An internal circulation method and equipment for hydrodynamic regulation of an "X" type river network

Abstract

The application discloses an X-shaped river network water power regulation internal circulation method and equipment, and belongs to the technical field of river network water power regulation. The method comprises the following steps: determining a main stream river channel in a river network along a water flow direction, obtaining at least one branch stream river channel intersecting the main stream river channel, and defining an intersection point of the main stream river channel and the branch stream river channel as a key node; dividing the river network into at least two regions based on the key node, and constructing a circulating pump station at the key node; sequentially creating and using a single-region circulation mode, a multi-region circulation mode and a full circulation mode; and opening the circulating pump station to supplement water. In the application, the circulating pump station provides power, so that the flow speed of most river channels can be optimized to between 0.05-0.15 m / s, the water body has good flowability, and the water body is maintained in good health.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of river network hydrodynamic regulation, and particularly relates to an X-shaped river network hydrodynamic regulation internal circulation method and equipment. BACKGROUND

[0002] The plain river network hydrodynamic condition is significantly related to the water environment quality. The improvement of the hydrodynamic force can increase the river network water environment capacity, dilute the polluted water body, fully drive the mixing of each layer of water body when the water body flows, promote the degradation of pollutants, and promote the absorption of the nutrient salt by the aquatic plants under the good flow velocity condition.

[0003] Researches have found that in the plain river network area, the terrain is flat, the water body flowability is poor, the self hydrodynamic condition is poor, the self-purification capacity of the water body is poor, the water environment quality is poor, and the ecological and landscape requirements cannot be met. SUMMARY

[0004] The application provides an X-shaped river network hydrodynamic regulation internal circulation method and equipment to solve the above problems.

[0005] The technical scheme is as follows:An X-shaped river network hydrodynamic regulation internal circulation method comprises the following steps:

[0006] A main stream river channel is determined in the river network along the water flow direction, at least one branch stream river channel intersecting the main stream river channel is obtained, and the intersection point of the main stream river channel and the branch stream river channel is defined as a key node;

[0007] The river network is divided into at least two regions based on the key node, and a circulation pump station is constructed at the key node;

[0008] A single-region circulation mode, a multi-region circulation mode, and a full circulation mode are sequentially created and used;

[0009] Based on one of the single-region circulation mode, the multi-region circulation mode, or the full circulation mode, an ecological water supplement amount and a water supplement source are obtained, the circulation pump station is started to supplement water and form water body flow circulation.

[0010] In a further embodiment, the construction of the circulation pump station comprises the following construction process: setting pumps B1, B2, B3, …, Bi, steel dam gates G1, G2, G3, …, Gj, and gate Z1, Z2, Z3, …, Zm, wherein i is the number of pumps, i>=3, j is the number of steel dam gates, and m is the number of gates. i j m

[0011] ​​The steel dam gate position is arranged at a key node for controlling the flow path between the main stream river channel and the branch river channel to obtain a predetermined shape flow path; based on the predetermined shape flow path, the position of the gate is arranged to realize corresponding reverse water inflow and outflow on both sides of the steel dam gate.

[0012] In a further embodiment, the creation of the single-zone circulation mode includes the following process: setting the highest development and construction degree of the sub-area as the starting zone, starting 2-i pumps, and supplementing all ecological water to the starting zone; the steel dam gates are all erected to completely separate the river channel of the starting zone from other sub-areas; part of the gates are opened and the remaining gates are closed to make the river system only circulate in the starting zone.

[0013] In a further embodiment, the creation of the multi-zone circulation mode includes the following process: starting 3-i pumps, and supplementing ecological water to the corresponding sub-area; the steel dam gates are all erected to completely separate the river channel of the corresponding sub-area; part of the gates are opened and the remaining gates are closed to make the river system separately circulate in each sub-area.

[0014] In a further embodiment, the creation of the full circulation mode includes the following process: starting 3-i pumps, and supplementing ecological water to all sub-areas; part of the steel dam gates are erected and the remaining steel dam gates are laid down to make at least two sub-area river channels connected, part of the gates are opened and the remaining gates are closed to regulate the river system to form a large circulation.

[0015] In a further embodiment, the steel dam gates G1, G2, and G3 are all erected to completely separate the river channel of the starting zone from other sub-areas; the gates Z1, Z4, and Z5 are opened, and the gates Z2 and Z6 are closed, so that the river system only circulates in the starting zone.

[0016] In a further embodiment, the steel dam gates G1, G2, and G3 are all erected to completely separate the river channel of each sub-area; the gates Z1, Z4, and Z5 are opened, and the gates Z2 and Z6 are closed, so that the river system separately circulates in each sub-area.

[0017] In a further embodiment, the steel dam gates G1 and G2 are erected and the steel dam gate G3 is laid down to make at least two sub-area river channels connected, the gates Z1, Z2, and Z6 are opened, and the gates Z4 and Z5 are closed to regulate the river system to form a large circulation.

[0018] In a further embodiment, at least one group of overflow weirs is arranged on the branch river channel of each sub-area, and the connecting line direction of adjacent overflow weirs is consistent with the direction of the main stream river channel.

[0019] The arrangement of the overflow valve includes the following arrangement process: the overflow weirs Y1, Y2, Y3, …, Yn are arranged along the direction of the main stream river channel. nWherein, n is the number of overflow weirs.

[0020] In another technical solution, an "X" type river network hydrodynamic regulation internal circulation device is provided, which comprises a processor and a memory storing computer program instructions; the processor reads and executes the computer program instructions to realize the above-mentioned method.

[0021] Beneficial effects: (1) Power is provided by the circulating pump station to control the distribution ratio of each river channel in the plain river network, so that the flow rate of most river channels can be optimized to between 0.05-0.15 m / s, the water flowability is good, the water dynamic conditions and water exchange period are maintained, the water self-purification capacity is enhanced, the degradation of pollutants in the water is accelerated, the water environmental quality is improved, the water health is maintained, and the ecological and landscape requirements are met.

[0022] (2) The circulating pump station is arranged at the key nodes of the river channel to solve the problem of hydrodynamic force of the plain X type river network. On the basis of river channel cutting area, full-area circulation, sub-area circulation, and free switching of circulation mode can be realized; at the same time, it does not affect the flood control and drainage of the area.

[0023] (3) The single-area circulation mode, multi-area circulation mode, and full-circulation mode scheduling scheme are combined with the construction development progress to solve the water dynamic and water environmental problems in different construction stages, optimize the water environmental carrying capacity of the river network in different construction areas according to the pollution conditions of different areas, improve the river network water environment, and realize sub-area circulation to ensure that the water environment of other areas is not affected by the key pollution areas under construction. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a water dynamic regulation engineering plan layout.

[0025] Figure 2 is a single-area circulation mode principle diagram (4m / s). 3

[0026] Figure 3 is a single-area circulation mode principle diagram (6m / s). 3

[0027] Figure 4 is a multi-area circulation mode principle diagram.

[0028] Figure 5 is a full-circulation mode principle diagram.

[0029] Figure 6 is a circulating pump station plan layout.

[0030] Figure 7 is a gate plan layout in the circulating pump station.

[0031] Figure 8 ​​This is a monitoring map of ammonia nitrogen in some river channels in Zones I and II after the rain. Detailed Implementation

[0032] Example 1

[0033] This application aims to address the hydrodynamic circulation problem in X-shaped river networks. Using the Singapore-Nanjing Eco-Tech Island (Jiangxinzhou) as a case study, the research reveals that the Eco-Tech Island is located in a plain river network area with flat terrain and poor water flow. The island's own poor hydrodynamic conditions and weak water circulation result in poor self-purification capacity, poor water quality, and an inability to meet ecological and landscape requirements.

[0034] To address this problem, this embodiment provides an "X"-shaped river network hydrodynamic regulation internal circulation method, comprising the following steps:

[0035] Determine the main channel within the river network along the direction of water flow, and obtain at least one tributary channel that intersects the main channel, and define the intersection of the main channel and the tributary channel as a key node.

[0036] Based on the key nodes, the river network is divided into at least two areas, and circulating pumping stations are constructed at the key nodes.

[0037] According to the development and construction progress, the single-zone circulation mode, multi-zone circulation mode, and full circulation mode will be used in sequence.

[0038] Based on one of the single-zone circulation mode, multi-zone circulation mode, or full circulation mode, the ecological water replenishment volume and water source are obtained, and the circulation pump station is started to replenish water and form a water flow circulation.

[0039] In this embodiment, the eco-technology island is taken as the research object. The main river channel within the eco-technology island and a tributary intersecting with the main river channel are obtained. The intersection of the main river channel and the tributary is the key node. For example... Figure 1 As shown, the key node is located at the confluence of the Changhe Waterway, Qixia Waterway, Yongding Waterway, and Shoudai Waterway. These waterways together form an X-shaped river network. Based on the key node and the development progress of the Eco-Tech Island, the island is divided into two zones: Zone I and Zone II.

[0040] The majority of the I area is built-up area with high population density, and there is ongoing construction, which has seriously polluted some of the river channels. The main pollution sources in the I area are: the I area is affected by foundation pit drainage, and the water quality of the river channels near construction sites is extremely poor, with yellow water and high turbidity. In addition, the domestic sewage generated by the office and living areas of construction sites is also one of the important pollution sources of the island's river channels. Foundation pit drainage refers to the precipitation work done to ensure that the foundation pit can be constructed in dry conditions, to prevent slope instability, foundation sand flow, pit bottom uplift, pit bottom piping, and a decrease in foundation bearing capacity, when the underground water level is higher than the excavation bottom surface during foundation pit excavation. The specific pollution data for the I area is that the foundation pit drainage of the construction site within the Ecological Science and Technology Island mainly exceeds the ammonia nitrogen standard, reaching 8-10 mg / L. The monitoring data of the Sizhe Road River shows that after foundation pit drainage, the ammonia nitrogen in the water body can increase rapidly from the initial 1.5 mg / L to 6.26 mg / L. The evaluation method for the pollution level in the I area is: 1. According to the "Surface Water Environmental Quality Standard" GB3838-2002 and the specific pollution data, the ammonia nitrogen concentration far exceeds the surface water V-class standard; 2. Field reconnaissance.

[0041] The II area is mainly the ecological development area, but there are still many areas that have not been demolished, and some river channels are seriously polluted by domestic sewage. The main pollution sources in the II area are: the area has not implemented complete sewage interception, there is direct discharge of domestic sewage, and there is construction site drainage around. The evaluation method for the pollution level in the II area is: according to the "Surface Water Environmental Quality Standard" GB3838-2002 and field reconnaissance.

[0042] The water quality test data for the I and II areas are as follows:

[0043] 1. Background monitoring

[0044] In February 2021, different types of revetments, geographical locations, and representative river channels with surrounding conditions were selected in the Ecological Science and Technology Island for background investigation of water quality (table below).

[0045] The Dongshou Waterway and the southern section of the Shoudai Waterway are located in the non-built-up area. The Dongshou Waterway is affected by the domestic sewage from the surrounding undeveloped areas, and the water quality is extremely poor, reaching the inferior V-class (table below). Since the Guoyuan Waterway has not been constructed, the top of the southern section of the Shoudai Waterway is currently a dead-end river, but this area is located in the ecologically developed area, surrounded by open areas without residential areas, and there is no agricultural non-point source pollution, so the water quality of the river is excellent, reaching the surface water II-class standard.

[0046]

[0047]

[0048] 2. Post-rain monitoring

[0049] Pollution source: The central core area of the ecological science and technology island is a provincial pilot for sponge city construction, but it is still under construction. The measures to reduce non-point source pollution in sponge cities are not complete, and are affected by pollution from undeveloped areas and construction sites, resulting in extremely serious initial rainwater pollution on the island.

[0050] Specific data: As shown in Figure 8 , the ammonia nitrogen concentration of some river channels in the island after rainfall far exceeds the surface water class V standard, with a maximum of 9.42 mg / L. Among them, the development river channel, the leap river channel, and the garden river channel are located in area I; the Hongguang river channel, the Shoudai north river channel, the Dongshou river channel, and the garden river channel are located in area II

[0051] In addition, the accumulated water in the rainwater sump was detected, and the overall water quality was good (table below), indicating that the river channel may be more affected by surrounding construction sites and other pollution during rainfall.

[0052]

[0053]

[0054] Water quality monitoring in rainwater sump in February 2021

[0055] As shown in Figure 1 , a circulating pump station (water conservancy hub in the figure) is built at the key node. The design flow of the circulating pump station is 6 m 3 / s, which is realized by 3 submersible axial flow pumps, each with a flow of 2 m 3 / s, and a design head of 2.5 m. The circulating pump station provides power for the internal circulation of the river channel in the island. The tail water after purification by the wetland and the Jiagiang water purified by the water purification plant are used as the daily ecological water supply source. The total area of the circulating pump station is 2500 m 2 , the supporting office building covers an area of 360 m 2 , and the parking lot covers an area of 450 m 2 . By controlling the gate inside the pump station, the water circulation of the region can be flexibly realized. The pump station is an underground structure, and the ground can be greened, which does not affect the landscape. Three groups of overflow weirs are arranged on the tributary river channels in area I, and two groups of overflow weirs are arranged on the tributary river channels in area II. The connecting line direction of adjacent overflow weirs is consistent with the direction of the main stream river channel.

[0056] With the progress of the island development and construction, it is divided into short-term, medium-term and long-term, corresponding to the single zone circulation mode, multi-zone circulation mode and full circulation mode. According to the different construction period, the island ecological water supplement is also different. In the early stage of development and construction, there is no water vegetation coverage in the river channel, and the self-purification capacity is weak. Considering the factors such as the failure of point source pollution interception, construction site pollution, and low reduction rate of non-point source pollution, the main target is to meet the ammonia nitrogen and SS standards. When the tail water wetland effluent and the clean water plant effluent are used as the water supplement source (SS < 5 mg / L), under the condition of no heavy rainfall or other emergencies, the daily recommended water replacement period is 9-10 days. With the progress of the development and construction of the island, the point source pollution is reduced, the self-purification capacity of the river channel is enhanced, and the non-point source pollution reduction measures of the sponge city are partially completed. The demand for ecological water supplement is reduced accordingly. However, the pollution sources caused by the construction site on the island change rapidly, have high timeliness, and are uncertain. Therefore, during this period, the water supplement is recommended to be targeted at key pollution areas and to be supplemented in different zones to save clean water sources. After the completion of the development and construction of the island, the self-purification capacity of the river channel is higher than the total amount of pollutants entering the river, and the ecological water supplement only needs to supplement the loss of water such as river channel evaporation and seepage, urban landscape water, and gate leakage, among which the main one is gate leakage.

[0057] In further embodiments, the construction of the circulating pump station includes the following construction process: setting up pumps B1, B2, B3, …, B i , steel dam gates G1, G2, G3, …, G j , and gates Z1, Z2, Z3, …, Z m , where i is the number of pumps, j is the number of steel dam gates, and m is the number of gates. The steel dam gate is located at the key node and is used to control the flow path between the main river channel and the branch river channel to obtain a predetermined shape flow path. Based on the predetermined shape flow path, the positions of the gates are arranged to realize corresponding reverse water inflow and outflow on both sides of the steel dam gate.

[0058] As shown in Figure 6 and 7 , the position of the 3# steel dam gate is determined according to the conversion of the original multi-directional flow into a fixed 8-shaped (predetermined shape flow path) circulating flow at the intersection point, and the functions of the 1# and 2# steel dam gates are to cooperate with the 3# steel dam gate to divide the 8-shaped river channel into two 0-shaped river channels. The number of pump stations is considered to freely switch the flow distribution of the two 0-shaped river channels, and the project demand is 2, 4, and 6 distribution. In this embodiment, 3 pumps with 2 flow rates are used, and if there are other demands, the number of pump stations will also change. The position of the gate also meets the demand of the flow direction. The general principle is that for the two 0-shaped river channels, there need to be water inlet and outlet gates on both sides of the steel dam gate, and for the 8-shaped river channel, there is water exchange between the two 0-shaped river channels that make up the 8-shaped river channel. Water enters one 0-shaped river channel and then returns to the first one from the other, and the water outlet and inlet are located on both sides of the steel dam gate.

[0059] As shown in Figure 6 and 7 , the construction of the circulating pump station specifically includes the following construction processes: setting up three pumps, three steel dam gates, and five gates; wherein the steel dam gates include: 1# steel dam gate (G1), 2# steel dam gate (G2), 3# steel dam gate (G3); and the gates include: 1# gate (Z1), 2# gate (Z2), 4# gate (Z4), 5# gate (Z5), 6# gate (Z6).

[0060] The arrangement of the overflow valve includes the following arrangement processes: setting up overflow weirs including: 1# overflow weir (Y1), 2# overflow weir (Y2), 3# overflow weir (Y3), 4# overflow weir (Y4), 5# overflow weir (Y5). 1# overflow weir and 2# overflow weir are set in Zone II, and 3# overflow weir, 4# overflow weir, and 5# overflow weir are set in Zone I. The overflow weirs are used to accurately control the water level-flow rate of the river network in the ecological science and technology island, create a water level difference, and improve the flow of urban river channels. 1# overflow weir, 2# overflow weir, 3# overflow weir, 4# overflow weir, and 5# overflow weir are respectively located in Zhoutai waterway, Dongshou waterway, Shiqiao waterway, Hongguang waterway, and Fazhan waterway. The arrangement of the five overflow weirs can achieve island circulation, separate zone circulation, and freely switch between island circulation and separate zone circulation through a comprehensive project. The overflow weirs need to be started when there is no control and guidance project in the branch river channel. The working principle of the overflow weir is as follows: the movable overflow weir can control the water height, when the overflow weir is completely laid down and opened, the overflow weir belongs to a wide-top weir, and the flow calculation formula uses the calculation formula of a wide-top weir without a sill, and when the overflow weir gate is closed, it is a thin-wall weir, and the flow calculation formula uses the calculation formula of a thin-wall weir; the movable overflow weir can raise the water level to increase the urban water level difference, while not hindering the navigation of pleasure boats, during operation, the requirements for daytime navigation of pleasure boats are met, the movable overflow weir is completely laid down, and at night, the overflow weir gate is closed, achieving self-flowing living water in the entire plain river network.

[0061] In further embodiments, using the single-zone circulation mode includes the following processes: setting the development and construction degree highest area as a starting area, starting at least two pumps, and supplementing all ecological water to the starting area; the steel dam gates are all erected, completely separating the river channels of the starting area and other areas; some gates are opened, and the remaining gates are closed, so that the river system only circulates in the starting area.

[0062] The specific details are as follows: In the initial stage of construction, the pollution level in Zone I is greater than that in Zone II, so Zone I is designated as the start-up zone; the single-zone circulation mode includes the following process: at least two pumps are activated to replenish all ecological water to Zone I; steel dam gates #1 (G1), #2 (G2), and #3 (G3) are erected to completely isolate the river channels in Zones I and II; gates #1 (Z1), #4 (Z4), and #5 (Z5) are opened, while gates #2 (Z2) and #6 (Z6) are closed; the river system circulates only in Zone I;

[0063] Control the opening of overflow weirs #3 (Y3), #4 (Y4), and #5 (Y5) to regulate the water diversion ratio and meet the river flow requirements; at the same time, control the water level in the starting area within the range of 5.54 to 5.60 m and the river flow velocity within the range of 0.05 to 0.15 m / s.

[0064] In the initial construction phase, a single-zone circulation model will be adopted. The daily ecological water replenishment for the initial construction area will be 60,000 m³. 3 / d, of which 40,000 m³ is effluent from wetland purification. 3 / d, the water treatment plant purifies 20,000 cubic meters of water from the Jiajiang River. 3 / d. During winter, due to the reduced purification efficiency of the tailrace wetland, the main source of makeup water is the effluent from the water treatment plant (40,000 m³). 3 / d), with wetland outflow as a secondary function (20,000 m³). 3 / d). When the wetland effluent does not meet the Class III surface water standard, only 40,000 m³ of effluent from the water treatment plant is needed as supplementary treatment. 3 / d. The number of pumps started in single-zone circulation mode is determined by the following two schemes:

[0065] (1) Pump station operation 4m 3 / s (Start both pumps)

[0066] like Figure 2 As shown, in this scheme, the normal water level is 5.5m, and the circulating pump station operates two pumps with a total flow rate of 4m. 3 A total of 60,000 cubic meters of ecological water will be diverted into the start-up area. The opening of overflow weirs #3, #4, and #5 will be controlled to ensure a reasonable water distribution ratio, meet the river flow requirements, and maintain the river level within the start-up area between 5.54 and 5.60 meters. Except for the tailwater channel and the inverted siphon, the flow velocity in other river channels can be optimized to a reasonable velocity threshold (0.05–0.15 m / s) to maintain normal river flow. The flowability of the tailwater channel can be improved and water quality ensured through different scheduling conditions. This plan is applicable to the initial construction phase of the island's start-up area.

[0067] (2) Pump station operation for 6m 3 / s (Starts three pumps)

[0068] like Figure 3As shown, the normal water level in this scheme is 5.5 m, and 60,000 m of ecological water is introduced into the starting area to start the three pumps of the circulating pump station, with a total of 6 m 3 / s, the opening degrees of 3# overflow weir, 4# overflow weir, and 5# overflow weir are controlled to ensure that the water distribution ratio is reasonable and the river flow demand is met. The water level in the starting area is between 5.52-5.63 m. Except for the tail channel and the inverted siphon, the flow velocity of the rest of the river can be optimized to be within the reasonable flow velocity threshold (0.05-0.15 m / s), maintaining the normal flow pattern of the river. Different scheduling conditions can be used to improve the flowability of the tail channel and ensure water quality. The flowability of this scheme is better than that when two pumps of the pump station are opened at 4 m / s. 3

[0069] According to the model simulation, when one pump of the circulating pump station is opened, the river network flow pattern in the starting area is not good. When two or three pumps are opened, most of the river network flow velocity can be optimized to be within the reasonable threshold. The number of pumps to be opened can be determined according to the actual demand during operation. In the early stage of the whole island development, the I area is selected as the starting area, and the daily ecological water supply is 60,000 m 3 / d, which is fully supplemented to the I area. The water surface elevation in the starting area is controlled to be between 5.5-5.8 m. When the water level in the starting area is high, the water can overflow to the II area and finally flow out from the pre-set drainage pump station.

[0070] In further embodiments, using the multi-zone circulation mode includes the following processes: opening at least three pumps to supplement ecological water to multiple subareas; all steel dam gates are raised to completely separate the river channels in each subarea; some gates are opened and the rest are closed to make the river system circulate separately in each subarea.

[0071] The specific description is as follows: In the middle stage of construction, the multi-zone circulation mode is adopted. The multi-zone circulation mode includes the following processes: opening three pumps; 1# steel dam gate (G1), 2# steel dam gate (G2), and 3# steel dam gate (G3) are all raised to completely separate the river channels in the I area and the II area; 1# gate (Z1), 4# gate (Z4), and 5# gate (Z5) are opened, and 2# gate (Z2) and 6# gate (Z6) are closed, so that the water circulates separately in the I area and the II area; the water quantity is distributed according to the actual scheduling to form double circulation in the I area and the II area;

[0072] The opening degrees of 1# overflow weir (Y1), 2# overflow weir (Y2), 3# overflow weir (Y3), 4# overflow weir (Y4), and 5# overflow weir (Y5) are controlled to regulate the water distribution ratio and meet the flow demand of the river channels in the I area and the II area; the water levels in the I area and the II area are controlled to be within the range of 5.50-5.60 m; and the flow velocity of the river is controlled to be within the range of 0.05-0.15 m / s.

[0073] The daily ecological water supply in the middle stage of the whole island construction is 60,000 m 3 / d, of which 40,000 m is tail water after wetland purification. 3 ​ / d, 20,000 m of water purified by the water purification plant 3 / d, 60,000 m of ecological water supplement in the dry season 3 / d, due to the reduced purification efficiency of the tail water wetland in winter, the water supplement source is mainly the water outlet of the water purification plant, and the water outlet of the wetland is supplemented. When the water outlet of the wetland does not meet the surface water class III standard, only 40,000 m of water outlet of the water purification plant is supplemented 3 / d, when the water supplement amount is insufficient in winter, the river channel can be operated at a low water level.

[0074] As shown in Figure 4 , the multi-zone circulation scheme is 60,000 m of ecological water supplement 3 / d, three pumps of the circulation pump station are opened, and the total flow is 6 m 3 / s, of which 4 m 3 / s in region I, 2 m 3 / s in region II, the opening degrees of 1#, 2#, 3#, 4# and 5# overflow weirs are controlled to ensure that the water distribution ratio is reasonable and the flow demand of the river channel in the multi-zone is met. The water level of the island river channel is between 5.50 and 5.60 m, and the flow rate of most of the river channels can be optimized to be within the reasonable flow rate threshold (0.05-0.15 m / s). For the non-reasonable flow rate threshold river channels such as the tail water channel, the inverted siphon and the Olympic Park divided river channel, the water flow can be improved through different dispatching conditions to ensure water quality. The 1# steel dam gate, the 2# steel dam gate and the 3# steel dam gate are all upright, completely separating the river channels in region I and region II; the 1# gate, the 4# gate and the 5# gate are opened, and the 2# gate and the 6# gate are closed, and the water bodies are separately circulated in region I and region II; the water amount is distributed according to the actual dispatching to form double circulation in region I and region II; the multi-zone circulation separates region I and region II, which can avoid water pollution in one area to other areas during construction and ensure the water environment quality.

[0075] The multi-zone circulation mode is adopted during the construction of the whole island, and the daily ecological water supplement is 60,000 m 3 / d, which is supplemented to the pump station, and the water amount is reasonably distributed according to the actual dispatching to form double circulation in region I and region II through the river channel control and guide engineering. When the water level is higher than 5.8 m, the water in region I flows out from the pre-set drainage pump station, and the water in region II flows out from the pre-set drainage pump station.

[0076] In a further embodiment, using the full circulation mode includes the following process: opening at least three pumps to supplement the ecological water supplement to all zones; some steel dam gates are upright, and the remaining steel dam gates are laid down to connect at least two zone river channels, some gate openings are opened, and the remaining gate openings are closed to control the river system to form a large circulation.

[0077] The specific details are as follows: During the mid-term construction, a full-circulation mode will be adopted. The full-circulation mode includes the following process: starting three pumps; erecting steel dam gates #1 (G1) and #2 (G2), and laying down steel dam gate #3 (G3), connecting the waterways of Zone I and Zone II; opening gates #1 (Z1), #2 (Z2), and #6 (Z6), and closing gates #4 (Z4) and #5 (Z5), thus regulating the river channel to form a large circulation.

[0078] Control the opening of overflow weirs #1 (Y1), #2 (Y2), #3 (Y3), #4 (Y4), and #5 (Y5) to regulate the water diversion ratio and meet the river flow requirements; control the river water level within the range of 5.40–5.62 m; and regulate the river flow velocity within the range of 0.05–0.15 m / s.

[0079] Once the entire island is completed, the daily ecological water replenishment capacity will be 40,000 cubic meters. 3 / d, all of which are effluent from the Jiajiang Water Source Purification Plant. For example... Figure 5 As shown, the island-wide water recycling system provides 40,000 m³ of ecological water replenishment. 3 / d, the circulating pump station starts three pumps with a total capacity of 6m 3 / s, controlling the opening of overflow weirs #1, #2, #3, #4, and #5 to ensure a reasonable water diversion ratio and meet the river flow requirements. The water level in the island's rivers is between 5.40 and 5.62 m. The flow velocity in most rivers can be optimized to within a reasonable velocity threshold (0.05–0.15 m / s). For rivers outside the reasonable velocity threshold, such as the Zhouwei Waterway, the inverted siphon, and the waterways divided by the Youth Olympic Park, different scheduling conditions can be used to improve water flow and ensure water quality. This scheme achieves optimal water flow. After the island's development and construction are completed, the distinction between Zone I and Zone II will be eliminated, and a full circulation model will be adopted. Through river control engineering, the river water will form an internal large circulation throughout the island, with a daily replenishment of approximately 40,000 m³ / d, replenishing the pumping stations. When the water level exceeds 5.8 m, the water can flow out from the pre-set drainage pumping stations.

[0080] Example 2

[0081] This embodiment provides an "X"-shaped river network hydrodynamic regulation internal circulation device, the device including: a processor and a memory storing computer program instructions; the processor reads and executes the computer program instructions to implement the method in embodiment 1.

Claims

1. A method for regulating the internal circulation of hydrodynamics in an "X"-shaped river network, characterized in that, Includes the following steps: Determine the main channel within the river network along the direction of water flow, and obtain at least one tributary channel that intersects the main channel, and define the intersection of the main channel and the tributary channel as a key node. Based on the key nodes, the river network is divided into at least two areas, and circulating pumping stations are constructed at the key nodes. The construction process of a circulating pumping station includes the following steps: setting up pumps B1, B2, B3, ..., B i Steel dam gates G1, G2, G3, ..., G j And gates Z1, Z2, Z3, ..., Z m , where i is the number of pumps, and i≥3, j is the number of steel dam gates, and m is the number of gates; The steel dam gate is located at a key node to control the flow path between the main river channel and the tributary river channel to obtain a predetermined flow path; based on the predetermined flow path, the gate positions are arranged to realize the corresponding reverse water inflow and outflow on both sides of the steel dam gate. Create and use single-zone loop mode, multi-zone loop mode, and full loop mode in sequence; The creation of the single-zone circulation mode includes the following process: the area with the highest level of development and construction is set as the starting area; 2~i pumps are turned on to replenish the ecological water supply to the starting area; steel dam gates are erected to completely isolate the starting area from the river channels of other areas; some gates are opened and the remaining gates are closed, so that the river system circulates only in the starting area. The creation of the multi-zone circulation mode includes the following process: turn on 3~i pumps to replenish the ecological water supply to the corresponding zone; erect all steel dam gates to completely isolate the river channel in the corresponding zone; open some gates and close the remaining gates to allow the river system to circulate separately in each zone. The creation of the full-cycle mode includes the following process: turn on 3~i pumps to replenish the ecological water supply to all areas; erect some steel dam gates and lay down the remaining steel dam gates to connect the waterways of at least two areas; open some gates and close the remaining gates to regulate the waterway system to form a large cycle. Based on one of the single-zone circulation mode, multi-zone circulation mode, or full circulation mode, the ecological water replenishment volume and water source are obtained, and the circulation pump station is started to replenish water and form a water flow circulation.

2. The "X"-shaped river network hydrodynamic regulation internal circulation method as described in claim 1, characterized in that, Steel dam gates G1, G2, and G3 are all erected, completely isolating the starting area from the waterways of other areas; gates Z1, Z4, and Z5 are opened, while gates Z2 and Z6 are closed, and the water system circulates only in the starting area.

3. The "X"-shaped river network hydrodynamic regulation internal circulation method as described in claim 1, characterized in that, Steel dam gates G1, G2, and G3 are erected, completely isolating the river channels in each area; gates Z1, Z4, and Z5 are opened, while gates Z2 and Z6 are closed, allowing the river system to circulate separately within each area.

4. The "X"-shaped river network hydrodynamic regulation internal circulation method as described in claim 1, characterized in that, Steel dam gates G1 and G2 are erected, and steel dam gate G3 is laid down, connecting at least two river sections. Gates Z1, Z2, and Z6 are opened, and gates Z4 and Z5 are closed, regulating the river system to form a large circulation.

5. The "X"-shaped river network hydrodynamic regulation internal circulation method as described in claim 1, characterized in that, At least one set of overflow weirs shall be arranged on the tributary channels of each area, and the direction of the line connecting adjacent overflow weirs shall be consistent with the direction of the main channel. The arrangement of overflow valves includes the following process: Install overflow weirs Y1, Y2, Y3, ..., Y along the main river channel. n , where n is the number of overflow weirs.

6. An "X"-shaped river network hydrodynamic regulation internal circulation device, characterized in that, The device includes: a processor and a memory storing computer program instructions; the processor reads and executes the computer program instructions to implement the method according to any one of claims 1 to 5.

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