试验性蓄水期嘉陵江长江交汇河段的冲淤特性

发布时间：2018-03-12 21:47

本文选题：三峡工程　切入点：变动回水区　出处：《武汉大学学报(工学版)》2017年01期 　论文类型：期刊论文

【摘要】：变动回水区河段的侵蚀基准面在蓄水期抬升,在消落期和汛期逐渐恢复为天然状态,其冲淤调整特点不同于自然条件.以三峡库区嘉陵江与长江交汇河段为例,分析了175m试验性蓄水期前后交汇河段冲淤特性的变化.结果发现,175m试验性蓄水以前,交汇河段由于上游来沙持续减少出现了累积性冲刷,175m试验性蓄水以后,侵蚀基准面的抬升抑制了交汇河段的冲刷发展态势;其中支流嘉陵江来沙量减少的程度高于长江干流以及2008-2012年汛期汇流比大于2003-2007年,使得嘉陵江支流河段继续冲刷,而长江干流河段转为淤积.175m试验性蓄水前后交汇河段年内汛淤枯冲的基本规律未变,但主要走沙期由汛后推迟到了次年的水位消落期,走沙量减少.
[Abstract]:The erosion datum level of the reach in the variable backwater area is uplifted during the water storage period and gradually restored to its natural state during the fall and flood periods, and the characteristics of its scouring and silting adjustment are different from those of the natural conditions. Taking the intersection of Jialing River and the Yangtze River in the three Gorges Reservoir area as an example, The characteristics of scour and deposition in the junction reach before and after the 175m experimental storage period are analyzed. The results show that before the 175m experimental impoundment, the cumulative scour erosion and 175m experimental impoundment occurred in the intersection reach due to the continuous reduction of upstream sediment. The uplift of erosion datum level has restrained the development trend of scour in the intersection reach, in which the amount of sediment coming from Jialing River is lower than that of the main stream of the Yangtze River and the ratio of runoff in flood season from 2008 to 2012 is larger than that of 2003-2007, which makes the tributaries of Jialing River continue to scour. However, the basic rules of flood and silt erosion in the junction reach before and after the experimental impoundment of 175m are not changed, but the main sediment transport period is postponed from the flood to the water level drop period of the following year, and the sediment transport volume decreases.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;长江科学院;
【基金】：国家自然科学基金资助项目(编号:51209016;10932012)
【分类号】：TV147

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