CN103981832A - Method and system for urban small river ecological water compensation scheduling - Google Patents

Abstract

The present invention relates to a method and system for regulating ecological water supply in small urban rivers. The system includes a water supply source, a water supply pipeline connecting the river and the water supply source, a water supply pump on the water supply pipeline, and a water pump control cabinet corresponding to the water supply pump. A flow meter is set in the river downstream of the mouth, and the flow meter communicates with the water pump control cabinet to a central control machine. The supplementary water flow; the method is to use its system to adjust the river flow Q to be placed in the interval [0.8Qm, Qm] to ensure that the river is always under ecological conditions. This system and method overcomes the problems in the prior art that the quantity of supplementary water can be arbitrarily determined, resulting in a great waste of water resources and energy, and the problem that the operation cost is too high to be implemented; and some scheduling methods are cumbersome and technically difficult, and cannot be applied to small urban areas. The problem with the river.

Description

Method and system for ecological water replenishment scheduling of small urban rivers

technical field

The invention relates to the technical field of environmental protection and resource comprehensive utilization, in particular to an ecological water replenishment scheduling method and system for small urban rivers.

Background technique

While my country's economy is growing rapidly and urbanization has made remarkable achievements, due to people's excessive development and utilization of environmental resources, the ecological and environmental problems of urban rivers have become more and more prominent. serious. Especially for many seasonal rivers, the dry season has become the norm. Ecological replenishment of rivers is considered to be a practical and effective technical measure to solve the water environment problems of small urban rivers. However, in the existing ecological water replenishment system for small urban rivers, the determination of water replenishment amount and the operation of the water replenishment dispatching system are generally arbitrarily problematic. The water demand of the ecological environment of the river channel is simply superimposed and summed to obtain the water demand of the ecological environment of the river channel, which makes the calculated water demand of the ecological environment of the river channel larger than the actual required amount, resulting in a huge waste of water resources and energy, high operating costs, and difficult water replenishment dispatching system. To maintain but to be in name only.

CN101892647B discloses a river ecological flow scheduling method based on reservoir scheduling. In this method, firstly, the basic scheme, compromise scheme and ideal scheme of ecological flow management are established to suit the needs of high, medium and low water supply guarantee rates respectively, and Maintain the basic, good and ideal health status of the river ecosystem, and at the same time divide the storage space of the reservoir, corresponding to the above-mentioned ecological flow management plan from bottom to top; Combined to form a complete reservoir ecological operation plan; and then use the genetic algorithm to meet the basic constraints of the planned water supply guarantee rate, take reducing the disturbance of the river hydrological regime as the optimization goal, optimize the reservoir capacity partition, operation curve and other parameters, and get River ecological flow management scheme based on reservoir dispatching. This method involves division of reservoir inflow flow intervals. Various schemes need to be established for different inflow flow conditions. The dispatch curve involves many historical parameters, and the entire regulation method is cumbersome. The cost is too high for small urban rivers, and the dispatch depends on the reservoir. It is also not applicable to rivers without reservoir sources, and the applicability is low.

Contents of the invention

The object of the present invention is to provide a method and system for regulating ecological water replenishment of small urban rivers, which can automatically regulate the water replenishment flow of the river ecological water replenishment system, and solve the problem of waste of resources and cumbersomeness in existing dispatching methods.

A method for dispatching ecological water replenishment in urban small rivers, specifically:

Set up the water replenishment input point on the upper reaches of the river, and the water replenishment source supplies water to the river from the water replenishment input point through the water replenishment pipeline; the water replenishment pump is installed on the water replenishment pipeline as the water delivery power device, and the water pump control cabinet is installed corresponding to the water replenishment pump; at the downstream of the relative water replenishment input point A flow meter is set in the river in the direction; the flow meter communicates with the water pump control cabinet to a central control machine, and the central control machine regulates the delivery volume of the supplementary water pump through the water pump control cabinet, so as to regulate the supplementary water flow of the supplementary water input point to the river , so that the river flow Q is placed in the interval [0.8Qm, Qm],

Among them, Qm—target flow, Qm=W/t, in the formula: W—water demand of river ecological environment, t—calculation period;

Among them, W=Wzf+Wsl+Wss+max﹛Wjl, Wjg, Wzj﹜+W, where:

Wzf—river evaporation water demand; Wsl—river seepage water demand; Wss—river sediment transport water demand; Wjl—river ecological base flow; Wjg—river landscape environment water demand; Wzj—river dilution self-purification water demand; Water demand for external ecological environment;

The evaporation water demand Wzf of the river is calculated by the evaporation per unit area × water surface area;

The seepage water demand Wsl of the river is calculated by the seepage coefficient × the historical average water volume of the river;

The water demand Wss for river channel sediment transport is calculated from the average monthly sediment concentration over the years;

The river ecological base flow Wjl is calculated by the Tennant method;

The water demand Wjg of the river landscape environment is calculated by the Pavlovsky formula;

The diluted self-purification water demand Wzj of the river is calculated from the difference between the total load of current pollutants and the total load of target pollutants;

The water demand of the ecological environment outside the river course is calculated by the area quota method.

Further, according to whether there is a reservoir in the upper reaches of the river, two technical schemes for automatic regulation of ecological water replenishment are proposed.

Option One:

There is a reservoir in the upper reaches of the river, and the water supply input point includes a reservoir water supply point and a river water supply point. The water supply pipeline supplies water to the reservoir through the reservoir water supply point, and the reservoir supplies water to the river through the river water supply point. The river water supply point is set at the lowest ecological water level of the reservoir, and An electric control valve is installed at the water replenishment point of the river, and a liquid level switch is set for the reservoir. The flow meter and the liquid level switch are connected to a controller through a signal cable, and the controller is connected to the electric control valve through a control cable. The central control machine Through the GPRS network or 3G network, it communicates with the controller and the water pump control cabinet. The central control computer sends instructions to the water pump control cabinet and the controller according to the river flow Q and the reservoir water level H measured by the liquid level switch to regulate the reservoir water supply point and the river. The replenishment flow of the replenishment point includes the following regulation steps:

(a) Judging the water level H of the reservoir: when H=Hmax, the replenishment pump stops, and proceeds to step (b); when Hmin<H<Hmax, proceeds to step (b); when H≤Hmin, the electric control valve is closed, and the replenishment pump Start, repeat step (a);

(b) Judging the river flow Q: when Q < 0.8Qm, the electric control valve is opened, and then proceeds to step (a); the rest directly proceeds to step (c);

(c) When Q≥Qm, the electric regulating valve is closed, the replenishment pump is stopped, and the step (a) is transferred to; the rest are directly transferred to the step (a);

In the above steps, Hmax—the highest water storage level of the reservoir; Hmin—the lowest ecological water level of the reservoir, which are calculated by using the lake and reservoir shape analysis method.

Option II:

The water pump control cabinet is connected to a controller through a control cable, the central control machine is connected to the controller through a GPRS network or a 3G network, and the flow meter is connected to a remote I/O module through a signal cable. The O module communicates with the controller through the GPRS network or 3G network. The central control computer issues instructions to the pump control cabinet to regulate the delivery volume of the water pump according to the river flow Q measured by the flowmeter. The specific regulation steps are as follows:

(a) Judgment of river flow Q: when Q<0.8Qm, the replenishment pump starts, the river begins to replenish water, and proceeds to step (b); the rest repeat step (a);

(b) When Q<Qm, the water replenishment pump is running, and the river replenishment continues, and step (b) is repeated; when Q≥Qm, the replenishment pump is stopped, and the river replenishment is stopped, and then proceed to step (a).

The key parameter of this method is the river flow Q, and the real-time detection value is fed back to the central control machine through the flow meter in the dispatching system. The control of the water pump control cabinet achieves the purpose of adjusting the water flow of the supplementary pump, and then controls the river flow Q within a certain interval [0.8Qm, Qm] to ensure that the river is always under ecological conditions. This method makes a reasonable choice in the calculation of the water demand W of the ecological environment of the river course, and overcomes the arbitrary determination of the water replenishment amount in the prior art.

It caused a huge waste of water resources and energy, and the operation cost was too high to be implemented; and some scheduling methods were cumbersome, the control conditions were complicated, and the technical difficulty was high, so it could not be applied to small urban rivers.

Furthermore, in view of the situation where there is a reservoir in the upper reaches of the river, the water replenishment point of the river is set at the lowest ecological water level of the reservoir. While regulating the flow Q of the river, the ecological environment of the reservoir is guaranteed. For the case where there is no reservoir in the upper reaches of the river, the entire regulation structure is simple and effective, and a single regulation of the river flow Q is realized.

In addition, the present invention also provides an ecological water replenishment scheduling system for small urban rivers, which includes a water replenishment source, a replenishment pipe connecting the river and the replenishment source, a replenishment pump on the replenishment pipe, and a water pump control cabinet corresponding to the replenishment pump. A flow meter is arranged in the river downstream of the output port, and the flow meter communicates with the water pump control cabinet and is connected to a central control machine.

Further, the river includes a reservoir upstream thereof, the output end of the replenishment pipeline is set corresponding to the reservoir, a liquid level switch is arranged in the reservoir, and the liquid level switch is connected to a controller; The reservoir discharge port is provided with an electric regulating valve, and the flow meter is arranged in the river in the downstream direction relative to the reservoir discharge port. The electric regulating valve and flow meter are connected to a controller, and the controller is connected to the central control machine communication connection.

The flow meter of this dispatching system is used as the signal acquisition device of the system to provide the control basis for the control core central control machine, and the central control machine then controls the water pump control cabinet to replenish water. The system structure is simple and reasonable, and the required hardware devices are mature and easy to implement. , can timely and effectively replenish water scheduling. And for the structure of the reservoir in the upper reaches of the river, a liquid level switch is added to obtain the water level of the reservoir. The central control unit combines the flow of the river and the water level of the reservoir to realize the unified dispatch of the reservoir and the river, and ensure that the two are under ecological conditions to the greatest extent. In addition, at the lowest ecological water level of the reservoir, there is a reservoir outlet for replenishing water to the river as a river replenishment point, which is conducive to water exchange in the lower layer of the reservoir and ensures the ecological environment of the reservoir.

Description of drawings

Fig. 1 is a kind of scene structural diagram of dispatching method of the present invention;

Fig. 2 is a control frame diagram corresponding to the site structure diagram shown in Fig. 1;

Fig. 3 is the control flowchart corresponding to the field structure diagram shown in Fig. 1;

Fig. 4 is another kind of on-site structural diagram of the scheduling method of the present invention;

Fig. 5 is a control frame diagram corresponding to the site structure diagram shown in Fig. 4;

Fig. 6 is the control flowchart corresponding to the field structure diagram shown in Fig. 4;

Fig. 7 is a graph showing the relationship between the lake water level and the rate of change of the water surface area used to calculate the minimum ecological water level Hmin of the reservoir in the present invention.

Explanation of reference signs: 1-central control machine; 2-controller; 3-liquid level switch; 4-electric control valve; 5-flow meter; 6-water pump control cabinet; -Remote I/O module.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Embodiment one:

When there is a reservoir in the upper reaches of the river, set it up as shown in Figure 1. The reservoir outlet is placed at the lowest ecological water level Hmin of the reservoir. The reservoir outlet is used as a river replenishment point, and an electric regulating valve 4 is installed at the reservoir outlet to regulate the reservoir. Amount of make-up water released into the river. The water supply source supplies water to the reservoir through the water supply pipeline 8, and the output end of the water supply pipeline 8 to the reservoir is the reservoir water supply point, and the water supply pipeline 8 is provided with a water supply pump 7 as a water delivery power device, and a water pump control cabinet 6 is provided to control the water supply pump 7 running. Set flow meter 5 in the river downstream relative to the water supply input point to measure the river flow Q, set liquid level switch 3 for the reservoir to detect the water level H of the reservoir in real time, flow meter 5 and liquid level switch 3 pass the detection signal through the signal cable It is sent to a controller 2, and the controller 2 controls the opening degree of the electric regulating valve 4 through a control cable.

A control room is provided for the above-mentioned device, which is used to place the central control machine 1 . The central control computer 1 realizes remote communication with the controller 2 and the water pump control cabinet 6 through the GPRS network or 3G network. As shown in Figure 2, the reservoir water level H and the river flow Q are obtained in real time. Water level Hmax, the minimum ecological water level Hmin of the reservoir and the target flow Qm parameters, the central control machine 1 enters the control program according to the flow chart shown in Figure 3, that is, it is regulated according to the following steps:

(a) Judging the water level H of the reservoir: when H=Hmax, the replenishment pump 7 stops, and proceeds to step (b); when Hmin<H<Hmax, proceeds to step (b); when H≤Hmin, the electric control valve 4 is closed, Make up water pump 7 starts, repeat step (a);

(b) Judging the river flow Q: when Q<0.8Qm, the electric control valve 4 is opened, and then proceeds to step (a); the rest directly proceeds to step (c);

(c) When Q≥Qm, the electric regulating valve 4 is closed, the supplementary water pump 7 is stopped, and the process goes to step (a); the rest directly goes to step (a).

Since this example includes two water replenishment points, the reservoir water replenishment point and the river water replenishment point, it is necessary to combine the river flow Q and the reservoir water level H to jointly control the replenishment flow. In the case of ensuring the reservoir water level H, when the river flow Q is lower than 0.8Qm, trigger The river is replenished with water until the river flow Q reaches Qm. This will not only ensure that the water level H of the reservoir will not be lower than its minimum ecological water level Hmin, so as to ensure the ecological environment of the reservoir, but also facilitate the exchange of water in the lower layer of the reservoir.

Embodiment two:

When there is no reservoir in the upper reaches of the river, its setting is relatively simple. As shown in Figure 4, the water replenishment input point is set in the upper reaches of the river, and the output end of the water replenishment pipeline 8 to the river is the water replenishment input point. Same as the first embodiment, a water replenishment pump 7 is installed on the water replenishment pipeline 8 as a water delivery power device, and a water pump control cabinet 6 is provided to control the operation of the water replenishment pump 7 . The difference is that a controller 2 is set as an information transfer station, the pump control cabinet 6 is connected to the controller 2 through a control cable, and the flow meter 5 is connected to a remote I/O module 9 through a signal cable to transmit the flow information to the controller 2 first , between the central control machine 1 and the controller 2, and between the controller 2 and the remote I/O module 9 can also be connected by a GPRS network or a 3G network, as shown in FIG. 5 . Similarly, the target flow Qm parameter is set in advance in the central control machine 1, and the central control machine 1 enters the control program according to the flow chart shown in Figure 6, that is:

(a) Judging the river flow Q: when Q＜0.8Qm, the replenishment pump 7 starts, and the river begins to replenish water, and proceeds to step (b); all the other repeat step (a);

(b) When Q<Qm, the replenishment pump 7 runs, and the river replenishment continues, and step (b) is repeated; when Q≥Qm, the replenishment pump 7 stops, and the river replenishment stops, and proceeds to step (a).

When the river flow Q is lower than 0.8Qm, the river replenishment program is triggered until the river flow Q reaches Qm, and a replenishment cycle is completed. For the convenience of scheduling, a frequency converter is installed in the water pump control cabinet 6 to adjust the speed of the water replenishment pump 7 to achieve the purpose of adjusting the water replenishment flow.

Because the present invention is aimed at the situation that the river needs water replenishment, it is not within the regulation and control scope of the scheme for the period of sufficient water volume of the river or even the flood period. The supplementary water source in the present invention can be taken from adjacent rivers with relatively abundant water resources or tail water from urban sewage treatment plants that meet the supplementary water quality conditions.

The purpose of the present invention is to place the river flow Q in the interval [0.8Qm, Qm] to ensure the minimum flow requirement required by the river ecological environment. Among them, Qm is the target flow, which is calculated by the formula "Qm=W/t", where: W is the water demand of the river ecological environment, and t is the calculation period;

Further, the W value is calculated by the formula "W=Wzf+Wsl+Wss+max﹛Wjl, Wjg, Wzj﹜+W", where:

Wzf—river evaporation water demand; Wsl—river seepage water demand; Wss—river sediment transport water demand; Wjl—river ecological base flow; Wjg—river landscape environment water demand; Wzj—river dilution self-purification water demand; Water demand for external ecological environment.

The main function of the river is to meet the requirements of aquatic biological habitat, landscape, dilution and self-purification, sediment transport, and water demand for the ecological environment outside the river. The river flow Q should be able to meet the needs of the above functions at the same time. For the water demand W of the ecological environment of the river course, since there are often overlaps and overlaps between the above sub-items, superimposing and summing each sub-item will make the calculation result too large and unreasonable. Therefore, for the values of Wjl, Wjg, and Wzj that overlap significantly, the method of taking the maximum value is used to solve the problem of repeated calculation.

The above values are obtained according to the prior art, as follows:

The evaporation water demand Wzf of the river is calculated by the evaporation per unit area × water surface area, and the evaporation of the river basin is determined through experiments; the water demand Wsl of the river seepage is calculated by the seepage coefficient × the historical average water volume of the river, and the seepage coefficient is based on the underlying surface of the river Determined; the river channel sediment transport water demand Wss is calculated from the average monthly sediment concentration over the years, and the monthly sediment concentration data of the river can be obtained from the local hydrological bureau; the ecological base flow Wjl of the river channel is calculated by the Tennant method, which is determined according to the actual situation of the river. Percentage of flow; water demand Wjg for river landscape environment is calculated by Pavlovsky formula, and this value can be ignored when the river landscape function is not significant; water demand Wzj for river dilution and self-purification is determined by the total load of current pollutants and the total target pollutants. This value can be ignored when there are good point and non-point source pollution control measures along the river; the water demand for the ecological environment outside the river is calculated by the area quota method, mainly for the vegetation outside the river. water volume.

For the highest water storage level Hmax of the reservoir and the lowest ecological water level Hmin of the reservoir also involved in the first embodiment. The maximum water storage level Hmax of the reservoir is determined by the design storage capacity of the reservoir, and its value can be obtained from the local reservoir management department. The minimum ecological water level Hmin of the reservoir is the lowest water level to maintain the ecosystem of the reservoir without serious degradation, and the adjustable storage capacity of the reservoir is between the minimum ecological water level and the highest water storage level. The minimum ecological water level Hmin of the reservoir can be calculated by using the lake and reservoir shape analysis method. The specific calculation method is to use the measured water level of the lake and the corresponding water surface area data to establish the relationship curve between the lake water level and the water surface area change rate, as shown in Figure 7, when the maximum value of the lake surface area change rate is A, it corresponds to the water level value B, here The water level value B at time is the lowest ecological water level of the reservoir.

In addition, the present invention also provides an ecological water supply scheduling system for small urban rivers. The above two method embodiments are based on this system, which includes a water supply source, a water supply pipeline 8 connecting the river and the water supply source, and a water supply pump on the water supply pipeline 8. 7 The water pump control cabinet 6 corresponding to the water replenishment pump 7 is provided with a flow meter 5 in the river downstream of the outlet of the water replenishment pipeline 8, and the flow meter 5 and the water pump control cabinet 6 are communicatively connected to a central control machine 1. The flow meter 5 of the dispatching system is used as the signal acquisition device of the system, and provides the control basis for the central control machine 1 of the control core, and the central control machine 1 further controls the water supply by controlling the water pump control cabinet 6 .

For method embodiment one, since the river includes a reservoir upstream of it, its corresponding system is further: the output end of the water supply pipeline 8 is set corresponding to the reservoir, and a liquid level switch 3 is set in the reservoir to obtain the water level of the reservoir, the liquid level The switch 3 is connected with a controller 2; the lowest ecological water level of the reservoir is provided with a reservoir outlet for replenishing water to the river, the reservoir outlet is provided with an electric regulating valve 4, and the flow meter 5 is arranged in the river in the downstream direction relative to the reservoir outlet, The electric regulating valve 4 and the flowmeter 5 are connected with the controller 2, and the controller 2 is communicated with the central control machine 1, and the central control machine 1 combines the flow of the river and the water level of the reservoir to realize the unified dispatch of the reservoir and the river, and At the lowest ecological water level of the reservoir, there is a reservoir outlet to replenish water to the river as a river water replenishment point, which is conducive to water exchange in the lower water body of the reservoir and ensures that both are under ecological conditions to the greatest extent.

Claims (5)

1. A kind of urban small-scale river ecological replenishment dispatching method, it is characterized in that: Set up the water replenishment input point on the upper reaches of the river, and the water replenishment source supplies water to the river from the water replenishment input point through the water replenishment pipeline; the water replenishment pump is installed on the water replenishment pipeline as the water delivery power device, and the water pump control cabinet is installed corresponding to the water replenishment pump; at the downstream of the relative water replenishment input point A flow meter is set in the river in the direction; the flow meter communicates with the water pump control cabinet to a central control machine, and the central control machine regulates the delivery volume of the supplementary water pump through the water pump control cabinet, so as to regulate the supplementary water flow of the supplementary water input point to the river , so that the river flow Q is placed in the interval [0.8Qm, Qm], Among them, Qm—target flow, Qm=W/t, in the formula: W—water demand of river ecological environment, t—calculation period; Among them, W=Wzf+Wsl+Wss+max﹛Wjl, Wjg, Wzj﹜+W, where: Wzf—river evaporation water demand; Wsl—river seepage water demand; Wss—river sediment transport water demand; Wjl—river ecological base flow; Wjg—river landscape environment water demand; Wzj—river dilution self-purification water demand; Water demand for external ecological environment; The evaporation water demand Wzf of the river is calculated by the evaporation per unit area × water surface area; The seepage water demand Wsl of the river is calculated by the seepage coefficient × the historical average water volume of the river; The water demand Wss for river channel sediment transport is calculated from the average monthly sediment concentration over the years; The river ecological base flow Wjl is calculated by the Tennant method; The water demand Wjg of the river landscape environment is calculated by the Pavlovsky formula; The diluted self-purification water demand Wzj of the river is calculated from the difference between the total load of current pollutants and the total load of target pollutants; The water demand of the ecological environment outside the river course is calculated by the area quota method. 2. the urban small-scale river ecological replenishment dispatching method according to claim 1, is characterized in that: There is a reservoir in the upper reaches of the river, and the water supply input point includes a reservoir water supply point and a river water supply point. The water supply pipeline supplies water to the reservoir through the reservoir water supply point, and the reservoir supplies water to the river through the river water supply point. The river water supply point is set at the lowest ecological water level of the reservoir, and An electric control valve is installed at the water replenishment point of the river, and a liquid level switch is set for the reservoir. The flow meter and the liquid level switch are connected to a controller through a signal cable, and the controller is connected to the electric control valve through a control cable. The central control machine Through the GPRS network or 3G network, it communicates with the controller and the water pump control cabinet. The central control computer sends instructions to the water pump control cabinet and the controller according to the river flow Q and the reservoir water level H measured by the liquid level switch to regulate the reservoir water supply point and the river. The replenishment flow of the replenishment point includes the following regulation steps: (a) Judging the water level H of the reservoir: when H=Hmax, the replenishment pump stops, and proceeds to step (b); when Hmin<H<Hmax, proceeds to step (b); when H≤Hmin, the electric control valve is closed, and the replenishment pump Start, repeat step (a); (b) Judging the river flow Q: when Q < 0.8Qm, the electric control valve is opened, and then proceeds to step (a); the rest directly proceeds to step (c); (c) When Q≥Qm, the electric regulating valve is closed, the replenishment pump is stopped, and the step (a) is transferred to; the rest are directly transferred to the step (a); In the above steps, Hmax—the highest water storage level of the reservoir; Hmin—the lowest ecological water level of the reservoir, which are calculated by using the lake and reservoir shape analysis method. 3. the urban small-scale river ecological replenishment dispatching method according to claim 1, is characterized in that: The water pump control cabinet is connected to a controller through a control cable, the central control machine is connected to the controller through a GPRS network or a 3G network, and the flow meter is connected to a remote I/O module through a signal cable. The O module communicates with the controller through the GPRS network or 3G network. The central control computer sends instructions to the water pump control cabinet to regulate the delivery volume of the water pump according to the river flow Q measured by the flowmeter. The specific regulation steps are as follows: (a) Judgment of river flow Q: when Q<0.8Qm, the replenishment pump starts, the river begins to replenish water, and proceeds to step (b); the rest repeat step (a); (b) When Q<Qm, the water replenishment pump is running, and the river replenishment continues, and step (b) is repeated; when Q≥Qm, the replenishment pump is stopped, and the river replenishment is stopped, and then proceed to step (a). 4. A kind of urban small-scale river ecological replenishment dispatching system, comprises replenishment water source, the replenishment pipeline that connects river and replenishment source, the replenishment pump on the replenishment pipeline and the water pump control cabinet corresponding to replenishment pump, it is characterized in that: in relative replenishment pipeline outlet A flow meter is arranged in the downstream direction of the river, and the flow meter communicates with the water pump control cabinet and is connected to a central control machine. 5. The urban small-scale river ecological replenishment dispatching system according to claim 4, characterized in that: the river includes a reservoir upstream thereof, the output end of the replenishment pipeline corresponds to the reservoir setting, and a liquid level switch is arranged in the reservoir, and the liquid The position switch is connected with a controller; the reservoir outlet for replenishing water to the river is set at the lowest ecological water level of the reservoir, the reservoir outlet is provided with an electric regulating valve, and the flow meter is arranged in the river downstream of the reservoir outlet. The regulating valve and the flow meter are connected with the controller, and the controller is connected with the central control machine in communication.