上荆江枯水位对河床冲刷及水库调度的综合响应

发布时间：2019-05-28 21:11

【摘要】：为系统揭示长江中游近期枯水情势及其对三峡水库蓄水的直接和间接响应,本文以冲刷剧烈、枯水位降幅最大的上荆江为例,通过统计其不同形式枯水位的变化特征,建立了水位下降与河床冲刷、水库不同运行方式的相关关系。结果表明,沙市站同流量枯水位几乎与枯水河槽河床平均高程等幅下降,枝城站枯水位下降幅度较小与本底河床形态、河床粗化及航道整治工程有关。上荆江汛前枯水位降幅、最低水位及极枯水位历时等枯水情势会受到三峡水库补水调度的影响,这种补水效应沿程递减,至沙市站补水调度仍然无法抵消河床下切对枯水位造成的影响。
[Abstract]:In order to reveal the recent dry water situation in the middle reaches of the Yangtze River and its direct and indirect response to the water storage of the Three Gorges Reservoir, this paper, taking the upper Jingjiang River with the largest erosion and the decline of the dry water level as an example, has established the water level drop and the river bed erosion by statistics of the change of the dry water level in different forms. The relationship between different operation modes of the reservoir. The results show that the average elevation of the dry water level of the main station and the dry water level is almost the same as the average elevation of the river bed in the dry water, and the lower of the dead water level in the branch city is related to the bed form of the background, the coarsening of the riverbed and the regulation of the channel. The lower water level, the lowest water level and the duration of the extremely dry water level of the upper Jingjiang River will be affected by the water supply and dispatching of the Three Gorges Reservoir. The effect of the water supply effect on the water supply of the Three Gorges Reservoir is gradually decreased, and the water supply schedule to the water discharge station is still unable to cancel the influence of the lower cut of the riverbed on the dry water level.
【作者单位】：长江水利委员会水文局;中国长江三峡集团公司三峡枢纽建设运行管理局;
【基金】：国家重点研发计划(2016YFC0402301,2016YFC0402101) 水利部公益性行业科研专项经费资助项目(201401021) 国家科技支撑计划课题(2013BAB12B01)~~
【分类号】：TV147;TV697.1

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