Groundwater Resource Evaluation Of Liuzhuang-Yuanwu Riverside Well Field

Liuzhuang-Yuanwu riverside well field belongs to the river type reservoirs,which is located in Yuanyang country,Xinxiang city,Henan province.Setting up water source alongside the Yellow River is of great significance to relieve the intensive situation of Xinxiang water supply and ensure the safety of urban water supply.Before the modeling,we carry out a series of works,such as data collection,hydrogeologic mapping,geophysical prospecting,drilling and pumping test.On the basis of hydrogeological conditions in the study area,we have divided it into three aquifer groups,including unconfined aquifer groups,shallow confined aquifer groups and deep confined aquifer groups,and established the conceptual model.By using GMS,the groundwater numerical simulation software,we set up the numerical simulation,dating from Jan 1st,1999 to Dec 31st,2012,calibrate the model employing the trial-and-error method,and verify it utilizing the sources and sinks,which is from Jan 1st,2010 to Dec 31st,2012.According to the model,under the present situation in the research area,it is concluded that the average recharge for many years in each aquifer groups is roughly equall to the discharge,which is basically in balance.By establishing the prediction model,which is from Jan 1st,2013 to Dec 31st,2032,on the base of the calibrated and verified model,It is forecasted that the production composition of single well arrangement scheme is similar with the exploration with mining scheme,on the one hand,in shallow confined aquifer groups,It is mainly composed of the Yellow River side of permeability and lateral flow,leaking recharge,for rate of 43%,30%and 24%,respectively;and on the other hand,in deep confined aquifer groups,it is mainly composed of leaking recharge and lateral flow,for rate of 62%and 30%.Compared with the exploration with mining scheme,the result of the single well arrangement scheme is better,including the depression cone area that the drawdown of the centre of extracting well and the each aquifer groups is less than lm,and the drawdown of Yellow River levee.Therefore,the single well arrangement for the optimal scheme is determined.For single well arrangement scheme,the average recharge for many years in unconfined aquifer groups,shallow confined aquifer groups and deep confined aquifer groups is 26441.02×104m3/a m3/a,1864.25×104m3/a and 2206.41×104m3/a,respectively.Seeing the design production 48000m3/a(including shallow confined aquifer groups is 10000m/a,deep confined aquifer groups is 30000m3/a)as the safe yield of groundwater,in which condition,groundwater recharge resources are guaranteed.