Parameterization of the Effect of Bench Terraces on Runoff and Sediment Yield by Swat Modeling in a Small Semi‐arid Watershed in Northern Tunisia

Khelifa, Walid Ben; Hermassi, Taoufik; Strohmeier, Stefan; Zucca, Claudio; Ziadat, Feras; Boufaroua, Mohamed; Habaieb, Hamadi

doi:10.1002/ldr.2685

Cited by 51 publications

(30 citation statements)

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“…The evaluation coefficients of the simulated daily runoff of the different objective functions for both the TW and UW indicated satisfactory model fit according to the assessment criteria (Moriasi et al 2007). The NSE values found in the UW and the TW agree with Khelifa et al (2016) who studied the impact of SWC on runoff and sediment yield in Tunisia. These authors report NSE values for runoff simulations using SWAT of 0.64 and 0.68 for calibration and validation, respectively.…”

Section: Discussionsupporting

confidence: 87%

“…Similarly, Strohmeier et al (2015) reported that at plot scale, stone bunds reduced soil loss by 40% in the Gumara-Maksegnit watershed. In another study conducted in northern Tunisia on the effects of soil and water conservation structures on sediment load, Khelifa et al (2016) who estimated an overall soil loss reduction by 25%. The sediment yield estimated by SWAT model for the UW (44.8 t ha −1 year −1 ) and TW (33.5 t ha −1 year −1 ) was in agreement with other studies.…”

Section: Discussionmentioning

confidence: 99%

“…The evaluation coefficients of the simulated daily runoff of different objective functions for both the TW and UW indicated satisfactory model fit according to the assessment criteria (Moriasi et al 2007). Khelifa et al (2016) reported daily runoff with NSE values of 0.64 for calibration and 0.68 for validation. Similar studies are in better agreement with these results (Addis et al 2016;Zimale et al 2016).…”

Section: Runoff Calibration and Validationmentioning

confidence: 99%

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Prediction of soil and water conservation structure impacts on runoff and erosion processes using SWAT model in the northern Ethiopian highlands

et al. 2017

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Purpose Land degradation due to soil erosion is a serious threat to the highlands of Ethiopia. Various soil and water conservation (SWC) strategies have been in use to tackle soil erosion. However, the effectiveness of SWC measures on runoff dynamics and sediment load in terms of their medium-and short-term effects has not been sufficiently studied. Materials and methods A study was conducted in 2011 to 2015 in the Gumara-Maksegnit watershed to study the impacts of SWC structures on runoff and soil erosion processes using the soil and water analysis tool (SWAT) model. The study was conducted in two adjacent watersheds where in one of the watersheds, SWC structures were constructed (treated watershed (TW)) in 2011, while the other watershed was a reference watershed without SWC structures (untreated watershed (UW)). For both watersheds, separate SWAT and SWAT-CUP (SWAT calibration and uncertainty procedure) projects were set up for daily runoff and sediment yield. The SWAT-CUP program was applied to optimize the parameters of the SWAT using daily observed runoff and sediment yield data. Results and discussion The runoff simulations indicated that SWAT can reproduce the hydrological regime for both watersheds. The daily runoff calibration (2011)(2012)(2013) results for the TW and UW showed good correlation between the predicted and the observed data (R 2 = 0.78 for the TW and R 2 = 0.77 for the UW). The validation (2014)(2015) results also showed good correlation with R 2 values of 0.72 and 0.70 for the TW and UW, respectively. However, sediment yield calibration and validation results showed modest correlation between the predicted and observed sediment yields with R 2 values of 0.65 and 0.69 for the TW and UW for the calibration and R 2 values of 0.55 and 0.65 for the TW and UW for the validation, respectively. Conclusions The model results indicated that SWC structures considerably reduced soil loss by as much as 25-38% in the TW. The study demonstrated that SWAT performed well for both watersheds and can be a potential instrument for upscaling and assessing the impact of SWC structures on sediment loads in the highlands of Ethiopia.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Runoff Calibration and Validationmentioning

confidence: 99%

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Prediction of soil and water conservation structure impacts on runoff and erosion processes using SWAT model in the northern Ethiopian highlands

et al. 2017

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“…The results highlighted the ongoing dynamics of abandonment of agricultural terraces in relation to their main causes and effects. Khelifa et al () considered a small and terraced agricultural catchment (Sbaihia, Northern Tunisia) as an experimental site to analyse and parameterize the effects of bench‐terraces on water and sediment yield using the Soil and Water Assessment Tool. The results indicated that the local terraces, established on approximately 50% of the watershed area, reduced surface run‐off by around 19% and sediment yield by around 22%, decelerating the siltation of a highland lake.…”

Section: Overview Of the Papers In This Special Issuementioning

confidence: 99%

Agricultural Terraces Special Issue Preface

Tarolli

2018

Land Degrad Dev

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Agricultural terraces are a cultivation technique used, since ancient times, in many regions of the world. Terraces are built to reduce slope gradient and increase the infiltration of water; to mitigate soil erosion, collect rainwater run‐off, and concentrate it on a cropped plot; and to support agriculture in difficult environmental conditions (e.g., high‐steep slopes). Poorly designed and maintained terraces can lead to slope failures, often due to walls collapsing, and then large quantities of soil become vulnerable to run‐off erosion. The purpose of this Special Issue is to review the main environmental problems and opportunities that occur in a terraced landscape, explore how to monitor and date a terrace system, and provide useful guidance for landowners and practitioners who deal with terraced landscapes.

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“…Esses modelos foram desenvolvidos com o objetivo de avaliar a ocorrência de processos hidrossedimentológicos em diferentes escalas temporais e espaciais, com a possibilidade de inferir sobre diversos cenários. Dentre os modelos hidrossedimentológicos existentes, o SWAT (Soil and Water Assessment Tool) desenvolvido pelo Agricultural Research Service of the United States Departament of Agricultural (ARS -USDA), tem se destacado pela ampla utilização em todo o mundo (Gassman et al, 2007;Bressiani et al, 2015;Strehmel et al, 2016;Vigiak et al, 2016;Pereira et al, 2016b;Khelifa et al, 2017;Tirupathi et al, 2018).…”

Section: Introductionunclassified

Calibração hidrológica do modelo SWAT em bacia hidrográfica caracterizada pela expansão do cultivo da cana-de-açúcar

Martins

Moraes

et al. 2020

Rev. Bras. Geog. Fis.

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A dificuldade na gestão de recursos hídricos aliada à dinâmica do uso e ocupação do solo em bacias hidrográficas agrícolas são fatores relevantes para a conservação da água e solo. A gestão de bacias hidrográficas, bem como o monitoramento de cenários de expansão agrícola e mudança no uso do solo, podem se beneficiar de ferramentas de modelagem hidrossedimentológica, como o SWAT (Soil and Water Assessment Tool). Entretanto, para que os resultados obtidos sejam confiáveis, os modelos precisam ser calibrados. Objetivou-se, neste trabalho, calibrar e validar o modelo SWAT, para a variável vazão, tendo como base a bacia hidrográfica do Ribeirão do Pinhal, Limeira -São Paulo, que se caracteriza pela expansão da cana-de-açúcar sobre áreas citrícolas. Dados de vazão de um posto fluviométrico localizado no exutório da bacia foram utilizados para a calibração e validação, a partir de séries temporais diferentes. Utilizou-se o software QSWAT para a simulação hidrológica e o SWAT-CUP para a calibração e validação do modelo. O modelo foi calibrado e validado resultando nos seguintes índices estatísticos NSE=0,64; PBIAS=15,2 e RSR=0,60 para calibração e NSE=0,68 PBIAS=-2,8 e RSR=0,56 para a validação. O ajuste de parâmetros do SWAT (USLE_P, USLE_C, CN2) e do calendário de operações da cana-de-açúcar em acordo com a situação real da bacia foi necessário para a calibração do modelo. Os resultados indicam que o modelo SWAT subestima as vazões extremas, no entanto, dentro de faixa aceitável. O SWAT, após a calibração, pode ser utilizado na gestão de recursos hídricos na bacia do Ribeirão do Pinhal.Hydrological calibration of the SWAT model in a watershed characterized by the expansion of sugarcane cultivationA B S T R A C TThe difficulty in water resources management combined with the dynamics of land use and occupation in agricultural watersheds are relevant factors for water and soil conservation. River basin management, as well as monitoring scenarios of agricultural expansion and land-use change, can benefit from hydrossedimentological modeling tools such as the SWAT (Soil and Water Assessment Tool). However, for the results to be reliable, the models must be calibrated. The objective of this study was to calibrate and validate the SWAT model for the flow variable, based on the Ribeirão do Pinhal watershed, Limeira-São Paulo, which is characterized by the expansion of sugarcane over citrus areas. Flow data from a fluviometric station located in the basin's outfall were used for calibration and validation from different time series. QSWAT software was used for hydrological simulation and SWAT-CUP for model calibration and validation. The model was calibrated and validated resulting in the following statistical indices NSE = 0.64; PBIAS = 15.2 and RSR = 0.60 for calibration and NSE = 0.68 PBIAS = -2.8 and RSR = 0.56 for validation. Adjustment of SWAT parameters (USLE_P, USLE_C, and CN2) and the sugarcane operation schedule according to the actual basin situation was necessary for model calibration. The results indicate that the SWAT model underestimates the extreme flow rates, however, within an acceptable range. After calibration, the SWAT can be used to manage water resources in the Ribeirão do Pinhal basin.Keywords: Hydrologic simulation; land use; flow rate.

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Parameterization of the Effect of Bench Terraces on Runoff and Sediment Yield by Swat Modeling in a Small Semi‐arid Watershed in Northern Tunisia

Cited by 51 publications

References 30 publications

Prediction of soil and water conservation structure impacts on runoff and erosion processes using SWAT model in the northern Ethiopian highlands

Prediction of soil and water conservation structure impacts on runoff and erosion processes using SWAT model in the northern Ethiopian highlands

Agricultural Terraces Special Issue Preface

Calibração hidrológica do modelo SWAT em bacia hidrográfica caracterizada pela expansão do cultivo da cana-de-açúcar

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