Laboratory Experimental Study On High Efficiency Anti-scouring And Siltation Prevention Type Of Recharge Well With Filter Layer

Recharge well with filter layer is the most important part of ground water recharging projects and it is generally constituted by recharge wells and recharge pools. The main problems of the existing recharge well with filter layer are low efficiency and clogging. And the problems seriously affected the recharge engineering effect and service life.On the improvement and optimization of the existing recharge well, three new internal and external flow section recharge wells with filter layer and the square are designed in the article.The theoretical formula of single-well recharge volume is provided. The article also researches lab recharge testing equipment of recharge well with filter layer and carries out the steady flow recharge experiments with it. And the test results are discussed.The main research contents and the results are as follows:(1)The article analyzes the recharge process of recharge well with filter layer and the various and key affecting factors of recharge volume by investigating and studying the present recharge well with filter layer. Conclusions are as follows: the cross-sectional area and inflow water of present recharge well is small. The present recharge well could be clogged and washed and has short service life. The present recharge well needs to be back filling lots of gravel and building materials and it has high construction and later maintenance cost.(2)Three new internal and external flow section recharge wells with filter layer are designed in the article.Such as internal and external square table form recharge well, internal and external circular form recharge well, internal and external square form recharge well. The part of the recharge pool near the ground was made to timpervious body to prevent low water effluent recharge.(3)The article establish recharge well with filter layer well infiltration process of flow model, the theoretical formula of single-well recharge volume is provided.(4)The article design the recharge well with filter layer indoor test device design.The new infiltration recharge well indoor steady flow test is carried out. The seepage state, recharge volume and recharge efficiency is conclused. Compared with the existing recharge well, under the condition of recharge pool cross sectional area of the same, the volume of the new internal and external flow section recharge well is2.6 times than the existing recharge well with filter layer.(5)Using the test data, the theoretical formula of single-well recharge volume isverified, the article also calculates the synthetical reduction coefficient of recharge well with filter layer is 0.93~0.96, and the synthetical reduction coefficient of the existing recharge well is 0.6. It shows that the well damage of the internal and external flow section recharge well with filter layer well damage is smaller than the existing recharge well.The results of the article offer a variety of new high efficiency recharge well in the ground water recharging projects. The article also provide a theoretical basis of the formula of single-well recharge volume. The recharge volume and the synthetical reduction coefficient can provide a reference for the practical engineering use.Research results for the slightly polluted area in north China and seawater intrusion in coastal region groundwater artificial recharge, improve the effective utilization rate of the rain flood resources utilization has important practical significance. Deficiency,for the internal and external flow section recharge well with filter layer, not yet real well recharge test on site.