水科学进展2017，Vol.28Issue(1)：1-13,13.DOI:10.14042/j.cnki.32.1309.2017.01.001
龙羊峡、刘家峡水库运用对黄河上游水沙关系的调控机制
Effects on flow and sediment in the upper Yellow River by operation of Longyangxia Reservior and Liujiaxia Reservoir
摘要
Abstract
The regulation mechanism of Longyangxia and Liujiaxia Reservoir on runoff and sediment process is one of the key scientific problems to recognize flow and sediment variation in the Yellow River and optimize the reservoir operation modes.According to the located-observation data of water and sediment in Longyangxia and Liujiaxia Reservoirs,this paper analyzes the regulation and effect of reservoir to runoff and sediment process and reveals the controlling mechanism for the relationship between water and sediment.The main understandings achieved are:① The regulation of large reservoir operation on runoff sediment is related to the operation mode of the reservoir.The pluriennial regulation of Longyangxia Reservoir results in the linear regulation of runoff and nonlinear regulation of sediment trans port.The incomplete annual regulation of Liujiaxia Reservoir results in both linear regulation of runoff and sediment;② Reservoir operation on the Regulation of runoff and sediment has a strong disturbance to the downstream water and sediment relation.It broke the sediment law under natural conditions of the river formed by long-term automatically ad justment and changed the constitutive relation of runoff sediment;③ The effects of large reservoir operation on the dynamic mechanism for the relationship of water and sediment regulation mainly reflect in adjusting the dynamic equilibrium conditions of sediment-laden flow in which the shear stress decreased in the process of flood propagation.It makes the critical Froude number increase,resulting in the sediment-laden flow by siltation to increase gradient ratio to meet the critical water shear stress requirements of the Froude number state and reach the steady state of sediment-laden flow to stress the relationship between water and sediment change accordingly.关键词
大型水库/调控机制/水沙关系/宁蒙河段/黄河上游Key words
large reservoir/regulation mechanism/relationship between flow and sediment/Ningxia-Inner Mongolia reach/upper reach of the Yellow River分类
建筑与水利引用本文复制引用
姚文艺,侯素珍,丁赟..龙羊峡、刘家峡水库运用对黄河上游水沙关系的调控机制[J].水科学进展,2017,28(1):1-13,13.基金项目
国家重点基础研究发展计划(973计划)资助项目(2011CB403303) （973计划）
“十二五”国家科技支撑计划资助项目(2012BAB02B03) （2012BAB02B03）
The study is financially supported by the National Basic Research Program of China (No.2011CB403303) and the National Key Technologies R&D Program of China during the 12th Five-year Plan Period(No.2012BAB02B03). （No.2011CB403303）
