| 李建柱,冯平.降雨因素对大清河流域洪水径流变化影响分析[J].水利学报,2010,41(5): |
| 降雨因素对大清河流域洪水径流变化影响分析 |
| Effects of precipitation on flood variations in the Daqinghe River basin |
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| DOI： |
| 中文关键词: 洪水 降雨量 降雨强度 暴雨空间分布 下垫面变化 |
| 英文关键词: floods rainfall depth rainfall intensity spatial distribution of rainstorms underlying surface change |
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| 中文摘要: |
| 选择海河流域大清河水系的两个子流域，对其洪峰和洪量的变化趋势进行了分析，统计了1956—1980 年和1981—2005 年两个时段一定频率洪水发生的次数，发现两个子流域洪水次数和量级呈减小的趋势。分析了降雨因素对洪水变化趋势的影响，结果表明，次降雨量和降雨强度均有减少趋势，一定频率降雨发生的次数在1981—2002年比1956—1980 年有明显的减少，汛期降雨量也呈减少趋势，暴雨空间分布发生了一定的变化，这些降雨因素对洪水次数和量级的减小具有一定的影响。此外，流域土地利用变化和土壤最大蓄水容量增加也是导致洪水量级减小的主要因素。 |
| 英文摘要: |
| The variation trends of flood peaks and volumes in two sub-catchments of the Daqinghe River basin in Haihe River basin were analyzed. The number of occurrences of floods during 1956 － 1980 and 1981 － 2005 was calculated. It was found that the number of occurrences，flood volumes and peaks decreased. The influence of precipitation on floods was studied，and the results showed that the largest rainfall depth and intensity have the tendency of reducing，the number of occurrences for rainfall during 1981 － 2005 was less than that during 1956 － 1980. The rainfall depth in flood season also showed a trend of reduction，and the spatial distributions of rainstorms changed. All of these factors result in the decrease of flood magnitude in the Daqinghe River basin. The change of land use and the increase of soil moisture storage capacity also lead to the decrease of flood magnitude. |
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