莫高窟顶输沙势研究

Study of Drift Potential Atop of Mogao Grottoes

本文以1992-1994、1998-2001年莫高窟顶自动气象观测站2m高度,时距15min记录的风资料为基础,通过对风况的统计分析和输沙势的计算,从风沙环境特征阐明该区主要受西北、东北和偏南风三组风向共同作用。三组风况出现频率和输沙势明显不同。该区风向变率指数较小,风况复杂,属于中风能环境。通过对风况的分析及输沙势的理论计算,以期对莫高窟的风沙危害防治提供科学理论依据。

Through statistics of wind regime and calculation of drift potential on the basis of wind data of the automatic meteorological station on the top of the Mogao Grottoes from 1992 to 1994 and from 1998 to 2001, the article illustrated that this region was affected by northwest, northeast and south winds, and the annual frequencies of the wind regime and their sand drift potential are obviously different. The variability index of wind in this region is quite low indicating complicated wind regime. According to Fryberger＇s （1979） classification of wind energy environment, this region belongs to moderate wind energy environment. Through theoretically analyzing the wind regime and calculating the drift potential, the results of the research can be used as guidelines for improving the integral approach in controlling the blown sand at the Mogao Grottoes.