| Zhaozhou county is located in the southwest of Heilongjiang province.It covers an area of 2445 square kilometers and agricultural planting is given priority to with corn.Especially agricultural irrigation relies mainly on the exploitation of groundwater and it is a typical upland irrigation area of Songnen Plain.With western"action"water saving food in Heilongjiang province,the irrigation area of growth,the water requirement in the area study of demands is growing,showing a trend of expanding mining of groundwater,expanding mining may destroy the balance of groundwater,the phenomena of regional groundwater system security.In order to ensure the smooth development of the food and water supply,it is necessary to study the regional groundwater safety pattern.Based on the analysis of regional background and hydrogeological conditions in the study area,the main mining groundwater for diving and confined aquifer two layers.Thickness is 0.5-10m and confined aquifer thickness is15-25m.Based on the analysis of the water use situation in the area,the water requirement of 2020 is 7335.4×104m3,and the water-saving irrigation area is 6532.0×104m3.On the analysis of the hydrogeological conditions,the basis of the study area is divided into:2 layer aquifer groups,flow boundary in constant,heterogeneous isotropic,quasi three dimensional unsteady groundwater flow systems.Using GMS to build a regional numerical simulation model,validation period was January 1,2013 to January1,2015.The permeability coefficient of the submerged aquifer is from 2.5m/d to 8.4m/d,and the water supply is from 0.08 to 0.15.The pressure aquifer is from 50m2/d to225m2/d,the elastic water coefficient is from 3×10-5 to 1.4×10-4.Situation of water demand forecast for 2020 different design scheme,and by using the model of running and analysis of the scheme,the construction of regional groundwater security mode from several aspects,the main contents as follows:1)There are 5 kinds of the sustainable exploitation scheme andone kind of emergency scheme.2)The well'depth is 15-25m,more than 35m in some areas,and the pressure well'depth is65-105m.Concrete and reinforced concrete well pipes are adopted;the pump adopts the is type single-stage single suction centrifugal pump,the flow rate is 151.29600m3/d,the head of delivery is 5-125m.3)Increase the number of monitoring Wells in the western,eastern and northern areas of the area.The density of Shuangfai and Erjing is increased.4)The red lines in study area are 3.2m;different water levels in different water-saving irrigation areas are buried deep. |
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