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| Analysis of wind characteristic in spring near the highway in North China |
| Luo Han，Tian Jia，Feng Lei，Cui Qiang，Zhao Tingning，Gao Jiarong，Wang Zhiming，Gao Jun，Wu Qionj |
| Key Lab. of Soil and Water Conservation and Desertification Combating of Ministry of Education，College of Soil and Water Conservation，Beijing Forestry University，100083，Beijing，China |
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Abstract In order to offer essential basis for choice and overall arrangement of the vegetation of highway，the section of Langzhuo highway from Guan to Langfang in Hebei was chosen as study site．Since the data of wind speed and wind direction in a year were available at weather station，with the help of software such as Surfer and GIS，dynamic changes of wind speed，spatial heterogeneity and other issues involving spatial and temporal variation of wind speed were analyzed．In addition，in this region the effect of changes in wind speed on vegetation construction and surface wind erosion was explored．The results showed that monthly average wind speed changed dramatically，and March一April had the maximum and August一October had the minimum．Diurnal variation of the average wind speed appeared also a clear tendency that the maximum reached at 10：OOto12：00 and the minimum reached at 21：00 to 24：00 ．Wind speed of east，north and northeast winds are large on average．These directions were dominant wind direction，of which the speed of north wind was the largest，the followed by northeast wind Curves of monthly wind speed frequency was consistent．In March and April there were strong winds，and range of variation of wind speed was also relatively large．Therefore，in the vegetation construction of the highway，green belts mainly formed by windbreak forest belt should be built in the north and east of the road，especially green belts in the north of road was the most important，which played a great role in preventing road erosion．Additionally，good control of wind erosion in March and April when strong wind occurred frequently was significant for sand-fixing.
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Received: 01 September 2009
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