Impact of Water and Sediment Regulation on Downstream Fish in the Yellow River
The synergy between water-sediment regulation(WSR)and ecological protection in the Yellow River has become the focus of at-tention.In order to understand the impact of the WSR on fish,this research carried out water ecosystem monitoring during the WSR in 2023,and initially discussed the main pathway,scope,time limit and extent of the impact on fish.The results show that the effect of WSR on aquatic organisms is limited to the sediment discharge period.The sudden increase of sediment content and the rapid decrease of dissolved ox-ygen(DO)in water are the main factors that adversely affect fishes and their habitat conditions.The drainage of high sediment content water body from Xiaolangdi Reservoir is the main cause of the"flowing fish"below the dam,which can be divided into three forms of mechanical injury death of fish in the reservoir,asphyxiation death of fish under dam and"gasping for air"of fish below the dam.With the rapid de-crease of sediment content along the way,the"flowing fish"phenomenon is gradually weakened and basically is disappeared to the Yiluo es-tuary.After the completion of WSR,the impact on aquatic organisms is disappeared.And two months later,the total quality of fish can be basically restored to the level before WSR.
water and sediment regulationaquatic organismsfishsediment concentrationDOYellow River
国家科技期刊平台
NSTL
万方数据
维普
