摘要
沟蚀研究是土壤侵蚀研究的主要内容之一,地貌临界理论作为地貌学中的重要理论在沟蚀研究中得到了广泛的应用。主要从临界理论在沟蚀研究中的发展过程入手,介绍了国外现有沟蚀临界理论模型研究的主要成果,并指出现有模型的不足,在总结前人工作的基础上,指出了现有临界模型今后的发展方向。
Geomorphic threshold theory, as one of the most important theories in geomorphology, has been applied in prediction of both ephemeral gully and permanent gully. Gully erosion is one of the essential contents in soil erosion . Starting with the developing history of threshold theory in channel erosion, this paper introduced the principal achievement of threshold theory in channel erosion. Under one given climate and land use, channel incision occurs only when SAb ~ t is met, where S is local slope gradient （m/m）, A is the drainage-basin area （ha）, a is a coefficient and b is and exponent. Both a and b show different values in different environments, which is dependent on the dominant process resulting in channel incisison. Because of the influence of human activities, esp. those of linear landscape elements （e. g. , roads, parcel borders, dead furrows）, the actual runoff pattern can be very different from that predicted from topography alone. Therefore, in order to get more account. Despite the diversity of factors in fluencing channel formation, this model has been applied for its simplicity and less input parameters.
出处
《山地学报》
CSCD
北大核心
2005年第5期565-570,共6页
Mountain Research
基金
国家自然科学基金重点项目(40235056)
教育部博士点基金(20030027015)
国家自然科学基金面上项目(40071080)共同资助~~
关键词
土壤侵蚀
临界理论
沟蚀
切沟
soil erosion
threshold theory
channel erosion
gully
