摘要
通过对不同高度阻沙栅栏蚀积过程的野外观测,结合同时期区域风况资料,分析了阻沙栅栏前后地表蚀积形态、蚀积量以及蚀积强度的时空变化特征。结果表明,在沙源充足条件下,不同高度阻沙栅栏上风向表现为风沙堆积,下风向风蚀与堆积共存,且程度与栅栏高度有关,栅栏总体蚀积量和蚀积强度的变化趋势与下风向变化趋势相近。其中,60和70cm高度阻沙栅栏风沙堆积量最大,防沙效果最佳,但二者积沙方向存在差别。70cm高度阻沙栅栏上风向积沙较多;60cm高度阻沙栅栏下风向积沙较多。在实际应用中,应依据防护对象合理配置阻沙栅栏并适时加高,避免阻沙栅栏过低或过高,进而影响防沙效果。此外,依据断面形态、蚀积量和蚀积强度的变化,将栅栏前后分为风沙堆积区、风蚀区和蚀积平衡区。
A case study on the quantity of aeolian sand erosion and deposition of fences with different height was carried out in the observation station of Chinese Academy of Sciences at southeast of Tengger Desert.The fences with different heights were deployed in the field.Combining the observed weather data and the data of aeolian sand erosion and deposition of barrier-free flat desert over the same period,it is concluded that the sand prevention effect of the fences with the height between 50 and 90 cm is better than others.And the fences with the height between 60 and 70 cm have the best effect.However,the quantity of sand deposition is different in the up and down wind.The quantity of sand deposition is with the fences of 70 cm in the upward wind while there was more sand with the fence of 60 cm in the downward wind.In the upward wind,sand is accumulated.In the downward wind,the intensity of aeolian sand erosion and deposition change with the height of fences.In practice,we must consider the properties of protection object.Only in this way can we achieve better sand protection effect.Besides,according to the pattern of cross section,the quantity and the intense of aeolian sand erosion and deposition,the sector of the front and rear of fences was divided into sand accumulation area,wind erosion area and balance area.
出处
《水土保持通报》
CSCD
北大核心
2011年第6期37-41,共5页
Bulletin of Soil and Water Conservation
基金
国家自然科学基金项目"沙山-湖泊局地环流特征及其对风沙输移的影响"(41071009)
关键词
阻沙栅栏
蚀积过程
防沙效益
fences
process of aeolian sand erosion and deposition
sand controlling effect
