冲洪积平原渗流和管流耦合的辐射井结构

利用新疆阿克苏台兰河流域冲洪积平原区非稳定流抽水试验资料,以辐射井为研究对象,结合辐射管内的水头损失及流态,建立粗颗粒潜水含水层渗流和水平管流耦合的地下水流数值模型。利用数值模型,分析在粗颗粒含水层中辐射管不同根数、不同长度、等效渗透系数、辐射井的井径以及不同含水层的渗透系数、不同降深对辐射井出水量的影响,并且根据各参数的相互关系,提出冲洪积平原辐射井的出水量的经验公式。为优化设计辐射井结构及辐射井布置提供依据,对台兰河地下水库的建设及后期运行管理提供了技术支撑。

On radial collector well structure of integrating seepage flow and pipe flow in the alluvial plain

The study is based on unsteady pumping tests in a radial collector well in the alluvial plain of Tailan river watershed in Aksu area of Xinjiang.The article develops the numerical model integrating seepage flow and pipe flow,which describes interactions between aquifer,well and horizontal arms.The model also accounts for diverse flow regimes and internal friction losses.Further,the developed model has been applied to simulate the effects of different aquifer hydraulic conductivity,radius of influence,equivalent hydraulic conductivity and drawdown on the yield of radial well in the coarse aquifer.And the proposed empirical equation based on the application of developed model and regression analysis gives a reasonable estimate of yield of radial collector well in the alluvial plain.It is recommended in optimizing lateral configuration and providing the basis for radial collector well arrangement.