A contrasting seasonality of wind erosivity and wind erosion between Central and Western Sahel

IF 3.1 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Aeolian Research Pub Date : 2023-06-01 DOI:10.1016/j.aeolia.2023.100879

C. Pierre , J.L. Rajot , I. Faye , G.S. Dorego , C. Bouet , B. Marticorena , G. Bergametti , A. Ka , B. Amar , A. Tall , N. Diagne , A. Feron

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引用次数: 1

Abstract

Wind erosion is a major phenomenon in the Sahel, and can affect soil fertility. Studies of Sahelian aeolian erosion or erosivity are scarce and have been mainly focused on the Central Sahel. Since February 2020, the number of saltating particles and the horizontal flux of aeolian sediment were monitored in Bambey (Senegal) in combination with long-term 5-minutes wind measurements (2014–2021). These datasets enabled to assess the consistency of wind erosion and wind erosivity estimates, and thus to further analyze wind erosivity over pluriannual periods, as wind speed time-series are available over longer terms than horizontal aeolian flux. As a result, the seasonality of wind erosivity largely differs between Western and Central Sahel. In Western Sahel, wind erosivity is related to medium wind speeds during the dry season, while in Central Sahel it is mostly due to high wind speeds occurring at the monsoon onset. Additionally, horizontal flux of aeolian sediments during the dry season are of the same order in Senegal as in Western Niger, but lower than in Eastern Niger. Horizontal flux of aeolian sediments during the rainy season are lower in Senegal than in Western Niger and Eastern Niger. Altogether, annual aeolian flux thus appears significantly lower in Western than in Central Sahel, and mostly related to the dry season.

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萨赫勒中部和西部风蚀和风蚀的季节性对比

风蚀是萨赫勒地区的一个主要现象，会影响土壤肥力。对萨赫勒地区风蚀或侵蚀力的研究很少，而且主要集中在萨赫勒中部。自2020年2月起，结合2014-2021年长期5分钟风速测量，对塞内加尔班贝地区的跳跃粒子数量和风沙水平通量进行了监测。这些数据集能够评估风蚀和风蚀力估计的一致性，从而进一步分析多年期的风蚀力，因为风速时间序列比水平风成通量更长期。因此，萨赫勒西部和中部地区的风蚀性季节性差异很大。在萨赫勒西部，风蚀性与旱季的中等风速有关，而在萨赫勒中部，主要是由于季风开始时出现的高风速。此外，塞内加尔旱季风成沉积物的水平通量与尼日尔西部相同，但低于尼日尔东部。塞内加尔雨季风成沉积物水平通量低于尼日尔西部和尼日尔东部。总的来说，萨赫勒西部的年风沙通量明显低于中部，而且主要与旱季有关。

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来源期刊

Aeolian Research GEOGRAPHY, PHYSICAL-

CiteScore

7.10

自引率

6.10%

发文量

审稿时长

>12 weeks

期刊介绍： The scope of Aeolian Research includes the following topics: • Fundamental Aeolian processes, including sand and dust entrainment, transport and deposition of sediment • Modeling and field studies of Aeolian processes • Instrumentation/measurement in the field and lab • Practical applications including environmental impacts and erosion control • Aeolian landforms, geomorphology and paleoenvironments • Dust-atmosphere/cloud interactions.