| 摘要: |
| 湘江下游长沙段受湘江来水、长江来水以及洞庭湖区顶托多重影响，水文特征非常复杂。自2003年三峡水库蓄水以来，长沙段干旱严重，水位不断刷新历史最低水位。为了解三峡水库蓄水运行对湘江长沙段低水位的影响，从湘江长沙段水位流量关系、月均水位变化规律以及长沙站出现年最低水位时的水文情势多个方面进行分析研究。研究结果表明，近20年来，长沙站同流量下水位、月均水位和最低水位均呈下降趋势。三峡水库蓄水后，城陵矶站枯水位略呈抬高趋势，湖区出口水位抬高对缓解长沙段的旱情是有利的，因此长沙站水位连创新低与三峡水库蓄水运行无直接关系，湘江干流枢纽运行以及长沙段人为采沙引起河床下切是长沙站最低水位连创新低的主要原因。 |
| 关键词: 湘江下游 月均水位 最低水位 三峡工程 |
| DOI： |
| 分类号:12 |
| 基金项目:交通运输部建设科技项目（2011 328 000 1570） |
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| Analysis of variation in water level of Changsha reach in Xiangjiang River |
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XU Zu-huai1, CHEN Zhang-ying2, ZHANG Xing-nong2, GE Yao2
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1.Hunan Province Administration of Water Transportation;2.Nanjing Hydraulic Research Institute
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| Abstract: |
| The Changsha reach, situated at the downstream of the Xiangjiang River， is influenced by the combinational hydrologic characteristics of the Xiangjiang River and the Yangtse River as well as the Dongting Lake. Since the impoundment of the Three Gorges reservoir， the Changsha reach has suffered so severe drought, which has resulted in the water level decline, which has broken the historical lowest records. According to the variation of the relationship between water level and discharge, the monthly average water level and the lowest water level， the variation law of the low water level in the Changsha reach and the impacts given by the impoundment of the Three Gorges reservoir on the low water level are studied in this paper. The results indicate that the water level under the same discharge, the monthly average water level and the lowest water level all decreased year by year. The lowest water level along the Changsha reach has no direct relationship with the variation in the water level after the impoundment of the Three Gorges reservoir， but with the riverbed entrenchment caused by the running of the hydroprojects located on the Xiangjiang River and the disordered sand mining in the river. |
| Key words: downstream of the Xiangjiang River monthly averaged water level the lowest water level the Three Gorges reservoir |
