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Human movement and gully erosion: Investigating feedback mechanisms using Frequency Ratio and Least Cost Path analysis in Tigray, Ethiopia
Abstract
The cost of human movement, whether expressed in time, effort, or distance, is a function of natural and human related variables. At the same time, human movement itself, whether on land, air or sea, causes environmental cost. We are looking into the long-term environmental relationship of this interplay. Gullies—linear landforms, which dissect the landscape—are considered to be a cost for human movement, as they can form unpassable barriers destroying present path networks. On the other hand, human movement creates pathways, which flatten the surface and decrease the water permeability potential. This process results in runoff generation and possibly gully erosion. Accordingly, the spatial relationship between pathways and gullies is investigated. In the Tigray region of the Northern Ethiopian Highlands, gullies and pathways were mapped using remote sensing data. Frequency Ratio was used for assessing pathways as a variable affecting the location of gullies while Least Cost Paths were tested to evaluate the possible constraining impact gullies have on mobility. Based on these results, it is concluded that a positive feedback exists between the cost of human movement and gully erosion. We further discuss possible effects gullies may have had on trade, territory, and political affairs in Tigray. Consequently, we suggest that movement cost and gullying may not only hold strictly environmental or movement-related implications, but also socio-cultural ones.
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“The modelling of topographic least-cost paths is a common method to compute the most cost-effective connection between two or more points on basis of a digital elevation model (Seifried and Gardner, 2019;Nir et al., 2021).”
From Combining historical maps, travel itineraries and least-cost path modelling to reconstruct pre-modern travel routes and locations in northern tigray (ethiopia) (2023) · cites this paper as Nir et al., 2021
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“Least-cost path (LCP) analysis is a well-established tool to compute a preferred movement route between two points and is mostly based on topographic features (e.g.Alberti, 2019;Gowen and de Smet, 2020;Nir et al., 2021).”
From Combining historical maps, travel itineraries and least-cost path modelling to reconstruct pre-modern travel routes and locations in northern tigray (ethiopia) (2023) · cites this paper as Nir et al., 2021
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Least-cost paths in mountainous terrain
Rees, W. G. (2004) · Computers & Geosciences · doi:10.1016/j.cageo.2003.11.001 · Cited by 156
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Verhagen, P., Nuninger, L., & Groenhuijzen, M. R. (2019) · Computational Social Sciences · doi:10.1007/978-3-030-04576-0_11 · Cited by 117
Zigzagging: Theoretical insights on climbing strategies
Llobera, M., & Sluckin, T. J. (2007) · Journal of Theoretical Biology · doi:10.1016/j.jtbi.2007.07.020 · Cited by 103
Alberti, G. (2019) · SoftwareX · doi:10.1016/j.softx.2019.100331 · Cited by 40
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Gowen, K. M., & de Smet, T. S. (2020) · PLOS ONE · doi:10.1371/journal.pone.0239387 · Cited by 20
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Hardt, J., Nir, N., & Schütt, B. (2023) · The Cartographic Journal · doi:10.1080/00087041.2022.2150363 · Cited by 2
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- Authors
- Nir, N., Knitter, D., Hardt, J., & Schütt, B.
- Venue
- PLOS ONE
- Publisher
- Public Library of Science (PLoS)
- Published
- 2021-02-05
- Volume
- 16
- Issue
- 2
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- e0245248
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- 1932-6203
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- PMC7864406
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