摘要
利用塔克拉玛干沙漠腹地塔中地区的观测资料,对塔中地区春夏季地表土壤风蚀起沙的临界摩擦速度及其变化特征和起沙风速进行了分析研究,并计算了2008年4月19日和7月19日两次沙尘暴天气过程沙漠地表的风蚀起沙量。结果表明:塔中地区春夏季地表起沙的临界摩擦速度为0.26m·s-1;2m高度的临界起沙风速约为4.1m·s-1;两次沙尘暴过程的顺风向沙粒通量和垂直尘粒通量的平均值分别为17.44×10-4kg·m-1·s-1、13.8×10-8kg·m-2·s-1、164.69×10-4kg·m-1·s-1和799.77×10-8kg·m-2·s-1;沙尘通量的变化与风速及摩擦速度的变化具有一致性。
Based on the field observation and meteorological data at Tazhong of Taklimakan Desert, the critical friction velocity of dust emission by wind erosion and the threshold sand-moving wind velocity in Spring and Summer are analyzed in the paper. The dust emissions by wind erosion at Tazhong during the two sandstorm events on April 19 and July 19, 2008 are calculated. The results indicate that the critical friction velocity is about 0.26 m·s^-1 and the near-surface threshold sand-moving wind velocity is about 4.1 m·s^-1. The average values of down-wind sand flux during the two sandstorm events on April 19 and July 19, 2008 are 17.44×10^-4·kg·m^-1·s^-1, 13.8 ×10^-8·kg·m^-2·s^-1 respectively, and the vertical dust flux during these two sandstorm events are 164.69×10^-4·kg·m^-1·s^-1 and 799.77 ×10^-8·kg·m^-2·s^-1 respectively. The variation of dust flux is consistent with the variations of the wind velocity and the friction velocity.
出处
《中国沙漠》
CSCD
北大核心
2010年第4期770-776,共7页
Journal of Desert Research
基金
新疆维吾尔自治区科技攻关项目(200833119)
国家自然科学基金项目(40775019)
中国气象局新技术推广项目(CMATG2007M27
CMATG2010M29)
中央级公益性科研院所基本科研业务费专项资金项目(IDM2006002
IDM200807)共同资助
关键词
风蚀起沙
临界摩擦速度
起沙风速
沙尘通量
塔克拉玛干沙漠
dust emission by wind erosion
critical friction velocity
threshold sand-moving wind velocity
dust flux
Taklimakan Desert
