Laboratory steady state flow tests on multidimensional recharge well with filter layer

The recharge well with filter layer is a common device using for recharging groundwater on the Jiaodong Peninsula in Shandong Province of China, and composed of recharge well and pool. By analyzing the problems of the existing recharge wells with filter layer, a group of multidimensional recharge wells with filter layer are designed, which are of a large single-well recharge volume and the advantages of siltation prevention, prevention of wast water recharge and scour resistance. The theoretical formulas and parameters of the single-well recharge volume for multidimensional recharge wells with filter layer are also given. Meanwhile, the laboratory steady state flow recharge test device is developed. The laboratory steady state flow tests on ordinary recharge well, existing recharge well with filter layer and multidimensional recharge wells with filter layer are carried out. The following conclusions are drawn: (1) Under the same conditions, compared with that of the existing recharge well with filter layer, the single-well recharge volume of multidimensional recharge wells with filter layer increases by 370%~420%; (2) The shape of multidimensional recharge wellhead affects single-well recharge volume, and single-well recharge volume of the round multidimensional recharge wellhead is the largest in the same flow section area; (3) The single-well recharge volume is the largest in the first test, and gradually decreases and tends to be stabe with the increasing number of tests; (4) There is a nonlinear relationship between the single-well recharge volume and the inflow section porosity of multidimensional recharge wellhead, and the inflow section porosity is suitable for 20%. The study is of significance for improving the recharge capacity and calculating the single-well recharge volume quantitatively.