甘肃瓜州锁阳城南雅丹地貌区起沙风况与输沙势特征

doi:10.7522/j.issn.1000-694X.2018.00079

摘要/Abstract

摘要： 以2016—2018年定位气象观测数据为依据，分析了甘肃瓜州锁阳城南雅丹地貌区的起沙风况及输沙势变化情况。结果表明：（1）研究区起沙风由两组风向近似相反的风所组成，主风向为NE-E，占全年起沙风的68.86%，次风向为WSW-WNW向，占27.67%；（2）年平均起沙风频率为19.0%，春季和夏季起沙风频率最高，分别占全年的33.57%和34.69%，各季起沙风向分布特征基本一致；（3）研究区风况类型为高风能环境和中等风向变率的钝双峰型风况。输沙势的大小和方向变率具有明显的季节性，春、夏季的总输沙势（DP）和合成输沙势（RDP）较高，夏季和冬季的方向变率RDP/DP值较高，合成输沙方向（RDD）245.45°~253.01°（WSW）；（4）研究区雅丹地貌长轴走向与主输沙方向一致，说明风力是其形成的主要动力条件。

关键词: 锁阳城, 雅丹地貌, 起沙风, 风况, 输沙势

Abstract: Based on the meteorological observation data from 2016 to 2017 and the geomorphic feature of the research area, we analyzed the sand-driving wind regime and sand drift potential in the yardang landform areas in the south of Suoyang. The results indicated that: Sand-driving wind in the research area was composed of two groups of wind that close to the opposite directions. There was a higher accumulated frequency with 68.86% in the NE-E direction, and 27.67% in the WSW-WNW. The frequency of annual sand-driving wind was 19.0%, and the sand-driving wind occurred mainly in the spring and summer, with an occurring frequency of 33.57% and 34.69%, respectively. The direction structure of seasonal sand-driving wind was similar. Fry berger equation was applied to calculate annual and seasonal sand drift potential, and to analyze its seasonal variation. As a whole, the wind regime in the study area was high wind environment, medium variability and blunt bimodal wind condition. Obvious seasonal differences were reflected in the sand drift potential and directional variability, and there was higher resultant sand drift potential (RDP) and drift potential (DP) in spring and summer and higher RDP/DP in summer and winter. The resultant drift direction (RDD) was in the range of 245.45°-253.01° (WSW), which was consistent with the directions of yardang main ridge line. Therefore, aeolian power was the main driving force for the formation of yardang landform. In addition, this paper provided a theoretical reference for elucidating the formation and development process of yardang landform by combining with the features of field landform.

Key words: Suoyang county, the yardang landform, sand-driving wind, wind regime, sand drift potential

中图分类号:

P931.3

梁晓磊, 牛清河, 安志山, 屈建军, 邵亚平, 王亮. 甘肃瓜州锁阳城南雅丹地貌区起沙风况与输沙势特征[J]. 中国沙漠, 2019, 39(3): 48-55.

Liang Xiaolei, Niu Qinghe, An Zhishan, Qu Jianjun, Shao Yaping, Wang Liang. Sand-driving Wind Regime and Sand Drift Potential in the Yardang Landform Areas of Southern Suoyang Town,Guazhou,Gansu,China[J]. Journal of Desert Research, 2019, 39(3): 48-55.

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