Hydrogeomorphic processes affecting dryland gully erosion: implications for modelling

Sidle, Roy C., Jarihani, Ben, Kaka, SanLinn Kaka, Koci, Jack, and Al-Shaibani, Abdulaziz (2019) Hydrogeomorphic processes affecting dryland gully erosion: implications for modelling. Progress in Physical Geography, 43 (1). pp. 46-64.

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DOI: 10.1177%2F0309133318819403
View at Publisher Website: https://doi.org/10.1177%2F03091333188194...


Gullies contribute high sediment loads to receiving waters and significantly degrade landscapes. In drylands, low annual rainfall and resultant poor ground cover, coupled with high-intensity storms and dispersive soils, predispose these landscapes to gully erosion. Land management, such as grazing, exacerbates gully-forming processes by degrading ground cover and compacting soils, thereby increasing and concentrating overland flow. Current surface erosion models do not adequately represent sediment export from gullied terrain due to lack of distributed data and complex hydrogeomorphic processes, such as overland flow concentration, waterfall erosion, soil pipe collapse, and mass wasting. Here, we outline the strengths and weaknesses of past modelling approaches in erodible terrain and focus on how gully erosion processes can be better simulated at appropriate scales using newly available remote-sensing techniques and databases, coupled with improved understanding of relevant hydrogeomorphic processes. We also discuss and present examples of challenges related to assessing land management practices in drylands that affect gully erosion.

Item ID: 64351
Item Type: Article (Research - C1)
ISSN: 1477-0296
Keywords: Erosion, gully development, hydrogeomorphology, land management, drylands, sediment production
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Copyright Information: © The Author(s) 2018
Date Deposited: 15 Sep 2020 00:54
FoR Codes: 37 EARTH SCIENCES > 3709 Physical geography and environmental geoscience > 370901 Geomorphology and earth surface processes @ 50%
41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410404 Environmental management @ 50%
SEO Codes: 96 ENVIRONMENT > 9606 Environmental and Natural Resource Evaluation > 960699 Environmental and Natural Resource Evaluation not elsewhere classified @ 50%
96 ENVIRONMENT > 9612 Rehabilitation of Degraded Environments > 961299 Rehabilitation of Degraded Environments not elsewhere classified @ 50%
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