The Experimental Research On Feasibility Of Tubewell Groundwater Recharge In A Northern City

Aquifer is a natural underground reservoir..Due to the rapid expansion of city and growth of population as well as unwise exploitation of groundwater,water shortage has become a predicament to the city's development.Confronted with the severe shortage of water,it's become urgent to make some water conservation policies.At the meantime,the artificial recharge of ground water is not only a brand-new water management technology that can resolve this issue effectively,but also a practical technology which combines surface water with groundwater and prevents over-exploitation of groundwater.It can not only help to resolve the water shortage issue so as to make it more balanced between supply and demand,but also eliminate the funnel phenomenon which is resulted from over-exploitation of groundwater,with which,it contributes greatly to improve the ecological environment and water supply efficiency.The author in this experiment applies the tubewells recharge technology,makes a monitoring on changes in the amount of tubewells recharge,water level within recharge wells and regional monitoring wells,changes on water quality,and makes an analysis and research on tube wells recharging capacity and the influence of recharge on groundwater levels,water quality and so on.In addition,the author makes a calculation on associated hydro-geological parameters(such as permeability coefficient,hydraulic conductivity,etc.)and recharge ability,with aim to provide technical support to recover and conserve groundwater via the large-scale implementation of tubewell recharge after the South-To-North water diversion water is diverted to Beijing.The experiments were carried out in two tap water factory:hereinafter referred to as Factory A and Factory B respectively in a northern city.The experiments in Factory A indicate that:the water recharge has an influence on the dynamic field of underground water in the experimental area of Factory A;The recharge water amount stabilizes at 120 m~3/h in the recharge well of Factory A;The recharge experiments have a positive influence on downstream well water quality,which means it can improve the water quality of the underground water which flows from upstream to downstream;The experiments carried out in Factory B South well indicate that:the radius of influence the recharge experiments have is 1585 m;steady recharge capacity is up to65 m~3/h;The recharge water has a positive influence on the underground water quality of the surrounding area;The experiments carried out in Factory B North well indicate that:the radius of influence the recharge experiments have is 1365 m;the recharge water amount stabilizes at 239 m~3/h during the experiments on the North Well,recharge amount does not decrease,the recharge water amount stabilizes at 242 m~3/h;If the South-to-North Water can be treated with recharge water from source well,well,the surface water quality can be greatly improved.Besides,it requires less engineering modification and can prevent the loss of recharge water effectively.It's feasible to recharge the underground water.