半湿润区径流形成的力学分析

本文针对包气带对径流形成的支撑作用，建立降雨径流与地下水埋深的定量变化关系。根据力学原理分析降雨径流过程的作用力形成与变化，提出了径流形成力学分析理论，推导出降雨径流关系与包气带厚度的定量联系。在此基础上，将自然常态下维持稳定的降雨径流关系的包气带厚度定义为产流基准埋深，针对地下水位下降导致地表径流减少定义了地表径流消失临界埋深，完成了上述问题的计算公式推导。以华北平原为典型进行了初步实证研究，分析计算并实证了产流基准埋深，初步提出了地表径流消失的临界埋深，结果表明与实测资料非常吻合。包气带气体压强受土壤条件影响较大，是力学分析的关键，需要进一步深入研究。

Mechanical analysis of runoff generation in semi-humid area

This paper studied the generation and variation of forces during the rainfall-runoff process based on the principle of mechanics and derived the quantitative relationship between rainfall-runoff relationship and vadose zone thickness.On this basis,the thickness of vadose zone,which maintains a stable rainfall-runoff relationship under natural conditions,is defined as the reference groundwater depth of runoff generation.It is used as the original condition to explore the mechanism of rainfall-runoff relationship variation and the critical condition for the disappearance of surface runoff.Finally,a case study was conducted on the North China Plain.The study results show that the air pressure in the vadose zone is the key for mechanical analysis,and further multi-disciplinary researches are needed.