| 李昌志,刘兴年,曹叔尤,张之湘.不同沙源条件下地区前期降雨与小流域产沙关系的对比研究[J].水利学报,2001,32(12):0074-0079 |
| 不同沙源条件下地区前期降雨与小流域产沙关系的对比研究 |
| Research on relationship between ante-precipitation and sediment yield of watersheds with different sediment supply |
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| DOI： |
| 中文关键词: 前期降雨 不同沙源条件 渐变型产沙 突变型产沙 主成分分析 |
| 英文关键词: ante-precipitation different source of sediment gradual sediment yield abrupt sediment yield principal component analysis(PCA) |
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| 摘要点击次数: 1894 |
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| 中文摘要: |
| 为认识在不同沙源条件下前期降雨对小流域产沙的贡献和作用，本文利用不同沙源条件下两个典型小流域(山西砖窑沟流域和云南蒋家沟流域)以及一组篱笆减少侵蚀试验的降雨和产沙资料，选取产期降雨、过程降雨、产沙历时以及雨强因子，运用主成分分析法，进行对比研究，并分析了其机理。结果表明，在符合主成分选取条件下，对砖窑沟渐变型产沙，前期降雨仅是第二主成分的主要贡献者，与降雨性质相比，起次要作用；但对蒋家沟突变型产沙，前期降雨是第一主成分的主要贡献者之一，起首要作用。 |
| 英文摘要: |
| The method of principal component analysis (PCA) is applied to study the factors of sediment yield in order to understand the contribution of ante-precipitation to the sediment yield of watersheds with different conditions of sediment supply. Three data groups of ante-precipitation, rainfall in the process, duration of sediment yielding, rain intensity of two typical watersheds (the Zhuanyao Gully basin, Shanxi Province and the Jiangjia Gully basin, Yunnan Province) and an experimental area are used as variables of PCA. The mechanism of ante-precipitation in sediment yield is studied in detail. The result shows that ante-precipitation is the main contributor of the second principal component and plays a minor role in gradual sediment yield in Zhuanyao Gully. However, it is the chief contributor of the first component and plays important role in abrupt sediment yield in Jiangjia Gully. |
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