论文部分内容阅读
1 问题的提出 土壤是降雨径流侵蚀力作用的对象。土壤相似是土壤侵蚀模型实验中,除降雨相似外的又一重要单值条件。但由于问题的复杂性,迄今未见这方面研究的报道。以往的土壤侵蚀实验,因缺乏严密的相似指标约束,或多或少地存在一些模型误差。提高土壤侵蚀资料的可靠性和精确性,已成为一项紧迫的任务。随着研究的深入和经费的限制,人们开始尝试缩小比尺的模型实验,这就使土壤相似性问题的研究愈加迫切起来。本文首次运用相似理论和侵蚀力学原理,解析土壤受蚀现象的物理过程,导出支配该过程的相似准则,进而提出土壤1:1模拟的相似条件,并指出土壤不宜做缩小比尺的模拟。
1 PROBLEM PROPOSED Soil is the object of rainfall-runoff erosivity. Soil similarity is another important single-valued condition in the experiment of soil erosion except rainfall similarity. However, due to the complexity of the issue, so far no report on this aspect has been reported. In the past, the soil erosion experiments were more or less inaccurate due to the lack of strict similarity index constraints. Increasing the reliability and accuracy of soil erosion information has become an urgent task. With the deepening of research and funding constraints, people began to try to reduce the scale model experiments, which makes the study of soil similarity issues more urgent. In this paper, we use the theory of similarity and erosion mechanics for the first time to analyze the physical process of soil erosion and derive the similar criteria governing the process, and then put forward the similar conditions of 1: 1 soil simulation and point out that the soil should not be used to simulate the reduction scale.