| 摘要: |
| 在已建水库下游河床冲刷泥沙数学模型的基础上,针对宜昌-沙市河段的河道特性,修改并建立了能够反映该河段水沙运动特性的一维水流泥沙数学模型.在此基础上,进行了三峡建库后,前20年内宜昌-沙市河段的一维水沙运动及河床冲淤计算.计算结果表明,三峡建库后,在水库运用至第10年,宜昌-沙市河段的沙层覆盖层几乎冲光,之后主要以砾、卵石层面粗化下切为主,当水库运用到第5年以后,芦家河以下河段逐渐出现了一些局部水面比降较陡的现象,沙市水位下降的越多,这一现象越为明显,对于船舶航行条件将有一定的影响. |
| 关键词: 三峡工程 冲刷 泥沙 |
| DOI：10.18307/1997.0405 |
| 分类号: |
| 基金项目: |
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| Prediction of river-bed scouring between Yichang and Shashi at the lower reach of the Three-Gorge Project |
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Chen Yuanfang1, Gao Kaichun2
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1.Institure of Planning and Design of the Changjiang Waterway Bureau, Wuhan 430010;2.The Changjiang Waterway Bureau, Wuhan 430010
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| Abstract: |
| Based on the existing sediment mathematical model on the river-bed scouring at the lower reach of the Three-Gorge Project (TGP), an one-dimension mathematical model on the stream load is revised and set up after analysing the characteristics of the the river course from Yichang to Shashi. The revised model reflects the quality of water regime and sand transportation in the corresponding river course. The results given predict the river-bed scouring within 20 years that the Three-Gorge Reservoir is built. In the following ten years after building the Three-Gorge Reservoir, The overburden sand layer on the river bed between Yichang and Shashi will be almost washed away, resulting in a high roughed bed. The undercutting of the garvel and pebble bed will dominate. In the 5th year and later on when the Three-Gorge Reservoir is put into operation, the slope at some local surface of the river-bed beyond Lujiahe will be seen greater, the water level at Shashi dropped more. The more apparent phenomenona will inevitably affects the conditions for shipping. |
| Key words: Three-Gorge Project sediment shipping |
