Groundwater Numerical Simulation And Regulation Control In Baotou City

Taking Baotou City’s hydrogeological report and exploration current situation as the study basis, many works such as field investigation and pumping test have been carried out, at the same time, we apply the knowledge of hydrogeology, groundwater dynamics, geographic information systems and other related professional theory to establish the groundwater conceptual model and numerical simulation model by the software of ArcGIS9.3and Viusal-MODFLOW4.1in Baotou City. With the qualitative and quantitative analyzing of the groundwater simulation results under the natural conditions change and human activities influence, we can formulate the groundwater control plan and set up some suitable groundwater exploitation management district, so as to promote the scientific management and sustainable development of groundwater resources in Baotou City.Groundwater level is the vital research of groundwater flow evolution in Baotou City. According to the investigation reports and pumping test result, the hydrogeological situation can be conceptualized as a unified heterogeneous isotropic three dimensional unsteady groundwater flow system. After transferring conceptual model to numerical simulation model, the simulation results shows that the average error, which of the calculate groundwater level matching is less1meter than observation value, accounted for100%of the known observation wells in the recognition period, and the average error accounted for81.40%in the validation period. The simulation results are so good that the model can be used to reflect the groundwater flow evolution and predict the range of groundwater level in the future.However, from the regional water balance calculation results, we can find that both the unconfined aquifer and confined aquifer of the Baotou City planning area are in a negative balance state in2009. Analyzing the structure of the regional water balance, we can know that the Daqing-Wula piedmont lateral recharge and rainfall recharge are the main part of total groundwater recharge, and human exploitation affect groundwater discharge so much that the natural discharge way of confined aquifer groundwater flow has disappeared. The piedmont lateral recharge and rainfall recharge is mainly sufferer the influence of rainfall range, and human being unreasonable activities seriously limit the groundwater discharge. Therefore, taking rainfall as the evaluation index of climate change, and considering the irrigation water consumption, urban live water consumption and industrial water consumption as the evaluation index of human being activities, the evolution of Baotou City’s groundwater flow can be obtained.The research results of rainfall range influence on groundwater level reveal that the plenty rainfall can slowdown the descending speed of groundwater level, and the central and southern area of Hademen ditch, the central of Kundulun River ditch, Yellow River alluvial plain would appeared large scale of drawdown. Comparing all factors of human being activities on groundwater flow, we can realize that total irrigation water consumption is the greatest impact factor on unconfined aquifer groundwater level, the second is urban water consumption and the last is industrial water consumption. On the other hand, urban water consumption is the greatest impact factor on confined aquifer groundwater level, the second is total irrigation water consumption and the third is industrial water consumption. Considering the multi-influence of climate change and human activities interference, under different conditions of couple scene, the simulation results show that rainfall recharge can always affect the change of groundwater level significantly, but in the dry year, the interference from human mining activities to the groundwater level became apparent.