The definition and connotation of high-efficient sediment transport in the lower Yellow River are put forward.According to the operation mode of Xiaolangdi Reservoir and the functional orientation of river water volume of the Yellow River at different time periods,the flood volume in flood season is defined as the water volume for sediment transport in a narrow sense;The main function of water volume in normal periods of flood seasons and non-flood seasons is to meet the needs of ecology,irrigation,power generation and others,rather than being used as water volume for sediment transport.The quantitative relationship has been established be-tween unit water volume for sediment transport and sediment discharge ratio,as well as sediment concentra-tion,and the quantitative calculation method of high-efficient sediment discharge and sediment concentration index is proposed.The matching index of discharge and sediment concentration to meet the requirements of high-efficient sediment transport under the current river flow capacity is proposed.The calculation method of water volume for sediment transport at Lijin section under the condition of maintaining a certain erosion and deposition level and different sediment discharge in the lower Yellow River is established.The calculation re-sults show that:when the sediment discharge into the lower Yellow River is 300 million tons,the flood water volume for sediment transport at Lijin section for maintaining the annual erosion and deposition balance of the lower Yellow River is 5.62 billion m3 to 6.96 billion m3.
关键词
高效输沙指标/单位输沙水量/狭义输沙水量/黄河下游
Key words
high-efficient sediment transport index/unit water volume for sediment transport/water volume of sediment transport in a narrow sense/lower Yellow River
维普
万方数据