| 李景保,谢炳庚.论湖南水土流失对水旱致灾能力的放大效应[J].水利学报,2000,31(8):0046-0051 |
| 论湖南水土流失对水旱致灾能力的放大效应 |
| On amplification effect of soil erosion on disaster-causing capacity in Hunan Province |
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| DOI： |
| 中文关键词: 水土流失 致灾能力放大效应 水旱灾害交替 |
| 英文关键词: soil erosion disaster-causing capacity impact enlarged disaster |
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| 摘要点击次数: 1903 |
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| 中文摘要: |
| 本文从灾害学角度上分析了湖南省水土流失对水旱灾害的影响，表明多年的水土流失放大了自然态水旱致灾能力。在气象因素大致相似的条件下水土流失导致：丰水期，地表集流快，产洪量增加，径流系数增大，江湖洪水位壅高且持续时间长；枯水期，水量减少、地表缺水时间延长。其复合效应是使水旱灾害交替演进，以及受灾面积、成灾率和发生频率均呈增大趋势。 |
| 英文摘要: |
| This paper deals with the impact of soil erosion on flooding and drought in Hunan Province. It is shown that the long-term soil erosion has enlarged the natural disaster-causing capacity of flooding and drought. Under the similar climate condition, the forming of runoff is accelerated, the quantity of flood is increased, runoff coefficient becomes larger and the duration of high-water level in river or lake is lengthened during high-water period. contrarily, the runoff is decreased and the duration o water-shortage in land surface is lengthened during low-water period. As a combination of these effects, the occurrences of flooding and drought are alternative and the disasters are aggravated. |
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