干旱区生态环境知识资源中心(Arid): Wind erosion rate for vegetated soil cover: A prediction model based on surface shear strength

Arid

DOI	10.1016/j.catena.2019.104398
	Wind erosion rate for vegetated soil cover: A prediction model based on surface shear strength
	Cheng Hong 1,2,3; Liu Chenchen 3; Zou Xueyong 1,2,3; Li Huiru 3; Kang Liqiang 1,2,3; Liu Bo 4; Li Jifeng 5
通讯作者	Cheng Hong
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2020
卷号	187
英文摘要	Vegetation is regarded as the most effective measure for soil erosion control and sand control projects, which plays an important role in controlling soil wind erosion and sand disasters in arid and semiarid regions. Most of the existing models for soil wind erosion rate prediction are based on empirical results that consider factors such as vegetation coverage and wind speed but have rarely investigated the wind erosion rate from the shear strength perspective, which is also an important reason why it is difficult for existing wind erosion models to be popularized. In fact, the presence of vegetation alters the distribution of the near-surface airflow field and thus profoundly changes the magnitude and spatial distribution of shear stress generated by airflow on soil particles. According to existing theories, it is very difficult to describe these processes. Although the shear stress on a vegetation-covered soil surface may be measured using existing observation techniques, difficulties in technology make it impractical for conducting at a large scale. Consequently, research that combines soil wind erosion and the shear strength of vegetation-covered soil surfaces has rarely been reported. Therefore, the prediction of discrete wind erosion rates considering the uneven spatial distribution of the airflow field has gradually become a new trend in the study of the wind erosion of vegetation-covered soil surfaces. In this study, the model for the airflow field of a single plant and the conversion model for the airflow field from a single plant to multiple plants were examined, based on which parameters, such as vegetation characteristics and plant density in wind tunnel tests, were combined to simulate the spatial distribution of the airflow field over vegetation cover surface under four different vegetation coverages. A method for calculating the effective shear strength of the vegetation-covered soil surface was proposed, and the effective shear strength of the surface with different vegetation covers was determined. The effective shear strength of the vegetation-covered soil surface was found to increase with increasing wind speed, decrease with increasing vegetation coverage, and decrease with increasing particle size. On this basis, the relationship between the wind erosion rate q and the effective shear strength tau(eff) of the vegetation-covered soil surface was quantitatively established as q = k root d/g.tau(eff), where k = 114.02. Findings of this study help to explain the wind erosion dynamics of a vegetation-covered soil surface and can also provide a solid foundation for constructing a wind erosion prediction model based on the theory of dynamics.
英文关键词	Soil wind erosion rate Surface shear strength Vegetation coverage Wind tunnel
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000514020400016
WOS关键词	SEDIMENT TRANSPORT ; SAND TRANSPORT ; AIR-FLOW ; ROUGHNESS LENGTH ; DRAG PARTITION ; SINGLE ; RECOVERY ; FIELD ; LEE ; DISPLACEMENT
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314230
作者单位	1.Beijing Normal Univ, State Key Lab Surface Proc & Resource Ecol, Xinjiekouwai St 19, Beijing 100875, Peoples R China; 2.Minist Desertificat Prevent & Control, Engn Res Ctr, Beijing 100875, Peoples R China; 3.Beijing Normal Univ, Dept Geog Sci, Beijing 100875, Peoples R China; 4.Chinese Res Inst Environm Sci, Beijing 100021, Peoples R China; 5.Hebei Normal Univ, Coll Resources & Environm Sci, Shijiazhuang 050016, Hebei, Peoples R China
推荐引用方式 GB/T 7714	Cheng Hong,Liu Chenchen,Zou Xueyong,et al. Wind erosion rate for vegetated soil cover: A prediction model based on surface shear strength[J]. 北京师范大学,2020,187.
APA	Cheng Hong.,Liu Chenchen.,Zou Xueyong.,Li Huiru.,Kang Liqiang.,...&Li Jifeng.(2020).Wind erosion rate for vegetated soil cover: A prediction model based on surface shear strength.CATENA,187.
MLA	Cheng Hong,et al."Wind erosion rate for vegetated soil cover: A prediction model based on surface shear strength".CATENA 187(2020).