在木材流送河川上,解决木材过坝是一个极为重要的问题。过去我们一般采用斜坡式滑道,这种滑道在坝较高的情况下,为了达到要求的放排速度,就要适当的把滑道加长减缓其坡度,或者采取人工加糙措施,这样必然引起工程量的增加和施工的麻烦。同时对放排滑道的加糙要求与一般水工建筑物的要求不同,它除了解决滑道消能降速外,还要求水流的流态和水深应满足放排的要求。现有一般水力学和水工建筑物所论述的加糙形式,是不能满足放排要求的。目前省内外关于滑道加糙方面的资料很少,实践经验也不多,有些省内外的经验,实践据明是不成功的, In the wood flow to the river, to solve the problem of timber over the dam is a very important issue. In the past we generally use the ramp slide, the slide in the dam is higher, in order to achieve the required discharge rate, it is appropriate to reduce the ramp to slow down its slope, or to manually add rough measures, so inevitable Causing an increase in the amount of construction and construction problems. At the same time, the roughness requirements of the discharge chute are different from the requirements of the general hydraulic structures. In addition to reducing the speed of chute energy dissipation, it also requires that the flow and water depth of the water flow meet the requirements of discharge. Conventional hydraulics and hydraulic structures discussed in the rough form, can not meet the discharge requirements. At present, there are only a few information on roughing in or out of the province both inside and outside the province and few practical experiences. Some experience and practice inside and outside the province are obviously unsuccessful,