Ecological flow determination method, system, device and medium based on suitable living area of aquatic organisms

Abstract

This invention discloses a method, system, equipment, and storage medium for determining ecological flow based on the suitable living area of ​​aquatic organisms. The method includes: dividing the river into high-water, normal, and low-water years; determining ecological protection targets for high-water, normal, and low-water years based on the suitable living conditions of dominant aquatic organism populations in the river channel; calculating the size of the suitable living area of ​​dominant aquatic organism populations in the river section under different water levels or wetted perimeters based on the ecological protection targets and hydraulic formulas; plotting the change curve of the suitable living area of ​​dominant aquatic organism populations in the river section under different water levels; and determining the river ecological flow in combination with the ecological protection targets for high-water, normal, and low-water years. This invention uses the suitable living area of ​​dominant aquatic organism populations in the river section as a label to deduce the river ecological flow target. Compared with previous methods, this method more fully considers the suitable living space of dominant aquatic organism populations in the river channel, and the determined ecological flow target is more suitable for the survival of aquatic organisms in the river channel.

Description

Technical Field

[0001] This invention belongs to the technical field of ecological flow determination, specifically relating to a method, system, equipment, and medium for determining ecological flow based on the suitable living area for aquatic organisms. Background Technology

[0002] Ecological flow refers to the flow or process retained in rivers to maintain the structure and function of the river aquatic ecosystem. Currently, methods for calculating ecological flow can be broadly categorized into four types: hydrological methods, hydraulic methods, habitat simulation methods, and holistic methods. Among these four types, hydrological and hydraulic methods are widely used, while habitat simulation and holistic methods are less frequently applied in practice due to the numerous ecological factors involved, the large data requirements, and the cumbersome calculation processes. Common hydrological methods include the Tennant method (Montana method), the Qp method, the flow duration curve method, the 7Q10 method, and the average flow of the driest month over the past 10 years; common hydraulic methods include the wetted perimeter method and the R2-CROSS method.

[0003] Hydrological methods, based on long-term hydrological data, comprehensively consider river flow variations and ecological environment conditions to deduce ecological flow or its processes. However, they neglect the relationship between river hydraulic characteristics, aquatic organisms, and these variations in flow. Hydraulic methods calculate river ecological flow using river cross-sections and hydraulic parameters, without considering flow variations. Currently, few current hydrological and hydraulic methods take into account both flow variations, river hydraulic characteristics, and aquatic organisms. Furthermore, most hydraulic methods (including the ecological hydraulic radius method, the R2-CROSS method, and the wetted perimeter method) aim to determine ecological flow by setting cross-sectional water level, flow velocity, wetted perimeter, and hydraulic radius to meet suitable conditions for aquatic organism survival. This fails to adequately consider the suitable living area for aquatic organisms under specific water level conditions, resulting in a low degree of alignment between the determined ecological flow and the survival needs of aquatic organisms. Summary of the Invention

[0004] The main objective of this invention is to overcome the shortcomings and deficiencies of the prior art and provide a method, system, device, and medium for determining ecological flow based on the suitable living area of ​​aquatic organisms. This invention can determine the size of the suitable living area of ​​dominant aquatic organism populations in a river section at different water levels, and then determine the ecological flow based on the relationship between the suitable living areas of dominant aquatic organism populations in a river section at different water levels and the characteristics of river flow changes. The invention reveals the significance of the size of ecological flow for the survival of aquatic organisms in the river.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a method for determining ecological flow based on the suitable living area for aquatic organisms, comprising the following steps:

[0007] Based on historical hydrological data, years are classified as high-water, normal-water, and low-water years.

[0008] Based on the suitable living conditions of the dominant aquatic species in the river channel, ecological protection targets for high, normal, and low water years are determined;

[0009] Based on the ecological protection goals for high, normal, and low water years, and combined with the hydraulic parameters and hydraulic formulas of the river section, the size of the suitable living area for dominant aquatic species in the river section under different water levels or wet perimeters is calculated.

[0010] Plot curves showing the changes in the suitable habitat area of ​​dominant aquatic organisms in the river cross-section under different water levels, and determine the ecological flow of the river in conjunction with the ecological protection targets for high, normal, and low water years.

[0011] As a preferred technical solution, the method for dividing years into abundant, normal, and dry seasons is as follows:

[0012] The percentage anomaly method is used to classify years within a hydrological series into high-water, normal, and low-water years. The formula for the percentage anomaly method is as follows:

[0013] ;

[0014] Where E is the percentage of anomaly; Q i The average runoff in year i is expressed in m³. 3 / s; The average runoff over many years, in cubic meters (m³). 3 / s.

[0015] As a preferred technical solution, the percentage of anomalies E in the wet year is greater than 20%, the absolute value of the percentage of anomalies E in the normal year is less than 20%, and the percentage of anomalies E in the dry year is less than -20%.

[0016] As a preferred technical solution, the ecological protection targets for abundant, normal, and dry years are specifically as follows:

[0017] The ecological protection target for dry years is set as the maximum water depth in the river channel reaching the range suitable for the survival of dominant aquatic organisms.

[0018] The ecological protection goals for dry seasons in normal and wet years are to ensure that the maximum water depth in the river channel reaches the range suitable for the survival of dominant aquatic organisms, while the ecological protection goals for wet seasons are to ensure that the river channel cross-section is suitable for the survival area of ​​dominant aquatic organism populations.

[0019] As a preferred technical solution, the calculation of the suitable survival area of ​​dominant aquatic organisms in the river cross-section under different water levels or wetted perimeters specifically involves:

[0020] The cross-sectional shape of the flow under different water levels was drawn using CAD, and the cross-sectional area and wetted perimeter of the flow under different water levels were measured. Then, the hydraulic radius of the flow section under different water levels was calculated according to the hydraulic radius formula.

[0021] The Chezy coefficient is calculated based on Manning's formula and measured river roughness and river gradient. Then, the flow velocity and flow rate at different water levels are calculated based on the Chezy formula.

[0022] Based on the flow velocity of the river cross section corresponding to different water levels, and combined with the suitable flow velocity range for the survival of dominant aquatic organisms, the water level suitable for the survival of dominant aquatic organisms is determined.

[0023] Based on the suitable water depth range for dominant aquatic organisms, and combined with the measured cross-sectional shape of the river channel and the suitable water level for dominant aquatic organisms, CAD software was used to draw the suitable survival area of ​​the river channel cross-section at different water levels.

[0024] As a preferred technical solution, the formula for calculating the hydraulic radius is as follows:

[0025] ;

[0026] Where R is the hydraulic radius, in meters (m); and A is the cross-sectional area of ​​the river channel, in square meters (m²). 2 x represents the wetted perimeter at a specific water level, in meters (m).

[0027] The Xie Cai formula is as follows:

[0028] ;

[0029] Where v is the cross-sectional velocity, in meters per second (m). 3 / s; C is the Chezy coefficient; R is the hydraulic radius in meters; J is the channel gradient;

[0030] The simplest and most widely used formula for the Chezy coefficient is the Manning formula, which is as follows:

[0031] ;

[0032] Where n is the channel roughness;

[0033] The formula for calculating flow rate is as follows:

[0034] ;

[0035] Where Q is the cross-sectional flow rate of the river, in cubic meters per second (m³). 3 / s.

[0036] As a preferred technical solution, the step of plotting the change curves of the suitable dominant aquatic organism population survival area in the river cross-section under different water levels, and comprehensively determining the river ecological flow in conjunction with the ecological protection targets for wet, normal, and dry years, specifically involves:

[0037] The suitable habitat area of ​​dominant aquatic organisms in the river section under different water levels was statistically analyzed, and the variation curve of suitable habitat area of ​​dominant aquatic organisms in the river section under different water levels was plotted.

[0038] Based on the ecological protection targets for high, normal, and low water years and the change curves of the suitable dominant aquatic organism population survival area in the river section under different water levels, the target value of river ecological flow is determined.

[0039] Secondly, the present invention also provides an ecological flow determination system based on the suitable living area of ​​aquatic organisms, which is applied to the ecological flow determination method based on the suitable living area of ​​aquatic organisms, including a wet and dry year division module, an ecological protection target determination module, a living area calculation module, and an ecological flow determination module.

[0040] The flood and drought year classification module is used to classify flood, normal, and dry years based on historical hydrological data.

[0041] The ecological protection target determination module is used to determine the ecological protection targets for high, normal, and low water years based on the suitable living conditions of the dominant aquatic organisms in the river.

[0042] The survival area calculation module is used to calculate the size of the suitable survival area of ​​dominant aquatic organisms in the river section under different water levels or wet perimeters, based on the ecological protection goals of high, normal and low water years, combined with the hydraulic parameters and hydraulic formulas of the river section.

[0043] The ecological flow determination module is used to plot the change curve of the suitable dominant aquatic organism population survival area in the river section under different water levels, and to determine the river ecological flow in combination with the ecological protection targets for high, normal and low water years.

[0044] Thirdly, the present invention also provides an electronic device, the electronic device comprising:

[0045] At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores computer program instructions executable by the at least one processor, the computer program instructions being executed by the at least one processor to enable the at least one processor to perform the ecological flow determination method based on suitable living area for aquatic organisms.

[0046] Fourthly, the present invention also provides a computer-readable storage medium storing a program, characterized in that, when the program is executed by a processor, it implements the method for determining ecological flow based on suitable living area for aquatic organisms.

[0047] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0048] (1) The present invention provides a method for determining ecological flow based on the suitable living area of ​​aquatic organisms in a river section, comprising: dividing the river into high-water, normal, and low-water years based on historical hydrological data; determining the ecological protection targets for high-water, normal, and low-water years according to the suitable living conditions of dominant aquatic organism populations in the river; calculating the size of the suitable living area of ​​dominant aquatic organism populations in the river section at different water levels based on the ecological protection targets for high-water, normal, and low-water years, combined with the hydraulic parameters and hydraulic formulas of the river section; plotting the curves showing the changes in the suitable living area of ​​dominant aquatic organism populations in the river section at different water levels, and determining the river ecological flow based on the ecological protection targets for high-water, normal, and low-water years. The method of the present invention uses the suitable living area of ​​dominant aquatic organism populations in the river section as a label to deduce the river ecological flow target. Compared with previous methods, it more fully considers the living space of suitable dominant aquatic organism populations in the river, and the determined ecological flow target is more suitable for the survival of aquatic organisms in the river.

[0049] (2) The present invention is based on the ecological flow determination method of suitable aquatic organism living area of ​​river cross section. Based on the hydraulic characteristics of river cross section and hydrological series data, the ecological protection targets of river cross section in high, normal and low water years are determined respectively, taking into account the changes in river flow and river hydraulic characteristics. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a flowchart of an embodiment of the present invention for determining ecological flow based on suitable living area for aquatic organisms;

[0052] Figure 2 This is a graph showing the change in the suitable survival area of ​​dominant aquatic organisms in a river section under different water levels in an embodiment of the present invention.

[0053] Figure 3 This is a block diagram of an ecological flow determination system based on suitable living area for aquatic organisms, according to an embodiment of the present invention.

[0054] Figure 4This is a structural diagram of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0055] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0056] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0057] Currently available methods for calculating ecological flow, such as habitat simulation and holistic methods, are overly complex, requiring extensive data and involving cumbersome calculations, making them difficult to apply in practical production. Hydrological and hydraulic methods consider only a single factor, failing to take into account both river flow variations and hydraulic characteristics. Furthermore, existing hydraulic methods only consider factors such as cross-sectional water level, flow velocity, wetted perimeter, and hydraulic radius to determine suitable conditions for aquatic life, neglecting the size of the suitable living space for aquatic organisms within the river channel. Based on this, this embodiment discloses a method for determining ecological flow based on the suitable living area of ​​aquatic organisms in a river cross-section. This method uses historical hydrological data to divide the river into high-water, normal, and low-water years, and determines the ecological protection targets for these years based on the suitable living conditions of dominant aquatic organism populations within the river channel. Furthermore, by combining the hydraulic parameters and hydraulic formulas of the river cross-section, the method calculates the suitable living area of ​​dominant aquatic organism populations at different water levels and plots the curves showing the changes in the suitable living area of ​​dominant aquatic organism populations in the river cross-section. Finally, based on the ecological protection targets for high-water, normal, and low-water years, the method comprehensively determines the river's ecological flow, which is more conducive to the survival and reproduction of aquatic organisms within the river channel.

[0058] For ease of understanding of this embodiment, please refer to... Figure 1 The flowchart shown is a method for determining ecological flow based on the suitable aquatic organism habitat area of ​​a river cross-section, including the following steps:

[0059] S1. Based on the historical flow series of the river channel, the years are divided into high-water, normal-water, and low-water years.

[0060] In this example, a 20-year historical flow series of the river is selected. The length of the selected historical flow series is not limited to 20 years, but should be no less than 20 years if possible. The years within the historical flow series are divided into high-water, normal-water, and low-water years according to the anomaly percentage method.

[0061] Furthermore, the specific method for classifying years as abundant, normal, and dry is as follows:

[0062] The percentage anomaly method is used to classify years within a hydrological series into high-water, normal, and low-water years. The formula for the percentage anomaly method is as follows:

[0063] ;

[0064] Where E is the percentage of anomaly; Q i The average runoff in year i is expressed in m³. 3 / s; The average runoff over many years, in cubic meters (m³). 3 / s.

[0065] In one embodiment, the percentage of anomalies E in a wet year is greater than 20%, the absolute value of the percentage of anomalies E in a normal year is less than 20%, and the percentage of anomalies E in a dry year is less than -20%.

[0066] It is understood that comparing the above-mentioned anomaly percentage E with 20% is one implementation method of this embodiment, and this value can be adjusted according to the actual situation.

[0067] S2. Based on the suitable living conditions of the dominant aquatic species in the river channel, determine the ecological protection targets for high, normal, and low water years.

[0068] In this example, carp was selected as the dominant aquatic species in the river channel. Its suitable water depth range is 1–1.5 m, and its suitable flow velocity range is 0.3–0.9 m / s. The ecological protection target for dry years is to ensure that the maximum water depth in the river channel reaches the suitable range for carp survival. For normal and wet years, the ecological protection target during the dry season (October to March of the following year) is also to ensure that the maximum water depth in the river channel reaches the suitable range for carp survival. During the wet season (April to September), the ecological protection target is to determine the suitable area of ​​the river cross-section for the dominant aquatic species to survive.

[0069] S3. For ecological protection goals during high, normal, and low water years, and considering hydraulic parameters such as river cross-sectional area, river roughness, and river gradient, the hydraulic radius, flow velocity, and flow rate at different water levels are calculated using formulas for hydraulic radius, Chezy formula, Manning formula, and flow rate calculation. Then, based on the suitable survival conditions for dominant aquatic species and the river cross-section, the suitable survival area for dominant aquatic species at different water levels is determined.

[0070] Furthermore, step S3 specifically includes:

[0071] S31. Based on the measured cross-sectional data of the river channel, determine the range of water levels for calculation. In this example, the elevation of the left bank of the river is 179.645m, the elevation of the right bank is 180.425m, and the elevation of the riverbed is 165.345m. The elevation difference between the left bank and the riverbed is 14.30m, and the elevation difference between the right bank and the riverbed is 15.08m. Therefore, the range of water levels for calculation is determined to be 0~15m, with a step size of 0.3m, and a total of 50 water levels are calculated.

[0072] S32. Based on the measured cross-sectional shape of the river channel, the cross-sectional shape of the flow under different water levels is drawn using CAD, and the cross-sectional area and wetted perimeter of the flow under different water levels are measured. Then, the hydraulic radius of the flow section under different water levels is calculated according to the hydraulic radius formula.

[0073] Furthermore, the formula for calculating the hydraulic radius is as follows:

[0074] ;

[0075] Where R is the hydraulic radius, in meters (m); and A is the cross-sectional area of ​​the river channel, in square meters (m²). 2 x represents the wetted perimeter at a specific water level, in meters (m).

[0076] S33. Calculate the Chezy coefficient based on Manning's formula and the measured channel roughness and river gradient. Then, calculate the flow velocity and discharge at different water levels using the Chezy formula. In this example, the measured channel roughness is 0.32, and the river gradient is 0.523%. Based on this, the Chezy coefficient and the flow velocity and discharge at different water levels are calculated.

[0077] Furthermore, the Cheze formula is as follows:

[0078] ;

[0079] Where v is the cross-sectional velocity, in meters per second (m). 3 / s; C is the Chezy coefficient; R is the hydraulic radius in meters; J is the channel gradient in per mille.

[0080] The simplest and most widely used formula for the Chezy coefficient is the Manning formula, which is as follows:

[0081] ;

[0082] Where n is the river channel roughness.

[0083] The formula for calculating flow rate is as follows:

[0084] ;

[0085] Where Q is the cross-sectional flow rate of the river, m 3 / s;

[0086] S34. Based on the flow velocity of the river cross section corresponding to different water levels, and combined with the suitable flow velocity range for the survival of dominant aquatic organisms, determine the water level suitable for the survival of dominant aquatic organisms.

[0087] S35. Based on the suitable water depth range for dominant aquatic organisms, and combined with the measured cross-sectional shape of the river channel and the water level suitable for the survival of dominant aquatic organisms, use CAD software to draw the suitable survival area of ​​dominant aquatic organisms in the river channel cross-section at different water levels.

[0088] S4. Plot the curves showing the changes in the suitable habitat area of ​​dominant aquatic organisms in the river section under different water levels, and determine the ecological flow of the river in conjunction with the ecological protection targets for high, normal, and low water years.

[0089] Furthermore, step S4 specifically involves:

[0090] S41. Statistically determine the suitable habitat area of ​​dominant aquatic organisms in river sections under different water levels, and plot the variation curve of suitable habitat area of ​​dominant aquatic organisms in river sections under different water levels.

[0091] S42. Based on the ecological protection targets for high, normal, and low water years and the change curves of the suitable dominant aquatic organism population survival area in the river section under different water levels, determine the target value of the river ecological flow. Figure 2 This is a graph showing the change in the suitable habitat area of ​​dominant aquatic organisms at different water levels in a river section according to one embodiment of the present invention.

[0092] It is understandable that, in this embodiment, the determination of the suitable survival area of ​​dominant aquatic organisms at different water levels first involves determining the water level range to be calculated; then, based on the water level, calculating the hydraulic radius, flow velocity, and flow rate at different water levels; subsequently, determining the suitable survival water level range based on the suitable survival flow velocity of the dominant aquatic organisms; and finally, determining the size of the suitable survival area of ​​the dominant aquatic organisms at a specific water level in the river section based on the suitable survival water depth of the dominant aquatic organisms.

[0093] It should be noted that, for the sake of simplicity, the aforementioned method embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously.

[0094] Based on the same idea as the ecological flow determination method based on the suitable living area of ​​aquatic organisms in the above embodiments, the present invention also provides an ecological flow determination system based on the suitable living area of ​​aquatic organisms. This system can be used to execute the above-described ecological flow determination method based on the suitable living area of ​​aquatic organisms. For ease of explanation, the structural schematic diagram of the embodiment of the ecological flow determination system based on the suitable living area of ​​aquatic organisms only shows the parts related to the embodiments of the present invention. Those skilled in the art will understand that the illustrated structure does not constitute a limitation on the device, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0095] Please see Figure 3 In another embodiment of this application, an ecological flow determination system 100 based on the suitable living area of ​​aquatic organisms is provided. The system includes a wet and dry year division module 101, an ecological protection target determination module 102, a living area calculation module 103, and an ecological flow determination module 104.

[0096] The flood and drought year classification module 101 is used to classify flood, normal, and dry years based on historical hydrological data.

[0097] The ecological protection target determination module 102 is used to determine the ecological protection targets for high, normal, and low water years based on the suitable living conditions of the dominant aquatic organisms in the river.

[0098] The survival area calculation module 103 is used to calculate the size of the suitable survival area of ​​dominant aquatic organisms in the river section under different water levels or wet perimeters, based on the ecological protection goals of high, normal and low water years, combined with the hydraulic parameters and hydraulic formulas of the river section.

[0099] The ecological flow determination module 104 is used to plot the change curve of the suitable dominant aquatic organism population survival area in the river section under different water levels, and to comprehensively determine the river ecological flow in combination with the ecological protection targets of high, normal and low water years.

[0100] It should be noted that the ecological flow determination system based on the suitable living area of ​​aquatic organisms of the present invention corresponds one-to-one with the ecological flow determination method based on the suitable living area of ​​aquatic organisms of the present invention. The technical features and beneficial effects described in the above embodiments of the ecological flow determination method based on the suitable living area of ​​aquatic organisms are applicable to the embodiments of the ecological flow determination method based on the suitable living area of ​​aquatic organisms. For details, please refer to the description in the embodiments of the method of the present invention, which will not be repeated here.

[0101] Furthermore, in the above embodiments of the ecological flow determination system based on suitable living area of ​​aquatic organisms, the logical division of each program module is only an example. In actual applications, the above functions can be assigned to different program modules as needed, for example, for the sake of corresponding hardware configuration requirements or software implementation convenience. That is, the internal structure of the ecological flow determination system based on suitable living area of ​​aquatic organisms is divided into different program modules to complete all or part of the functions described above.

[0102] Please see Figure 4 In one embodiment, an electronic device is provided for implementing an ecological flow determination method based on the suitable living area of ​​aquatic organisms. The electronic device 200 may include a first processor 201, a first memory 202 and a bus, and may also include a computer program stored in the first memory 202 and executable on the first processor 201, such as an ecological flow determination program 203 based on the suitable living area of ​​aquatic organisms.

[0103] The first memory 202 includes at least one type of readable storage medium, including flash memory, portable hard drive, multimedia card, card-type memory (e.g., SD or DX memory), magnetic memory, magnetic disk, optical disk, etc. In some embodiments, the first memory 202 can be an internal storage unit of the electronic device 200, such as the portable hard drive of the electronic device 200. In other embodiments, the first memory 202 can also be an external storage device of the electronic device 200, such as a plug-in portable hard drive, smart media card (SMC), secure digital card (SD), flash card, etc., equipped on the electronic device 200. Furthermore, the first memory 202 can include both internal and external storage units of the electronic device 200. The first memory 202 can be used not only to store application software and various types of data installed on the electronic device 200, such as the code of the ecological flow determination program 203 based on the suitable habitat area for aquatic organisms, but also to temporarily store data that has been output or will be output.

[0104] In some embodiments, the first processor 201 may be composed of integrated circuits, such as a single packaged integrated circuit or multiple integrated circuits with the same or different functions, including combinations of one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and various control chips. The first processor 201 is the control unit of the electronic device, connecting various components of the entire electronic device through various interfaces and lines. It executes programs or modules stored in the first memory 202 and calls data stored in the first memory 202 to perform various functions of the electronic device 200 and process data.

[0105] Figure 4 Only electronic devices with components are shown; it will be understood by those skilled in the art that... Figure 4 The structure shown does not constitute a limitation on the electronic device 200, and may include fewer or more components than shown, or combine certain components, or have different component arrangements.

[0106] The ecological flow determination program 203 based on the suitable living area for aquatic organisms, stored in the first memory 202 of the electronic device 200, is a combination of multiple instructions. When run in the first processor 201, it can achieve the following:

[0107] Based on historical hydrological data, years are classified as high-water, normal-water, and low-water years.

[0108] Based on the suitable living conditions of the dominant aquatic species in the river channel, ecological protection targets for high, normal, and low water years are determined;

[0109] Based on the ecological protection goals for high, normal, and low water years, and combined with the hydraulic parameters and hydraulic formulas of the river section, the size of the suitable living area for dominant aquatic species in the river section under different water levels or wet perimeters is calculated.

[0110] Plot the change curves of the suitable survival area of ​​dominant aquatic organisms in the river cross section under different water levels, and comprehensively determine the ecological flow of the river in combination with the ecological protection targets of high, normal and low water years.

[0111] Furthermore, if the modules / units integrated in the electronic device 200 are implemented as software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium. The computer-readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, or a read-only memory (ROM).

[0112] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0113] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0114] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A method for determining ecological flow based on suitable habitat area for aquatic organisms, characterized in that, Includes the following steps: Based on historical hydrological data, years are classified as high-water, normal-water, and low-water years. Based on the suitable living conditions of the dominant aquatic species in the river channel, ecological protection targets for high, normal, and low water years are determined; Based on the ecological protection goals for high, normal, and low water years, and combined with the hydraulic parameters and hydraulic formulas of the river section, the size of the suitable living area for dominant aquatic species in the river section under different water levels or wet perimeters is calculated. Plot the curves showing the changes in the suitable habitat area of ​​dominant aquatic organisms in the river cross-section under different water levels, and determine the ecological flow of the river in combination with the ecological protection targets for high, normal, and low water years. The specific ecological protection targets for abundant, normal, and dry years are as follows: The ecological protection target for dry years is set as the maximum water depth in the river channel reaching the range suitable for the survival of dominant aquatic organisms. During the dry season in normal and wet years, the ecological protection target is to ensure that the maximum water depth in the river channel reaches the range suitable for the survival of dominant aquatic organisms. During the wet season, the ecological protection target is to ensure that the river channel cross-section is suitable for the survival area of ​​dominant aquatic organism populations. The process involves plotting curves showing the changes in the suitable habitat area of ​​dominant aquatic organisms at different water levels, and comprehensively determining the river's ecological flow based on ecological protection targets for wet, normal, and dry years. Specifically: The suitable habitat area of ​​dominant aquatic organisms in the river section under different water levels was statistically analyzed, and the variation curve of suitable habitat area of ​​dominant aquatic organisms in the river section under different water levels was plotted. Based on the ecological protection targets for high, normal, and low water years and the change curves of the suitable dominant aquatic organism population survival area in the river section under different water levels, the target value of river ecological flow is determined.

2. The method for determining ecological flow based on suitable habitat area for aquatic organisms according to claim 1, characterized in that, The specific method for classifying years as abundant, normal, and dry is as follows: The percentage anomaly method is used to classify years within a hydrological series into high-water, normal, and low-water years. The formula for the percentage anomaly method is as follows: ； Where E is the percentage of anomaly; Q i The average runoff in year i is expressed in m³. 3 / s; The average runoff over many years, in cubic meters (m³). 3 / s.

3. The method for determining ecological flow based on suitable habitat area for aquatic organisms according to claim 2, characterized in that, The percentage of anomalies E in a high-water year is greater than 20%, the absolute value of the percentage of anomalies E in a normal-water year is less than 20%, and the percentage of anomalies E in a low-water year is less than -20%.

4. The method for determining ecological flow based on suitable habitat area for aquatic organisms according to claim 1, characterized in that, The calculation of the suitable living area for dominant aquatic organisms in the river cross-section under different water levels or wetted perimeters is specifically as follows: The cross-sectional shape of the flow under different water levels was drawn using CAD, and the cross-sectional area and wetted perimeter of the flow under different water levels were measured. Then, the hydraulic radius of the flow section under different water levels was calculated according to the hydraulic radius formula. The Chezy coefficient is calculated based on Manning's formula and measured river roughness and river gradient. Then, the flow velocity and flow rate at different water levels are calculated based on the Chezy formula. Based on the flow velocity of the river cross section corresponding to different water levels, and combined with the suitable flow velocity range for the survival of dominant aquatic organisms, the water level suitable for the survival of dominant aquatic organisms is determined. Based on the suitable water depth range for dominant aquatic organisms, and combined with the measured cross-sectional shape of the river channel and the suitable water level for dominant aquatic organisms, CAD software was used to draw the suitable survival area of ​​the river channel cross-section at different water levels.

5. The method for determining ecological flow based on suitable habitat area for aquatic organisms according to claim 4, characterized in that, The formula for calculating the hydraulic radius is as follows: ； Where R is the hydraulic radius, in meters (m); and A is the cross-sectional area of ​​the river channel, in square meters (m²). 2 x represents the wetted perimeter at a specific water level, in meters (m). The Xie Cai formula is as follows: ； Where v is the cross-sectional velocity, in meters per second (m). 3 / s; C is the Chezy coefficient; R is the hydraulic radius in meters; J is the channel gradient; The Chezy coefficient is based on the Manning formula, which is as follows: ； Where n is the channel roughness; The formula for calculating flow rate is as follows: ； Where Q is the cross-sectional flow rate of the river, in cubic meters per second (m³). 3 / s.

6. An ecological flow determination system based on suitable habitat area for aquatic organisms, characterized in that, The method for determining ecological flow based on suitable living area for aquatic organisms, as applied in any one of claims 1-5, includes a module for classifying abundant and dry years, a module for determining ecological protection targets, a module for calculating living area, and a module for determining ecological flow. The flood and drought year classification module is used to classify flood, normal, and dry years based on historical hydrological data. The ecological protection target determination module is used to determine the ecological protection targets for high, normal, and low water years based on the suitable living conditions of the dominant aquatic organisms in the river. The survival area calculation module is used to calculate the size of the suitable survival area of ​​dominant aquatic organisms in the river section under different water levels or wet perimeters, based on the ecological protection goals of high, normal and low water years, combined with the hydraulic parameters and hydraulic formulas of the river section. The ecological flow determination module is used to plot the change curve of the suitable dominant aquatic organism population survival area in the river section under different water levels, and to determine the river ecological flow in combination with the ecological protection targets for high, normal and low water years.

7. An electronic device, characterized in that, The electronic device includes: At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores computer program instructions executable by the at least one processor, the computer program instructions being executed by the at least one processor to enable the at least one processor to perform the ecological flow determination method based on suitable living area for aquatic organisms as described in any one of claims 1-5.

8. A computer-readable storage medium storing a program, characterized in that, When the program is executed by the processor, it implements the ecological flow determination method based on the suitable living area of ​​aquatic organisms as described in any one of claims 1-5.

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