SWAT model uncertainties and cumulative probability for decreased phosphorus loading by agricultural Best Management Practices

Engebretsen, Alexander Melvold; Vogt, Rolf D.; Bechmann, Marianne

doi:10.1016/j.catena.2018.12.004

Cited by 21 publications

(9 citation statements)

References 37 publications

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“…Globally, several studies evaluated the effectiveness of BMPs to reduce sediment load and agricultural nutrients to freshwater ecosystems (e.g., Uniyal et al 2020;Briak et al 2019;Park et al 2014;Bosch et al 2013;Arabi et al 2008). However, majority of these studies were undertaken in North America (e.g., Lamba et al 2016;Bosch et al 2013;Arabi et al 2008), Europe (e.g., López-Ballesteros et al 2019;Engebretsen et al 2019;Lam et al 2011) and Asian continents (e.g., Uniyal et al 2020;Himanshu et al 2019;Park et al 2014). There are only few studies that evaluate BMPs in Africa (e.g., Briak et al 2019 in Morocco;Gathagu et al 2018 in Kenya; Betrie et al 2011 in Ethiopia).…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Effectiveness of Best Management Practices On Soil Erosion Reduction Using the SWAT Model: for the Case of Gumara Watershed, Abbay (Upper Blue Nile) Basin

Gashaw

Dile

Worqlul³

et al. 2021

Environmental Management

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This study was conducted to evaluate the effectiveness of best management practices (BMPs) to reduce soil erosion in Gumara watershed of the Abbay (Upper Blue Nile) Basin using the Soil and Water Assessment Tool (SWAT) model. The model was calibrated (1995-2002) and validated (2003-2007) using the SWAT-CUP based on observed streamflow and sediment yield data at the watershed outlet. The study evaluated four individual BMP Scenarios; namely, filter strips (FS), stone/soil bunds (SSB), grassed waterways (GW) and reforestation of croplands (RC), and three blended BMP Scenarios, which combines individual BMPS of FS and RC (FS & RC), GW and RC (GW & RC), and SSB and GW (SSB & GW). Mean annual sediment yield at the baseline conditions was estimated at 19.7 t ha −1 yr −1 , which was reduced by 13.7, 30.5, 16.2 and 25.9% in the FS, SSB, GW, and RC Scenarios, respectively at the watershed scale. The highest reduction efficiency of 34% was achieved through the implementations of the SSB & GW Scenario. The GW & RC, and FS & RC Scenarios reduced the baseline sediment yield by 32% and 29.9%, respectively. The study therefore concluded that the combined Scenarios mainly SSB & GW, and GW & RC can be applied to reduce the high soil erosion in the Gumera watershed, and similar agro-ecological watersheds in Ethiopia. In cases where applying the combined scenarios is not possible, the SSB Scenario can yield significant soil erosion reduction.

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Section: Introductionmentioning

confidence: 99%

Evaluating the Effectiveness of Best Management Practices On Soil Erosion Reduction Using the SWAT Model: for the Case of Gumara Watershed, Abbay (Upper Blue Nile) Basin

Gashaw

Dile

Worqlul³

et al. 2021

Environmental Management

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“…The average TP concentrations showed a significant correlation with the share of agricultural area (r 2 = 0.72; 0.03) and this relationship was better than for SS (r 2 = 0.56; 0.08). Modelling of effects mitigation measures for all of the Vestre Vansjø catchment using the SWAT-model, showed no significant effect of implemented best management practices when the modelling uncertainty was taken into account [44]. The high proportion of forested area (83%) in that study makes an evaluation of agricultural best management practices difficult.…”

Section: Concentrations Of Phosphorusmentioning

confidence: 71%

Implementation of Mitigation Measures to Reduce Phosphorus Losses: The Vestre Vansjø Pilot Catchment

2019

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Diffuse phosphorus loss from agricultural fields is an important contributor to the eutrophication of waterbodies. The objective of this study was to evaluate a pilot project for the implementation of mitigation measures to reduce P losses. The pilot project is situated in southwestern Norway and, covers a 14-year period (2004–2018). It included data on the implementation of mitigation measures and water quality monitoring for six small catchments. The mitigation measures consisted of no tillage in autumn, reduced P fertilizer application, grassed buffer zones, and sedimentation ponds. Extra efforts were made to reduce diffuse P losses during the period from 2008 to 2010. The project comprised economic incentives, an information campaign, and farm visits. Data from 2004 and 2010 showed that the use of P fertilizer during this period decreased by 80% and the area of no-till in autumn increased in all six catchments and covered 100% of the area in three of the six catchments in 2010. However, with decreased economic incentives after 2010, the degree to which the mitigation measures were implemented was reversed; P-fertilization increased, and no-till in autumn decreased. No significant effects of mitigation measures on total P and suspended sediment concentrations were detected. We conclude that economic incentives are necessary for the comprehensive implementation of mitigation measures and but that it is not always possible to show the effect on water quality.

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“…An integrated modelling approach predicting pesticide transfer in agricultural basins should include spatially distributed land use and agricultural management practices, soil characteristics and hydro-climatic conditions, upstream transfer risks (Figure 1D) and dissipation processes in ponds (Figure 1C). Such an integrated approach remains scarce and concerns mainly the pond hydrological dynamics [69] or the dissipation efficiency of macro-pollutants, such as nitrogen or phosphorus [70,71].…”

Section: Towards a Framework Integrating The Role Of Ponds At The Catchment Scalementioning

confidence: 99%

The Role of Ponds in Pesticide Dissipation at the Agricultural Catchment Scale: A Critical Review

Imfeld

Payraudeau

Tournebize

et al. 2021

Water

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Ponds in agricultural areas are ubiquitous water retention systems acting as reactive biogeochemical hotspots controlling pesticide dissipation and transfer at the catchment scale. Several issues need to be addressed in order to understand, follow-up and predict the role of ponds in limiting pesticide transfer at the catchment scale. In this review, we present a critical overview of functional processes underpinning pesticide dissipation in ponds. We highlight the need to distinguish degradative and non-degradative processes and to understand the role of the sediment-water interface in pesticide dissipation. Yet it is not well-established how pesticide dissipation in ponds governs the pesticide transfer at the catchment scale under varying hydro-climatic conditions and agricultural operation practices. To illustrate the multi-scale and dynamic aspects of this issue, we sketch a modelling framework integrating the role of ponds at the catchment scale. Such an integrated framework can improve the spatial prediction of pesticide transfer and risk assessment across the catchment-ponds-river continuum to facilitate management rules and operations.

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SWAT model uncertainties and cumulative probability for decreased phosphorus loading by agricultural Best Management Practices

Cited by 21 publications

References 37 publications

Evaluating the Effectiveness of Best Management Practices On Soil Erosion Reduction Using the SWAT Model: for the Case of Gumara Watershed, Abbay (Upper Blue Nile) Basin

Evaluating the Effectiveness of Best Management Practices On Soil Erosion Reduction Using the SWAT Model: for the Case of Gumara Watershed, Abbay (Upper Blue Nile) Basin

Implementation of Mitigation Measures to Reduce Phosphorus Losses: The Vestre Vansjø Pilot Catchment

The Role of Ponds in Pesticide Dissipation at the Agricultural Catchment Scale: A Critical Review

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