摘要
流域面积是综合地表一切要素的黑箱变量,而产沙模数是流域产沙强度的重要体现。自20世纪50年代以来,有关产沙模数随流域面积变化的研究受到了国内外学者的广泛关注。本文对多年来有关该方面的研究成果进行总结、提炼,在此基础上,把产沙模数与流域面积的变化关系划分为5种类型,即负相关关系,正相关关系,先增加后减小的非线性关系,先减小后增加的非线性关系以及无显著关系等,继而对每种类型出现的原因给出了合理的解释;在此基础上,指出产沙模数随流域面积变化的本质原因,即产沙模数随流域面积的变化是对流域内各种因素及因素间相互作用的响应,产沙模数与流域面积之间没有内在的联系,产沙模数随流域面积的增加可以出现任何变化。
Drainage area （A） is a lumped variable as all the environmental variables are involved within it, and specific sediment yield （Ys） is an index of soil erosion intensity of some drainage basin. Since the 1950s, study on the relationships between drainage area and specific sediment yield has attracted attention at home and abroad, and more and more work about Ys-A relationships has been conducted in recent years. Under this condition, the achievements of Ys-A relationships were summarized and analyzed in this paper, and then 5 types of Ys-A relationships were identified,including the direct, the reverse, the firstly increased and then decreased, the firstly decreased and then increased, and no specific relations, followed by reasonable explanations of the 5-typed relationships. The essential reason for the specific sediment yield changes with drainage area was pointed out that it is just the response to functions of the environmental variables in river basins, and there is no essential relationship between specific sediment yield and drainage area. It could be extended that all the possibilities could occur with the increase of the drainage area for the specific sediment yield if transport were changed for a certain river basin. variables influencing soil erosion and sediment
出处
《地理科学进展》
CSCD
北大核心
2008年第6期63-69,共7页
Progress in Geography
基金
国家自然科学基金重点项目(40635027)
治黄专项基金项目(黄水保200651-02)
关键词
产沙模数
流域面积
类型
specific sediment yield
drainage area
type
