FRYBERGER输沙势计算方法及其估算值偏差分析——以塔克拉玛干沙漠为例  

Magnitude deviations of sand drift potential calculation in the‘FRYBERGER'model:a case of the Taklimakan Desert

作　　者：房彦杰 赵景峰[1] 郭永平[2] 李生宇[2] 何清[3] 韩鑫[1] 

机构地区：[1]四川师范大学地理与资源科学学院,四川成都610101 [2]中国科学院新疆生态与地理研究所,新疆乌鲁木齐830011 [3]中国气象局乌鲁木齐沙漠气象研究所,新疆乌鲁木齐830002

出　　处：《干旱区地理》2015年第1期95-102,共8页Arid Land Geography

基　　金：中国沙漠气象科学研究开放基金项目(Sqj2007003)

摘　　要：以塔克拉玛干沙漠地区2007年5个观测站及策勒站2007-2013年逐时观测数据为例,详细介绍了FRYBERGER输沙势计算方法和步骤,并对输沙势含义和易混淆的问题进行了解释说明。基于输沙势公式定义输沙势基准值,通过比较FRYBERGER输沙势估算值与基准值之间的差异,分析了不同观测点之间年均输沙势及其各风级输沙势分量的估算偏差。结果表明:(1)风速观测值的平均时距愈短,风速脉动性作用愈显著,导致输沙势计算值偏大。(2)输沙势的贡献率主要集中于I、II风级,其分布形态不同于起沙风频数分布。(3)FRYBERGER方法估算各测站年均输沙势时,采用FRYBERGER风速中间值产生的估算偏差最小。(4)输沙势估算偏差具有区域和年际性变化(策勒站为例)。(5)各风级风速代表值对输沙势分量的估算偏差产生影响,其最佳组合随观测点和年份而变化;采用最佳组合可有效减小输沙势估算偏差。Sand drift potential is a useful index for assessing the wind-energy of blown sand,which plays an important role in the formation of aeolian landforms. The FRYBERGER method provides a simple and practical model to evaluate the value of drift potential（DP）from measurements of wind velocity. That is,without the actual measurements or even the wind records in different types,using the statistical wind data,such as the representative velocity value corresponding to each wind class and the time wind blew expressed as percentage,also can calculate the DP values. Another is that the model offers a standard for assessing the wind-energy of blown sand,which is widely used in various regions. Unfortunately,there is still some doubt about the process of DP calculation,and it would influence the accuracy of DP. Thus,on the basis of the varied wind data recorded hourly from five sites in Taklimakan Desert in 2007 and Cele site at Qira County,Xinjiang,China in 2007-2013,the clarification of some confusion about DP is given with the example calculations of using FRYBERGER method. Whereas the accuracy of the DP values and its differences between wind velocity-type calculated in FRYBERGER model are required for each site.Then,the most precise values of DP calculated from the definition-based method are expressed as the reference values（DP＊）,the annual DPs at the five sites and their components corresponding to each wind class are estimated to compare the different deviations of DP from the DP＊ distinguished by local sites and wind velocity classes. The results show as follows：（1）For the types of wind velocity recorded as different time-averaged mean values,it appears that the shorter of the time-interval is,the higher of the wind mean velocity becomes. Because the impact of wind impulse on sand drift has been improved,by which the evaluated DPs are enlarged relatively. Such as in Cele site,compare the DP＊ calculation of two minutes-averaged mean values to ten minutes,the former has increased by 4.7%.（2）The

关 键 词：输沙势计算 FRYBERGER方法 输沙势偏差 塔克拉玛干沙漠 

分 类 号：P931.3[天文地球—自然地理学]