论文部分内容阅读
在回顾前人研究成果及分析土壤侵蚀模型试验特点的基础上,提出了黄土高原小流域沟道坝系模型设计的方法。认为在水力侵蚀最活跃的黄土高原地区,降雨强度是影响产流产沙的关键因子,从而需要抓住降雨与侵蚀产沙这对主要矛盾,根据降雨侵蚀空间或时间的集积效果来实现模型流域与原型流域产沙特征的相似。为保证沟道坝系地貌演变相似,除降雨历时遵循重力相似条件外,模型降雨产沙关系还应通过借助天然资料率定产沙量比尺的途径与原型相对应。
On the basis of reviewing the predecessors’ research results and analyzing the characteristics of soil erosion model tests, a method of designing channel dam models for small watersheds in the Loess Plateau was put forward. It is considered that rainfall intensity is the key factor affecting the runoff and sediment production in the loess plateau where water erosion is the most active. Therefore, it is necessary to grasp the main contradiction between rainfall and erosion and sediment yield, and to achieve the model catchment according to the effect of rainfall erosion space or time Similar to the sediment-producing characteristics of the prototype basins. In order to ensure that the evolution of the trench dam system is similar, the relationship between rainfall and sediment yield should follow the prototype through the method of determining the sediment yield by natural data.