橄榄坝电站对下游曼厅大沙坝河段影响研究

摘要

通过建立澜沧江橄榄坝～曼厅大沙坝河段物理模型，研究电站清水下泄对下游曼厅大沙坝河段的影响。在满足模型试验的相似要求前提下，冲刷坑的平面总体形态呈现泪滴形。在开始阶段冲刷坑的深度变化较快，达到一定深度之后，深度变化减小，最终趋于稳定，此时冲刷就达到了平衡状态。丁坝最大冲刷深度和最大冲刷宽度的纵向位置基本一致。%Through the establishment of the Lancang River Ganlanba-Manting Dashaba reach physical mod⁃el,study the influence of plant water discharged to downstream Manting Dashaba reach.Under the premise that meeting the similarity requirements of model test,the overall plane shape of scour hole is teardrop.In the beginning,the depth of scour hole changes quickly.After reaching a certain depth,the chang is slow. When the depth tends to be stable,the scour reaches equilibrium state.The maximum scouring depth of spur dike and the vertical position of maximum scouring width is almost same.