bed of sand

基本解释

Filtration material in filtration column is double layer bed composed of sand and ceramist.
过滤柱中的滤料选用石英砂和陶粒组成的双层滤料。
At upper flow regime, the total stream power gradually deviate the effective stream power from movable plane bed to existence of sand wave.
在高能态区，从动平整床面到沙浪的出现，总水流功率又逐渐背离有效水流功率。
At present the study of the movement of sands mainly focuses on theoretical analysis of and numerical simulations of blown sand on the flat bed of sand.
目前对风沙运动的研究主要集中在对平坦沙床上的风沙流进行理论与数值模拟，而对复杂地形和沙丘上的风沙运动的理论与数值模拟则相对很少。