DOI: 10.5194/hess-24-4239-2020
论文题名: Physically based model for gully simulation: Application to the Brazilian semiarid region
作者: Henrique Lima Alencar P. ; De Araujo J.C. ; Dos Santos Teixeira A.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期: 8 起始页码: 4239
结束页码: 4255
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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162609
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
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]. Hydrology and Earth System Sciences,2020-01-01,24(8)