| 三峡水库下游宜昌—昌门溪河段河床调整分析 |
| |
| 引用本文： | 罗优,陈立,许文盛,苏畅.三峡水库下游宜昌—昌门溪河段河床调整分析[J].水科学进展,2011,22(6):807-812. |
| |
| 作者姓名： | 罗优 陈立 许文盛 苏畅 |
| |
| 作者单位： | 1.武汉大学水资源与水电工程科学国家重点实验室, 湖北武汉430072; |
| |
| 基金项目： | 国家自然科学基金资助项目(10932012); 中央高校基本科研业务经费专项资金资助(20082060101000026)~~ |
| |
| 摘 要： | 建立反映河床调整幅度的体幅指标K,分析2003～2008年三峡水库下游宜昌—昌门溪河段河床调整幅度的沿程变化。研究发现该河段K与河段净冲刷强度不成正相关,而是与河道宽深比成正相关,当床沙中值粒径小于0.5 mm时,K与床沙中值粒径成负相关。初步分析认为:三峡下游粗颗粒泥沙容易达到输送饱和状态,当水流挟沙力减小时出现落淤,使得宽浅河段局部出现较大淤积,净冲刷强度较小,调整幅度较大;当床沙中值粒径小于0.5 mm时,该河段河床冲刷以悬移质输沙为主,河床组成越细,被冲刷的量越大,河床调整幅度也就越大。结合建库前后不同粒径组悬移质输沙量的沿程变化,对水库下游河床粗化方式进行了讨论。
|
| 关 键 词： | 三峡水库 河床调整 河床粗化 挟沙力 |
| 收稿时间： | 2011-01-26 |
Riverbed evolution in the Yichang-Changmenxi reach downstream of Three Gorges Reservoir |
| |
| LUO You,CHEN Li,XU Wen-sheng,SU Chang.Riverbed evolution in the Yichang-Changmenxi reach downstream of Three Gorges Reservoir[J].Advances in Water Science,2011,22(6):807-812. |
| |
| Authors: | LUO You CHEN Li XU Wen-sheng SU Chang |
| |
| Institution: | 1.State Key Lab of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;2.Yangtze River Scientific Research Institute, Wuhan 430010, China |
| |
| Abstract: | An index K,which stands for the extent of riverbed evolution,is proposed and used to analyze the riverbed evolution in the reach of Yichang to Changmenxi.The study finds that K is inconsistent with the net scour intensity,while positively correlated to the ratio of width to depth and negatively correlated to the median diameter of bed material when the diameter is less than 0.5mm.Preliminary analysis shows that: it is easy to reach the state of transport saturation for coarse sediments downstream of the Thr... |
| |
| Keywords: | Three Gorges Reservoir riverbed evolution coarsening sediment carrying capacity |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《水科学进展》浏览原始摘要信息 |
| 点击此处可从《水科学进展》下载免费的PDF全文 |
|
