Papers by Keyword: Groundwater Model

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Authors: Juan Feng, Guan Qun Liu, Quan Sheng Zhao
Abstract: In view of this major environmental geology problem in Dezhou City that continuous overexploiting of deep groundwater has caused he rapidly-expansion of groundwater drop funnel in recent years, the dynamic change of deep groundwater in Dezhou City was systematically analyzed as well as the evolution and development of hydrodynamic field and deep drawdown cone in temporal and spatial variation was simulated by the application of the numerical Model. On the basis of hydrogeological conditions generalized in this region, Visual MODFLOW software was applied to build mathematical model of groundwater and stimulate the seepage field of groundwater. It predicted the expansion of groundwater drop funnel and the change of underground water level under the conditions of exploitation situation and different designed exploiting volume by the model built. The depth reduction and variation of groundwater under different design schemes for pumping rate were argued by contrast analysis of the calculated results. The forecasting result under the current situation of groundwater exploitation indicates that the drawdown of water level would increase more with the continuous exploitation when the exploiting volume of current situation is 2047×104m3/a. When (time)is equal to 5a(2013), (the decline depth of groundwater) is at 4.81~22.65m and the annual deceleration is at 0.96~4.53m/a. When is equal to 10a(2018), is at 14.32~32.87m as well as the annual deceleration is at 1.43~3.29m/a, and then the average elevation of central water level of funnel is -118.06m. The forecasting results under different design schemes for exploiting volume showed that the groundwater level would continuously decrease if the present exploiting quantity is still kept at 2047×104m3/a, which the depth of central groundwater level of funnel is 144.95m in 2012. While exploiting quantity cuts down to 1950×104m3/a, the groundwater level still constantly decreases, which the depth of central groundwater level of funnel is 133.90m in 2012. Only when exploiting quantity further cut down to 1750×104m3/a, the groundwater level would never descend after 2011, and then it would begin ascending, which the depth of central groundwater level of funnel would be 120.25m in 2012. According to the model stimulation of groundwater flow and the results of water balance analysis, the exploitation project was proposed that the drawdown cone would not further expand. The key measure to protect deep groundwater resources in this region is scientific planning of underground water, and ensuring that The allowable exploiting volume in this region should be kept at 1750×104m3/a in order that it can reach a benign circle with the balance of exploitation and supplementation.
1025
Authors: Ying Ying Lan
Abstract: The problem of iron and manganese in Poyang Lake groundwater is serious. The proposed Poyang Lake water conservancy hub project may influence to iron and manganese of groundwater. These means historical data, field survey, statistical analysis, numerical simulation and so on were adapt, and Gan River Delta was selected as typical research area to aim at Poyang Lake water conservancy hub project influence to iron and manganese of groundwater. A numerical model of flow and transport on the basis of regional hydrogeological condition and 83 borehole data was developed to evaluate the influence. The boundary conditions were determine on the basis of regional geological and hydrogeological data, dynamic relationship between groundwater and river, regional digital elevation model, the history of formation and evolution of Poyang Lake. Then the model was used to simulate the project impact to iron and manganese of groundwater in spatial and temporal trends under conditions of long-running according to the recommend dispatch program of Poyang Lake water conservancy hub project. The result was that the concentration of iron and manganese in groundwater heightened a little and the potential environmental problems were unlikely.
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