梳子坝切口深度对淤砂形态影响的试验研究

Experimental Study on Configuration of Intercepted Sediment by Comb Dam

通过室内水槽试验,探讨梳子坝切口深度对淤砂形态的影响等,初步分析得到以下几点结论:(1)在全闭塞状态下,坝址附近淤砂高度大致等于坝高,并不受切口深度的影响;在部分闭塞状态下,坝址附近淤砂高度受切口深度的影响非常明显,并有随切口深度的增大而降低的趋势;在不闭塞状态下,坝址附近淤砂高度等于切口深度,是坝前泥砂淤砂的基准点。(2)切口深度影响淤砂长度,随着切口深度的降低,淤砂长度有逐渐减小的趋势。(3)在淤砂形态上,三种切口闭塞状态下都有一个共同的特征:在淤砂区的尾部,有一个陡坡,但陡坡的起点有随切口深度的减小而逐渐后退的趋势。(4)在淤砂形态上,部分闭塞和不闭塞两种状态下还有一个共同的特征:在淤砂区的前端,都有一个缓坡。但部分闭塞时缓坡坡顶(淤砂肩)位置大致相近;但不闭塞时缓坡坡顶(淤砂肩)的位置有随切口深度的减小而变得距离坝址更近的趋势。

By flume experiments indoors ,a series of model experiment which to research configuration of intercepted by different slit depth of comb dam was discussed. Results as follows. （1）Under total blocking circumstance,the intercepted sediment is almost equal to the height of comb dam near foreside of dam body,and is irrelevant to slit dep of slit depth is very obvious near foreside of dam body in part blocking conditions,with slit depth increasing,the sediment he th he ght of effect ght of intercepted sediment will gradually decrease; under slit opening circumstance,the height of intercepted sediment near foreside of dam body is almost equal to the height of comb dam. （2）Slit depth affects the length of intercepted sediment with sllt depth gradually increasing. Length of intercepted sediment will gradually shorten. （3）There is also a common characteristics on configuration of intercepted in three different blocking forms. It has a steep slope at tail of intercepted sediment. With slit depth decreasing,climax point of steep slope become farther. （4）There is a common characteristic on configuration in part blocking and slit opening conditions,it is that there is a flat slope near foreside of dam body. But climax point of flat slope is similar to different slit depth in part blocking condition and it is become farther with slit depth gradually decreasing in slit opening condition.