| 三峡水库蓄水以来长江中下游干流河床沉积物粒度变化的初步研究 |
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| 引用本文： | 徐晓君,杨世伦,张珍.三峡水库蓄水以来长江中下游干流河床沉积物粒度变化的初步研究[J].地理科学,2010(1). |
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| 作者姓名： | 徐晓君 杨世伦 张珍 |
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| 作者单位： | 华东师范大学河口海岸学国家重点实验室;上海市浦东教育发展研究院; |
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| 基金项目： | 国家自然科学基金创新研究群体项目(40721004);;科技部国家重点实验室科研业务课题(2008KYYW01) |
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| 摘 要： | 于2008年在宜昌至徐六径之间的1600km干流河道进行30个横断面取样和分析,与前人于三峡水库蓄水前的取样分析资料进行对比。结果表明:①三峡水库蓄水以来坝下游约400km的干流河床(宜昌至城陵矶)沉积物出现全程粗化,越近大坝粗化越明显,这种沉积物粗化与水库蓄水后坝下游河床出现的强烈侵蚀密切相关;②蓄水前后城陵矶以下的1200km干流河床沉积物粒度的沿程趋势基本一致;③蓄水后河床沉积物仍保持沿程向下游变细且越近河口变化越缓慢的格局。
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| 关 键 词： | 沉积物 粒度 三峡水库 长江 |
Variation in Grain Size of Sedimentin Middle and Lower Changjiang River Since Impoundment of Three Gorges Reservoir |
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| XU Xiao-jun,YANG Shi-lun,ZHANG Zhen.Variation in Grain Size of Sedimentin Middle and Lower Changjiang River Since Impoundment of Three Gorges Reservoir[J].Scientia Geographica Sinica,2010(1). |
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| Authors: | XU Xiao-jun YANG Shi-lun ZHANG Zhen |
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| Institution: | 1.State Key Labotory of Estuarine and Coastal Research;East China Normal University;Shanghai 200062;2.Shanghai Pudong Institute of Education Development;Shanghai 200135 |
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| Abstract: | As the core of fluvial geomorphology,sediment parameters reflect the sedimentary environment in river system.The impoundment of the Three Gorges Dam (TGD) is a doubtless inducement of the erosion of the middle and lower Changjiang (Yangtze) River channel.Compared the sediment samples data collected before TGD and after TGD,we dig out some rules which reflect the impact of the TGD.The results show that 1) caused by the erosion,the grain size of sediment coarsened intensively from Yichang to Chenglingji.Where... |
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| Keywords: | sediment grain size Three Gorges Dam Changjiang River |
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