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河沟水面线的推算是山区防洪和道路工程建设中经常碰到的一个问题。由于陡坡河道的比降和横断面变化都很大,流速水头的影响已不能忽略,局部损失也经常发生,故往往难以用一般天然河道水面线推求方法推算出陡坡河沟的水面线。为此,本文试图在分析稀性泥石流和洪水水面线实际资料的基础上,选用山区陡坡河道过阻力平方公式来考虑沿程损失,并编制出相应的电算程序,对水面线推算这一重要问题加以探讨。
River gutter water line projections is the mountain flood control and road construction often encountered in a problem. Because the steep slopes have large variation in area and cross section, the influence of velocity head can not be neglected and local losses often occur. Therefore, it is often difficult to deduce the water surface of steep slopes with the method of ordinary surface water line estimation. Therefore, on the basis of analyzing the actual data of dilute debris flows and flood waterlines, this paper attempts to consider the over-resistance formula of steep slopes in mountainous area to consider the loss along the route, and to compile the corresponding calculation program. Questions to be explored.