Ecological reservoir communicating water gate allowing for efficient water resource utilization, and scheduling method using same

Abstract

Disclosed in the present invention are an ecological reservoir communicating water gate allowing for efficient water resource utilization, and a scheduling method using same. The water gate communicates a main reservoir and an ecological reservoir; a diversion open channel extending towards the ecological reservoir is arranged on the upstream of a gate chamber; a drainage open channel extending towards the main reservoir is arranged on the downstream of the gate chamber; splayed walls having arcs on two sides changing outwards gradually are arranged at the tail ends of the diversion open channel and the drainage open channel; the centerlines of the diversion open channel and the drainage open channel are bent in an obtuse angle with a circular arc transition. The scheduling method is a water gate operation scheduling scheme, which is as follows: a water gate is usually closed during normal times; when it rains, if the water level in an ecological reservoir rises to a height above water levels corresponding to floods with a return period of once every 50 years or greater, the water gate is opened; after the rain, when the water level in the ecological reservoir drops to a height below the water levels corresponding to floods with a return period of once every 50 years or greater, the water gate is closed. The present invention achieves the functions of rainwater purification and flood discharge.

Description

An ecological reservoir interconnecting sluice for efficient water resource utilization and its dispatching method Technical Field

[0001] The present invention relates to an ecological reservoir interconnecting sluice for efficient utilization of water resources and a dispatching method thereof, belonging to the technical field of water conservancy projects. Background Art

[0002] Currently, urban areas within reservoir basins are actively promoting projects to rectify source pollution and separate rainwater and sewage within the broader context of water quality improvement. This is expected to address point source pollution, such as leaked sewage. However, due to the large proportion of urban areas, the total amount of pollution entering reservoirs under current and planned rainwater and sewage diversion rates is very high. The impact of non-point source pollution on urban river water quality will gradually become apparent as municipal sewage collection rates increase. Therefore, non-point source pollution of rivers and reservoirs is an unavoidable reality, and its control is essential. The unstable water quality of drinking water source reservoirs is primarily due to substandard water quality in the rivers entering the reservoirs. The water quality of major tributaries in developed cities remains at Class V, far below the water quality standards for entering reservoirs. Environmental protection authorities are gradually increasing their efforts to protect drinking water source reservoirs, with stricter assessment requirements. At present, the sampling and assessment sections of the reservoir are all at the water intake of the water supply pipeline. The water quality is better than that of other areas. The changes in the water quality assessment sections of the reservoir, including the locations of the tributary rivers entering the reservoir, will be included. The situation of substandard water quality in the rivers entering the reservoir will become more serious.

[0003] Initial rainwater, with its high pollutant concentrations and poor quality, is unsuitable for direct entry into the reservoir. Therefore, this initial rainwater must be treated before discharge. By constructing ecological dams within a certain range of the inflowing tributaries, the reservoir is divided into a main reservoir and an ecological reservoir. The main reservoir retains its original water source function, while the ecological reservoir, through wetland construction, purifies the initial rainwater and discharges it to downstream rivers through pipes or channels to meet standards, thereby providing ecological water replenishment and achieving efficient water resource utilization. Summary of the Invention

[0004] In order to solve the above problems, the present invention discloses an ecological reservoir interconnecting sluice gate and a dispatching method thereof for efficient utilization of water resources. The specific technical solution is as follows:

[0005] An ecological reservoir connecting sluice for efficient utilization of water resources, wherein the ecological reservoir connecting sluice is arranged in the ecological dam between the main reservoir and the ecological reservoir. When the sluice is opened, the main reservoir and the ecological reservoir are connected. When the sluice is closed, the water source connection between the main reservoir and the ecological reservoir is cut off. The sluice comprises a gate chamber vertically dug in the ecological dam, which crosses the ecological dam horizontally to connect the main reservoir and the ecological reservoir. A gate pier is arranged in the middle of the width direction of the gate chamber, and a gate pier is formed between the two sides of the gate pier and the opposite bank. A sluice water passage is provided with a vertically liftable gate in the sluice water passage, the gate chamber is upstream facing the ecological reservoir, and downstream facing the main reservoir, an open water diversion channel extending toward the ecological reservoir is provided upstream of the sluice chamber, and an open drainage channel extending toward the main reservoir is provided downstream of the sluice chamber, the ends of the open water diversion channel and the open drainage channel are both provided with an eight-shaped wall with arcs on both sides gradually changing outwards, and the center lines of the open water diversion channel and the open drainage channel are both obtuse-angled bends with circular arc transitions.

[0006] Furthermore, a sidewalk is provided on the top of the ecological dam, the gate chamber section is located below the sidewalk, the gate is located on the upstream side of the gate chamber section, and plastic steel steps are vertically provided from the top of the dam to the bottom of the dam near the upstream and downstream sides of the ecological dam.

[0007] Furthermore, the upstream and downstream of the ecological dam are both set to slopes, the upstream bottom is provided with an upstream bottom protection section, and the downstream bottom is provided with a downstream seawall section.

[0008] Furthermore, the gate uses a jack-up flat steel gate. The jack-up flat steel gate has no upper frame and cannot be completely removed from the groove. The oil cylinder and oil seal are not easily worn, and the applicable gate width is greater than 8m and less than 15m.

[0009] Furthermore, the center lines of the water diversion channel and the drainage channel are curved in opposite directions.

[0010] Furthermore, the flow capacity of the sluice meets the following conditions:

[0011] Take the water level in the ecological reservoir when a flood with a frequency of 50 years or more occurs and substitute it into the following formula to calculate:

[0012]

[0013] Among them, the lateral contraction coefficient

[0014]

[0015]

[0016] Where Q is the flow rate through the gate (m 3 / s),

[0017] b0——total net width of the lock chamber (m),

[0018] H0——Head above the weir including the approaching flow velocity head (m),

[0019] hs——downstream water depth from the gate bottom plate (m),

[0020] g——acceleration due to gravity, which can be 9.81 (m / s 2 ),

[0021] σ——weir flow submergence coefficient,

[0022] m——Weir flow coefficient, flat bottom gate m=0.385,

[0023] d z ——Thickness of the middle pier,

[0024] b b ——The distance between the downstream edge of the side gate pier and the upstream river water edge,

[0025] The flow capacity of the sluice is calculated. If the calculated flow is greater than the design flow, the newly built sluice meets the flow requirements.

[0026] Furthermore, the stability calculation of the sluice chamber must meet the following conditions:

[0027] The lock chamber stability calculation includes anti-sliding stability calculation, base stress calculation and verification of the ratio of maximum to minimum stress;

[0028] (1) Working condition selection

[0029] Working condition 1: Completed working condition, no water upstream and downstream of the gate.

[0030] Working condition 2: water-blocking working condition, when the water level of the main reservoir upstream of the gate is not less than the flood level with a frequency of 50 years or more, there is no water downstream;

[0031] (2) Calculation of the lock chamber base stress

[0032]

[0033] Where, — Maximum and minimum stress values ​​of the chamber base (KN / m 2 ),

[0034] —Total vertical load acting on the lock chamber (including buoyancy and uplift pressure acting on the base, KN),

[0035] —The moment of the centripetal axis of the foundation bottom perpendicular to the direction of water flow of all vertical and horizontal loads acting on the gate chamber (KN·m),

[0036] A—the area of ​​the bottom surface of the lock chamber (m 2 ),

[0037] G—section moment of the bottom surface of the lock chamber with respect to the centroidal axis of the bottom surface (m 3 ),

[0038] (3) Calculation of anti-sliding stability of the lock chamber

[0039]

[0040] Where:

[0041] kc—slide resistance stability safety factor of the lock chamber,

[0042] f—the friction coefficient between the base of the lock chamber and the soil foundation. According to the sluice design specification table, the f value of the silt foundation can be taken as 0.2.

[0043] - All vertical loads acting on the lock chamber (including uplift pressure on the base, which is temporarily calculated based on the unfavorable situation of not taking anti-seepage measures, unit: KN),

[0044] —Total horizontal load acting on the lock chamber (KN),

[0045] The anti-sliding stability safety factor of the lock chamber section and the ratio of maximum and minimum base stresses must meet the requirements of the "Water Gate Design Code" (SL265-2016).

[0046] A scheduling method for interconnected sluice gates in an ecological reservoir based on efficient water resource utilization. The sluice gate operation scheduling plan is as follows: the sluice gate is usually closed during normal times; when it rains, when the water level in the ecological reservoir rises above the level of a flood with a frequency of 50 years or more, the sluice gate is opened; after the rain, when the water level in the ecological reservoir drops below the level of a flood with a frequency of 50 years or more, the sluice gate is closed;

[0047] When a reservoir floods during the flood season, the main reservoir is dispatched according to the three-level control and discharge system, specifically:

[0048] (1) Before the flood season arrives, the water level of the main reservoir needs to be lowered to the flood control limit water level, and this water level is used as the flood control water level during the flood season. The design flood control water level is 3-5m lower than the flood level with a frequency of 50 years or more;

[0049] (2) When the reservoir encounters a flood, if the water level in front of the main reservoir gate is less than or equal to the flood level of 0.6-1m with a frequency of less than 50 years or more, the reservoir adopts the first-level controlled discharge with a controlled discharge flow of 50m 3 / s;

[0050] (3) If the water level in front of the main reservoir gate continues to rise after the first-level controlled discharge is adopted, when the water level in front of the main reservoir gate is 0.6-1m higher than the flood level with a frequency of less than 50 years or more, but less than or equal to the flood level with a frequency of less than 50 years or more, 0.3-0.4m, the main reservoir will implement the second-level controlled discharge, with a second-level controlled discharge flow of 100m 3 / s;

[0051] (4) If the water level in front of the main reservoir gate continues to rise after the second-level controlled discharge is adopted, when the water level in front of the main reservoir gate is 0.3-0.4m higher than or less than the flood level with a frequency of 50 years or more, but lower than or equal to the flood level with a frequency of 50 years or more, the main reservoir will implement the third-level controlled discharge, with a third-level controlled discharge flow of 120m 3 / s;

[0052] (5) When the water level in front of the main reservoir gate exceeds the flood level with a frequency of 50 years or more, the gate will be fully opened to discharge water.

[0053] Furthermore, it also includes ecological reservoir scheduling, and the ecological reservoir is also connected to two secondary ecological reservoirs with different directions, one of the secondary ecological reservoirs is provided with No. 1 water gate on its connecting channel, No. 1 water gate is the ecological reservoir interconnection control gate, and water enters the ecological reservoir from the secondary ecological reservoir through No. 1 water gate, and the other secondary ecological reservoir is provided with No. 2 water gate on its connecting channel, No. 2 water gate is the ecological reservoir discharge gate, and water is discharged from the ecological reservoir to the secondary ecological reservoir through No. 2 water gate, and the interconnection water gate between the ecological reservoir and the main reservoir is called No. 3 water gate, and No. 3 water gate is the ecological reservoir interconnection water gate for efficient utilization of water resources as described in any one of claims 1 to 7, specifically:

[0054] Working condition 1: dry season

[0055] When the incoming water is sewage from leakage during the dry season, the basin will lift the sewage to the municipal sewage system through the existing riverside sewage interception system, and it will not enter the ecological reservoir;

[0056] Working condition 2: initial rain below 7mm

[0057] When initial rainfall of less than 7mm occurs, the basin will use the existing independent sewage interception system to transfer the initial rainfall of less than 7mm through the tunnel to the flood drainage channel, and will not enter the ecological reservoir; or the sewage interception system and upstream decentralized treatment facilities will discharge the initial rainfall of less than 7mm into the municipal sewage system, and will not enter the ecological reservoir;

[0058] Working condition 3: rainfall of 7 mm or more and less than 50-year return period

[0059] When rainfall of 7mm or more and a return period of less than 50 years occurs and the meteorological department issues a yellow rainstorm warning or above, the water level in the ecological reservoir will be controlled at flood limit water level 1 by controlling the opening of No. 1 sluice gate, and the water level in the ecological reservoir will be controlled at flood limit water level 2 by controlling the opening of No. 2 sluice gate, and the opening of No. 3 sluice gate will be closed. If the meteorological department does not issue a yellow rainstorm warning or above, the water level in the ecological reservoir will be controlled at landscape water level 1 by controlling the opening of No. 1 sluice gate, and the water level in the ecological reservoir will be controlled at landscape water level 2 by controlling the opening of No. 2 sluice gate, and No. 3 sluice gate will be closed.

[0060] Working condition 4: rainfall with a return period of more than 50 years

[0061] When rainfall occurs once in 50 years or more, No. 1 and No. 2 sluice gates are closed. The flood in the secondary ecological reservoir exceeds the control water level and flows over the top of the overflow dam into the ecological reservoir. No. 3 sluice gate is opened, and the flood in the ecological reservoir enters the main reservoir and is discharged after being regulated by the main reservoir.

[0062] Furthermore, the flood limit water level 1 is greater than the flood limit water level 2, and the landscape water level 1 is greater than the landscape water level 2.

[0063] Normally, the landscape water level is higher than the flood season water level. Landscape water level 1 is higher than flood limit water level 1, and landscape water level 2 is higher than flood limit water level 2.

[0064] The beneficial effects of the present invention are:

[0065] The ecological reservoir in this invention purifies initial rainwater or domestic sewage and is isolated from the main reservoir. The rational regulation and scheduling of the sluice gates allows for the discharge of subsequent rainwater to the main reservoir during flood discharge, effectively discharging and draining the water, as well as storing domestic water. This not only ensures the water quality of drinking water sources, but also allows for the interconnection and natural purification of initial rainwater or domestic sewage, resulting in efficient utilization of water resources in water-scarce and water-quality-deficient cities. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] FIG1 is a plan view of a sluice gate according to the present invention,

[0067] FIG2 is a longitudinal sectional view of a sluice gate according to the present invention,

[0068] List of reference numerals: 1—gate pier, 2—gate chamber, 3—maintenance ladder, 4—open water diversion channel, 5—Eight-shaped wall, 6—sidewalk, 7—gate, 8—plastic steel step. DETAILED DESCRIPTION

[0069] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0070] As can be seen from Figures 1-2, the present invention is an eco-reservoir connecting sluice gate set in the eco-dam between the main reservoir and the eco-reservoir. When the sluice gate is opened, the main reservoir and the eco-reservoir are connected. When the sluice gate is closed, the water source connection between the main reservoir and the eco-reservoir is cut off. The specific structure is: the gate chamber 2 crosses the eco-dam, connecting the main reservoir and the eco-reservoir. A gate pier 1 is set in the middle of the width direction of the gate chamber. A sluice water channel is formed between the two sides of the gate pier and the opposite bank. A vertically liftable gate is set in the sluice water channel. Maintenance ladders 3 are set on both sides of the gate pier 1 and the place where the sluice water channel and the shore are used for manual maintenance and climbing. The lock chamber's upstream side faces the eco-reservoir, while its downstream side faces the main reservoir. A diversion channel extends upstream of the lock chamber toward the eco-reservoir, while a drainage channel extends downstream toward the main reservoir. Both the diversion channel (4) and the drainage channel have outward-curving, gradually curved, splayed walls (5) at their ends. The centerlines of both channels are bent at obtuse angles, forming a circular transition. The centerlines of the diversion channel and the drainage channel curve in opposite directions, creating a buffer between upstream and downstream flows.

[0071] A sidewalk is provided on the top of the ecological dam, the gate chamber section is located below the sidewalk 6, and the gate 7 is located on the upstream side of the gate chamber section. Plastic steel steps 8 are vertically provided from the top of the dam to the bottom of the dam near the upstream and downstream sides of the ecological dam.

[0072] The upstream and downstream of the ecological dam are both set as slopes, with an upstream bottom protection section at the bottom of the upstream and a downstream seawall section at the bottom of the downstream.

[0073] The gate uses a jack-up flat steel gate. The jack-up flat steel gate has no upper frame and cannot be completely removed from the groove. The oil cylinder and oil seal are not easily worn. It is suitable for gate widths greater than 8m and less than 15m.

[0074] The application of the present invention in practical engineering is described below with reference to a specific embodiment.

[0075] Taking the drinking water source reservoir in Bao'an District, Shenzhen City, Guangdong Province as an example, the application of this patented method is introduced:

[0076] Step 1: Sluice Site Selection

[0077] Based on the ecological embankment layout and surrounding terrain conditions, three sluice site selection options are proposed:

[0078] Option 1: Located at the center axis of the ecological embankment, where the water flow in and out is relatively straight, there is ample construction space. However, building a sluice gate on the ecological embankment filled with earth and rock requires high foundation treatment, resulting in significant settlement during use and high costs.

[0079] Option 2 is located on the right bank of the ecological embankment, which is close to the water intake of the main reservoir and will affect the water intake structure. It is also on the same side as the water intake gate of the ecological reservoir, and will also affect each other. There is sufficient construction space and the cost is low.

[0080] Option three is located on the left bank of the ecological embankment, where the terrain is relatively gentle, there is sufficient construction space and the cost is relatively low.

[0081] In summary, through preliminary comparison of sluice site selection, the sluice site is located on the left bank of the ecological embankment.

[0082] Step 2: Gate type selection

[0083] According to the functional requirements of the sluice gate and combined with the topography and geological conditions of the sluice site, three gate types were selected for comparison: "vertical lifting flat steel gate + fixed winch", "jack-lifting flat steel gate + plunger hydraulic opening and closing machine" and "central axis rotary horizontal flap gate". The design comprehensively considered factors such as investment, operation management, maintenance, flood discharge and landscape, and conducted a detailed comparison of the above three gate types to determine the optimal gate type for this project.

[0084] The advantages and disadvantages of the above three solutions are compared in Table 1 below.

[0085] Table 1 Comparison of gate type options

[0086]

[0087] After comprehensively comparing the advantages and disadvantages of the above-mentioned various gate types, and considering the scale, landscape effect, functional requirements, and economic rationality of this sluice, the jack-up flat steel gate is proposed as the recommended solution for this project.

[0088] Step 3: Layout of sluice structure

[0089] Located on the left bank of the ecological embankment, the sluice gate has two openings measuring 6.0 x 3.0 meters. The gate chamber is 18 meters long, the gate bottom elevation is 26.5 meters, and the gate pier top elevation is 30.62 meters. Upstream of the gate chamber, a diversion channel is 37.9 meters long, 13.5 meters wide, with a bottom elevation of 26.5 meters, and a gradually curved, shaped, figure-shaped wall at the inlet. Downstream of the gate chamber, a drainage channel is 31.30 meters long, 13.5 meters wide, with a bottom elevation of 26.5 meters, and a gradually curved, shaped, figure-shaped wall at the outlet.

[0090] Step 4: Review of sluice flow capacity

[0091] When a flood with a return frequency of 50 years or more occurs (i.e. the water level in the eco-reservoir reaches 28.0m), the sluice gate opens to connect the eco-reservoir and the main reservoir. After flood control calculations, when the water level in the eco-reservoir reaches 28.91m, the maximum flow rate of the sluice gate is required to be no less than 71.64m 3 / s, so the working condition considered in the calculation is the maximum flow capacity of the lock chamber: when the flood level of the ecological reservoir is 28.91m, the corresponding main reservoir water level is 27.10m, and the design elevation of the lock chamber bottom is 26.5m. According to the "Water Gate Design Code" (SL265-2016), for the flat-bottom gate, the following formula is used for calculation:

[0092]

[0093] Among them, the lateral contraction coefficient

[0094]

[0095]

[0096] Where Q is the flow rate through the gate (m 3 / s)

[0097] b0——total net width of the lock chamber (m)

[0098] H0——Head above weir including approaching flow velocity head (m)

[0099] hs——downstream water depth from the gate bottom plate (m)

[0100] g——acceleration due to gravity, which can be 9.81 (m / s 2 )

[0101] σ——Weir flow submergence coefficient

[0102] m——Weir flow coefficient, flat bottom gate m=0.385

[0103] d z ——Thickness of middle pier

[0104] b b ——The distance between the downstream edge of the side gate pier and the upstream river water edge

[0105] Since the flow velocity is very small, it is ignored in this calculation. The water head on the weir is H=Ho, so hs / H=0.6 / 2.03=0.3<0.8, which is considered free outflow, so σ=1.0. The calculation results of the sluice flow capacity are shown in Table 2 below:

[0106] Table 2 Calculation results of sluice flow capacity

[0107]

[0108] From the table above, we can see that the calculated flow rate is 74.62 m 3 / s>Design flow rate 71.64 m 3 / s, so the newly built sluice meets the flow requirements.

[0109] Step 5: Chamber stability calculation

[0110] This lock chamber stability calculation includes anti-sliding stability calculation, base stress calculation and verification of the ratio of maximum to minimum stress.

[0111] (1) Working condition selection

[0112] Working condition 1: Completed working condition, no water upstream and downstream of the sluice gate;

[0113] Working condition 2: water retaining condition, the water level of the main reservoir downstream of the gate is 28.7m, and there is no water downstream.

[0114] (2) Calculation of the lock chamber base stress

[0115] The stress of the gate chamber base should be calculated according to the "Water Gate Design Code":

[0116]

[0117] Where, — Maximum and minimum stress values ​​of the chamber base (KN / m 2 )

[0118] —Total vertical load acting on the lock chamber (including buoyancy and uplift pressure acting on the base, KN)

[0119] —The moment of the centripetal axis perpendicular to the flow direction of the foundation bottom surface under all vertical and horizontal loads acting on the gate chamber (KN·m)

[0120] A——the area of ​​the bottom surface of the lock chamber (m 2 )

[0121] G——section moment of the bottom surface of the lock chamber with respect to the centroidal axis of the bottom surface (m 3 )

[0122] (3) Calculation of anti-sliding stability of the lock chamber

[0123] The stability calculation of the lock chamber is based on the "Water Gate Design Code":

[0124]

[0125] Where:

[0126] kc—slide resistance stability safety factor of the lock chamber;

[0127] f—the friction coefficient between the base of the lock chamber and the soil foundation. According to the sluice design specification table, the f value of the silt foundation can be taken as 0.2;

[0128] —Total vertical load acting on the lock chamber (including uplift pressure on the foundation, which is temporarily calculated based on the unfavorable situation of not taking anti-seepage measures, unit: KN)

[0129] —Total horizontal load acting on the lock chamber (KN)

[0130] After calculation, various load combinations, the compressive stress of the gate chamber base and the anti-sliding safety factor are shown in Table 3 below.

[0131] Table 3 Calculation results of the lock chamber structure

[0132]

[0133] The table above shows that the anti-sliding stability safety factor and the ratio of maximum to minimum base stress for the lock chamber section meet regulatory requirements. Geological exploration results indicate that the bottom of the structure's floor is located in a silty clay layer with a foundation bearing capacity of 110 kPa, which is greater than the maximum base stress.

[0134] Step 6: Operation of sluice gates, main reservoirs and ecological reservoirs

[0135] sluice gate operation

[0136] A connecting gate is installed on the ecological dam to ensure that the ecological reservoir and the main reservoir are connected, allowing them to jointly perform their water storage and regulation functions. Normally, the gate is closed, ensuring that the main reservoir and the ecological reservoir are separated during floods with a frequency of 50 years or less. When a flood with a frequency of 50 years or more occurs, the gate is opened, connecting the main reservoir and the ecological reservoir, allowing them to jointly perform their water storage and regulation functions.

[0137] Based on the sluice gate's function, the sluice gate's operation schedule is as follows: The sluice gate is normally closed during normal times. During rainy periods, when the water level in the ecological reservoir rises to 28.0m, the sluice gate is opened. After rain, when the water level in the ecological reservoir drops to 28.0m, the sluice gate is closed.

[0138] Main reservoir operation

[0139] When a flood occurs in a reservoir during the flood season, the main reservoir is operated according to the three-level control discharge, specifically: ① Before the flood season arrives, the water level of the main reservoir needs to be lowered to the flood control limit water level, and this water level is used as the flood control water level during the flood season. The designed flood control water level is 25.45m; ② When the reservoir encounters a flood, if the water level in front of the main reservoir gate is less than or equal to 28.10m, the reservoir adopts the first-level control discharge, and the control discharge flow is 50m 3 / s; ③ If the water level in front of the main reservoir gate continues to rise after the first-level controlled discharge flow is adopted, when the water level in front of the main reservoir gate is greater than 28.10m but less than or equal to 28.42m, the main reservoir will implement the second-level controlled discharge, and the second-level controlled discharge flow is 100m 3 / s; ④ If the water level in front of the main reservoir gate continues to rise after the second-level controlled discharge is adopted, when the water level in front of the main reservoir gate is greater than 28.42m but less than or equal to 28.73m, the main reservoir will implement the third-level controlled discharge, and the third-level controlled discharge flow is 120m 3 / s; ⑤ When the water level in front of the main reservoir gate exceeds 28.73m, the gate will be fully opened to discharge.

[0140] Ecological reservoir operation

[0141] Working condition 1: dry season

[0142] When the incoming water is sewage leaked during the dry season, the basin will lift the sewage to the municipal sewage system through the existing riverside sewage interception system, and it will not enter the ecological reservoir.

[0143] Working condition 2: initial rain below 7mm

[0144] When the initial rainfall of less than 7 mm occurs, the basin will transfer the initial rainfall of less than 7 mm through the DN1800 tunnel to the flood drainage channel through the existing independent sewage interception system, and it will not enter the ecological reservoir; it can also discharge the initial rainfall of less than 7 mm into the municipal sewage system through the sewage interception system and upstream decentralized treatment facilities, and it will not enter the ecological reservoir.

[0145] Working condition 3: rainfall of 7 mm or more and less than 50-year return period

[0146] When rainfall of more than 7 mm and a return period of less than 50 years occurs and the meteorological department issues a yellow rainstorm warning or above, the water level in the ecological reservoir will be controlled at the flood limit water level of 22m by controlling No. 1 sluice gate, the water level in the ecological reservoir will be controlled at the flood limit water level of 21m by controlling No. 2 sluice gate, and No. 3 sluice gate will be closed; if the meteorological department does not issue a yellow rainstorm warning or above, the water level in the ecological reservoir will be controlled at the landscape water level of 22.5m by controlling No. 1 sluice gate, the water level in the ecological reservoir will be controlled at the landscape water level of 21.5m by controlling No. 1 sluice gate, and No. 3 sluice gate will be closed.

[0147] Working condition 4: rainfall with a return period of more than 50 years

[0148] When rainfall occurs once in 50 years or more, No. 1 and No. 2 sluice gates are closed, and No. 3 sluice gate is opened. The flood in the ecological reservoir exceeds the control water level and flows over the top of the overflow dam into the main reservoir, and is discharged after being regulated by the main reservoir.

[0149] Step 7: Impact analysis of downstream river ecological water replenishment

[0150] 1) At present, project construction should be based on the current situation and make full use of existing facilities in the upstream and downstream rivers to ensure that the water quality of the reservoir meets the standards.

[0151] 2) Based on the first principle, in the near term, when the comprehensive improvement of the upstream river channel is not thorough and the existing temporary water replenishment measures are in effect, the construction of ecological reservoirs should be used to provide water sources for possible ecological water replenishment rivers, creating conditions for the revision of relevant plans such as the river channel water replenishment plan in the future; in the long term, after the temporary water replenishment measures are abolished, the relevant rivers should be combined with the revised water replenishment plan, and water should be taken from the ecological reservoir of this project through new pipelines or the use of existing pipelines to replenish the relevant rivers.

Claims

1. An ecological reservoir connecting sluice for efficient use of water resources, wherein the ecological reservoir connecting sluice is arranged in the ecological dam of the main reservoir and the ecological reservoir, and when the sluice is opened, the main reservoir and the ecological reservoir are connected, and when the sluice is closed, the water source connection between the main reservoir and the ecological reservoir is cut off, characterized in that: It includes a gate chamber dug vertically in the ecological dam, which crosses the ecological dam and connects the main reservoir and the ecological reservoir. A gate pier is arranged in the middle of the gate chamber in the width direction, and a sluice water passage is formed between the two sides of the gate pier and the opposite banks. A vertically liftable gate is arranged in the sluice water passage. The gate chamber is upstream on the side facing the ecological reservoir and downstream on the side facing the main reservoir. An open water diversion channel extending toward the ecological reservoir is arranged upstream of the gate chamber, and an open drainage channel extending toward the main reservoir is arranged downstream of the gate chamber. The ends of the water diversion open channel and the drainage open channel are both provided with two-sided arc-shaped outward-gradient eight-shaped walls, and the center lines of the water diversion open channel and the drainage open channel are both in the shape of an obtuse bend with a circular arc transition.

2. The ecological reservoir interconnecting sluice for efficient utilization of water resources according to claim 1 is characterized in that: A sidewalk is arranged on the top of the ecological dam, the gate chamber section is located below the sidewalk, the gate is located on the upstream side of the gate chamber section, and plastic steel steps from the dam top to the dam bottom are vertically arranged near the upstream side and the downstream side of the ecological dam.

3. The ecological reservoir interconnecting sluice for efficient utilization of water resources according to claim 1 is characterized in that: The upstream and downstream of the ecological dam are both arranged to be sloped, an upstream bottom protection section is arranged at the bottom of the upstream, and a downstream sea floodplain section is arranged at the bottom of the downstream.

4. The ecological reservoir interconnecting sluice for efficient utilization of water resources according to claim 1 is characterized in that: The gate is a jack-up flat steel gate. The jack-up flat steel gate has no upper frame and cannot be completely removed from the groove. The oil cylinder and oil seal are not easy to wear. The gate width is suitable for gates greater than 8m and less than 15m.

5. The ecological reservoir interconnecting sluice for efficient utilization of water resources according to claim 1, characterized in that: The center lines of the water diversion open channel and the drainage open channel are curved in opposite directions.

6. The ecological reservoir interconnecting sluice for efficient utilization of water resources according to claim 1, characterized in that: The flow capacity of the sluice meets the following conditions: Take the water level in the ecological reservoir when a flood with a frequency of 50 years or more occurs and substitute it into the following formula for calculation: ， Among them, the lateral contraction coefficient ， ， ， Where Q is the flow rate through the gate (m 3 / s), b0—total net width of the lock chamber (m), H0—water head above the weir including the approaching flow velocity head (m), hs—downstream water depth from the gate bottom plate (m), g—gravitational acceleration, which can be 9.81 (m / s 2 ), σ—weir flow submergence coefficient, m—Weir flow coefficient, flat bottom gate m=0.385, d z —Thickness of the middle pier, b b - The distance between the edge line of the side gate pier in the direction of water flow and the water edge line of the upstream river channel, The flow capacity of the sluice is calculated. If the calculated flow is > the design flow, the newly built sluice meets the flow requirements.

7. The ecological reservoir interconnecting sluice for efficient utilization of water resources according to claim 1, characterized in that: The stability calculation of the sluice chamber shall meet the following conditions: The lock chamber stability calculation includes the anti-sliding stability calculation, the base stress calculation and the review of the ratio of the maximum stress to the minimum stress; (1) Working condition selection Working condition 1: Completed working condition, no water upstream and downstream of the gate. Working condition 2: water retaining condition, when the water level of the main reservoir upstream of the gate is not less than the flood level with a frequency of once in 50 years or more, there is no water downstream; (2) Calculation of chamber base stress ， In the formula, — Maximum and minimum stress values ​​of the chamber base (KN / m 2 ), —Total vertical load acting on the lock chamber, including buoyancy and uplift pressure acting on the base, KN, —The centroidal moment of all vertical and horizontal loads acting on the lock chamber on the bottom surface of the foundation perpendicular to the direction of water flow, KN·m, A—the area of ​​the bottom surface of the lock chamber (m 2 ), G—section moment of the bottom surface of the lock chamber with respect to the centroidal axis of the bottom surface (m 3 ), (3) Calculation of anti-sliding stability of the lock chamber: ， Where: kc—sluice chamber anti-sliding stability safety factor, f—friction coefficient between the base of the lock chamber and the soil foundation. According to the design specification table of sluice gates, the f value of the silt foundation can be taken as 0.

2. —All vertical loads acting on the lock chamber, including the uplift pressure on the base. The uplift pressure is temporarily calculated based on the unfavorable situation where no anti-seepage measures are taken. Unit: KN, —Total horizontal load acting on the lock chamber, unit: KN, The anti-sliding stability safety factor of the lock chamber section and the ratio of the maximum and minimum base stresses must meet the requirements of the "Water Gate Design Code" (SL265-2016).

8. A dispatching method for ecological reservoir interconnected sluice gates for efficient utilization of water resources based on any one of claims 1 to 7, characterized in that: The sluice gate operation and dispatching plan is as follows: the sluice gate is usually closed in normal times; when it rains, when the water level of the ecological reservoir rises to a level higher than the flood level with a frequency of once in 50 years or more, the sluice gate is opened; after the rain, when the water level of the ecological reservoir drops below the flood level with a frequency of once in 50 years or more, the sluice gate is closed; When a reservoir floods during the flood season, the main reservoir is dispatched according to the three-level control and discharge, specifically: (1) Before the flood season arrives, the main reservoir needs to lower its water level to the flood control limit water level, and use this water level as the flood control water level. The designed flood control water level is 3-5m lower than the flood level with a frequency of 50 years or more; (2) When the reservoir encounters a flood, if the water level in front of the main reservoir gate is less than or equal to the flood level of 0.6-1m with a frequency of once in 50 years or more, the reservoir adopts the first-level controlled discharge with a controlled discharge flow of 50m 3 / s; (3) If the water level in front of the main reservoir gate continues to rise after the first-level controlled discharge is adopted, when the water level in front of the main reservoir gate is greater than the flood level with a frequency of once in 50 years or more by 0.6--1m, but less than or equal to the flood level with a frequency of once in 50 years or more by 0.3--0.4m, the main reservoir shall implement the second-level controlled discharge, and the second-level controlled discharge flow is 100m 3 / s; (4) If the water level in front of the main reservoir gate continues to rise after the second-level controlled discharge is adopted, when the water level in front of the main reservoir gate is 0.3-0.4m higher than or less than the flood level with a frequency of once in 50 years or more, but lower than or equal to the flood level with a frequency of once in 50 years or more, the main reservoir will implement the third-level controlled discharge, and the third-level controlled discharge flow is 120m 3 / s; (5) When the water level in front of the main reservoir gate exceeds the flood level with a frequency of once in 50 years or more, the gates will be fully opened to discharge water.

9. The scheduling method according to claim 8, characterized in that: It also includes ecological reservoir scheduling, the ecological reservoir is also connected to two secondary ecological reservoirs with different directions, one of the secondary ecological reservoirs is provided with No. 1 sluice gate on its connecting channel, No. 1 sluice gate is the ecological reservoir interconnection control gate, water enters the ecological reservoir from the secondary ecological reservoir through No. 1 sluice gate, another secondary ecological reservoir is provided with No. 2 sluice gate on its connecting channel, No. 2 sluice gate is the ecological reservoir discharge gate, water is discharged from the ecological reservoir to the secondary ecological reservoir through No. 2 sluice gate, the interconnection sluice gate between the ecological reservoir and the main reservoir is called No. 3 sluice gate, No. 3 sluice gate is the ecological reservoir interconnection sluice gate for efficient utilization of water resources as described in any one of claims 1-7, specifically: Working condition 1: dry season When the incoming water is sewage from leakage during the dry season, the basin will lift the sewage to the municipal sewage system through the existing riverside sewage interception system, and it will not enter the ecological reservoir; Working condition 2: initial rain below 7mm When the initial rainfall of less than 7 mm occurs, the basin will transfer the initial rainfall of less than 7 mm to the flood discharge channel through the tunnel through the established independent sewage interception system, and it will not enter the ecological reservoir; or the initial rainfall of less than 7 mm will be abandoned to the municipal sewage system through the sewage interception system and upstream decentralized treatment facilities, and it will not enter the ecological reservoir; Working condition 3: 7mm or more, rainfall less than once in 50 years When rainfall of more than 7mm and less than once in 50 years occurs and the meteorological department issues a yellow or above rainstorm warning, the water level in the ecological reservoir will be controlled at the flood limit water level 1 by controlling the opening of No. 1 sluice, and the water level in the ecological reservoir will be controlled at the flood limit water level 2 by controlling the opening of No. 2 sluice, and the opening of No. 3 sluice will be closed; if the meteorological department does not issue a yellow or above rainstorm warning, the water level in the ecological reservoir will be controlled at the landscape water level 1 by controlling the opening of No. 1 sluice, and the water level in the ecological reservoir will be controlled at the landscape water level 2 by controlling the opening of No. 2 sluice, and No. 3 sluice will be closed; Working condition 4: rainfall with a return period of more than 50 years When rainfall occurs once in 50 years or more, No. 1 and No. 2 sluice gates are closed, and the flood in the secondary ecological reservoir exceeds the control water level and flows over the top of the overflow dam into the ecological reservoir. No. 3 sluice gate is opened, and the flood in the ecological reservoir enters the main reservoir and is discharged after being regulated by the main reservoir.

10. The scheduling method according to claim 9, characterized in that: The flood limit water level 1 is greater than the flood limit water level 2, and the landscape water level 1 is greater than the landscape water level 2.

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