Optimal Calibration and Uncertainty Analysis of SWAT for an Arid Climate

Jajarmizadeh, Milad; Sidek, Lariyah Mohd; Harun, Sobri; Salarpour, Mohsen

doi:10.1177/1178622117731792

Cited by 9 publications

(5 citation statements)

References 23 publications

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“…It should be emphasized that our results in this study are conditioned on the data and procedures used for this study. We are aware that input data [63], discretization of the region of study [64,65], regionalization of the parameters [66], method of calibration and the choice of objective function [67] all affect final parameter ranges and their sensitivities.…”

Section: Discharge Calibration and Validation Results In The Main Chamentioning

confidence: 99%

Simulating Flash Floods at Hourly Time-Step Using the SWAT Model

Boithias

Sauvage

Lenica

et al. 2017

Water

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Flash floods are natural phenomena with environmental, social and economic impacts. To date, few numerical models are able to simulate hydrological processes at catchment scale at a reasonable time scale to describe flash events with accurate details. Considering a~810 km 2 Mediterranean river coastal basin (southwestern France) as a study case, the objective of the present study was to assess the ability of the sub-daily module of the lumped Soil and Water Assessment Tool (SWAT) to simulate discharge (1) time-continuously, by testing two sub-basin delineation schemes, two catchment sizes, and two output time-steps; and (2) at flood time-scale, by comparing the performances of SWAT to the performances of the event-based fully distributed MARINE model when simulating flash flood events. We showed that there was no benefit of decreasing the size of the minimum drainage area (e.g., from~15 km 2 down to~1 km 2 ) when delineating sub-basins in SWAT. We also showed that both the MARINE and SWAT models were equally able to reproduce peak discharge, flood timing and volume, and that they were both limited by rainfall and soil data. Hence, the SWAT model appears to be a reliable modelling tool to predict discharge over long periods of time in large flash-flood-prone basins.

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Section: Discharge Calibration and Validation Results In The Main Chamentioning

confidence: 99%

Simulating Flash Floods at Hourly Time-Step Using the SWAT Model

Boithias

Sauvage

Lenica

et al. 2017

Water

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“…The initial step in the SWAT model calibration and validation procedure would be to choose the most sensitive parameters for a specific catchment [46]. This study set the global sensitivity method to select the most sensitive parameters during calibration [47][48][49][50].…”

Section: Model Calibration and Validationmentioning

confidence: 99%

Impact of Climate Change on the Water Balance of the Akaki Catchment

Guyasa,

Guan,

Zhang

2023

Water

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Climate change has an impact on water resources. Estimations of the variations in water balance under climate change variables are essential for managing and developing the water resource of a catchment. The current investigation evaluated the magnitude of the change in the water balance component of the Akaki catchment, Ethiopia, using the semi-distributed hydrological model, the Soil and Water Assessment Tool (SWAT), with the integration of the Coordinated Regional Downscaling Experiment of Africa under RCP4.5 and 8.5. The SWAT model was developed using spatial and temporal data; it was calibrated (1991–2001) and validated (2002–2004) using SWAT-CUP. The statistical monthly SWAT model performance values of the NSE, PBIAS (%), and R2 showed good agreement between calibration and validation. On an annual basis, projected rainfall is expected to increase by 14.96%, 4.13%, 8.39%, and 10.39% in the 2040s under RCP4.5 and 8.5 and in the 2060s under RCP4.5 and 8.5, respectively, with inconsistent change on a monthly projections basis for each scenario. The projected monthly and yearly temperatures are expected to increase under different climate change scenarios. Annual evapotranspiration and potential evapotranspiration increased under both RCPs, whereas surface runoff, lateral flow, and water yield declined under the climate scenarios of each RCP. Monthly projected water yield showed a non-uniform change in the first 30 years and in the second years under the RCP4.5 and RCP8.5 scenarios. These results show that the catchment is highly vulnerable to hydrological and agricultural drought due to water availability. These research findings provide valuable evidence on the role of climate change in water balance, which will help decision makers to achieve better water resource management.

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“…NS ranges from -∞ to 1. The optimal value is 1, corresponding to the situation where the plot of observed data fits the simulation (Khoiab & Thomb 2015) perfectly, while values less than 0 indicate that the observed data mean is a more accurate predictor than the simulated output (Jajarmizadeh et al 2017). The target interval for PBIAS is zero to +25%, with zero corresponding to the optimum.…”

Section: Model Performance Measuresmentioning

confidence: 99%

Impacts of urbanization and climate change on water quantity and quality in the Carp River watershed

Zango

Seidou

Sartaj

et al. 2021

Journal of Water and Climate Change

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Pressure on water resources has reached unprecedented levels during the last decades because of climate change, industrialization, and population growth. As a result, vulnerability to inappropriate water availability and/or quality is increasing worldwide. In this paper, a Soil & Water Assessment Tool (SWAT) model of the Carp river watershed located in the city of Ottawa, Ontario was calibrated and validated. The model was then used to evaluate the individual and coupled impacts of urbanization and climate change on water quantity (discharge) and quality (nitrogen and phosphorus loads). While most of the watershed is currently rural, the headwaters will undergo rapid urbanization in the future, and there are concerns about possible negative impacts on water quantity and quality. Seven scenarios were developed to represent various watershed configurations in terms of land use and climate regime. Future climate time series were obtained by statistically downscaling the outputs of nine regional climate models, ran under representative concentration pathways (RCP)4.5 and RCP8.5. The impacts were evaluated at the main outlet and at the outlet of an upstream sub-watershed that would be most affected by urbanization. Results show that climate change and urbanization's impacts vary greatly depending on the spatial scale and geographic location. Globally, the annual average discharge will increase between 6.75 and 9.34% by 2050, while changes in annual average nitrogen and phosphorus loads will vary between −1.20 and 24.84%, and 19.15 and 23.81%, respectively. Local impacts in sub-watersheds undergoing rapid urbanization would be often much larger than watershed-scale impacts.

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Optimal Calibration and Uncertainty Analysis of SWAT for an Arid Climate

Cited by 9 publications

References 23 publications

Simulating Flash Floods at Hourly Time-Step Using the SWAT Model

Simulating Flash Floods at Hourly Time-Step Using the SWAT Model

Impact of Climate Change on the Water Balance of the Akaki Catchment

Impacts of urbanization and climate change on water quantity and quality in the Carp River watershed

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