| In recent years,with the rapid development of China's overall economy,groundwater resources in various areas of over-exploitation,unreasonable use,water environmental pollution and other issues,making urban groundwater resources increasingly scarce.Up to 2011,there are more than one hundred funnels in our country,and the total area of the funnels is up to 100.The total area of the funnels is 1.5*10~5m2.In the north of China,because of the scarcity of precipitation,dense population,large water consumption and other reasons,the shortage of groundwater resources is particularly serious.The shortage of urban groundwater resources will cause great inconvenience to the production and life,and will seriously restrict the economic development.In order to protect the urban groundwater resources and prevent the further deterioration of urban groundwater resources,it is imperative to study the corresponding urban groundwater resources.This paper takes shenyang as an example to study the variation of the urban groundwater level of dahuofang reservoir within the urban area of shenyang by means of numerical simulation.This topic in shenyang downtown in the existing hydrogeological information,meteorological data and stratum rock characteristics and the regional groundwater movement data,and combined with the existing numerical simulation model in shenyang and past experience of the project,the comprehensive analysis of setting out the corresponding initial parameters of the numerical simulation model,after commissioning and adjusting parameters,improving on the hydrogeological conceptual model of the study area,and through the analysis of related data and numerical simulation model of the study area.After establishing and perfecting the numerical simulation model of the research area,the results are obtained by using the program of modflow module in GMS software.This topic set by January 1,2016,shenyang urban system of measuring water level as the initial flow field,set the recognition phase,365 d,on January 1,2017for the validation period of the initial water level,flow field,set the validation period for 365 d,according to the master's in shenyang actual hydrogeological conditions and related project experiences,after repeated adjustment parameter correction numerical model,makes the simulation flow field of the numerical model and the actual flow field,the water level control in the scope of permissible error.The distribution of groundwater before and after the water supply expansion of dahuofang reservoir in shenyang city is compared by using the numerical simulation model of water flow.By selecting a certain number of observation Wells at the key locations of the study area,the specific conditions of the groundwater level in each location of shenyang city were collected,and on this basis,the variation rules of the groundwater level of each well before and after the expansion of the water supply to shenyang by the dahuofang reservoir were reasonably analyzed by using the numerical model and relevant experimental data.In this paper,three kinds of groundwater exploitation schemes are put forward,and the prediction and comparative analysis of the three schemes are carried out.According to scheme one,three kinds of rainfall schemes are selected,that is,high water period,low water period and normal water period.The wet season corresponds to the rainfall in Shenyang in 2007,the dry season corresponds to the rainfall in Shenyang in 2015,and the normal season corresponds to the rainfall in Shenyang in 2013.The dynamic changes of groundwater table in the first scheme under three rainfall schemes are predicted.The prediction results show that the decline speed of groundwater level is obviously slowed down in high water period,and the groundwater level rises a little far away from Hunhe water source area,while in the normal water period,the groundwater level continues to drop,and the situation of downfall funnel in urban area is not effectively controlled.In the low water period,the groundwater around Hunhe River tends to be stable at last because of the recharge of surface water.This paper evaluates the impact of urban water supply on groundwater environment and provides some reference for future urban construction and regional groundwater environment study in shenyang. |
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