Effect Of Exploitation And Artificial Injection On Groundwater Regime

Xi’an is one of the western development strategy focusing on city, the starting point of the silk road economic belt on construction of city, with the development of \ "big xi ’an urban construction, development and utilization of water resources and groundwater artificial replenishment etc, make the groundwater, diameter, row relationship changed, profound changes have taken place in urban water circulation system, at the same time also brought a series of water resources and water environment and geological environment problems. In this paper, through collecting xi ’an natural geography, hydrology and meteorology, hydrogeological conditions, groundwater exploitation and utilization of information and monitoring data of groundwater data, to ba river water as the research object, analyzes the mining conditions in 1956-2010, regional groundwater flow field change rule, landing funnel, on behalf of the well; Water source of groundwater numerical simulation model was established by applying the modflow, depict the water hydrogeological model, the forecast of the underground water level under different mining conditions. Analysis of the current situation of xi \" an artificial recharge in xi ’an artificial recharge engineering institute of technology demonstration centers as the research object, using the analytic method to recharge quantity carries on the quantitative analysis and the relationship between the underground water level, and analyze the possible problems in the process of injection solution. The main research results are as follows:1. Ba river water production performance is divided into four stages, 1958-1966 years for the early production stage, the annual production is small; 1967-1977 for expanding mining stage, and in 1976 at the upper end of historical production is 75.95 million m3; To stabilize the production phase of 1978-1978; For production decline stage since 1990, the average production of 14.53 million m3.2. The use of isoline map analysis software Arcgis10 mapped the ba river water source of the underground water level contour map in 1957-2010, overall performance of underground water level in the underground water level declines, forms a closed drawdown funnel in 1987. On the horizontal direction, landing funnel in 1957-1987 mainly to the north and northeast direction, 1988-2010, mainly to the north and northwest direction, funnel center canal village migration from east to read village; Funnel area expanded to cut first, 370 m contour funnel area of history in 1995 at a maximum of 17.7 km2, 2010 down to 20100 m3. Landing funnel center on the vertical direction of the water level in 1995 fell to a record low of 345.69 m, the water level decline rate is 1.96 m/a, center water level rose to 364.32 m in 2010, the increased rate of water level of 0.96 m/a.3. On the ba river water source 4 representative long-term eye observation well selected mining early in 1965, mining dynamic analysis biggest year 1995 years history. 1965 years on behalf of well change is mainly influenced by natural conditions, strength is weak, the influences of artificial mining overall slow down in the underground water level, but six to nine months affected by rainfall and runoff water have rebounded sharply; In 1995 on behalf of the change was mainly affected by mining well years, dynamic characteristics of counter-season years, and at the end of the underground water level is always lower than earlier. Water 5 representative eye observation Wells for 1965-2010 annual water level variation analysis, general slow decline- falling volatility- fell sharply- slow wave rising trend.4. Ba river water source was established by applying the modflow, the hydrogeological conceptual model and groundwater flow numerical simulation model, simulation area water balance is balanced, for the overall fitting of phase equilibrium for 7.2227 million m3, consistent with the average groundwater level rising slowly in the study area. The evolution trend of groundwater flow field under different mining conditions to predict, by setting different scheme, flow field of underground water level in 2010-2020 to predict the future, landing funnel, such as water level recovery index change trend, to provide scientific basis for the evaluation and management of groundwater.5. In xi ’an artificial recharge engineering institute of technology demonstration centers as the research object, based on injection test data, the mathematical model analytic method analyzes the recharge amount respectively 10 m3 / h, 15 m3 / h, 20 m3 / h, 25 m3 / h, 30 m3 / h, under the condition of injection Wells and the change of the water level of the observation well is similar duration curve, early rising rapidly, the late speed slow and stable; Injection quantity is small, less influence level of observation, and observation Wells up there is a certain lag time. According to the linear regression model, the injection process can be considered as the inverse process of pumping, in accordance with the application conditions of the theis formula, and analyze the possible problems in the process of injection solution.