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工程堆积体标准小区界定与可蚀性因子改进
Authors
丁新辉
吴媛媛
+3 more
谢永生
赵暄
马洪超
Publication date
1 January 2016
Publisher
Abstract
将USLE模型应用于工程堆积体侵蚀预报时结果偏差较大,这是因为其标准小区与土壤可蚀性因 子不适合直接应用于工程堆积体侵蚀预报。针对这一问题,结合对我国6大水蚀类型区工程堆积体参数 的调查、统计、分析,界定工程堆积体标准小区的坡度、坡长;结合国内外已有研究成果,分析论证堆积体可 蚀性因子的改进办法,并引用相关数据验证其可行性。结果表明,6大区域工程堆积体坡度、坡长及坡面物 质组成均与USLE中规定的标准小区相差较大;为了尽量消除误差,建议工程堆积体标准小区坡度采取众 数35°,坡长采取平均值5m;堆积体可蚀性因子更名为土石质因子Tr,并将单位体积土石混合体中石砾总 表面积Cs,作为石砾因素指标纳入堆积体土石质因子Tr中,与堆积体物质中土壤可蚀性因子K 共同构建 工程堆积体土石质因子函数。验证结果表明,堆积体可蚀性因子改进办法是可行的。工程堆积体坡度、坡 长的界定及可蚀性因子的改进,对提高基于USLE模型的堆积体侵蚀预报精度有重要意义。</p
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Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources
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Last time updated on 20/05/2019