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DOI	10.5194/hess-24-4239-2020
	Physically based model for gully simulation: Application to the Brazilian semiarid region
	Henrique Lima Alencar P.; De Araujo J.C.; Dos Santos Teixeira A.
发表日期	2020
ISSN	1027-5606
起始页码	4239
结束页码	4255
卷号	24 期号:8
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 2m2) 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 R2 value of 0.94. © 2020 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	Agricultural robots; Antennas; Arid regions; Climatology; Economics; Erosion; Rain; Soil moisture; Arid and semi-arid regions; Channel cross section; Laboratory analysis; Physically based modeling; Physically based models; Research initiatives; Structure from motion; Sub-daily rainfall intensities; Landforms; arid region; connectivity; desertification; economic activity; environmental issue; gully; model validation; precipitation intensity; sedimentation; semiarid region; soil moisture; Brazil; Ceara
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159319
作者单位	Henrique Lima Alencar, P., Tu Berlin, Institut für Ökologie, Berlin, 10587, Germany, Federal University of Ceará, Departamento de Engenharia Agrícola, Fortaleza, Brazil; De Araujo, J.C., Federal University of Ceará, Departamento de Engenharia Agrícola, Fortaleza, Brazil; Dos Santos Teixeira, A., Federal University of Ceará, Departamento de Engenharia Agrícola, Fortaleza, Brazil
推荐引用方式 GB/T 7714	Henrique Lima Alencar P.,De Araujo J.C.,Dos Santos Teixeira A.. Physically based model for gully simulation: Application to the Brazilian semiarid region[J],2020,24(8).
APA	Henrique Lima Alencar P.,De Araujo J.C.,&Dos Santos Teixeira A..(2020).Physically based model for gully simulation: Application to the Brazilian semiarid region.Hydrology and Earth System Sciences,24(8).
MLA	Henrique Lima Alencar P.,et al."Physically based model for gully simulation: Application to the Brazilian semiarid region".Hydrology and Earth System Sciences 24.8(2020).