Assessment of gully erosion in eastern Ethiopia using photogrammetric techniques

Daba, Shibru; Rieger, Wolfgang; Strauß, Peter

doi:10.1016/s0341-8162(02)00135-2

Cited by 172 publications

(105 citation statements)

References 13 publications

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“…In the past, visual interpretation of aerial photographs and coarse satellite imagery was applied for mapping gully erosion [21]. Furthermore, the assessment of gully erosion from two different points in time was based on the manual interpretation of aerial photographs [22]. Vrieling et al [23] applied a supervised classification approach of the maximum likelihood classifier for automatic identification of gullies based on ASTER imagery in the Brazilian Cerrados.…”

Section: Existing Mapping Approaches For Gulliesmentioning

confidence: 99%

Detection of Gully-Affected Areas by Applying Object-Based Image Analysis (OBIA) in the Region of Taroudannt, Morocco

et al. 2014

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This study aims at the detection of gully-affected areas by applying object-based image analysis in the region of Taroudannt, Morocco, which is highly affected by gully erosion while simultaneously representing a major region of agro-industry with a high demand of arable land. As high-resolution optical satellite data are readily available from various sensors and with a much better temporal resolution than 3D terrain data, an area-wide mapping approach to extract gully-affected areas using only optical satellite imagery was developed. The methodology additionally incorporates expert knowledge and freely-available vector data in a cyclic object-based image analysis approach. This connects the two fields of geomorphology and remote sensing. The classification results show the successful implementation of the developed approach and allow conclusions on the current distribution of gullies. The results of the classification were checked against manually delineated reference data incorporating expert knowledge based on several field campaigns in the area, resulting in an overall classification accuracy of 62%. The error of omission accounts for 38% and the error of commission for 16%, respectively. Additionally, a manual assessment was carried out to assess the quality of the applied classification algorithm. The limited error of omission contributes with 23% to the overall error of omission and the limited error of commission contributes with 98% to the overall error of commission. This assessment improves the results and confirms the high quality of the developed approach for area-wide mapping of gully-affected areas in larger regions. In the field of landform Remote Sens. 2014, 6 8288 mapping, the overall quality of the classification results is often assessed with more than one method to incorporate all aspects adequately.

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Section: Existing Mapping Approaches For Gulliesmentioning

confidence: 99%

Detection of Gully-Affected Areas by Applying Object-Based Image Analysis (OBIA) in the Region of Taroudannt, Morocco

et al. 2014

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“…(4) was tested by Caraballo-Arias et al (2014) for the 25 badland channels. Figure 3 shows the relationship (4) calibrated by L-V pairs observed on rills, EGs and gullies by Ichim et al (1990), Daba et al (2003), Bruno et al (2008), Moges and Holden (2008) and Di Stefano and Ferro (2011). This figure demonstrates that the power equation (4) can be applied for rill, EG and gully data using the same exponent b, equal to 1.1, and a different scale factor (a = 0.0036 for rills, a = 0.0984 for EGs and a = 35.8 for gullies).…”

Section: Badland Morphologymentioning

confidence: 98%

“…Figure 4 shows the pairs of the dimensionless groups obtained from the literature data (Daba et al, 2003;Cheng et al, 2006;Zhang et al, 2007;Moges and Holden, 2008;Capra et al, 2009;Di Stefano and Ferro, 2011) and the ones corresponding to badlands. The diagram shows how badland points are well predicted by a power regression model (Eq.…”

Section: Badland Morphologymentioning

confidence: 99%

Assessing, measuring and modelling erosion in calanchi areas: a review

Caraballo-Arias¹,

Ferro²

2016

J Agricult Engineer

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Calanchi are erosion landforms characterised by a heavily dissected terrain with steep, unvegetated slopes and channels with a dendritic pattern, which rapidly incise and extend headwards. Recent literature focusing on badland systems highlights their similarity with other larger fluvial landforms, stating that these behave as a full size laboratory, due to their rapid development in space and time and to the diversity of geomorphic processes involved.In this paper, a brief review of the most important results on badland research is firstly presented. Then, the morphometric similarity between calanchi and other erosion landforms is discussed. Finally, models quantitatively relating the volume of sediments eroded from calanchi landforms and a set of geometric features of their tributary areas, by exploiting the dimensional analysis and the self-similarity theory, are presented.

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“…In the Ethiopian highlands, gullies are particularly severe covering large tracts of areas and silting up rivers and reservoirs [2][3][4]. Extensive areas of agricultural lands are affected each year leading to irreversible changes in soil productivity and affecting the food security [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Gully Headcut Treatment on Sediment Load and Gully Expansion in the Sub Humid Ethiopian Highlands

Zegeye¹,

Steenhuis²,

Mekuria³

et al. 2017

eer

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The Ethiopian government has been implementing a land restoration program that aimed to restore degraded ecosystems and double agricultural productivity throughout the country since 2010. However, the success of the restoration program has been limited due to the lack of integrating gully erosion control measures. Consequently, many reservoirs in Ethiopia and downstream riparian countries have lost their storage capacity due to sedimentation, and studies demonstrated that gully erosion is one of the degradation hotspots within watersheds and contribute considerable proportion of the total sediment loads from a particular watershed. This study was conducted in one of large gullies in the Debre-Mawi watershed, northwestern Ethiopia to quantify the effect of gully head treatment in reducing the amount of sediment load generated from uplands and from the gully itself. We measured discharge, and sediment load and concentration in 2013 and 2014 at the upstream (inlet) and downstream ends (outlet) of the studied gully. Before the 2014 rainy phase, a gully headcut was stabilized with gabions at the bed and the gully bank was regarded to 45 o . The gully head retreated 12 m in 2013 but gully head retreat was stopped following the implementation of the treatment in 2014. The total sediment load and sediment concentration at the outlet was reduced by 42% and 30% respectively, in 2014 (i.e., after treatment) when compared to 2013 (i.e., before treatment). The result of this study support that controlling the upward retreat of gully head is effective in reducing sediment load and concentration as well as upward movement and expansion of gullies. However, maintenance of gully head control measures is the key to sustain the benefits.

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Assessment of gully erosion in eastern Ethiopia using photogrammetric techniques

Cited by 172 publications

References 13 publications

Detection of Gully-Affected Areas by Applying Object-Based Image Analysis (OBIA) in the Region of Taroudannt, Morocco

Detection of Gully-Affected Areas by Applying Object-Based Image Analysis (OBIA) in the Region of Taroudannt, Morocco

Assessing, measuring and modelling erosion in calanchi areas: a review

Effect of Gully Headcut Treatment on Sediment Load and Gully Expansion in the Sub Humid Ethiopian Highlands

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