Analysis of Wind Erosion Caused Landscape Change and Its Relation with Spatial Distribution of Wind Energy
Received date: 2001-06-04
Revised date: 2001-09-26
Online published: 2002-01-25
Supported by
Knowlege Innovetion Project of CAS, No. KZCX1-Y-02
Based on the results of the remote sensing investigations of the land-use and land-cover of 1995 and 2000, the national distribution of sandy desertified land and its interaction with other landscapes are classified, and five zonal types are distinguished. In arid and semi-arid areas of China, the intensity of wind field is one of the key factors that control the development of landscape especially in desert and its adjacent area. To better understand the spatial distribution of wind erosion landscapes as well as their dynamic changes, essential work is needed to expose the spatialy distribution of wind field and its changes. In the paper, the data of nationally distributed 400 meteorological stations of 1999 are processed. With the GIS method, the data are spatially interpolated, and the national database of wind field concerned with wind erosion is established. Wind speed and its duration are one of the most important factors that control wind erosion of soil. When the friction speed is satisfied, wind erosion occurs. Different indexes are set up to describe the intensity of wind field, such as the number of days that their daily average wind speed exceeds the value of threshold speed and the number of records that their speed surpass the threshold speed. The method suggested by the wind erosion prediction models of RWEQ is also adopted to express the intensity of wind. The results are compared, and the distribution of wind field in China is discussed. The relation of the distribution of landscape and wind field is then discussed indicating the strong wind field in Northwest China as a most important factor that causes serious landscape change especially to the diminishing of the grassland and contrarily the expansion of the sandy desertified land.
Key words： wind erosion of soil; wind energy; weibull distribution; GIS/RS; China
ZHANG Guo-ping, LIU Ji-yuan, ZHANG Zeng-xiang, ZHAO Xiao-li, ZHOU Quan-bin . Analysis of Wind Erosion Caused Landscape Change and Its Relation with Spatial Distribution of Wind Energy[J]. Acta Geographica Sinica, 2002 , 57(1) : 1 -10 . DOI: 10.11821/xb200201001
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