Estimation of Sand Transportation Rate for Fixed and Semi-Fixed Dunes Using Meteorological Wind Data

文献类型： 外文期刊

第一作者： Hu Xia

作者： Hu Xia;Liu Lian-You;Liu Mu-Xing;Hu Xia;Liu Lian-You;Liu Mu-Xing;Hu Xia;Li Shun-Jiang;Xiao Bi-Lin

作者机构：

关键词： vegetation degradation;wind erosion;land desertification;farming-pastoral ecotone;fixed dune;meteorological wind data;sand transportation rate;semi-fixed dune;acolian sand hazard;crucial dynamic factors;durable drought

期刊名称：PEDOSPHERE （ 影响因子：3.911； 五年影响因子：4.814 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Taibus County, Inner Mongolia, China, lies in a farming-pastoral ecotone, where severe wind erosion and various acolian sand hazards are prevalent and fixed and semi-fixed sand dunes occur frequently. This study was conducted to investigate the relationships between sand transportation rate and wind speed for the fixed and semi-fixed sand dunes based on field measurements. The annual quantity of soil erosion by wind was estimated using meteorological wind data. The results indicated that the sand transportation rate in Taibus County in 2000 was 57.38 kg cm(-1) year(-1) for the semi-fixed dunes and 4.56 kg cm(-1) year(-1) for the fixed dunes. The total duration of erosive winds covered 12.5% of the time of the year, and spring posed the highest potential of sand transportation. Wind with low speed (<= 17 m s(-1)) and high frequency plays a dominant role in sand transportation, while strong wind (>= 17 m s(-1)) with low frequency significantly enhanced the sand transportation. Erosive wind speed, directions, and frequency were three crucial dynamic factors influencing sand hazards in the farming-pastoral ecotone. The dominant factors intensifying sand and dust storms in Taibus County might be related to the favorable wind condition in combination with the durable drought, which led to land desertification and vegetation degradation.

分类号： S15

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