Study On Dynamic Characteristics Of Groundwater In Deyang City

Based on the studying on natural geographical, geological background conditions and hydrogeological conditions, and the eight years (2001～2008) data of groundwater dynamic monitoring This paper use the software as Surfer, MapGIS and Excel, mapping the groundwater dynamic spatial and temporal changes in Figure. Reveals the groundwater dynamic changes in the law to determine the groundwater regime the main factors, and divide the type of groundwater dynamic. And the use the Visual MODFLOW simulation to predict the trend of the groundwater level of the study area. Draw the following main conclusions:A general increase in the groundwater level from2001to2008, in Deyang City. And the rise gradually increases with the lower terrain of the study area, from northwest to the southeast. Rise in the city center and the second heavy machinery near the largest. By2008, the two re-plant-workers in rural areas along the cone of depression disappeared; Rainfall, hydrology and human activities are the groundwater level dynamic affect factors in Deyang City, human activities affect the dynamics of the groundwater level by the exploitation of groundwater, the construction stopped sluice and irrigation. Based on groundwater main affect factors, and complement, the diameter of the discharge conditions in the study area, groundwater regime is divided into mining-type, hydrology-mining type and the infiltration of agricultural irrigation-mining type.The seasonal variation of the study area’s groundwater quality is obvious. In wet season, the major ions concentration is less than dry period, and the quality is better. From2001to2008, the ions" concentration in the overall is get lower, and the quality is generally got better.The study area groundwater temperature seasonal change is significant, inter annual variation is lesser extent. The main influence factors are air temperature and groundwater depth, a positive correlation with air temperature and negative with groundwater depth.Deyang city, the groundwater extraction in2008was0.6635×108m3/a. forecast is0.4298×108m3/a reach to2018, the annual decrease is0.0225×108m3in ten years, and the rate of descent is about10%.According to this, the simulation and prediction of Deyang city10year groundwater level will rise.