Variation Characteristics Of Karst Groundwater Regines In Jinci Spring Area Under Coupled Natural Effects And Human Activities

Jinci spring is one of the most famous karst spring in Northern China,the humanities and the environment of water resources has a special significance.Since 1970 s,many factors lead to karst water level drop,stop flow of Jinci spring.Karst water Jinci spring area as the main local agriculture and drinking water,the water level changes related to the local beneficial to the people's livelihood.Therefore,starting from the factors of hydrogeological conditions of Jinci spring area and its influence,the dynamic changes of the karst groundwater level,will help to provide the basis for decision-making and rational development and utilization of karst water protection.The previous lumped parameter model of multi spring flow of Jinci karst water level,and ignore the geology,hydrology and groundwater circulation characteristics of complex spring domain.This paper collected the borehole data of spring area of the relevant departments to establish the three-dimensional model of the geological structure of the study area,intuitively show the occurrence condition of karst groundwater in the study area;on the basis of establishing a numerical model of karst groundwater in Jinci spring area,and the sensitivity of parameters is analyzed by the orthogonal test,to establish a prediction model of simulation a higher degree;finally,the actual situation combined with the local reality,proposed a prediction scheme,discusses the problems of the complex flow of Jinci spring.The main results are as follows:(1)The three-dimensional model of the geological structure of Jinci spring area is established.An in-depth look at research area and stratum changes on occurrence and migration in the aquifer of the karst groundwater is conducive to the establishment of the geological structure model,established for groundwater model provides the stratum elevation data.(2)The mechanism model of karst groundwater movement in spring area is established.In order to analyze the three-dimensional geological structure model and water balance based on groundwater numerical simulation model of Jinci spring area of karst water,and the model of the fitting verification,results show that the water level of groundwater in the high degree of simulation.(3)The parameter sensitivity of the model is analyzed by orthogonal test.The permeability coefficient Kx,Ky and water storage rate Ss are chosen as sensitivity analysis factors.The sensitivity of each parameter to the model is calculated and analyzed by the orthogonal test method,and the permeability coefficient is the most influential factor.(4)The dynamic groundwater level of Jinci spring mainly with the precipitation infiltration recharge,river seepage recharge,karst groundwater mining,coal mine drainage and karst groundwater to the lateral excretion of pore water and the Pingquan basin.Considering the above factors make the prediction of spring water level domain scheme,results show that the addition of Jinci spring reflow pressure recovery scheme,the pressure recovery effect is good.