渗流井辐射管-含水层间水量交换数值模拟研究

Numerical simulation of the water exchange between radiant tube and aquifer in a seepage well

渗流井取水工程因其高产、高效、低耗、供水成本相对较低等优点被广泛运用,但目前的渗流井取水工程对取水量关注较多,对辐射管-含水层间水量交换系数缺乏研究。为此,通过大型砂槽物理模拟试验,设计不同辐射管仰角、不同辐射管长度、不同渗漏补给能力河流及不同竖井降深共101种试验方案,分析渗流井取水效果的影响因素。对辐射管-含水层间的水量交换系数C1的计算公式进行推导,并利用MODFLOW软件建立数值模型,对部分试验方案进行模拟,并将C1值计算公式应用于模型中,利用试验数据对模型识别验证,并对辐射管-含水层间的水量交换系数C1的计算公式进行验证。最终,确定出辐射管-含水层间的水量交换系数C1的计算公式。

In recent years,the water intake project of seepage wells has been widely used because of its high yield,high efficiency,low consumption and low cost.However,the current water intake project of seepage wells pays more attention to the water yield of seepage wells,and water exchange coefficient between the radiation tube and aquifers is seldom examined.In this study,101 kinds of sand tank test schemes were designed to analyze the influence with different elevation angles of radiant tube,different lengths of radiant tube,different river leakage capacity,and different drawdown of vertical well on the water yield of the seepage wells.The calculation formula of the exchange coefficient between the radiant tube and aquifer is deduced.The partial test plans are simulated by the numerical model using MODFLOW software.The model and the formula of the exchange coefficient C 1 between the radiant tube and aquifer are validated by the test data.The formula of the exchange coefficient C 1 between the radiant tube and the aquifer is also determined.