海岸横向沙脊表面风沙流结构的野外观测研究  

Field Measurements of Structure of Wind-sand flow on Coastal Transverse Ridge in China

作　　者：董玉祥[1] P A Hesp S L Namikas 马骏[1] 

机构地区：[1]中山大学地理科学与规划学院,广东广州510275 [2]Department of Geography and Anthropology,Louisiana State University,USA

出　　处：《地理科学》2008年第4期507-512,共6页Scientia Geographica Sinica

基　　金：国家自然科学基金项目(项目编号:40571019)资助

摘　　要：选择中国规模最大、形态最为典型的河北昌黎黄金海岸的横向沙脊，采用野外梯度风速仪和平口式积沙仪对其顶部的风沙流结构进行了观测。观测结果表明，海岸横向沙脊表面的风沙流结构特征基本表现为0～40cm高程内气流搬运的沙尘物质浓度或质量随高度递减并符合指数分布，20～60cm高程内符合幂函数分布，40～60cm高程内输沙量与高度之间则为多项式函数关系。同时，海岸横向沙脊表面的风沙流结构受风速与总输沙量的影响较大，随风速增大或总输沙量的增加，风沙流下层输沙量相对减少、上层则相应增加。On the typical coastal transverse ridge at Changli Gold Coast in Hebei Province, which is one of the most typical coastal Aeolian distribution regions in China and famous for the tall and typical coastal transverse ridges. Here, he structure of wind-sand flow on the top of coastal transverse ridge was measured by use of field vertical anemometer and sand trap. The field measurement results show that basic characteristic of the structure of wind-sand flow on the top of coastal transverse ridge is the sand transport rate in the wind-sand flow decreases quickly with height, which can be expressed by an exponential function at the height of 0 -40cm, but which could be expressed by the power function at the height of 20 - 60cm and polynomial function at the height 40 - 60cm. The structure of wind-sand flow on the top of coastal transverse ridge has a close relationship with the wind velocity and total sand transport rate. The ratio of sand transport rate at low layer decreases and the ratio of sand transport rate at high layer increases with the increase of wind velocity and total sand transport rate.

关 键 词：海岸横向沙脊 风沙流结构 野外观测 

分 类 号：F941.73[经济管理]