莫高窟窟顶风况及输沙势研究

摘要/Abstract

摘要： 以1998—2001年莫高窟窟顶自动气象观测站记录的风资料为基础，通过对风况的统计和输沙势的计算，从风沙环境特征阐明了研究区主要受西北、东北和偏南三组风向共同作用。三组风况出现频率明显不同，其输沙势有一定差异。研究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。最后通过对莫高窟2001年输沙势（量）的对比计算，指出了现有输沙势公式存在的局限与不足。

关键词: 莫高窟, 风况, 输沙势, 输沙玫瑰图

Abstract: We studied the wind regime and calculated the sand-drift potential atop the Mogao Grottoes based on wind data recorded by the automatic meteorological station from 1998 to 2001. Statistical result showed that this region was affected predominantly by NW, NE and lean to S wind directions. Their occurrence frequencies were obviously different, so did their sand drift potential to some extent. The variability index of wind direction in this region was quite low, which indicated that this region had complicated wind regime, and belonged to the moderate wind-energy environment according to Frybergers (1979) classification. The study aimed to provide scientifically theoretical bases for preventing and controlling wind-sand disasters to the Mogao Grottoes through analyzing the wind regime and calculating the sand drift potential. Comparing the results calculated by the Fryberger Method and the modified formula by Ling Yuquan, we found out that the existing formulae used for calculating sand drift potential have limitation in practical application. So, further modification suitable for local condition is urgently needed.

Key words: Mogao Grottoes, wind regime, drift potential, drift potential rose

中图分类号:

P425.3

黄翠华;张伟民;李爱敏. 莫高窟窟顶风况及输沙势研究[J]. 中国沙漠, 2006, 26(3): 394-398.

HUANG Cui-hua;ZHANG Wei-min;LI Ai-min. Study on Wind Regime and Drift Potential atop Mogao Grottoes[J]. JOURNAL OF DESERT RESEARCH, 2006, 26(3): 394-398.

参考文献

[1]张华,李锋瑞,李玉霖,等. 科尔沁沙地奈曼旗近5年来风况及合成输沙势[J]. 中国沙漠,2004,24(5):623－627.
[2]赵兴梁译.世界沙海的研究[M].银川:宁夏人民出版社,1993.126－134.
[3]Bagnold R A. The Physical of Blown Sand and Desert Dunes [M].London: Methuen,1941.256.
[4]Bullard J E. A note on the use of the Fryberger method for evaluating potential sand transport by wind [J].Journal of Sedimentology Research,1997, 67:499－501.
[5]Sarre R D. Evaluation of aeolian sand transport equations using intertidal zone measurements [J]. Saunton Sands England Sedimentology,1988,35:671－579.
[6]Belly P Y. Sand movement by wind [C]. United States Army Corps of Engineers, Coastal Engineering Research Center,Technical Memo,1964,1: 80.
[7]Pearce K I, Walker I J. Frequency and magnitude biases in the \!Fryberger\" model, with implications for characterizing geomorphically effective winds [J].Geomorphology, 2005,68: 39－55.
[8]凌裕泉.最大可能输沙量的工程计算[J].中国沙漠,1997,17(4): 362－368.
[9]张伟民,王涛,薛娴,等.敦煌莫高窟风沙危害综合防护体系探讨[J].中国沙漠,2000,20(4):409－414.
[10]朱震达,吴正,刘恕,等.中国沙漠概论（修订本）[M].北京:科学出版社,1980.53－54.
[11]屈建军,苗天宝,张伟民,等．敦煌莫高窟窟顶沙丘移动的初步研究[J].甘肃地质学报,1995,4(2): 87－93.
[12]Wang Tao, Zhang Weimin, Dong Zhibao, et al. The dynamic characteristics and migration of a pyramid dune [J]. Sedimentology,2005,52: 429－440.
[13]屈建军,张伟民,王远萍,等.敦煌莫高窟岩体风蚀机理及其防护对策的研究[J].中国沙漠,1994,14(2): 18－23.
[14]屈建军,张伟民,彭期龙,等.论敦煌莫高窟的若干风沙问题[J].地理学报,1999,51(6):418－425.
[15]Fryberger S G. Dune forms and wind regime[A]. In: McKee E D, (Ed.). A Study of Global Sand Seas [C]. US Geological Survey and United States National Aeronautics and Space Administration, Washington D C.USGS Professional Paper,1979,1052:137-169.
[16]凌裕泉,屈建军,樊锦诗,等.莫高窟崖顶防沙工程的效益分析[J].中国沙漠,1996,16(1):18－23.
[17]Zhang Weimin, Wang Tao, Wang Wanfu, et al. The gobi sand stream and its control over the top surface of the Mogao Grottoes, China[J]. Bull. Eng. Geol. Env.,2004, 63: 261-269.