Papers by Author: Quan Sheng Zhao

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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: Quan Sheng Zhao, Juan Feng, Xin Guo, Ying Xu, Jian Wei Zhang
Abstract: In order to understand after construction cut-off wall of Dagu River downstream the influence of underground water level, and the water quality, on the basis of field investigation, observation and data collection, we use theory, mathematical statistics method, have a depth analysis on the shallow groundwater levels, water quality, temporal and spatial variation. The Dagu River downstream alluvial plain are water level low and buried shallow,present obvious seasonal rise or fall characteristics,2001 ~ 2011 years of research area of underground water level change relatively stable. It make the uplift in the upper reaches of the underground water level after Cut-off wall construction, make the change of groundwater natural runoff direction, remove the upper groundwater funnel. Until 2011, the Cl- content in groundwater of cutoff wall in the north side decreased significantly and the water quality became good, which explains that on the one hand the cutoff wall block the channel seawater intrusion, on the other hand the formed terrain conditions remains aquifers underground saltwater body washed cutoff wall in upstream.
789
Authors: Quan Sheng Zhao, Juan Feng, Hui Zou
Abstract: In this paper, the scope of study area and boundary conditions are determined by anglicizing the natural geographical and geological hydrogeological conditions of the study area. Building the groundwater system conceptual model and numerical model with the Visual MODFLOW software, and then, identifying and validating the numerical model with the dynamic observation dates from 2001 to 2010. At last, simulating and analyzing the conveying capacity of SGD to Jiaozhou Bay with the model after identifying and validating. The results show that:1)Atmospheric precipitation influences on SGD greatly, the conveying capacity is 28.38×106m3/a in rainy year(2007), but only 0.24×106m3/a in dry year;2)The river leakage recharge influence the SGD;3)The Aquifer Medium、types of aquifer and lithology all influence the SGD;4)The changes of sea level and briny physical properties influence the SGD.
783
Authors: Juan Feng, Quan Sheng Zhao, Shuang Quan
Abstract: Based on the systematic analysis of geological and hydrogeological conditions of Baisha River, the scope of study area and boundary conditions are determined. This paper builds the water quantity model of researched region with the software of MODFLOW. The observational data according to temporal sequence are identified and validated by the water quantity model. Then, we choose the optimal hydrogeology parameters to simulate future groundwater levels. The simulated results show that ground water levels have rebounded to some extent. According to the amount of groundwater exploitation in the past 10 years, the available groundwater is between 1.4~1.6×106m3/a from 2012 to 2015. But the actual amount is only 1.2×106m3/a. Therefore, the region can increase the amount of groundwater exploitation to make more fully use of water resources .But mining can not do without moderation. We should guarantee the safety of groundwater, and then water resources can be fully sustainable utilization. Finally, the essay requests for rational use and protection of the groundwater.
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