| The Daba water source is located in Daba Town,Fuxin Mongolian Autonomous County(Fumeng County for short),Fuxin City,Liaoning Province.It is an important water supply source in Xinqiu District,Fuxin City.With the introduction of the re-adjustment of the province's groundwater pressure extraction plan by the Water Resources Department of Liaoning Province,the water source has been turned into an emergency backup water source,which needs to be used as a temporary water source in an emergency.So it is necessary to investigate the basic situation of the water source area and conduct in-depth research on the water supply capacity of the Daba water source area.In order to better determine the water supply situation of the water source,it is very necessary and urgent to carry out the research on the mutual transformation of surface water and groundwater in the Daba water source area.This is conducive to using the transformation relationship and transformation law between surface water and groundwater,reducing the adverse impact of water source exploitation on the production and living of nearby residents and agricultural irrigation,and also has a positive role in guiding water rights transactions.In this paper,meteorological data(precipitation,etc.)from 1979 to 2020 in the Daba water source area,water level data from 1979 to 2020 in Changguan Well,7geological hole data,and 2 groups of water pumping test data are collected.Two phases of groundwater level surveys are carried out on both sides of the river in the source area of Daba,and 71 groundwater level survey points are completed,and 1 pumping test,3riverbed infiltration tests,and 9 sets of geophysical exploration are completed.According to the location of the water source well in the area,3 sections are designed to establish joint monitoring sections for surface water and groundwater,and 5 river flow monitoring points are set up to monitor once a month.Using the data of groundwater dynamic monitoring,pumping test and other data,the hydrogeological parameters of each subarea are determined by Averyanov formula,dynamic data deduction method,and whole-process curve fitting method and then use the groundwater steady flow method,unsteady flow method,surface water balance method,groundwater balance method to calculate the transformation amount of surface water and groundwater.Finally,a numerical model of groundwater is established to calculate the average transformation amount for many years and simulate the change of groundwater level under different working conditions.The results of the study are as follows:(1)According to the dynamic observation data of long-term observation wells and the dynamic data of field survey wells,the hydrogeological parameters in the area are analyzed and determined.The evaporation coefficient of zone I is 0.05,the coefficient of recharge from precipitation is 0.24,and the specific yield is 0.15.The evaporation coefficient of zone?is 0.10,the coefficient of recharge from precipitation is 0.27,and the specific yield is 0.23.According to the data of the pumping test results,using the steady well flow method,the unsteady well flow method and the whole curve fitting method,the permeability coefficients of the two zones are calculated to be 24.46m/d and 80.00m/d,and the radiuses of influence are 37.00m and 65.82m.,the water supply is 0.15 and 0.23.(2)The water flow of Badao River is greatly affected by the season,mainly controlled by precipitation.The groundwater level rises significantly from July to October,and then remains basically stable.After the water supply wells are stopped,the water level rises rapidly and recovers within a short period of time.In terms of the transformation relationship of monitoring sections,the left bank of the river basically recharges surface water from groundwater,and the surface water recharges groundwater within the influence area of water supply wells;on the right bank of the river,surface water recharges groundwater most of the time.According to the analysis of the transformation relationship between high and low water seasons,the surface water in the river sections near the water source wells recharges the groundwater,and the groundwater in other river sections that are not affected by the water source wells recharges the surface water.According to the results of the steady flow method,the groundwater on the left bank of the river in the study area recharges 84.13×10~4m~3 of surface water,and the surface water recharges 21.99×10~4 m~3 of groundwater;the groundwater on the right bank of the river supplies 48.16×10~4m~3 of surface water,and the surface water supplies 34.30×10~4m~3 of groundwater.(3)The steady flow method,the unsteady flow method,the surface water balance method and the groundwater balance method calculate the transformation amount of surface water and groundwater,and the calculation results are different.The reason lies in the strip analysis of various methods,and the degree of clarification of the conversion amount is different.Combined with the difference in accuracy,the result of the steady flow method is finally taken as the final conversion amount:from July 2020 to June2021,the conversion of groundwater to surface water in study area is 132.89×10~4m~3,and the conversion of surface water to groundwater is 56.29×10~4m~3.(4)The average groundwater exploitation volume in the Daba water source area of Fuxin City for many years is 187.50×10~4 m~3,and its recharge is mainly groundwater,of which groundwater recharge is 144.85×10~4 m~3,accounting for77.3%;surface water supply is 42.65×10~4m~3,accounting for 22.7%.According to the four simulation results of the groundwater numerical model,it can be seen that the exploitation of water source wells has little impact on the study area.From the long-term retrospective and forecast results of the Daba water source from 2000 to 2035,the transformation relationship is relatively stable,and the annual transformation amount does not change much,which can be used as an emergency water source to meet emergency needs in the future. |
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