The Spatial Variation of Aerodynamic Parameters and Wind Erosion Potential in Southwestern Tarim Basin from Shifting Desert to Oasis

2018 4th International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Zhou, Jie^1^2 ; Li, Shengyu^1^2 ; Gao, Xin^1^2 ; Wang, Haifeng^1^2

Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, XINJIANG

830011, China^1

Mosuowan Desert Research Station, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Shihezi

832000, China^2

关键词: Aerodynamic parameters;    Aerodynamic roughness;    Friction velocity;    Land-cover types;    Southwestern tarim basins;    Spatial variations;    Vegetation condition;    Wind velocities;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/252/5/052145/pdf
DOI  :  10.1088/1755-1315/252/5/052145

来源: IOP

【 摘 要 】

The southwestern Tarim Basin of China is a primary wind erosion damage and environmental degradation region characterized by shifting sand dunes, semi-shifting sand dunes, fixed sand dunes and oasis farmlands. To determine their relative susceptibility to wind erosion under different land cover types, wind velocity profiles were measured and used to determine friction velocity (u∗) and aerodynamic roughness (z0) of the four land cover types throughout the wind erosion season of 2010-2012. The erodible particles contents of surface soil mass were analyzed. The u∗ averaged 0.33 ms-1, 0.44 ms-1, 0.61 ms-1 and 0.81 ms-1, while z0 averaged 0.39 mm, 13.58 mm, 39.51 mm and 310.8 mm for the shifting sand dunes, semi-shifting sand dunes, fixed sand dunes and oasis farmlands, respectively. The results showed that u∗ and z0 were both correlated with surface roughness properties of the underlying vegetation condition and z0 decreases with increasing wind speed due to the near surface plant roughness properties and wind flow. The erodible particles content were 56.92%, 60.17%, 65.80% and 74.56% for the shifting sand dunes, semi-shifting sand dunes, fixed sand dunes and oasis farmlands, respectively. These results indicate that though the oasis farmlands have the largest erodible particles content but with the greatest u∗ and z0, the dynamic wind conditions were not usually able to achieve by causing the dust emission. In contrast, the shifting sand dunes have the greatest potential for wind erosion due to lowest u∗ and z0.