摘要
分析植被覆盖和人工扰动下戈壁地表的风沙流结构和摩阻风速与输沙率之间的关系,对保护戈壁区的生态环境具有重要意义。本文分别对植被覆盖下的戈壁地表和人工清除植被后的戈壁地表进行研究。结果显示:在不同的地表条件下,风沙流结构的变化趋势基本相同,大致可以分为3类:波动减少、先增加后减少和单调减少。受扰地表的输沙率密度大于原始地表。将摩阻风速以0.50 m·s^-1为界分为高、低风速。在植被覆盖的地表中,高、低风速区的输沙率与摩阻风速之间没有明显的线性相关性;而在人工清除植被后的地表,高风速区内,输沙率与摩阻风速之间满足传统的低阶多项式的关系,低风速区内两者之间则没有线性关系。
The aeolian sand structure and the relationship between wind speed and sediment transport rate over the surfaces of the Gobi desert with vegetation cover and affected by artificial disturbance are analyzed in the present study, which is of great significance for the protection of the ecological environment of the Gobi. The Gobi surface under vegetation cover and the surface after artificial plant removal were investigated. The results show that the pattern of variation in the aeolian sand structure under different surface conditions was basically the same, and can be roughly divided into three categories: fluctuating decrease, decrease before increase, and continuous decrease. The sediment transport density of the disturbed surface was higher than that of the original surface. The friction wind speed was divided into high and low wind speed with a boundary of 0.50 m·s^-1. There was no significant correlation between the sand transport rate and friction wind speed in high and low wind speed zones on vegetation-covered land. However, after artificial vegetation removal, the relationship between high wind speed zones, sediment transport rate, and friction wind speed conforms to the traditional low-order polynomial, while there was no such correlation in the low-wind speed area.
作者
刘旭阳
宁文晓
王振亭
LIU Xu-yang;NING Wen-xiao;WANG Zhen-ting(Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《干旱区研究》
CSCD
北大核心
2020年第4期1087-1094,共8页
Arid Zone Research
基金
国家自然科学基金项目(41630747,41971011)。
关键词
戈壁地表
风沙流结构
输沙率
摩阻风速
Gobi
aeolian sand structure
sand flux transport rate
friction wind speed
