摘要
土壤表面粗糙度是影响耕作土壤抗风蚀能力的一个重要因素。根据风速廓线计算得到的空气动力学粗糙度 ,可以简捷而有效地刻画土壤表面的空气动力学性质。风洞模拟实验表明 ,耕作土壤表面的空气动力学粗糙度主要取决于暴露地表的土块直径 ,在土块大致均匀分布的条件下 ,直径愈大 ,空气动力学粗糙度愈大。土壤风蚀速率则随空气动力学粗糙度的增大而迅速减小 。
Surface roughness is an important feature that affects wind erosion. Aerodynamic roughness calculated by wind profile can be employed to depict aerodynamic properties of cultivated soil effectively. Wind tunnel tests show that aerodynamic roughness length is mainly determined by the diameter of the largest soil clods exposed and uniformly distributed on the soil surface. Wind erosion rates decrease with aerodynamic roughness length. There are good relationships between soil wind erosion rates and aerodynamic roughness length.
出处
《中国沙漠》
CSCD
北大核心
2002年第5期473-475,共3页
Journal of Desert Research
基金
中国科学院寒区旱区环境与工程研究所知识创新项目 (CACX2 10 0 2 6)
国家自然科学基金项目 (4 0 170 11)资助
关键词
空气动力学粗糙度
耕作土壤
土壤风蚀
风洞实验
Aerodynamic roughness
cultivated soil
soil wind erosion
wind tunnel test
