林地坡面的水动力学特性及其阻延地表径流的研究

Study on the Dynamic Characteristics of Overland Flow and Resistance to Overland Flow of Forested Slopeland

该文探讨了坡面水流的流态问题，通过野外试验分析，对经典的雷诺数流态区分理论提出了质疑，阐明了坡面流是介于层流和紊流之间的一种特殊水流运动。用运动波、扩散波近似理论模型，导出了人工降雨条件下林地坡面汇流、退水曲线方程的数学模型。并利用人工降雨试验资料，得出了试验区８种不同林分的坡面阻水指标和阻滞径流时间。该文的研究成果在我国尚属首次。

Overland flow deals with some singnificant problems such as the mathematic expressionof flow parameters and erosion principle of overland flow. Through the analytical result of fied ex-periment,it is indicated that the zomng theory of flow pattern is inappropriate with classic RenoldsNumber.With the help of approximate theory models(kinetic wave and diffusion wave),a theoryequation has been derived, which can determine the confluent time of overland flow on forestedslopeland under the condition of simalated rainfall ,by use of recession flow curve equation and ex-perimental data of simulated rainfall,the index of resistant flow of eight types of forest stands andthe delayed time has been determined.