Study On Numerical Simulation Of Groundwater In Zhengzhou Urban Area Based On GMS

Water resources are one of the most basic strategic resources in China.With the expansion of urban scale,the problem of over exploitation of groundwater resources has been serious.Zhengzhou is a city that it is combined groundwater and surface water.Groundwater plays an irreplaceable role in the economic development and life of Zhengzhou.The changing trend and rule of groundwater level are the most direct understanding of groundwater decision-making,and they are also the important basis for the development and utilization of groundwater in Zhengzhou.Therefore,the trend of groundwater level and the location of the funnel are been analyzed.It provides theoretical support and guidance for the control of groundwater exploitation in Zhengzhou.This paper takes Zhengzhou urban area as the study area,and takes the MODIS data between 2000 and 2016 and the daily meteorological data of the 6 meteorological stations in the study area as the data source.The trend of precipitation and evaporation are analyzed.On the basis of collecting and processing the data of hydrogeological conditions,terrain,hydrology and meteorology in the study area,the three-dimensional geological model and the mathematical model of groundwater are established by using the related modules of GMS.The results of simulation are analyzed.According to the actual situation of Zhengzhou,the different two plans were drawn up to predicting the spatial distribution of groundwater level in the next 5years.The main work of this article is as follows:First,the three-dimensional geological model was built by using TIN and SOLIDS modules in GMS,and the spatial distribution characteristics of the roof and floor of shallow aquifer and middle deep groundwater aquifer were obtained.On the basis of the three-dimensional geological model,the MODFLOW module in GMS was used to deal with the source and sink,precipitation,evaporation and other data,as well as hydrogeological parameters.The model is identified and verified by the model.In the recognition period and the verification period,the shallow and middle depth groundwater well logging,tt was the data fitting of the water level of R~2 more greater than than 0.6.the data fitting effect was better.And the Ens was greater than0.5.The model has a certain representativeness.Secondly,it is based on the establishment of groundwater model,the groundwater level was been simulated in 2015 and 2016.The results showed that the groundwater level line in 2015 generally presented the trend of increasing northeast to the southwest water level,and it was the linear in the whole,which was consistentwith the trend of spatial variation of aquifer in southwest Zhengzhou and southwest China.In the middle of the study area,there were the different degrees of funnel,and the area of the funnel was not obvious,but the groundwater level in the vicinity of the Yellow River was higher than that of the middle water level.The groundwater level in2016 was similar to that in 2015,but the linear trend of groundwater level was more obvious,and the area of the funnel was gradually decreasing.Finally,according to the different two plans,the numerical simulation method was been used to predict the groundwater level and funnel position in the next 5years.The results showed that the groundwater level of Zhengzhou city still had the regular characteristics of interannual periodic change and the trend of the southwest high and the northeast low,and the change range of the water level was differentunder the different two schemes.After the implementation of water-saving measures,the water level will be increasing slightly,and the problem of regional water shortage could be alleviated.