干旱区生态环境知识资源中心(Arid): Physically based model for gully simulation: application to the Brazilian semiarid region

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DOI	10.5194/hess-24-4239-2020
	Physically based model for gully simulation: application to the Brazilian semiarid region
	Lima Alencar, Pedro Henrique; de Araujo, Jose Carlos; Teixeira, Adunias dos Santos
通讯作者	Alencar, PHL
来源期刊	HYDROLOGY AND EARTH SYSTEM SCIENCES
ISSN	1027-5606
EISSN	1607-7938
出版年	2020
卷号	24 期号:8 页码:4239-4255
英文摘要	Gullies lead to land degradation and desertification as well as increasing environmental and societal threats, especially in arid and semiarid regions. Despite this fact, there is a lack of related research initiatives. In an effort to better understand soil loss in these systems, we studied small permanent gullies, which are a recurrent problem in the Brazilian northeastern semiarid region. The increase in sediment connectivity and the reduction of soil moisture, among other deleterious consequences, endanger this desertification-prone region and reduce its capacity to support life and economic activities. Thus, we propose a model to simulate gully-erosion dynamics, which is derived from the existing physically based models of Foster and Lane (1983) and Sidorchuk (1999). The models were adapted so as to simulate long-term erosion. A threshold area shows the scale dependency of gully-erosion internal processes (bed scouring and wall erosion). To validate the model, we used three gullies that were over 6 decades old in an agricultural basin in the Brazilian state of Ceara. The geometry of the channels was assessed using an unmanned aerial vehicle and the structure from motion technique. Laboratory analyses were performed to obtain soil properties. Local and regional rainfall data were gauged to obtain sub-daily rainfall intensities. The threshold value (cross-section area of 2 m(2)) characterizes when erosion in the walls, due to loss of stability, becomes more significant than sediment detachment in the wet perimeter. The 30 min intensity can be used when no complete hydrographs from rainfall are available. Our model could satisfactorily simulate the gully-channel cross-section area growth over time, yielding a Nash-Sutcliffe efficiency of 0.85 and an R-2 value of 0.94.
类型	Article
语种	英语
开放获取类型	Green Submitted, Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000566728100002
WOS关键词	THRESHOLD CONDITIONS ; DEBRIS FLOWS ; SOIL LOSS ; LAND-USE ; EROSION ; WATER ; RAINFALL ; IMPACTS ; QUANTIFICATION ; DEGRADATION
WOS类目	Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326091
作者单位	[Lima Alencar, Pedro Henrique] TU Berlin, Inst Okol, D-10587 Berlin, Germany; [Lima Alencar, Pedro Henrique; de Araujo, Jose Carlos; Teixeira, Adunias dos Santos] Univ Fed Ceara, Dept Engn Agr, Fortaleza, Ceara, Brazil
推荐引用方式 GB/T 7714	Lima Alencar, Pedro Henrique,de Araujo, Jose Carlos,Teixeira, Adunias dos Santos. Physically based model for gully simulation: application to the Brazilian semiarid region[J],2020,24(8):4239-4255.
APA	Lima Alencar, Pedro Henrique,de Araujo, Jose Carlos,&Teixeira, Adunias dos Santos.(2020).Physically based model for gully simulation: application to the Brazilian semiarid region.HYDROLOGY AND EARTH SYSTEM SCIENCES,24(8),4239-4255.
MLA	Lima Alencar, Pedro Henrique,et al."Physically based model for gully simulation: application to the Brazilian semiarid region".HYDROLOGY AND EARTH SYSTEM SCIENCES 24.8(2020):4239-4255.