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Ms. Selamawit Amare
Wageningen University and Research

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0 Erosion
0 Sediment
0 Runoff
0 soil saturation
0 badlands

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Journal article
Published: 18 January 2021 in Water
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Soil erosion by gullies in Ethiopia is causing environmental and socioeconomic problems. A sound soil and water management plan requires accurately predicted gully erosion hotspot areas. Hence, this study develops a gully erosion susceptibility map (GESM) using frequency ratio (FR) and random forest (RF) algorithms. A total of 56 gullies were surveyed, and their extents were derived by digitizing Google Earth imagery. Literature review and a multicollinearity test resulted in 14 environmental variables for the final analysis. Model prediction potential was evaluated using the area under the curve (AUC) method. Results showed that the best prediction accuracy using the FR and RF models was obtained by using the top four most important gully predictor factors: drainage density, elevation, land use, and groundwater table. The notion that the groundwater table is one of the most important gully predictor factors in Ethiopia is a novel and significant quantifiable finding and is critical to the design of effective watershed management plans. Results from separate variable importance analyses showed land cover for Nitisols and drainage density for Vertisols as leading factors determining gully locations. Factors such as texture, stream power index, convergence index, slope length, and plan and profile curvatures were found to have little significance for gully formation in the studied catchment.

ACS Style

Selamawit Amare; Eddy Langendoen; Saskia Keesstra; Martine Ploeg; Habtamu Gelagay; Hanibal Lemma; Sjoerd Zee. Susceptibility to Gully Erosion: Applying Random Forest (RF) and Frequency Ratio (FR) Approaches to a Small Catchment in Ethiopia. Water 2021, 13, 216 .

AMA Style

Selamawit Amare, Eddy Langendoen, Saskia Keesstra, Martine Ploeg, Habtamu Gelagay, Hanibal Lemma, Sjoerd Zee. Susceptibility to Gully Erosion: Applying Random Forest (RF) and Frequency Ratio (FR) Approaches to a Small Catchment in Ethiopia. Water. 2021; 13 (2):216.

Chicago/Turabian Style

Selamawit Amare; Eddy Langendoen; Saskia Keesstra; Martine Ploeg; Habtamu Gelagay; Hanibal Lemma; Sjoerd Zee. 2021. "Susceptibility to Gully Erosion: Applying Random Forest (RF) and Frequency Ratio (FR) Approaches to a Small Catchment in Ethiopia." Water 13, no. 2: 216.

Review
Published: 17 September 2019 in Land
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Valley bottomland provides diverse agricultural and ecosystem benefits. Due to concentrated flow paths, they are more vulnerable to gully erosion than hillslope areas. The objective of this review was to show what caused valley bottoms gullies and to present deficiencies in existing rehabilitation measures. From the literature review, we found the following general trends: watershed characteristics determine location of valley bottom gullies; an increase in water transported from the watershed initiates the formation of gullies; the rate of change of the valley bottom gullies, once initiated, depends on the amount of rainfall and the soil and bedrock properties. Especially in humid climates, the presence of subsurface flow greatly enhances bank slippage and advancement of gully heads. Valley bottom gully reclamation measures are generally effective in arid and semi-arid areas with the limited subsurface flow and deep groundwater tables, whereas, for (sub) humid regions, similar remedial actions are not successful as they do not account for the effects of subsurface flows. To ensure effective implementation of rehabilitation measures, especially for humid regions, an integrated landscape approach that accounts for the combined subsurface and surface drainage is needed.

ACS Style

Selamawit Amare; Saskia Keesstra; Martine Van Der Ploeg; Eddy Langendoen; Tammo Steenhuis; Seifu Tilahun. Causes and Controlling Factors of Valley Bottom Gullies. Land 2019, 8, 141 .

AMA Style

Selamawit Amare, Saskia Keesstra, Martine Van Der Ploeg, Eddy Langendoen, Tammo Steenhuis, Seifu Tilahun. Causes and Controlling Factors of Valley Bottom Gullies. Land. 2019; 8 (9):141.

Chicago/Turabian Style

Selamawit Amare; Saskia Keesstra; Martine Van Der Ploeg; Eddy Langendoen; Tammo Steenhuis; Seifu Tilahun. 2019. "Causes and Controlling Factors of Valley Bottom Gullies." Land 8, no. 9: 141.