Testing and evaluation of the agricultural non-point source pollution model (AGNPS) on Augucho catchment, western Hararghe, Ethiopia

Haregeweyn, Nigussie; Yohannes, Fekadu

doi:10.1016/s0167-8809(02)00120-2

Cited by 112 publications

(58 citation statements)

References 5 publications

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“…However, there are a few applications of erosion modelling in the Upper Blue Nile basin. These include Zeleke (2000), Haregeweyn and Yohannes (2003), Mohamed et al (2004), Hengsdijk et al (2005), Steenhuis et al (2009), and Setegn et al (2010). Zeleke (2000) simulated soil loss using the Water Erosion Prediction Project (WEPP) model and the result slightly underestimated the observed soil loss in the Dembecha catchment (27 100 ha).…”

Section: Introductionmentioning

confidence: 99%

“…Zeleke (2000) simulated soil loss using the Water Erosion Prediction Project (WEPP) model and the result slightly underestimated the observed soil loss in the Dembecha catchment (27 100 ha). Haregeweyn and Yohannes (2003) applied the Agricultural Non-Point Source (AGNPS) model and well predicted sediment yield in the Augucho catchment (224 ha). The same AGNPS model was used by Mohamed et al (2004) to simulate sediment yield in the Kori (108 ha) catchment and the result was satisfactory.…”

Section: Introductionmentioning

confidence: 99%

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Sediment management modelling in the Blue Nile Basin using SWAT model

Betrie

Mohamed

Griensven

et al. 2011

Hydrol. Earth Syst. Sci.

356

235

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Abstract. Soil erosion/sedimentation is an immense problem that has threatened water resources development in the Nile river basin, particularly in the Eastern Nile (Ethiopia, Sudan and Egypt). An insight into soil erosion/sedimentation mechanisms and mitigation methods plays an imperative role for the sustainable water resources development in the region. This paper presents daily sediment yield simulations in the Upper Blue Nile under different Best Management Practice (BMP) scenarios. Scenarios applied in this paper are (i) maintaining existing conditions, (ii) introducing filter strips, (iii) applying stone bunds (parallel terraces), and (iv) reforestation. The Soil and Water Assessment Tool (SWAT) was used to model soil erosion, identify soil erosion prone areas and assess the impact of BMPs on sediment reduction. For the existing conditions scenario, the model results showed a satisfactory agreement between daily observed and simulated sediment concentrations as indicated by Nash-Sutcliffe efficiency greater than 0.83. The simulation results showed that applying filter strips, stone bunds and reforestation scenarios reduced the current sediment yields both at the subbasins and the basin outlets. However, a precise interpretation of the quantitative results may not be appropriate because some physical processes are not well represented in the SWAT model.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sediment management modelling in the Blue Nile Basin using SWAT model

Betrie

Mohamed

Griensven

et al. 2011

Hydrol. Earth Syst. Sci.

356

235

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“…In the Universal Soil Loss Equation modified for Ethiopian conditions by Hurni (1985), the decrease in sediment concentration was incorporated in the C (vegetation) factor of the plants Eweg et al, 1998;Haile et al, 2006). Models developed in temperate climates such as the Agricultural NonPoint Source (AGNPS) Pollution Model (Haregeweyn and Yohannes, 2003;Mohammed et al, 2004), the Soil and Water Assessment Tool (SWAT) (Setegn et al, 2008(Setegn et al, , 2011, and Water Erosion Prediction Project (WEPP; Zeleke, 2000) can only predict monthly trends well under Ethiopian conditions. To account for Ethiopian conditions, Easton et al (2010) and White et al (2010) modified SWAT and replaced infiltration excess runoff processes by saturation excess and switched erosion controls from upland to channel factors after midAugust.…”

Section: Introductionmentioning

confidence: 99%

Suspended sediment concentration–discharge relationships in the (sub-) humid Ethiopian highlands

Guzmán

Tilahun

Zegeye

et al. 2013

Hydrol. Earth Syst. Sci.

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Abstract. Loss of top soil and subsequent filling up of reservoirs in much of the lands with variable relief in developing countries degrades environmental resources necessary for subsistence. In the Ethiopia highlands, sediment mobilization from rain-fed agricultural fields is one of the leading factors causing land degradation. Sediment rating curves, produced from long-term sediment concentration and discharge data, attempt to predict suspended sediment concentration variations, which exhibit a distinct shift with the progression of the rainy season. In this paper, we calculate sediment rating curves and examine this shift in concentration for three watersheds in which rain-fed agriculture is practiced to differing extents. High sediment concentrations with low flows are found at the beginning of the rainy season of the semi-monsoonal climate, while high flows and low sediment concentrations occur at the end of the rainy season. Results show that a reasonably unique set of rating curves were obtained by separating biweekly data into early, mid, and late rainfall periods and by making adjustments for the ratio of plowed cropland. The shift from high to low concentrations suggests that diminishing sediment supply and dilution from greater base flow during the end of the rainfall period play important roles in characterizing changing sediment concentrations during the rainy season.

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“…Several attempts have been made to use such process-based models such as the Water Erosion Prediction Project model (Gete, 1999;Haregeweyn et al, 2013), the Agricultural Nonpoint Source Pollution model (Haregeweyn and Yohannes, 2003;Hussen et al, 2004) …”

Section: Introductionmentioning

confidence: 99%

Empirical Estimation of the Spatial Sediment Transport Capacity Coefficient Using the Rain Erosivity Factor and SWAT Model Results in the Han River Basin, South Korea

Jung

Jang

Kim

2017

Preprint

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Abstract.The ratio of sediment delivery is a critical and uncertain factor in model-based assessments of the total sediment yield of watersheds that results from the transport of sediment produced by soil erosion. This study estimates the watershed-10 scale distribution of sediment yield at a spatial resolution of 1 km by 1 km through evaluating the rain erosivity (R) factor of the Revised Universal Soil Loss Equation ( Hydrol. Earth Syst. Sci. Discuss., https://doi

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Testing and evaluation of the agricultural non-point source pollution model (AGNPS) on Augucho catchment, western Hararghe, Ethiopia

Cited by 112 publications

References 5 publications

Sediment management modelling in the Blue Nile Basin using SWAT model

Sediment management modelling in the Blue Nile Basin using SWAT model

Suspended sediment concentration–discharge relationships in the (sub-) humid Ethiopian highlands

Empirical Estimation of the Spatial Sediment Transport Capacity Coefficient Using the Rain Erosivity Factor and SWAT Model Results in the Han River Basin, South Korea

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