黄土坡面土壤侵蚀中溶质随径流迁移的水动力特性研究

通过对比分析坡面水流的水动力参数与径流溶质迁移量间的关系,研究了不同地表状况下黄土坡面土壤溶质随径流迁移的水动力学特性,以求深入了解和认识坡面土壤侵蚀中溶质随径流迁移的本质机理。研究结果表明:不同坡面地表状况下,糙率系数和平均水深之比(n/h)与侵蚀过程中随径流迁移的溶质存在一定的关系,径流溶质Br-平均浓度、径流溶质Br-的平均流失率以及径流溶质Br-的相对流失量均随n/h的增加而减小。径流溶质Br-的平均流失率以及径流溶质Br-的相对流失量与水流水动力学参数n/h具有指数关系。

Study on Hydro-dynamic Properties of Soil Solute in Runoff on Different Loess Slope

It was the fundamental purpose of controlling agriculture no-point pollution to reveal the mechanism of substrate soil solute transported in runoff.To analyze the hydraulic characteristics of overland flow and parameters of soil solute in runoff,the Hydro-dynamic properties of soil solute in runoff on different loess slope was studied in this paper.The aim of study was to go deep into understanding the mechanism of soil solute transference in runoff.The result showed that the quantity of soil solute in runoff had relation to the ratio of roughness coefficient to averaged flow depth on different loess slope.The mean concentration of soil bromide in runoff,the average losses rate of soil bromide in runoff and the relative losses of soil bromide in runoff each of them decreased as the ratio of roughness coefficient to averaged flow depth increased.Both the data for the average losses rate of soil bromide in runoff and the relative losses of soil bromide in runoff to the ratio of roughness coefficient to average flow depth(n/h) respectively fit the form of an exponential curve under the different loess slope.