Study On The Characteristics Of Groundwater System In The North Of Xingguo County,Jiangxi Province

Groundwater is the main source of domestic water for residents in the northern part of Xingguo County,the old district of southern Ganzhou.Groundwater plays an important role in safeguarding people's lives,promoting social and economic development,and maintaining ecological balance.This paper relies on the geological and hydrogeological survey of the research area and the geology and hydrogeological data of the research area,based on the geological and hydrogeological survey items of the China Geological Survey Bureau?No.DZ20179262?,through field hydrogeology and environmental geological survey and synthesis.Analytical research,divided the water-bearing rock group and groundwater type,determined the five-level and six-level groundwater systems,and discussed the corresponding groundwater dynamic conditions and hydrogeochemical characteristics,the underground runoff modulus method and the precipitation infiltration coefficient method were used to calculate the groundwater recharge in the study area,and the following research results were obtained.?1?The water-bearing rock group in the study area includes loose rock-like pore-water-bearing rock group,clastic rock-like pore-fractured water-bearing rock group and magmatic rock metamorphic rock-like fractured water-bearing rock?including magmatic rock fissure water-bearing sub-group and metamorphic rock fissure water-bearing sub-group?three major categories.?2?The Quaternary groundwater has a hydraulic connection with the river water;the granite and metamorphic rock weathering fissure water is more affected by the climate,and the groundwater level dynamics are directly related to the rainfall,The river in the dry season mainly receives groundwater recharge.?3?The permeability coefficient of the Quaternary loose layer aeration zone is 25.0m/d.The permeability coefficients of the upper soil layer of the Cretaceous glutenite,granite,Cambrian and Sinian residual sandstone weathering crust are 0.60 m/d and 0.27-2.14 m/d,0.30 m/d and 1.46 m/d.The permeability coefficients of aquifers in the loose rock-like pore-water-bearing rock group,the clastic rock-like pore-fractured aquifer group,and the magmatic rock metamorphic rock-like fractured water-bearing rock group are 25.8-44.09 m/d,1.07 m/d,0.13-4.15 m/d.?4?Divide the study area into 5 five-level groundwater systems of Lianjiang,Suishui,Jianshui,Shuichashui and Wushuhe;further divide the Suishui system into Taijiang,Rentian,Changlong,Jiaofu and Wenxi 5 A six-level groundwater system;confirmed the recharge,runoff,drainage characteristics and water chemistry characteristics of different groundwater systems.?5?The formation of groundwater chemical type is the result of the interaction between groundwater and rock.The chemical type of groundwater in granite is HCO₃-Ca?Na,and the groundwater chemical types of the Cambrian,Sinian and Qingbaikou metamorphic rocks are HCO₃-Ca?Mg type,HCO₃-Ca type and HCO₃-Ca?Na type.?6?The calculation of groundwater recharge indicates that the recharge of the Lianjiang groundwater system is 501400 m³/a,the groundwater system for the Suishui is7647800m³/a,the groundwater system for the Jianshui is 2658600m³/a,and the groundwater system for the Shuichashui is 836600m³/a,Wushushui groundwater system is 4294300m³/a,the groundwater recharge in this area is related to the aquifer exposed area and precipitation infiltration coefficient,and the natural total recharge of groundwater is15650000m³/a.Based on the above research results,a conceptual model of the groundwater system in the study area was established.These research results can provide a scientific basis for the planning,development and utilization of groundwater resources in Xingguo County,Jiangxi Province.