| 含沙量和悬沙粒径变化对长江宜昌-汉口河段年冲淤量的影响 |
| |
| 引用本文： | 许炯心.含沙量和悬沙粒径变化对长江宜昌-汉口河段年冲淤量的影响[J].水科学进展,2006,17(1):67-73. |
| |
| 作者姓名： | 许炯心 |
| |
| 作者单位： | 中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室, 北京, 100101 |
| |
| 摘 要： | 依据三峡水库修建以前的资料,运用数理统计方法对含沙量和悬沙粒径变化对长江宜昌-汉口河段年冲淤量的影响进行研究,以期为三峡水库修建以后库下游河道冲淤特性的预测提供参考。建立了1980-1997年间宜昌-汉口#河段年冲淤量与宜昌站年均含沙量C宜昌之间的回归方程,据此估算出使宜昌-汉口#河段处于不冲不淤状态的宜昌站临界年均含沙量为0.734 kg/m3。以宜昌-汉口冲淤量作为因变量,以宜昌站的含沙量、悬沙中径D50、最大流量和三口分流比作为影响变量,建立了多元回归方程。基于1980-1997年资料的方程表明,宜昌站含沙量越高,悬沙中径越粗,宜昌站洪水流量越大,宜昌-汉口河段年淤积量越大;三口分流比越小,宜昌-汉口河段年淤积量越大。
|
| 关 键 词： | 河道泥沙淤积 含沙量 悬移质泥沙粒径 长江 |
| 文章编号： | 1001-6791（2006）01-0067-07 |
| 收稿时间： | 2004-11-01 |
| 修稿时间： | 2005-02-20 |
Influence of variations in suspended sediment concentration and grain size on sediment deposition of Yichang- Hankou reach of Yangtze River |
| |
| XU Jiong-xin.Influence of variations in suspended sediment concentration and grain size on sediment deposition of Yichang- Hankou reach of Yangtze River[J].Advances in Water Science,2006,17(1):67-73. |
| |
| Authors: | XU Jiong-xin |
| |
| Affiliation: | Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China |
| |
| Abstract: | Based the data measured before the construction of the Three Gorge Dam and using the empirical statistical approaches, this paper studies influence of variations in suspended sediment concentration and grain size on the sediment deposition of Yichang-Hankou reach of Yangtze River.And a regression equation between the annual sediment deposition in the Yichang-Hankou reach and the annual average suspended sediment concentration(C_(mean,Yichang)) at Yichang station is established in 1980-1997.According to this equation,a threshold of C_(mean,Yichang) is estimated as 0.734 kg/m~3,at which this river reach is in a non-scour and fill state. A multiple regression equation is also established,which relates the annual sediment deposition in the Yichang-Hankou reach and the influencing variables including the annual suspended sediment concentration,median grain size of suspended load and annual flood at Yichang station,and the ratio of the flow diverted through the "three outfalls" to the total.The equation based on the data in 1980-1997 indicates that the sediment deposition in Yichang-Hankou reach increased with the increases in sediment load,median grain size of suspended sediment and annual flood at Yichang station,and with the decrease in the ratio of the flow diverted through the "three outfalls" to the total. |
| |
| Keywords: | channel sediment deposition sediment concentration grain size of suspended sediment Yangtze River |
| 本文献已被 CNKI 维普 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》下载全文 |
|
