Siltation dam water resource potential tapping method based on rainfall-water storage dynamic response

Abstract

The invention discloses a silt dam water resource potential tapping method based on rainfall-water storage dynamic response, and relates to the field of water resource efficient utilization and water and soil conservation, and the method comprises the steps: obtaining geological parameters, reservoir area parameters and meteorological parameters of a silt dam; setting different artificial permeable body areas, and calculating potential tapping volumes under different artificial permeable body areas according to the geological parameters, the reservoir area parameters and the meteorological parameters to obtain a potential tapping volume simulation result of the silt dam; and according to the potential tapping quantity simulation result, the optimal proportion of the improved aquifer based on the artificial permeable body is analyzed, and the artificial permeable body is arranged on the silt dam based on the optimal proportion. The evaporation loss of the silt dam is reduced, the supply amount of underground water is increased, and the water resource utilization rate of the silt dam is effectively increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of efficient utilization of water resources and soil and water conservation, and more particularly to a silt dam water resource tapping method based on rainfall-water storage dynamic response. BACKGROUND

[0002] In the typical arid and semi-arid region of the Loess Plateau, the annual rainfall is less and the annual evaporation is high, the evaporation is several times or even ten times of the rainfall, and the groundwater depth is deep. As the core project of water and soil conservation in this region, although the silt dam has the functions of sand interception and water storage, under the large difference between rainfall and evaporation, a large amount of stored rainfall is evaporated, the water resource potential has not been effectively tapped and utilized, and there is a problem of insufficient water resource utilization efficiency.

[0003] Specifically, the silt dam water storage is intermittent, and the silt layer is mostly silty clay with weak permeability, and the water storage is easy to form "dead water", a large amount of water is consumed by ineffective evaporation, and cannot be converted into available water resources, resulting in large evaporation loss of intermittent water storage of silt dam. Especially the low permeability of the silt layer hinders the infiltration of the stored water to the underground aquifer, resulting in weak groundwater recharge capacity and insufficient groundwater recharge, further exacerbating the regional water resource supply and demand contradiction. And the existing technology focuses on the interception of silt dam to surface runoff, and does not design targeted intervention measures according to the rainfall-water storage dynamic response characteristics, so it is difficult to realize the efficient conversion of water storage to groundwater or reusable water resources.

[0004] Therefore, in view of the high evaporation loss and low water resource utilization rate of the silt dam, how to improve the silt dam to tap the regional water resource potential is a problem to be solved by those skilled in the art. SUMMARY

[0005] Therefore, the present application provides a silt dam water resource tapping method based on rainfall-water storage dynamic response to solve the above problems.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: The present application discloses a silt dam water resource tapping method based on rainfall-water storage dynamic response, comprising: obtaining geological parameters, reservoir parameters and meteorological parameters of the silt dam; setting different artificial water permeable body areas, and calculating the tapping amount under different artificial water permeable body areas according to the geological parameters, the reservoir parameters and the meteorological parameters, to obtain a silt dam tapping potential simulation result; According to the tapping potential simulation result, the best proportion of the improved aquifer based on the artificial water permeable body is analyzed, and the artificial water permeable body is set in the silt dam based on the best proportion.

[0007] Further, the geological parameters include: a permeability coefficient of the silt dam silt layer and a permeability coefficient of the bedrock permeable layer. The soil samples at different depths of the silt dam silt layer are collected, and the soil infiltration test is performed to determine the permeability coefficient of the silt layer; and according to the stratum data of the silt dam, the permeability coefficient of the bedrock permeable layer under the silt layer is determined.

[0008] Further, the reservoir area parameters include: reservoir area water depth data, reservoir area surface water storage time and reservoir area water surface area. The reservoir area water depth data is obtained by a radar water level gauge; the reservoir area surface water storage time is obtained according to the reservoir area water depth data; and the reservoir area water surface area is an average accumulated water area within the reservoir area surface water storage time.

[0009] Further, the meteorological parameters are precipitation and evaporation data of the area where the silt dam is located.

[0010] Further, the potential tapping amount is calculated by the following way: First, the comprehensive permeability coefficient of the reservoir area is calculated according to the area of the artificial permeable body, the permeability coefficient of the bedrock permeable layer, the reservoir area water surface area and the permeability coefficient of the silt layer. Then, the reservoir area surface water storage improvement time after adding the artificial permeable body is calculated according to the reservoir area surface water storage time, and the ratio of the permeability coefficient of the silt layer to the comprehensive permeability coefficient. Finally, the invalid evaporation amount is calculated as the potential tapping amount according to the difference between the reservoir area surface water storage time and the reservoir area surface water storage improvement time, the reservoir area water surface evaporation intensity and the reservoir area water surface area.

[0011] Further, the calculation formula of the comprehensive permeability coefficient is: ; Wherein, K is the comprehensive permeability coefficient, K1 is the permeability coefficient of the bedrock permeable layer, K2 is the permeability coefficient of the silt layer, S is the area of the artificial permeable body, A is the reservoir area water surface area. The calculation formula of the reservoir area surface water storage improvement time is: ; Wherein, T is the reservoir area surface water storage improvement time, T0 is the reservoir area surface water storage time. The calculation formula of the potential tapping amount is: ; Wherein, To tap the potential, To water surface evaporation intensity.

[0012] Further, the artificial water-permeable body specifically comprises: an artificial water-permeable body composed of gravel, pebbles and coarse sand is arranged in the silt dam silt layer, the artificial water-permeable body penetrates through the silt layer and reaches the underlying bedrock water-permeable layer, forming a surface-to-deep penetrating seepage channel.

[0013] Further, it also comprises: based on the SWAT model or the Infoworks ICM model, simulating the infiltration, evaporation and surface outflow of the silt dam area under different water-permeable body configurations in the future period of time, and optimizing the water-permeable body layout.

[0014] Further, it also comprises: an underground water collection gallery is arranged downstream of the artificial water-permeable body to collect the infiltrated water and introduce it into the dam pool through a siphon pipe.

[0015] Through the above technical solution, compared with the prior art, the present application provides a silt dam water resource tapping method based on rainfall-water storage dynamic response, which accelerates water storage infiltration through an artificial water-permeable body, shortens the retention time of "dead water", significantly reduces the loss of ineffective evaporation, and improves the utilization efficiency of water storage; and the water-permeable body penetrates through the silt layer to the bedrock aquifer, directly opening up the seepage channel of water storage to groundwater, significantly improving the groundwater recharge, strengthening groundwater recharge and improving the regional groundwater environment; at the same time, the supporting water collection system realizes the recycling of infiltrated water resources, and the intelligent control adapts to different rainfall scenarios, so that the utilization rate of silt dam water resources is significantly improved. The present application reduces the evaporation loss of silt dam, improves the groundwater recharge, and effectively improves the water resource utilization rate of silt dam. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without creating any inventive labor.

[0017] Figure 1 The overall flowchart provided by the present application.

[0018] Figure 2 The silt dam water volume tapping ratio change diagram provided by the present application.

[0019] Figure 3 The setting diagram of the artificial water-permeable body in the silt dam provided by the present application. DETAILED DESCRIPTION

[0020] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of the present application.

[0021] The embodiments of the present application disclose a silt dam water resource potential tapping method based on rainfall-water storage dynamic response, as shown in the formula (1), comprising the steps of: Figure 1 obtaining geological parameters, reservoir area parameters and meteorological parameters of the silt dam; setting different artificial water permeable body areas, and calculating tapping amounts under different artificial water permeable body areas according to the geological parameters, reservoir area parameters and meteorological parameters to obtain silt dam potential tapping simulation results; According to the potential tapping simulation results, the best proportion of the improved aquifer based on the artificial water permeable body is analyzed, and the artificial water permeable body is set in the silt dam based on the best proportion.

[0022] In a specific embodiment, the geological parameters include the permeability coefficient of the silt dam silt layer and the permeability coefficient of the bedrock water permeable layer. Collect soil samples of different depths of the silt dam silt layer, and perform soil infiltration testing to determine the permeability coefficient of the silt layer; according to the stratum data of the silt dam, the permeability coefficient of the bedrock water permeable layer under the silt layer is determined.

[0023] Specifically, taking a certain silt dam in a certain area as a research area, soil samples of different depths of the silt dam silt layer are collected, and indoor testing is performed on the prepared samples to test the soil permeability coefficient under different density and particle size conditions, as shown in Table 1. The test results show that the greater the porosity, the stronger the soil infiltration capacity, and the smaller the dry density, the stronger the soil permeability. As shown in Table 1, the soil permeability coefficient K in the soil depth range is 0.0387 m / d, and the permeability coefficient of silty clay is in the range of 0.005-0.05 m / d, which is within the range of the permeability coefficient of silty clay. From August 1, 2019 to August 1, 2020, the total water depth is 2.9195 m, and the total water accumulation days from August 2019 to August 2020 are 72 days. The silt layer water is completely infiltrated, and the infiltration depth is 2.7836 m, and the calculated permeability coefficient is 0.03866 m / d. Compared with the measured value, the calculation error is 4.65%. Therefore, the permeability coefficient can be used as the silt layer coefficient.

[0024] Table 1 Physical properties and permeability of silt at different depths

[0025] ​According to local stratum data, the silt layer is below the Cretaceous sandstone. The artificial water permeable body is punched into the Cretaceous sandstone aquifer below the silt layer, which can directly connect the surface and the underground aquifer. According to the local drilling pumping test data, the infiltration intensity of the layer is 1.9866 m / d.

[0026] In a specific embodiment, the reservoir area parameters include reservoir area water depth data, reservoir area surface water storage time, and reservoir area water surface area. The reservoir area water depth data is obtained by a radar water level gauge; the reservoir area surface water storage time is obtained according to the reservoir area water depth data; and the reservoir area water surface area is the average accumulated water area in the reservoir area surface water storage time.

[0027] In a specific embodiment, the meteorological parameters are precipitation and evaporation data in the area where the silt dam is located.

[0028] In a specific embodiment, the potential tapping amount is calculated in the following manner: First, the comprehensive permeation coefficient of the reservoir area is calculated according to the area of the artificial water permeable body, the permeation coefficient of the bedrock water permeable layer, the reservoir area water surface area, and the permeation coefficient of the silt layer. Then, the reservoir area surface water storage improvement time after the artificial water permeable body is added is calculated according to the reservoir area surface water storage time, and the ratio of the permeation coefficient of the silt layer to the comprehensive permeation coefficient. Finally, the ineffective evaporation amount is calculated as the potential tapping amount according to the difference between the reservoir area surface water storage time and the reservoir area surface water storage improvement time, the reservoir area water surface evaporation intensity, and the reservoir area water surface area.

[0029] In a specific embodiment, the calculation formula of the comprehensive permeation coefficient is: ; Wherein, K is the comprehensive permeation coefficient, K1 is the permeation coefficient of the bedrock water permeable layer, K2 is the permeation coefficient of the silt layer, S is the area of the artificial water permeable body, A is the reservoir area water surface area. The calculation formula of the reservoir area surface water storage improvement time is: ; Wherein, T is the reservoir area surface water storage improvement time, T0 is the reservoir area surface water storage time. The calculation formula of the potential tapping amount is: ; Wherein, Q is the potential tapping amount, E is the water surface evaporation intensity.

[0030] Specifically, the in-situ observation data of the field water accumulation area shows that from August 1, 2019 to August 1, 2020, the water accumulation days in the study area are 72d, the measured average water accumulation depth is 0.4111m, the measured average water accumulation area is 22287.5m 2 , and the total water accumulation is 9163.626m 3 . The meteorological data shows that the evaporation amount of the area is 1368.7mm. The potential water amount and the proportion under different scenario modes are shown in Table 2.

[0031] Table 2 Calculation of potential water amount of silt dam water accumulation area under different scenario modes

[0032] As shown in Table 2, when the Cretaceous sandstone aquifer accounts for 1% of the total water accumulation area, the potential water amount is 2016.09m 3 , accounting for 22% of the total water accumulation; when the Cretaceous sandstone aquifer accounts for 15% of the total water accumulation area, the potential water amount is 314.26m 3 , accounting for 57.99% of the total water accumulation. After improvement, the permeability coefficient of the silt layer is calculated by area weighted average, the larger the proportion of artificial permeable body, the closer the comprehensive permeability coefficient of the improved silt layer to the permeability of the bedrock, but the higher the engineering cost. Therefore, the appropriate construction proportion needs to be selected to maximize the improvement effect. Figure 2 As can be seen, when the proportion of permeable body is less than 10%, the proportion of potential water amount increases rapidly, the addition of 10% permeable body can dig 55% of potential water amount, and the addition of 20% can dig 59.8% of potential water amount, and thereafter the potential water amount basically remains stable. From the economic point of view, the proportion of permeable body should not exceed 10%. In this case, the potential water amount is 5020m 3 / a.

[0033] In a specific embodiment, as shown in Figure 3 , the artificial permeable body is arranged in the silt layer of the silt dam, and the artificial permeable body is composed of gravel, gravel and coarse sand, and the depth of the artificial permeable body penetrates the silt layer and reaches the underlying bedrock permeable layer, forming a permeation channel from the surface to the deep layer.

[0034] In a specific embodiment, it further includes: based on the SWAT model or the Infoworks ICM model, simulating the infiltration, evaporation and surface outflow of the silt dam area under different permeable body configurations in a period of time in the future, and optimizing the layout of the permeable body (such as increasing the proportion of the permeable body to 10% before the flood season and reducing it to 5% in the non-flood season).

[0035] Specifically, taking the drainage partition as the basic unit, the 5-minute rainfall data of the study area from 2005 to 2015 was taken as the analysis object, and the improved SWAT model was used to simulate the average infiltration of the silt dam area after the implementation of the infiltration scheme. The infiltration of each partition is greatly affected by the area, underlying surface conditions and other factors. The average annual infiltration of the study area is 3.39 million m 3 , while the comprehensive runoff coefficient of the basin before the construction of the sponge city is 0.6. According to the water balance calculation, the average annual rainfall is 5.12 million m 3 , the rainwater infiltration is 204.8 m 3 , and the invalid evaporation loss can be reduced by 4,307.56 m 3 after the implementation of the scheme.

[0036] By increasing the trench potential measures, i.e. increasing 10% artificial permeable body in the silt dam system, increasing the infiltration capacity of the silt dam system, reducing the invalid evaporation, and increasing the surface outflow.

[0037] The surface outflow that enters the silt dam system and is eventually converted is the water quantity that is fed back to the river channel as the base flow in the downstream, causing changes in the flow at the outlet section of the basin. The analysis shows that the flow at the outlet section of the basin after setting the artificial permeable body is increased compared to the flow before setting the artificial permeable body, and with the increase in the number of silt dams, the increase in the flow at the outlet section of the basin also increases. After setting 10% artificial permeable body, the average flow at the outlet section of the basin under the current silt dam and future silt dam scenarios is 0.416 and 0.362 m 3 / s, respectively, the maximum flow is 0.765 and 0.726 m 3 / s, respectively, and the minimum flow is 0.230 and 0.175 m 3 / s, respectively. Among them, the flow under the current silt dam condition is increased by 4.2% compared to the flow before setting the artificial permeable body, and the flow under the future silt dam scenario is increased by 12.7%.

[0038] The potential of the basin comes from the reduction of invalid evaporation. After setting 10% artificial permeable body in the current silt dam and future silt dam, respectively, the influence of trench potential measures on the potential of Xiliugou was simulated. The evaporation under different silt dam scenarios after increasing the trench potential measures is significantly less than the evaporation without setting 10% artificial permeable body. Under the current silt dam, the average annual evaporation after increasing the potential measures is 8.12 million m 3 , of which the minimum annual evaporation is 1.75 million m 3 , and the maximum annual evaporation is 27.57 million m 3 . The average annual evaporation without setting 10% artificial permeable body is 14.66 million m 3 , which is 6.53 million m 3 lower than the evaporation without setting the potential measures.The multi-year average evaporation of the silt dam system under the future silt dam condition is 1.702 million m 3 , with the minimum annual evaporation of 0.746 million m 3 and the maximum annual evaporation of 4.055 million m 3 . The multi-year average evaporation of the silt dam system without the 10% artificial water permeable body is 3.020 million m 3 . That is, the evaporation of the silt dam system under the future silt dam condition with the 10% artificial water permeable body is 1.318 million m 3 less than that without the channel tapping measure.

[0039] The multi-year average soil infiltration water increment of the silt dam system under the present silt dam condition with the 10% artificial water permeable body is 0.414 million m 3 , with the maximum annual soil infiltration water increment of 1.307 million m 3 and the minimum annual soil infiltration water increment of 0.087 million m 3 . The multi-year average soil infiltration water increment of the silt dam system without the 10% artificial water permeable body is 0.398 million m 3 . That is, the soil infiltration water increment of the silt dam system under the present silt dam condition with the 10% artificial water permeable body is 0.016 million m 3 more than that without the channel tapping measure.

[0040] The multi-year average soil infiltration water increment of the silt dam system under the future silt dam condition is 0.764 million m 3 , with the maximum annual soil infiltration water increment of 1.943 million m 3 and the minimum annual soil infiltration water increment of 0.311 million m 3 . The multi-year average soil infiltration water increment of the silt dam system without the 10% artificial water permeable body is 0.663 million m 3 . That is, the soil infiltration water increment of the silt dam system under the future silt dam condition with the 10% artificial water permeable body is 0.101 million m 3 more than that without the channel tapping measure.

[0041] In the simulation process, the reservoir in SWAT model is described as the outlet point of sub-basin in the confluence process, intercepting runoff and sediment from the upstream of river, and the runoff and sediment outflow are merged into the downstream river. The characteristics of small reservoirs are similar to those of check dams, which play a role in intercepting sediment runoff, preventing soil erosion, and maintaining water and soil. However, check dams can form a silted land by intercepting sediment, and crops can be planted after the dam is filled. Different sizes of check dams have a relatively short siltation period, with a siltation period of 20-30 years for the backbone dam, and a shorter siltation period for small and medium-sized check dams. The flood and sediment interception function of check dams after filling is significantly reduced or even lost, and the upstream water is discharged immediately. The existing reservoir water balance module in SWAT model cannot simulate the effectiveness of check dam water interception, affecting the accurate expression of intermittent water storage of check dams. Therefore, a check dam water balance module is established to study the runoff change and water storage change process of check dams in different operation stages, so as to further optimize the layout of permeable bodies. In the simulation process, 1d is selected as the calculation period, and the basic formula of check dam water balance can be expressed as: ; wherein, is the water storage volume at the end of the calculation period of the check dam, m 3 ; is the water storage volume at the beginning of the period, m 3 ; is the rainfall in the period, m 3 ; is the evaporation in the period, m 3 ; is the seepage water in the period, m 3 ; is the inflow of the check dam in the period, m 3 ; is the outflow of the check dam in the period, m 3 . The calculation formulas of evaporation and seepage in the period of the check dam are as follows: ; ; wherein, is the evaporation coefficient, is the potential evaporation in the period, mm; is the water storage surface area of the check dam, hm 2 ; is the sediment permeability coefficient of the check dam, mm / hr.

[0042] Further, the silt dam is usually provided with an overflow spillway and a horizontal pipe. The overflow spillway is usually arranged on the top of the dam body to discharge excess flood water during rainfall and ensure the safety of the dam body. The horizontal pipe is usually arranged at a lower position of the dam body to supply water for irrigation and domestic use in the farmland downstream of the silt dam. In the initial operation stage of the silt dam, the height of the horizontal pipe is higher than the lowest water level in the silt dam, and the silt dam has a certain dead storage capacity. With the silt accumulation in the silt dam, when the height of the silt accumulation is higher than the lowest water discharge hole of the horizontal pipe, there is no dead storage capacity. With the continuous silt accumulation, the height of the silt accumulation is gradually higher than the overflow spillway until the silt accumulation is completely full. Therefore, the runoff flowing out of the silt dam is different in different operation stages of the silt dam, and can be calculated according to the following different cases: ① When the silt accumulation volume in the dam is less than the silt dam volume corresponding to the lowest water discharge hole elevation of the horizontal pipe : If the water level in the silt dam is lower than the lowest water discharge hole elevation of the horizontal pipe ,the silt dam intercepts all the runoff flowing into the silt dam, and at this time, the runoff flowing out of the silt dam is 0, that is, ; If the water level in the silt dam is higher than the lowest water discharge hole elevation of the horizontal pipe but lower than the weir top elevation of the overflow spillway , the outflow of the silt dam is: ; If the water level in the silt dam is higher than the weir top elevation of the overflow spillway , the outflow of the silt dam is calculated according to the following different cases: .

[0043] ② When the silt accumulation volume in the dam is greater than the silt dam volume corresponding to the lowest water discharge hole elevation of the horizontal pipe and less than the silt dam storage volume corresponding to the weir top elevation of the overflow spillway : If the water level in the silt dam is lower than the weir top elevation of the overflow spillway , the outflow of the silt dam is: ; If the water level in the silt dam is higher than the weir top elevation of the overflow spillway , the water above flows directly into the downstream through the overflow spillway, and the water below flows into the downstream through the horizontal pipe, and the total outflow of the silt dam is calculated according to the following two cases: When , the total outflow of the silt dam is: When , the total outflow of the silt dam is:​​​​ ; When : ; ③ When the sediment accumulation volume in the dam is greater than the sedimentation dam water storage volume corresponding to the spillway weir elevation , and the sedimentation dam is not yet full, the total outflow of the sedimentation dam can be calculated as follows: ; ④ When the sedimentation dam is completely full, the upstream water is discharged immediately, and at this time the sedimentation dam outflow is calculated by the following formula: ; Among the four different situations, is the water storage volume corresponding to the initial water level in the sedimentation dam (m 3 ), is the sedimentation dam water storage volume corresponding to the spillway weir elevation (m 3 ), is the sedimentation dam water storage volume corresponding to the lowest water release hole elevation of the horizontal pipe (m 3 ), is the design water release flow of the horizontal pipe (m 3 / s), is the design water release flow of the spillway (m 3 / s). 、 、 、 can be obtained by consulting the design data of the sedimentation dam water release structure of the local water conservancy department. The sediment accumulation volume is calculated by the following formula: ; In the formula, is the sediment accumulation volume at the end of the period, m 3 ; is the sediment accumulation in the dam at the end of the period, in units of t; is the dry bulk density of silt, taken as 1.35 t / m 3 .

[0044] According to the out-of-bank sediment balance formula: ; In the formula, is the sediment accumulation at the beginning of the period, in units of t; is the amount of sediment entering the reservoir during the period, in units of t; is the amount of sediment out of the reservoir during the period, in units of t.

[0045] The implementation process also includes: setting an underground water collection gallery downstream of the artificial permeable body to collect infiltrated water and introduce it into the dam pool through a siphon pipe.

[0046] The various embodiments described in this specification are presented by way of example, and each embodiment is not necessarily composed of all features described with respect to other embodiments. Each embodiment described in this specification can be combined with one or more other embodiments to produce new embodiments that are not explicitly described in this specification. The scope of the invention is not limited to the embodiments described in this specification, but only by the claims.

[0047] The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for tapping the water resource potential of silt-retaining dams based on rainfall-storage dynamic response, characterized in that, include: Obtain geological parameters, reservoir area parameters, and meteorological parameters of the silt-retention dam; Different areas of artificial permeable bodies are set, and the potential for tapping is calculated based on the geological parameters, reservoir parameters, and meteorological parameters to obtain the simulation results of the potential for tapping of silt-retaining dams. Based on the simulation results of the exploitable potential, the optimal proportion of the improved aquifer based on the artificial permeable body is analyzed, and the artificial permeable body is set in the silt-retaining dam based on the optimal proportion.

2. The method for tapping the water resources potential of silt-retaining dams based on rainfall-storage dynamic response as described in claim 1, characterized in that, The geological parameters include: the permeability coefficient of the silt deposit layer of the silt dam and the permeability coefficient of the bedrock permeable layer; Soil samples were collected from different depths of the siltation layer of the siltation dam, and soil infiltration tests were conducted to determine the permeability coefficient of the siltation layer. Based on the local stratigraphic data of the siltation dam, the permeability coefficient of the bedrock permeable layer below the siltation layer was determined.

3. The method for tapping the water resources potential of silt-retaining dams based on rainfall-storage dynamic response as described in claim 1, characterized in that, The reservoir parameters include: reservoir water depth data, reservoir surface water storage time, and reservoir water surface area; The reservoir water depth data is obtained through radar water level gauges; the reservoir surface water storage time is calculated based on the reservoir water depth data; and the reservoir water surface area is the average water accumulation area during the reservoir surface water storage time.

4. The method for tapping the water resource potential of silt-retaining dams based on rainfall-storage dynamic response as described in claim 1, characterized in that, The meteorological parameters mentioned are precipitation and evaporation data for the area where the silt-retaining dam is located.

5. A method for tapping the water resource potential of silt-retaining dams based on rainfall-storage dynamic response, as described in claim 1, is characterized in that... The potential for tapping is calculated in the following way: First, the overall permeability coefficient of the reservoir area is calculated based on the area of ​​the artificial permeable body, the permeability coefficient of the bedrock permeable layer, the water surface area of ​​the reservoir area, and the permeability coefficient of the silt layer. Then, based on the surface water storage time in the reservoir area and the ratio of the permeability coefficient of the siltation layer to the comprehensive permeability coefficient, the improved surface water storage time in the reservoir area after the addition of artificial permeable bodies is calculated. Finally, based on the difference between the surface water storage time and the surface water storage improvement time in the reservoir area, as well as the evaporation intensity and surface area of ​​the reservoir area, the ineffective evaporation is calculated as the potential tapping amount.

6. A method for tapping the water resource potential of silt-retaining dams based on rainfall-storage dynamic response, as described in claim 5, is characterized in that... The formula for calculating the overall permeability coefficient is as follows: ； in, To achieve the comprehensive permeability coefficient, The permeability coefficient of the bedrock permeable layer. The permeability coefficient of the sedimentary layer, For the area of ​​the artificial permeable body, The water surface area of ​​the reservoir area; The formula for calculating the storage and improvement time of surface water in the reservoir area is as follows: ； in, For the time required to improve and store surface water in the reservoir area The storage time of surface water in the reservoir area; The formula for calculating the potential is: ； in, To tap potential, The intensity of water surface evaporation.

7. The method for tapping the water resources potential of silt-retaining dams based on rainfall-storage dynamic response as described in claim 1, characterized in that, The specific implementation of the artificial permeable body includes: laying an artificial permeable body composed of crushed stone, gravel and coarse sand in the siltation layer of the siltation dam. The artificial permeable body penetrates the siltation layer and reaches the underlying bedrock permeable layer, forming a permeable channel that runs from the surface to the deep layer.

8. A method for tapping the water resource potential of silt-retaining dams based on rainfall-storage dynamic response, as described in claim 1, is characterized in that... Also includes: Based on the SWAT model or Infoworks ICM model, the infiltration, evaporation and surface outflow of silt-retaining dam areas under different permeable body configurations are simulated over a period of time in the future, so as to optimize the layout of permeable bodies.

9. A method for tapping the water resource potential of silt-retaining dams based on rainfall-storage dynamic response, as described in claim 1, is characterized in that... Also includes: An underground water collection corridor is constructed downstream of the artificial permeable body to collect infiltrated water and introduce it into a reservoir downstream of the dam via a siphon pipe.

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