Study On The Evolution Of Shanan Groundwater Source Water Level And Quality

Dry weather, few rainfall, and high evaporation rate cause the extremely bad environment in desertarea where water is lacked significantly. The only source of water the underground water. To study howmining underground water affect the underground water table and the water quality in the water source areain desert, the Shanan water head area was the research object in this paper. Data was collected by usingapproaches such as from field investigation, literature review, and former data. To describe and analyze thespatial composition of the underground water system in research area, combine the data with the spaceanalysis of Geographic Information System (GIS). Use the application named "Modflow" to simulate theevolution of the underground water system in different conditions in the research area, and to analyze thewater system situation and calculate the water balance in this area. The results are as below:(1) In the stu source area, the total water supply was2542.11×104m3/a, and the total excretionwas2758.02×104dym3water/a. It showed a negative equilibrium which the difference was-215.90×104m3/a. Theallowed exploitation quantity was635.53×104m3/a.(2) By analyzing the quality of the sample water, most of the wells supplied high quality water whichwas in level Ⅰ, and could be used as domestic drinking water. Few of wells, however, had worse qualitywater which were about in level Ⅲ. There was no significant decline of the water quality in the watersource area.(3) In three different conditions of different exploiting amount in the model, there was aproportionality relationship between the drop of the water table and the mining amount of the undergroundwater. The mineralization was increased in these three different exploiting conditions which means thelarger the mining amount is, the higher the mineralization will be.