小浪底水库拦沙末期大洪水对温孟滩河段的影响分析

Analysis of Influence of Major Floods on Wenmengtan Reach in the Last Stage of Sediment Retention by Xiaolangdi Reservoir

通过对小浪底水库拦沙运用末期温孟滩河段河床下切较大情况下又遇大洪水的物理模型试验研究，初步认识到温孟滩河段河道整治工程基本能适应大洪水的作用，河势没有出现大的变化；从河底平均高程凋整分析得出，河床冲刷最大河段发生在遂村工程下首至化工工程河段；通过水位涨率和输沙分析，得出温孟滩河段河道整治工程没有明显的滞洪作用；从工程局部冲刷看，赵沟、裴峪工程局部冲刷最严重，经分析表明，冲坑深度不仅与流速有关，而且与工程的入流角关系密切。

It is primarily recognized that river control projects in Werunengtan reach are basically capable to deal with major floodswithout evident change of river configuration through the physical medel experimental study of major floods in Werunengtanreach under the condition of severe bed scouring in the last stage of sediment retention by Xiaolangdi reservoir. Analysis of theadjustment of river bed average elevation shows that the most severe scour is' located in the reach from Lucun to Huagongproject. There is no evident ability of flood retention for river contrnl projects in the reach though analysis of water level risingrate and sediment trasport. Viewing from the local scour, Zhaogou and peiyu projects are with the most severe local scour,and analysis demonstrates that scour depth is not only related to flow velocity but also closely to the angle of flow to the Popectbeing scoured.