莫高窟崖顶防沙工程的效益分析

４年防沙实践证明：莫高窟崖顶防沙试验的工程设计构思是正确的，设计依据科学可靠，防护效益显著。对保护石窟和壁画已经起到重要的作用．其具体防护作用是：１）直接控制偏西风向洞窟搬运沙量的９５％左右；２）洞前夜间积沙减少了８０％以上；３）外围栅栏对来自主风向的外侧积沙的侧导率平均为３５％；对内侧积沙的侧导率，在偏东风作用下可达５７．５１％，在偏西风作用下平均为１５．８９％．上述防沙作用均具有明显的季节变化。

THE EFFECT ANALYSIS OF SAND CONTROL ENGINEERING ON THE CLIFF TOP OF MOGAO GROTTOES

Sand control practices of four years prove that the sand control engineering on the cliff top of Mogao Grottoes is designed based on a correct design and reliable scientific evidence. It has obvious effects to sand control, there are 1 ) 95 % of sand-transporting quantities from the west of the grottoes are directly controlled ; 2) 80% of accumulated sands in front of the grottoes at night are reduced;3) the average side-diverting-sand capacity outside the fence is 35% to the accumulated sands from main wind direction; inside the fence the figure is 57. 51 % to the eastly wind, and 15. 89% to the westly. The protective effects change with different seasons.