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Different Dispatching Modes in Response to Downstream Reaches of Late Sediment-Retaining Period of Xiaolangdi Reservoir
Pages: 14-16
Year: Issue:  11
Journal: Yellow River

Keyword:  late sediment-retaining periodoperational modephysical fluvial modelXiaolangdi ReservoirLower Yellow River;
Abstract: In this paper,two modes had been chosen as the dispatching modes during late sediment retaining period of Xiaolangdi Reservoir,which were gradually raises the use of retaining coarse sediment and flushing fine sediment (mode I)and years of sediment adjustment and precipitation washout (mode II). Also,with physical fluvial model,studies on river regime,scour and silting evolution,flood water level and floodplain security of reaches downstream the Yellow River had been conducted during the late sediment retaining period. The results show that a)during the water sediment regulation period and the flood seasons,for mode II,the peak flow continues,the zigzag peak reduces,the sand peak and the flood peak occur at the same time and the occurrence probability of small water with large sediment decreases. b)The adjustment of river regime in mode II is quickly than that in mode I and the adjustment occurring every year is very favorable to the long-term stability of the existing braided river regime. c)In mode II,the river siltation is significantly small and the percentage of floodplain deposition account for the whole river siltation is small, which is favorable to the long-term maintenance of the existing lower Yellow River. d)The increase of water lever with the same water discharge is quite small in mode II than in mode I,which is favorable to the flood safety. e)In mode II,the inundations range and the deposition account is sig-nificantly small.
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