老哈河下游地区春季风沙活动强度特征

The intensity of sand drift activities in spring in the downstream of the Laoha River,China

风沙活动强度是研究风沙地貌形成、演变及进行风沙灾害防治的重要理论依据。通过2006-2013年风速数据的统计和计算,对老哈河下游地区春季风沙活动强度特征进行了系统研究。结果表明:有效起沙风速随着风速等级的增加,其出现频率相应减少,主要集中在5.1~9.0m·s^(-1)之间;输沙势、输沙量的方位分布与起沙风相似,以WNW、NW方向为主;春季的输沙势(DP)为70.50 VU,合成输沙势(RDP)为37.89VU,合成输沙方向(RDD)为108.3°;春季的最大可能输沙量为1848.49kg·m^(-1),合成输沙量为1005.42kg·m^(-1),合成输沙方向为103°,与该地区沙丘走向基本吻合;对输沙量贡献最大的风速以6.0~10.0m·s^(-1)为主。

The intensity of sand drift activities is the important theoretic base both for studying the formation and evolution of Aeolian geomorphology and carrying out the sand damage control measures. By statistic and calculation of the wind data from 2006 to 2013,we studied the intensities of sand drift in the spring in the downstream of the Laoha River. The results are follows ： with the increase of wind velocity,its frequency decreased gradually,and the most were from 5. 1m·s-1- 9. 0m·s-1. Similar to the distribution of sand-driving wind velocity,the distribution of potential and transporting quantity was mainly in WNW and NW directions. In spring drift potential was 70. 50 VU,the resultant drift potential was 37. 89 VU,the resultant drift potential direction was 108.3°. In spring the maximum possible sand transporting quantity was 1848. 49kg·m-1,the resultant transporting quantity was 1005. 42kg·m-1,and the resultant transporting direction was 103°. The most contributors to sand flux concentrated between 6. 0- 10. 0m·s-1.