论文部分内容阅读
本文对上部为粘土层,下部为不透水层的暗管排水系统的排水提出一个数学解。数学分析以水动力学的流线为依据,参照了实际流网及其相应的边界条件推导出一个新的流量计算公式,并简化为一个近似值的表达式。对地下潜水的非稳定流特性作了研究,提出了其水位随时间而变化的新公式。用此法所获得的结果与按照哈默德,格劳佛和杜姆研究的结果进行了比较。最后推导出一个新的设计公式并以一个实际的示范田间排水问题的解答作示例。
In this paper, a mathematical solution is proposed for the drainage of the underground pipe drainage system with the upper clay layer and the lower impervious layer. Mathematical analysis based on the hydrodynamic flow line, a new flow calculation formula is deduced with reference to the actual flow network and its corresponding boundary conditions, and simplified into an approximate expression. The unsteady flow characteristics of underground diving are studied, and a new formula of water level changing with time is proposed. The results obtained with this method were compared with the results according to the study by Hammad, Glauf and Dumme. Finally, a new design formula is derived and gives an example of the solution of a practical demonstration field drainage problem.