Riverbed adjustment is mainly depended on incoming water and sediment,and the riverbed bounda-ries.However,the adjustment is highly unbalanced along all the way of the Lower Yellow River(LYR),the evolution of riverbed above Huayuankou(HYK)has a particularly prominent response to changes in water and sediment conditions,with the largest adjustment in sediment erosion and deposition.Based on the analysis on the fluvial processes,flow and sediment propagation,possibility of sediment detention and river channel geomet-rical characteristics,a concept of using the reach upstream of HYK as a natural'reservoir'for sediment re-regu-lation is proposed.Using measured flood data,the flood conveyance ability and allowable sediment retention in river channels under the requirements of varied flood discharge capacities are calculated,the'reservoir'ability for re-regulating incoming sediment of the LYR is evaluated.This research can be used to determine the indices of sediment discharging from Xiaolangdi(XLD)reservoir.It is of great significance for maintaining the effective storage capacity of XLD reservoir,supplementing the sediment supply from riverbed during the subsequent stage of clear water erosion,and improving the unbalanced adjustment of erosion-deposition in the LYR.
关键词
不均衡调整/河槽动态库容/滞沙能力/泥沙反调节库/水沙调控/黄河下游
Key words
unbalanced adjustment/dynamic storage volume of river channel/sediment detention capacity/reservoir for sediment re-regulation/regulation of water and sediment/Lower Yellow River
维普
万方数据