warning threshold determination module 801, configured to obtain historical monitoring data of the target river and determine the rainfall warning threshold based on the analysis of the historical monitoring data.

[0138] A pre-rain warning module 802, configured to obtain the predicted rainfall and perform pre-rain warning based on the predicted rainfall and the rainfall warning threshold.

[0139] A real-time warning module 803, configured to obtain the real-time water quality index values of multiple water quality monitoring points in real time during the rainfall process, and perform real-time warning on each water quality monitoring point based on the real-time water quality index values and the water quality deterioration standard.

[0140] In some optional embodiments, the rainfall warning threshold determination module 801 includes:

[0141] A relationship analysis unit, configured to analyze the relationships among the overflows at the overflow outlets, the bypasses of the sewage treatment plants, the water quality of the river channels, and the rainfall based on historical monitoring data.

[0142] A warning threshold determination unit, configured to determine a first rainfall warning threshold according to the relationship between the overflow at the overflow outlet and the rainfall, determine a second rainfall warning threshold according to the relationship between the bypass of the sewage treatment plant and the rainfall, and determine a third rainfall warning threshold according to the relationship between the water quality of the river channel and the rainfall.

[0143] A rainfall warning threshold determination unit, configured to compare the first rainfall warning threshold, the second rainfall warning threshold, and the third rainfall warning threshold, and determine the rainfall warning threshold according to the comparison result.

[0144] In some optional embodiments, the warning threshold determination unit includes:

[0145] An overflow rainfall acquisition subunit for a single rainfall event, configured to acquire the overflow rainfall when an overflow occurs at the target overflow outlet during multiple rainfall events.

[0146] A target overflow threshold determination subunit, configured to construct a box plot of the target overflow outlet based on the overflow rainfall and determine the overflow threshold of the target overflow outlet according to the box plot.

[0147] A first rainfall warning threshold determination subunit, configured to acquire the overflow thresholds of multiple target overflow outlets, compare the magnitudes of the overflow thresholds, and take the minimum overflow threshold as the first rainfall warning threshold.

[0148] A bypass rainfall acquisition subunit for a single rainfall event, configured to acquire the bypass rainfall when a bypass occurs at the target sewage treatment plant during multiple rainfall events.

[0149] A bypass threshold determination subunit, configured to construct a box plot of the target sewage treatment plant based on the bypass rainfall and determine the bypass threshold of the target sewage treatment plant according to the box plot.

[0150] A second rainfall warning threshold determination subunit, configured to acquire the bypass thresholds of multiple target sewage treatment plants, compare the magnitudes of the bypass thresholds, and take the minimum bypass threshold as the second rainfall warning threshold.

[0151] A river channel water quality map drawing subunit, configured to acquire the average rainfall of multiple rainfall events and draw a corresponding river channel water quality map according to the rainfall events.

[0152] A threshold marking subunit, configured to determine the preset index thresholds corresponding to each water quality index according to the water quality deterioration standard and mark the preset index thresholds on the river channel water quality map.

[0153] The third rainfall warning threshold determination subunit is used to determine the maximum rainfall for which the river water quality does not exceed the standard based on the marked river water quality map as the third rainfall warning threshold.

[0154] In some optional implementations, the pre-rain warning module 802 includes:

[0155] The no-warning determination unit is used to determine if there is no warning if the forecast rainfall is less than a first rainfall warning threshold.

[0156] The overflow outlet overflow warning unit is used to issue an overflow outlet overflow warning if the forecast rainfall is not less than the first rainfall warning threshold and the forecast rainfall is not greater than the second rainfall warning threshold.

[0157] The sewage treatment plant crossing warning unit is used to issue a sewage treatment plant crossing warning if the forecast rainfall is not less than the second rainfall warning threshold and the forecast rainfall is not greater than the third rainfall warning threshold.

[0158] The water quality exceeding standard warning unit is used to issue a water quality exceeding standard warning if the forecast rainfall is greater than the third rainfall warning threshold.

[0159] In some optional implementations, the real-time warning module 803 includes:

[0160] The first timing unit is used to start timing when the real-time water quality index value is not less than the preset index threshold, and record a first duration during which the real-time water quality index value is not less than the preset index threshold.

[0161] The water quality deterioration warning issuing unit is configured to issue a water quality deterioration warning if the first duration is greater than a first preset time threshold.

[0162] The second timing unit is used to start timing when the real-time water quality index value is less than the preset index threshold, and record a second duration of time when the real-time water quality index value is less than the preset index threshold.

[0163] The water quality deterioration warning cancellation unit is used to cancel the water quality deterioration warning if the second duration is greater than the first preset time threshold.

[0164] The water quality index value acquisition unit is used to obtain the real-time dissolved oxygen content and real-time ammonia nitrogen content of multiple water quality monitoring points in real time during rainfall.

[0165] The third timing unit is used to start timing when the real-time dissolved oxygen content is less than a preset dissolved oxygen content threshold and the real-time ammonia nitrogen content is greater than a preset ammonia nitrogen content threshold to obtain a third duration.

[0166] The dead fish warning issuing unit is configured to issue a dead fish warning if the third duration is greater than a second preset time threshold.

[0167] The further function descriptions of each of the above modules and units are the same as those in the corresponding above embodiments, and will not be elaborated here.

[0168] The flood season urban river water environment management system based on risk warning in this embodiment is presented in the form of functional units. Here, the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and a memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0169] An embodiment of the present invention further provides a computer device having the above Figure 8 shown flood season urban river water environment management system based on risk warning.

[0170] Please refer to Figure 9 , Figure 9 which is a schematic structural diagram of a computer device provided by an optional embodiment of the present invention. As Figure 9 shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting each component, including a high-speed interface and a low-speed interface. Each component communicates with each other using different buses and can be installed on a common motherboard or installed in other ways as needed. The processor can process instructions executed within the computer device, including instructions stored in the memory or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional implementation manners, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a set of blade servers, or a multi-processor system). Figure 9 Taking one processor 10 as an example in

[0171] The processor 10 can be a central processing unit, a network processor or a combination thereof. Among them, the processor 10 can further include a hardware chip. The above hardware chip can be an application specific integrated circuit, a programmable logic device or a combination thereof. The above programmable logic device can be a complex programmable logic device, a field programmable gate array, a generic array logic or any combination thereof.

[0172] Among them, the memory 20 stores instructions executable by at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiments.

[0173] The memory 20 may include a program storage area and a data storage area. Among them, the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some alternative embodiments, the memory 20 may optionally include a memory remotely provided with respect to the processor 10, and these remote memories may be connected to the computer device through a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0174] The memory 20 may include a volatile memory, for example, a random access memory; the memory may also include a non-volatile memory, for example, a flash memory, a hard disk, or a solid-state drive; the memory 20 may further include a combination of the above types of memories.

[0175] The computer device further includes a communication interface 30 for communicating the computer device with other devices or a communication network.

[0176] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A flood season urban river water environment management method based on risk warning, characterized by: The method comprises: Obtaining historical monitoring data of the target river, and determining a rainfall warning threshold based on analysis of the historical monitoring data; Obtaining forecast rainfall, and performing a pre-rainfall warning based on the forecast rainfall and the rainfall warning threshold; During rainfall, real-time water quality index values of multiple water quality monitoring points are obtained in real time, and real-time warnings are issued to each water quality monitoring point based on the real-time water quality index values and water quality deterioration standards.

2. The method according to claim 1, characterized in that Determining a rainfall warning threshold based on analysis of the historical monitoring data includes: Analyze the relationship between overflow outlets, sewage treatment plant overruns, river water quality, and rainfall based on the historical monitoring data; Determine a first rainfall warning threshold based on the relationship between the overflow of the overflow port and rainfall, determine a second rainfall warning threshold based on the relationship between the sewage treatment plant crossing and rainfall, and determine a third rainfall warning threshold based on the relationship between the river water quality and rainfall; The first rainfall warning threshold, the second rainfall warning threshold, and the third rainfall warning threshold are compared, and the rainfall warning threshold is determined according to the comparison result.

3. The method according to claim 2, characterized in that The determining of the first rainfall warning threshold according to the relationship between the overflow of the overflow port and the rainfall includes: Obtain overflow rainfall when overflow occurs at the target overflow outlet during multiple rainfall events; constructing an overflow box diagram of a target overflow port based on the overflow rainfall, and determining an overflow threshold of the target overflow port according to the overflow box diagram; The overflow thresholds of multiple target overflow outlets are obtained, and the sizes of the overflow thresholds are compared, and the smallest overflow threshold is taken as the first rainfall warning threshold.

4. The method according to claim 2, characterized in that Determining a second rainfall warning threshold according to the relationship between the sewage treatment plant span and rainfall includes: Obtain the amount of rainfall when sewage crossover occurs at the target sewage treatment plant during multiple rainfall events; Constructing a crossover box plot of the target sewage treatment plant based on the crossover rainfall, and determining a crossover threshold of the target sewage treatment plant according to the crossover box plot; Obtain the crossing thresholds of multiple target sewage treatment plants, compare the sizes of the crossing thresholds, and take the smallest crossing threshold as the second rainfall warning threshold.

5. The method according to claim 2, characterized in that Determining a third rainfall warning threshold according to the relationship between the river water quality and rainfall includes: Obtain the average rainfall value of multiple rainfall events and draw corresponding river water quality maps based on the rainfall events; Determine preset indicator thresholds corresponding to various water quality indicators according to the water quality deterioration standard, and mark the preset indicator thresholds on the river water quality map; Based on the annotated river water quality map, the maximum rainfall at which the river water quality does not exceed the standard is determined as the third rainfall warning threshold.

6. The method according to claim 2, characterized in that Providing a pre-rainfall warning based on the forecast rainfall and the rainfall warning threshold includes: If the forecast rainfall is less than the first rainfall warning threshold, no warning is issued; If the forecast rainfall is not less than the first rainfall warning threshold, and the forecast rainfall is not greater than the second rainfall warning threshold, issuing an overflow warning; If the forecast rainfall is not less than the second rainfall warning threshold, and the forecast rainfall is not greater than the third rainfall warning threshold, issuing a sewage treatment plant overrun warning; If the forecast rainfall is greater than the third rainfall warning threshold, a water quality exceeding standard warning is issued.

7. The method according to claim 1, characterized in that Based on the real-time water quality index value and water quality deterioration standard, a real-time early warning is provided to each water quality monitoring point, including: When the real-time water quality index value is not less than the preset index threshold, start timing and record the first duration when the real-time water quality index value is not less than the preset index threshold; If the first duration is greater than a first preset time threshold, issuing a water quality deterioration warning; When the real-time water quality index value is less than the preset index threshold, start timing and record a second duration when the real-time water quality index value is less than the preset index threshold; If the second duration is greater than the first preset time threshold, the water quality deterioration warning is cancelled.

8. The method according to claim 1, characterized in that The water quality index values include dissolved oxygen content and ammonia nitrogen content. Based on the real-time water quality index values and water quality deterioration standards, a real-time early warning is provided to each water quality monitoring point. The following also includes: During rainfall, the real-time dissolved oxygen content and real-time ammonia nitrogen content of multiple water quality monitoring points are obtained in real time; When the real-time dissolved oxygen content is less than the preset dissolved oxygen content threshold, and the real-time ammonia nitrogen content is greater than the preset ammonia nitrogen content threshold, start timing to obtain a third duration; If the third duration is greater than the second preset time threshold, a dead fish warning is issued.

9. A flood season urban river water environment management system based on risk warning, characterized by: The system comprises: A rainfall warning threshold determination module is used to obtain historical monitoring data of the target river channel and determine the rainfall warning threshold based on the analysis of the historical monitoring data; A pre-rainfall warning module is used to obtain the forecast rainfall and perform a pre-rainfall warning based on the forecast rainfall and the rainfall warning threshold; The real-time warning module is used to obtain the real-time water quality index values of multiple water quality monitoring points in real time during rainfall, and to issue real-time warnings to each water quality monitoring point based on the real-time water quality index values and water quality deterioration standards.

10. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method according to any one of claims 1 to 8 by executing the computer instructions.

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