JIAO Ju-ying,MA Xiang-hua,WANG Fei,et al.Regional Variation Features of Sediment Yield Intensity in the Wei River Basin[J].Research of Soil and Water Conservation,2004,11(04):60-63.
渭河流域侵蚀产沙强度的区域分异特征
- Title:
- Regional Variation Features of Sediment Yield Intensity in the Wei River Basin
- 分类号:
- S157
- 摘要:
- 根据渭河流域水文站的泥沙观测资料，采用“水文—地貌法”，将渭河流域划分为132个侵蚀产沙单元，计算分析了渭河流域侵蚀产沙强度的区域分异特征。渭河流域的多年平均侵蚀产沙强度为4459.2t/（km2·a），产沙量为5.2亿t/a；≥5000t/（km2·a）的强度侵蚀面积平均为5.2亿km2，占全流域总面积的44.3%；主要侵蚀产沙区位于渭河南河川及天水以上的黄土丘陵沟壑区、泾河庆阳以上的大部分地区和杨家坪以上的部分地区、
- Abstract:
- Based on the distribution of the hydrological station and the different soil erosion type area, 132 soil erosion units was divided in the Wei River basin. According to the observation data of sediment, the spatial variation features of sediment yield intensity in the Wei River basin were analyzed. The annual average sediment yield intensity was 4 459.2 t/(km2·a), sediment yield was 5.2×108 t/a, the violence erosive area with erosion modulus ≧5 000 t/(km2·a) was 5.2×104 km2, the area of it made up 44.3% of the total area of the Wei River basin. The main sediment area were distributed in the loess hilly and gully region above Nanhechuan and Tianshui in Wei River, the area above Qingyang and Yangjiaping in the Jing River, and arid loess hilly and gully region above Liujiahe in the Beiluo River, the sediment yield intensity were 6 000～10 000 t/(km2·a), and the area of the main sediment area made up 39.1% of the total area of the Wei River basin. Because of the severe soil loss in the upper reaches in the Wei River basin, the silt in river bed in the lower reaches was serious gradually, and lead to potential risk of flood hazards, threaten to the safe of the lower reaches of the Wei River and the Huanghe River. So the soil and water conservation in the Wei River is very important, especially in the main sediment area in the upper reaches. The study of regional fitness of soil and water conservation measures and their collocation should be stressed, the dynamic and real-time observation of soil and water loss should be implemented.
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备注/Memo
收稿日期:2004-7-10;改回日期:。
基金项目:国家自然科学基金重点项目（40335050）；中国科学院知识创新重要方向项目（KZCX3-SW-422）；中国科学院水利部水土保持研究所学科前沿科研专项经费资助项目
作者简介:焦菊英（1965- ），女，陕西宝鸡人，博士，研究员，主要从事水土保持的环境效应研究。