Method and device for adjusting and controlling temperature of water discharged from river channel-type reservoir based on numerical simulation

Abstract

To provide a method and a device for adjusting and controlling temperature of water discharged from a river channel-type reservoir based on a numerical simulation.SOLUTION: A method for adjusting and controlling temperature of water discharged from a river channel-type reservoir based on a numerical simulation includes the steps of: processing actual measured data of a reservoir to be adjusted and controlled based on a predetermined numerical model to construct a water temperature numerical model; verifying reliability of the water temperature numerical model and using the verified water temperature numerical model to analyze effects of working conditions corresponding to various parameters such as the number of layers of drop gates, a drop time of the drop gates, and an arrangement form of the drop gates, on temperature of discharged water; and guiding adjustment and control of the temperature of the discharged water based on the analysis results. The method and device for adjusting and controlling temperature of discharged water clarify effects of the number of layers, operating time and arrangement form of the drop gates, on an increasing effect on temperature of discharged water, provide scientific guidance for adjustment and control of temperature of discharged water, contribute to improvement of a power generation efficiency, and provide a scientific basis for an ecological adjustment of a reservoir.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the technical field of ecological regulation of reservoirs, in particular to a method and device for regulating and controlling the temperature of discharge water from a river channel reservoir based on numerical simulation. [Background technology]

[0002] Water temperature is an important factor and the main regulating and controlling factor of physical, chemical and biological processes in river systems. The completion and operation of a large-scale reservoir brings great economic and social benefits to flood control, power generation, irrigation, water transportation, etc., but when water is stored in a reservoir, the spatial and temporal distribution of water temperature changes, and the surface area of ​​the reservoir is larger than that of a natural river channel, the water flow is slow and difficult to mix, and the storage time is long, and the heat exchange process at the water-air interface and the heat conduction process in the water area change, resulting in the water temperature structure in the reservoir being different from before storage, that is, the vertical water temperature in front of the dam of a large-scale reservoir has a water temperature stratification phenomenon, and the water temperature decreases with decreasing altitude. The temperature of the water after passing through the intake of the dam body or power plant and passing through the unit is called the temperature of the discharge water. The change in water temperature stratification of a reservoir depends on meteorological conditions, inflow water temperature, operation and management methods of the reservoir, the position and shape of the intake, the amount of water inflow and outflow, etc., so the water temperature distribution pattern is different for each reservoir.

[0003] The "cooling" and "heat storage" effects of river channel reservoirs become more noticeable after storage. The water inlet of a power plant is generally located in the deep water layer, and due to water temperature stratification, the temperature of the discharged water is likely to be lower than the natural environment in spring and summer, and higher than the natural environment in winter. Fish are the most evolved organisms in river ecosystems, and are often attracting attention due to their position in the ecosystem and their close relationship with human society. As fish are cold-blooded animals, they have a low ability to regulate and control their body temperature, and are easily affected by environmental water temperatures, so they are easily affected by water temperature changes. If the temperature of the discharged water is lower than the water temperature of the natural river channel, problems such as delayed fish reproduction, reduced spawning scale, and reduced survival rate of fish eggs are likely to occur. If the temperature of the discharged water is higher than the water temperature of the natural river channel, the growth period of fish will be extended, the development of the gonads will progress, and the sexual cycle may be disrupted before the second year's breeding season.

[0004] Regarding the phenomenon of thermal stratification in river channel reservoirs, the temperature of the bottom water is low and the temperature difference between the bottom water and the surface water is large, so that the traditional bottom water intake method can obtain low-temperature water, which may have adverse effects when it is discharged to the downstream ecological environment. In order to reduce this adverse effect, scholars at home and abroad have conducted numerous studies and compiled engineering and non-engineering measures to control the temperature of the discharged water. They are roughly divided into three categories: "stratified intake", "thermocline destruction", and "ecological regulation", among which, the stratified intake measure is widely used in China. Stratified intake is an effective means of controlling the temperature of the discharged water by controlling the intake position with the intake building, and compared with the traditional single-layer intake method, stratified intake can shorten the recovery distance of the low-temperature water area. There are various types of stratified water intake buildings that have been built or are under construction both in China and abroad. According to the characteristics of water flow, they can be classified into four types: overflow type intake (drop gate), multi-layer hole type intake, control curtain intake, and new water curtain intake, of which stratified water intake with drop gate is the most widely used.

[0005] The working principle of the drop gate is that when the water level rises, a series of gates will descend to block a certain area in front of the power plant's intake, and when the elevation of the power plant's intake moves from the intake to the top of the drop gate, stratifying the water temperature in the reservoir area, the upper layer of high-temperature water will be taken. After the drop gate is constructed, the water temperature monitoring data is used to calculate and analyze the effect of the drop gate's operation on the temperature of the water released from the power plant, and the optimization regulation of the stratified water intake by the drop gate is studied in detail, and the working effect of the drop gate is evaluated, which is of great importance to improving the ecological compensation mechanism and maintaining the ecological health of the river channel. In the conventional technology, the drop gate is mainly set in front of the intake, and the elevation of the top of the drop gate is increased to reduce the water depth at the top of the drop gate, so as to take as much surface water as possible and increase the temperature of the released water, but there are the following disadvantages: (1) The working time of the drop gate is not specified, which affects the power generation efficiency. (2) The actual effect of the drop gate configuration on the increase in the temperature of the discharged water was not taken into account, which affects the assessment of the ecological regulation effect of the reservoir. Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, in order to solve the technical problems described in the above background, the present invention provides a method and apparatus for regulating and controlling the temperature of discharge water from a river channel reservoir based on numerical simulation, which can clarify the influence of the operating time of the drop gate and its arrangement on the temperature increasing effect, scientifically guide the regulation and control of the temperature of the discharge water, contribute to improving the power generation efficiency, and provide a scientific basis for the ecological regulation of the reservoir. [Means for solving the problem]

[0007] In order to achieve the above objectives, the present invention provides the following technical solutions:

[0008] In a first aspect, an embodiment of the present invention provides a method for regulating and controlling a temperature of discharge water from a river channel reservoir based on a numerical simulation, comprising: A step of processing actual measurement data of the reservoir to be adjusted and controlled based on a preset numerical model to construct a water temperature numerical model; verifying the reliability of the water temperature numerical model, and using the verified water temperature numerical model to analyze the influence of working conditions corresponding to various parameters such as the number of layers of the drop gate, the drop time of the drop gate, and the arrangement of the drop gate on the temperature of the discharged water; and directing adjustment / control of the discharge water temperature based on the analysis results.

[0009] Preferably, the actual measurement data of the reservoir to be regulated and controlled includes topographical data, initial conditions, boundary conditions, and validation data.

[0010] Preferably, the process of processing actual measurement data of a reservoir to be regulated and controlled based on a preset numerical model comprises: According to a preset numerical model, the topographical data of the actual measured data of the reservoir to be adjusted and controlled is gridded and then interpolated to obtain gridded topographical data; Setting parameters of a preset numerical model according to the initial and boundary conditions.

[0011] Preferably, the process of verifying the reliability of the water temperature numerical model includes inputting verification data of actual measured data of the reservoir to be adjusted and controlled into the water temperature numerical model to obtain model calculation data, and comparing and analyzing the verification data with the actual measured data to verify the reliability of the water temperature numerical model.

[0012] Preferably, the operating conditions corresponding to the various parameters are set according to the single variable principle.

[0013] Preferably, the pre-defined numerical models include an EFDC numerical model, a MIKE numerical model, a FLUENT numerical model, and a DELFT3D numerical model.

[0014] In a second aspect, an embodiment of the present invention provides an apparatus for adjusting and controlling a temperature of discharge water from a river channel reservoir based on a numerical simulation, comprising: A construction module for processing actual measurement data of the reservoir to be adjusted and controlled based on a preset numerical model to construct a water temperature numerical model; an analysis module for verifying the reliability of the water temperature numerical model and analyzing the influence of working conditions corresponding to various parameters, such as the number of layers of the stopper gate, the drop time of the stopper gate, and the arrangement form of the stopper gate, on the temperature of the discharged water by using the verified water temperature numerical model; and a regulation and control module for directing regulation and control of the temperature of the discharge water based on the analysis results.

[0015] In a third aspect, an embodiment of the present invention provides a computing device including at least one processor and a memory communicatively connected to the at least one processor, the memory storing instructions executable by the at least one processor, the instructions being executed by the at least one processor to cause the at least one processor to perform a method for regulating and controlling a water temperature of discharge water from a river channel reservoir based on a numerical simulation as set forth in the first aspect of the embodiment of the present invention.

[0016] In a fourth aspect, an embodiment of the present invention provides a computer readable storage medium having stored thereon computer instructions for causing a computer to execute a method for regulating and controlling a temperature of discharge water from a river channel reservoir based on the numerical simulation according to the first aspect of the embodiment of the present invention. Effect of the Invention

[0017] The technical solution of the present invention has the following advantages:

[0018] The present invention provides a method and device for regulating and controlling the temperature of discharge water from a river channel reservoir based on a numerical simulation. The method includes the steps of: processing actual measurement data of the reservoir to be regulated and controlled based on a preset numerical model to construct a numerical model of water temperature; verifying the reliability of the numerical model of water temperature; analyzing the influence of working conditions corresponding to various parameters such as the number of layers of the drop gate, the drop time of the drop gate, and the layout of the drop gate on the temperature of the discharge water using the verified numerical model of water temperature; and guiding the regulation and control of the temperature of the discharge water based on the analysis result. The method and device for regulating and controlling the temperature of the discharge water according to the present invention clarify the influence of the number of layers, operation time, and layout of the drop gate on the increasing effect of the temperature of the discharge water, scientifically guiding the regulation and control of the temperature of the discharge water, contributing to the improvement of power generation efficiency, and providing a scientific basis for the ecological regulation of the reservoir. [Brief description of the drawings]

[0019] In order to more clearly describe certain embodiments of the present invention or the technical solutions of the prior art, the drawings necessary for the description of certain embodiments or the prior art are briefly introduced below, and it is clear that the drawings in the following description are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative efforts. [Figure 1] 1 is a schematic flow chart of a method for regulating and controlling the temperature of discharge water from a river channel reservoir based on a numerical simulation according to an embodiment of the present invention. [Diagram 2] FIG. 13 is a schematic diagram of a comparison between calculated and measured water levels according to an embodiment of the present invention. [Diagram 3] FIG. 13 is a schematic diagram showing a comparison result between calculated and measured values ​​of vertical water temperature in front of a dam according to an embodiment of the present invention. [Figure 4] FIG. 13 is a schematic diagram of the effect of the number of layers of drop gates on the temperature of the discharge water, according to an embodiment of the present invention. [Diagram 5] 4 is a schematic diagram of the effect of drop gate drop time on discharge water temperature according to an embodiment of the present invention. [Figure 6] FIG. 13 is a schematic diagram of the effect of stop gate configuration on discharge water temperature, according to an embodiment of the present invention. [Figure 7] FIG. 13 is a schematic diagram of the effect of stop gate configuration on vertical water temperature according to an embodiment of the present invention. [Figure 8] 1 is a module configuration diagram of an apparatus for adjusting and controlling the temperature of water released from a river channel type reservoir based on a numerical simulation according to an embodiment of the present invention. [Figure 9] FIG. 2 is a block diagram of an example of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] In order to allow those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the drawings in the embodiments of the present invention. However, it is clear that the described embodiments are only some of the embodiments of the present invention, not all of the embodiments, and do not limit the scope of the disclosure of the present invention. Furthermore, in the following description, the description of known configurations and techniques will be omitted so as not to unnecessarily confuse the concept of the present disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts should fall within the protection scope of the present invention.

[0021] Furthermore, the technical features according to different embodiments of the present invention described below may be combined with each other unless they are inconsistent with each other. Example 1

[0022] An embodiment of the present invention provides a method for adjusting and controlling the temperature of water discharged from a river channel reservoir based on a numerical simulation. As shown in Fig. 1, the method includes the following steps S1 to S3.

[0023] Step S1: Based on a preset numerical model, actual measurement data of the reservoir to be adjusted and controlled is processed to construct a numerical model of water temperature.

[0024] In addition, the water temperature simulation numerical model has undergone continuous improvement in vertical one-dimensional, vertical two-dimensional, and three-dimensional, and has undergone a development process from line to surface to body. The earliest vertical one-dimensional water temperature models are the WRE model and the MIT model, which have been applied to the Miyun Reservoir and the Giaheyan Reservoir in China. The vertical two-dimensional numerical model can simulate the vertical and vertical changes of water temperature, and can better simulate the characteristics of the formation and development of buoyancy flow and temperature stratification in the vertical direction, which is suitable for river channel reservoirs. The more mature vertical two-dimensional water temperature numerical model CE-QUAL-W2 is mainly used in river channel reservoirs such as Nuozhadu Reservoir and Xiluodu Reservoir. The three-dimensional water temperature numerical model can simulate the three-dimensional changes of the flow velocity field and temperature field of the reservoir, which is more suitable for actual engineering needs. For example, Chinese scholars have made many useful attempts and engineering applications of the three-dimensional water temperature numerical model in the Three Gorges Reservoir, Ahai Reservoir, Manwan Reservoir, etc. In this embodiment, the preset numerical models use three-dimensional water temperature numerical models, including EFDC numerical model, MIKE numerical model, FLUENT numerical model, and DELFT3D numerical model, which are used only as examples and are not limiting.

[0025] In this embodiment, the actual measurement data of the reservoir to be regulated and controlled includes topographical data, initial conditions, boundary conditions, and verification data. Specifically, the initial conditions include an artificially set initial water level and initial water temperature, which are set according to actual use needs. The boundary conditions include inflow flow rate, inflow water temperature, outflow flow rate, and meteorological data, among which the meteorological data includes data such as relative humidity, temperature, cloud cover, wind speed and wind direction in the area of ​​the reservoir to be regulated and controlled, which can be obtained from meteorological observation stations around the reservoir to be regulated and controlled. The verification data includes the water level before the dam and the vertical water temperature before the dam. In addition, when studying the water temperature stratification phenomenon in a river channel-type deep reservoir, it is necessary not only to consider the influence of factors such as wind and water surface heat flux on the stratification of the lake, but also to consider the influence of inflow and outflow on the heat balance of the water body and mixing caused by hydrodynamic processes. Therefore, in this embodiment, the specific setting of the actual measurement data of the reservoir to be regulated and controlled is used only as an example, not limited, and is adjusted according to actual needs.

[0026] In this embodiment, based on a preset numerical model, the topographical data of the actual measured data of the reservoir to be adjusted and controlled is gridded and interpolated to obtain grid-processed topographical data, and the parameters of the preset numerical model are set according to the initial conditions and boundary conditions to obtain a water temperature numerical model.

[0027] DELFT3D is a numerical model developed by the Netherlands Delta Institute that can simulate two-dimensional (depth-averaged) or three-dimensional unsteady flow of water temperature and its transport characteristics. In a specific embodiment, the process of constructing a water temperature numerical model using the DELFT3D numerical model is as follows:

[0028] 1. The RGFGRID submodule of the DELFT3D numerical model calculates and grids the study area. Specifically, it generates a visualized plane orthogonal curve grid, extracts the real terrain data, imports it into the boundary coordinates to generate boundary file data, and then draws the spline curve to generate a visualized plane orthogonal curve grid. It uses the QUICKIN submodule to perform elevation interpolation, and then uses trigonometric interpolation to diffuse the interior, interpolates the points into the polygon area, and then uses a diffusion algorithm to diffuse the interior points to the outside of the area, thereby giving each grid node the corresponding terrain data. Finally, it performs vertical gridding in combination with the size and centerline position of the intake, deep hole, and surface hole.

[0029] 2. After obtaining the initial conditions of the reservoir to be adjusted and controlled, i.e., the water level and water temperature of the entire area, and the boundary conditions determined from the actual operation data of the reservoir, i.e., both the upstream and downstream are flow rate boundaries, the parameters of DELFT3D are set to obtain the corresponding water temperature numerical model. Specifically, the DELFT3D parameters include Manning roughness coefficient, horizontal eddy viscosity coefficient, horizontal diffusion coefficient, gravitational acceleration, water density, air density, vertical eddy viscosity coefficient, and diffusion coefficient, but these are only used as examples, and the settings of specific parameters are adaptively adjusted according to the numerical model selected for actual use.

[0030] Step S2: Verify the reliability of the water temperature numerical model, and use the verified water temperature numerical model to analyze the effects of operating conditions corresponding to various parameters such as the number of layers of the drop gate, the drop time of the drop gate, and the arrangement form of the drop gate on the temperature of the discharge water.

[0031] In addition, to ensure that the water storage volume calculated by the numerical model of the reservoir to be regulated and controlled is consistent with the actual water storage volume, it is necessary to calculate the difference between the water level in front of the dam calculated by the numerical model and the actual water level in front of the dam to check the water storage volume. In addition, to verify the reliability of the calculation of the temperature of the discharged water, it is necessary to compare and analyze the calculated value of the vertical water temperature in front of the dam of the reservoir to be regulated and controlled with the measured value.

[0032] In this embodiment, the process of verifying the reliability of the water temperature numerical model includes inputting the actual measurement verification data of the reservoir to be regulated and controlled, including the water level before the dam and the vertical water temperature before the dam, into the water temperature numerical model to obtain model calculation data, and comparing and analyzing the verification data with the actual measurement data to verify the reliability of the water temperature numerical model. The reliability verification of the numerical model makes it possible to use the water temperature numerical model in the subsequent analysis and research of the temperature of the discharged water.

[0033] In practical application, the stratified water intake by the drop gate is to adjust the water depth at the top of the drop gate of the water inlet according to the change of the water level of the reservoir, and take as much surface water as possible from the reservoir, so as to increase the temperature of the discharged water. In this embodiment, the working conditions are set according to the single variable principle. The parameter variables included in the working conditions are the number of layers of the drop gate, the drop time of the drop gate, and the arrangement of the drop gate. These are used only as examples and are not limiting.

[0034] In addition, for river channel reservoirs where temperature stratification exists, stratified intake by stop gates is the most widely used means to adjust and control the temperature of discharge water, and in the prior art, stop gates are often installed at the intakes on either the left or right bank of the river channel. In the embodiment of the present invention, the arrangement of stop gates is considered comprehensively, that is, whether stop gates are installed on one side or both sides, and whether stop gates are installed at the intakes on both sides. The obtained arrangements include "double gates on one side", "no gate on one side", "average discharge water temperature", "double gate", "single gate", and "no gate". Specifically, "double gates on one side" and "no gate on one side" both refer to the working conditions when a stop gate is installed on one side, and each represents the arrangement of stop gates at the intakes on both sides under these working conditions. That is, "one-sided double gate" means that two layers of corner stop gates are provided in front of the water inlet on one side, and "one-sided no gate" means that no corner stop gate is provided in front of the water inlet on the opposite side under this working condition. "One-sided gate" means that a corner stop gate is provided only in front of the water inlet on one side, so the temperature of the discharge water from the corresponding water inlets on both sides is different, and therefore "average discharge water temperature" represents the average value of the temperature of the discharge water on both sides, that is, the average value of the temperature of the discharge water in the two cases of "one-sided double gate" and "one-sided no gate". "Double gate", "single gate", and "no gate" all correspond to the working condition when corner stop gates are provided on both sides, and respectively represent the working conditions when two layers of corner stop gates are provided in front of the water inlet on both sides, one layer of corner stop gates, and no corner stop gate are provided. The above arrangement forms are used only as examples and are adaptively adjusted according to actual needs.

[0035] Step S3: Based on the analysis results, guidance is given on adjusting and controlling the temperature of the discharged water.

[0036] In this embodiment, based on the above comparison, the effects of different numbers of layers of corner stoppers, drop times of the corner stoppers, and arrangements of the corner stoppers on the temperature of the discharge water are analyzed, and the adjustment and control of the temperature of the discharge water is scientifically guided based on the analysis results.

[0037] In a specific embodiment, for a river channel reservoir to be regulated and controlled where stratification exists, actual measurement data of the reservoir is collected, and the method for regulating and controlling the temperature of discharge water according to an embodiment of the present invention is carried out using the DELFT3D numerical model, and the process is as follows:

[0038] Step 1: Gridding is performed. Gridding is performed and calculated in the RGFGRID module of DELFT3D. In this embodiment, the number of grids in the M direction is 960, the number of grids in the N direction is 18, and the total number of grids is 17,280. Terrain interpolation is performed in the QUICKIN module of DELFT3D, and the vertical direction is divided into 16 layers.

[0039] Step 2: Set the parameters. From the collected reservoir measurement data, it can be seen that the water level in front of the dam varies in the range of 544.75-599.6 m. The initial water level and initial water temperature of the entire domain are given, with the initial water level being 589.91 m and the initial water temperature being 15°C. The upstream and downstream boundary conditions are given by the actual operating data of the reservoir and are not particularly restricted here. The parameters are set based on empirical values, with the Manning roughness coefficient being 0.035 and the horizontal eddy viscosity coefficient being 1 m. 2 / s, horizontal diffusion coefficient is 10m 2 / s, and the vertical eddy viscosity and diffusion coefficient are calculated using the KE model. The physical parameters are the gravitational acceleration of 9.81m / s 2 , the density of water is 1000 kg / m 3 , air density is 1kg / m 3There are various heat flux models in Delft3D, each with different levels of complexity and requiring different data inputs, so considering that the computational domain of the target reservoir is a large water body, the Ocean model is selected here, which requires input of relative humidity, temperature and cloud cover of the simulation domain, and the relevant data are obtained from a weather station.

[0040] Step 3: Verify the model. This includes verifying the water level and verifying the vertical water temperature before the dam. The specific verification results are shown in Figure 2 and Figure 3. As can be seen from Figure 2, the calculated value of the water level is consistent with the actual measured value, which better reflects the change trend of the actual water level, which suggests that the model basically follows the law of conservation of mass. As can be seen from Figure 3, the simulation result of the vertical water temperature before the dam more accurately reflects the formation and development process of water temperature stratification in the reservoir, which suggests that the mathematical model is reliable. In addition, the results in April, May, and June in Figure 2 verify that the water temperature stratification of the reservoir has seasonality. Based on this, examining the effect of the drop time of the drop gate on the temperature of the discharge water shows that the installation of the drop gate in the reservoir with water temperature stratification has practical engineering significance, can reduce the construction cost of the project, and has a certain degree of economic value.

[0041] Step 4: Set the working conditions. According to the number of layers of the drop gate, the drop gate's fall time, and the arrangement of the drop gate, the following different working conditions are set according to the single variable principle, and the details of the working conditions are shown in Table 1. Specifically, using working conditions 1, 2, and 3 in the table, the effects of different numbers of layers of the drop gate on the temperature of the discharge water are compared and analyzed. Note that, considering the operating costs of the actual project, only two-layer drop gates are exemplified here. The height of the top of one layer of the drop gate is 12m. Ignoring the impact on costs, theoretically, the more layers of the drop gate, the better. Using working conditions 1, 3, 4, and 5, the effects of the drop gate's fall time on the temperature of the discharge water are compared and analyzed. Using working conditions 1, 2, 3, 4, 5, and 6, the effects of the arrangement of the drop gate on the temperature of the discharge water are compared and analyzed.

[0042] Table 1. Details of working conditions JPEG2025009960000002.jpg73170

[0043] Step 5: Analyze the effect of the number of layers of the stop gate on the temperature of the discharge water. Figure 4 shows the effect of the number of layers of the stop gate on the temperature of the discharge water. From the figure, it can be seen that the temperature of the discharge water can be increased by installing a stop gate, but there is a limit to the improvement. Installing one layer of stop gate can increase the temperature of the discharge water by 0.1-0.3°C, and installing two layers of stop gate can increase the temperature of the discharge water by 0.1-0.4°C. This conclusion can be obtained from the numerical model. Note that the number of layers of the stop gate is used only as an example and is not limiting, and is determined according to the specific needs of the project.

[0044] Step 6: Analyze the effect of the operation time of the drop gate on the temperature of the discharge water. Figure 5 shows the effect of the drop time of the drop gate on the temperature of the discharge water. Note that the selection of the drop time of the drop gate is determined based on the analysis of the results of Figure 2, that is, to meet the seasonal time requirements of the water temperature stratification of the reservoir. From the figure, it can be seen that there is almost no difference in the effect on the temperature of the discharge water between the drop gate on March 16th and the drop gate on March 1st, and the drop gate on March 31st can increase the temperature of the discharge water by 0.05 to 0.1 degrees Celsius in a short period of time compared to the drop gate on March 16th, but the improvement effect gradually weakens over time, and ultimately the effect of increasing the temperature of the discharge water depending on the time of the drop gate is the same. Therefore, the operation of the drop gate can temporarily increase the temperature of the discharge water as needed.

[0045] Step 7: Analyze the effect of the arrangement of the stop gate on the temperature of the discharge water. Figure 6 shows the effect of the arrangement of the stop gate on the temperature of the discharge water. From the figure, it can be seen that under the condition that the total water flow rate is the same, the temperature of the discharge water in the case of "one-sided double gate" is 0.5-1°C higher than that in the case of "one-sided no gate", which suggests that the stratified water intake by the stop gate can improve the temperature of the discharge water to a certain extent. The temperature of the discharge water in the "one-sided double gate" is 0.05-0.3°C higher than that in the working condition of "double gate", the temperature of the discharge water in the "one-sided no gate" is 0.25-0.5°C lower than that in the working condition of "no gate", and the "average discharge water temperature" (average water temperature on both sides of both water inlets) is slightly higher (average about 0.05°C) than that in the working condition of both water inlets no gate, and slightly lower than that in the working condition of both water inlets single gate. From this, the arrangement of the stop gate has a great effect on the temperature of the discharge water, that is, only installing a stop gate in front of a part of the water inlet on one side does not have a great effect on the overall improvement of the temperature of the discharge water. To further explain the above phenomenon, Figure 7 shows the effect of the arrangement of the stop gate on the vertical water temperature in front of the water inlet and in front of the dam, where "one-sided gate" means that a stop gate is installed only in front of the water inlet on one side, and "no gate" means that no stop gate is installed. From the figure, in the case of "one-sided double gate", the vertical water temperature is higher overall than that in the case of "one-sided no gate", and the water temperature of the "non-gated water inlet", i.e., the water inlet without a gate, is between the two, which shows that the installation of a stop gate on one side increases the vertical water temperature on the gated side while decreasing the vertical water temperature on the non-gated side. The vertical water temperature on the non-gated side is lower than that when there are no stop gates on both sides. The water temperature of the upper water area "in front of the dam with a one-sided gate" was lower than "in front of the dam without a gate" (when no stop gate was installed), suggesting that the installation of a stop gate on one side lowers the water temperature in a specific area in front of the dam.

[0046] Step 8: Guide the regulation and control of the temperature of the discharge water based on the analysis results. Based on the above analysis results of the number of layers of the corner drop gate, it is found that, theoretically, the more layers of the corner drop gate, the better. From the analysis results of the drop gate's fall time, it is found that the effect of increasing the temperature of the discharge water is more significant when the corner drop gate is activated from mid to late March. From the analysis results of the arrangement form of the corner drop gate, it is found that the temperature of the discharge water is easily increased overall when the corner drop gate is installed in front of the intakes on both the left and right banks. Note that the regulation and control of the temperature of the discharge water of this reservoir is only one example. It is necessary to combine the reservoir to be actually regulated and controlled and use the method of this embodiment to analyze the effects of the number of layers of the corner drop gate, the fall time of the corner drop gate, and the arrangement form of the corner drop gate on the temperature of the discharge water, and dynamically regulate and control the temperature of the discharge water based on the analysis results.

[0047] The method for adjusting and controlling the temperature of discharge water from a river channel type reservoir based on the numerical simulation in an embodiment of the present invention involves setting various working conditions of the drop gate according to the single variable principle, comparing and analyzing the effects of various drop gate layers, drop gate drop times, and drop gate arrangement forms on the temperature of the discharge water, and adjusting and controlling the temperature of the discharge water of the reservoir based on the analysis results, which contributes to improving the power generation efficiency of the reservoir and provides a scientific basis for the ecological regulation of the reservoir. Example 2

[0048] An embodiment of the present invention provides an apparatus for regulating and controlling the temperature of discharge water from a river channel reservoir based on numerical simulation, which includes a construction module, an analysis module, and an adjustment and control module, as shown in FIG.

[0049] The construction module is used to process the actual measured data of the reservoir to be adjusted and controlled based on a preset numerical model, and to construct a water temperature numerical model. This module executes the method described in step S1 of Example 1, but will not be described in detail here.

[0050] The analysis module is used to verify the reliability of the water temperature numerical model, and use the verified water temperature numerical model to analyze the influence of the working conditions on the temperature of the discharge water for various parameters such as the number of layers of the drop gate, the drop time of the drop gate, and the arrangement form of the drop gate. This module implements the method described in step S2 of Example 1, which will not be described in detail here.

[0051] The adjustment and control module is used to guide the adjustment and control of the temperature of the discharge water based on the analysis results, and this module implements the method described in step S3 of Example 1, which will not be described in detail here.

[0052] The device for adjusting and controlling the temperature of water discharged from a river channel type reservoir based on a numerical simulation according to an embodiment of the present invention can simulate the temporal and spatial changes in the water temperature in the area to be adjusted and controlled, predict the effect of stratified water intake by drop gates, clarify the influence of the operating time and arrangement of the drop gates on the effect of increasing the temperature of the discharged water, and provide a scientific basis for the ecological regulation of the reservoir. Example 3

[0053] As shown in FIG. 9, the embodiment of the present invention provides a computer device including at least one processor 901, at least one communication interface 903, memory 904, and at least one communication bus 902, where the communication bus 902 is used to realize the connection and communication between these components, and the communication interface 903 may include a display screen and a keyboard, and the communication interface 903 may optionally include a standard wired interface and a wireless interface. The memory 904 may be a high-speed volatile random access memory, a non-volatile memory, or at least one storage device remote from the processor 901. The processor 901 can execute the method for adjusting and controlling the temperature of the discharge water from the river channel reservoir based on the numerical simulation in the first embodiment. The memory 904 stores a program code, and the processor 901 calls the program code stored in the memory 904 to execute the method for adjusting and controlling the temperature of the discharge water from the river channel reservoir based on the numerical simulation in the first embodiment.

[0054] The communication bus 902 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus 902 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one line is used in FIG. 9, but this does not mean that there is only one bus or only one type of bus.

[0055] The memory 904 may include volatile memory, such as random access memory (RAM), non-volatile memory, such as flash memory, a hard disk drive (HDD), or a solid-state drive (SSD), or may include a combination of the above memory types.

[0056] The processor 901 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP.

[0057] The processor 901 may further include a hardware chip. The above hardware chip may be an Application-Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The above PLD may be a Complex Programmable Logic Device (CPLD), a Field Programmable Gate Array (FPGA), a Generic Array Logic (GAL), or any combination thereof.

[0058] Optionally, the memory 904 is used for storing program instructions, and the processor 901 can call the program instructions to realize the method for regulating and controlling the temperature of discharge water from a river channel reservoir based on a numerical simulation, as in the first embodiment of the present invention.

[0059] An embodiment of the present invention further provides a computer readable storage medium having stored thereon computer executable instructions for performing the method of regulating and controlling the temperature of discharge water from a river channel reservoir based on a numerical simulation, where the storage medium may be a magnetic disk, an optical disk, a read only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD), a solid state drive (SSD), etc., or the storage medium may include a combination of the above types of memory.

[0060] Obviously, the above examples are merely examples for clear explanation, and are not intended to limit the embodiments. Those skilled in the art can make various other forms of changes or modifications based on the above description. A complete list of all embodiments is not necessary or possible. Any obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A method for adjusting and controlling the temperature of discharge water from a river channel reservoir based on a numerical simulation, comprising: A step of processing actual measurement data of a reservoir to be adjusted and controlled based on a preset numerical model to construct a water temperature numerical model, the actual measurement data of the reservoir to be adjusted and controlled includes topographical data, initial conditions, boundary conditions, and verification data, and the verification data includes a water level before the dam and a vertical water temperature before the dam; A step of performing reliability verification of the water temperature numerical model, including inputting the initial conditions and boundary conditions of the actual measurement data of the reservoir to be adjusted and controlled into the water temperature numerical model to obtain model calculation data, and comparing and analyzing the verification data with the actual measurement data to perform reliability verification of the water temperature numerical model, and using the verified water temperature numerical model to analyze the influence of working conditions corresponding to various parameters such as the number of layers of the drop gate, the drop time of the drop gate, and the arrangement form of the drop gate on the temperature of the discharge water, where the working conditions corresponding to the various parameters are set according to the single variable principle, and the arrangement form of the drop gate is based on whether the drop gate is installed on one side or both sides, and whether the drop gate is installed at the water intakes on both sides, including one-sided double gate, one-sided no gate, average discharge water temperature, double gate, single gate, and no gate; and directing adjustment and control of the temperature of the discharge water based on the analysis results.

2. The process of processing actual data of the reservoir to be adjusted and controlled based on a pre-defined numerical model is Based on a preset numerical model, gridding and then interpolating topographical data of the actual measured data of the reservoir to be adjusted and controlled to obtain gridded topographical data; The method for adjusting and controlling the temperature of water discharged from a river channel reservoir based on the numerical simulation according to claim 1, further comprising: setting parameters of a predetermined numerical model according to initial conditions and boundary conditions.

3. The method for adjusting and controlling the temperature of discharge water from a river channel reservoir based on a numerical simulation as described in claim 1, characterized in that the pre-set numerical models include EFDC numerical model, MIKE numerical model, FLUENT numerical model, and DELFT3D numerical model.

4. A device for adjusting and controlling the temperature of water discharged from a river channel reservoir based on a numerical simulation, comprising: A construction module for processing actual measurement data of a reservoir to be adjusted and controlled based on a preset numerical model to construct a water temperature numerical model, the actual measurement data of the reservoir to be adjusted and controlled including topographical data, initial conditions, boundary conditions, and verification data, and the verification data including a water level before a dam and a vertical water temperature before the dam; an analysis module for performing reliability verification of the water temperature numerical model, including inputting the initial conditions and boundary conditions of the actual measurement data of the reservoir to be adjusted and controlled into the water temperature numerical model to obtain model calculation data, and comparing and analyzing the verification data with the actual measurement data to perform reliability verification of the water temperature numerical model, and using the verified water temperature numerical model to analyze the influence of working conditions corresponding to various parameters of the number of layers of the drop gate, the drop time of the drop gate, and the arrangement form of the drop gate on the temperature of the discharge water, the parameters corresponding to the various working conditions are set according to the single variable principle, and the arrangement form of the drop gate is based on whether the drop gate is installed on one side or both sides, and whether the drop gate is installed at the water intakes on both sides, including one-sided double gate, one-sided no gate, average discharge water temperature, double gate, single gate, and no gate; and a regulation and control module for directing regulation and control of the temperature of the discharge water based on the analysis results.

5. A computer device comprising: at least one processor; and a memory communicatively connected to the at least one processor, the memory storing instructions executable by the at least one processor, the instructions being executed by the at least one processor to cause the at least one processor to execute a method for adjusting and controlling the temperature of water discharged from a river channel reservoir based on the numerical simulation described in any one of claims 1 to 3.

6. A computer-readable storage medium storing computer instructions for causing a computer to execute a method for adjusting and controlling the temperature of water discharged from a river channel reservoir based on the numerical simulation according to any one of claims 1 to 3.

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