| 摘要: |
| 石虎塘枢纽是赣江中下游的第3个规划梯级，坝下沙质河床的水位变化不仅与冲刷下切有关，还与下游峡江枢纽的建设运行有关，需要论证坝下水位下降值，以确定船闸下引航道底板高程与电站装机高程.通过动床模型试验研究了坝下沿程水位的变化趋势与水位下降值.结果表明枢纽运行的前3年内水位下降幅度较大，运行9年后坝下水位下降最大约1.14 m，其后坝下水位下降趋缓，且水位下降值与下游峡江枢纽的建设运行时间有关，峡江枢纽运行后，坝下水位下降将很快趋缓，石虎塘与峡江两枢纽建设间隔时间越短、石虎塘枢纽坝下水位的下降越小.试验研究成果为枢纽设计提供了技术支撑，采用水位流量关系中心线确定工程前后同流量水位变化的方法具参考价值. |
| 关键词: 冲积性河流 坝下水位下降 动床试验 石虎塘枢纽 |
| DOI： |
| 分类号:TV131.61+6 |
| 基金项目:交通运输部联合科技攻关项目（2009-353-336-460） |
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| Experimental study on fall of stage downstream of Shihutang hydro-junction on the Ganjiang River |
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CAO Min-xiong1, WU Bin2, LUO Chun3, CAI Guo-zheng1
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1.State Key Laboratory of Hydrology Water Resources and Hydraulic Engineering， Nanjing Hydraulic Research Institute;2.Jiangxi Province Navigational Affairs Reconnaissance Design Institute;3.Jiangxi Province Port and Shipping Administration Bureau
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| Abstract: |
| The Shihutang hydro-junction is the third planned cascade project in the middle and lower reaches of the Ganjiang River. Stage change in the sandy bed channel below the dam is not only associated with riverbed downcutting， but also linked to the construction and operation of the Xiajiang hydro-junction in the lower reach. Therefore， it is necessary to demonstrate the fall of stage below the dam to determine the elevation of the lock floor of the lower approach channel and the installed plant. Mobile-bed model tests are used to study the trend and value of stage change below the dam. The research results show that in the first three-year operation， water level declines dramatically; after nine-year operation， the maximum fall of stage is about 1。14 m， then it declines slightly. Meanwhile， the falling value is related to the operation time of the downstream Xiajiang hydro-junction. When the Xiajiang hydropower station is put into use， stage falling below the dam becomes stable rapidly. The shorter the construction time span between the two stations is， the smaller the stage decline below the Shihutang hydropower station is. The findings provide technical support for the design of the hydro-junction and the analytical method is of reference value. |
| Key words: alluvial stream fall of stage below dam mobile-bed model test Shihutang hydro-junction |
