A fast and automated hydrologic calibration tool for SWAT

Özdemir, Ayfer; Leloglu, Ugur Murat

doi:10.1111/wej.12419

Cited by 19 publications

(7 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, a simplified approach in the SWAT model is employed to reckon soil temperature and confirm the frozen and thawed state of soils, and both also increase a small part of simulation uncertainty [2,40]. Uncertainties of the SWAT model were within acceptable limits, meaning that all source uncertainties were captured by parameter uncertainty in our study [15,17,21,23,54]. However, this does not neglect the significance of the spatiotemporal variability of precipitation [38,53] and model structures [2,55,56] during the whole calibration processes.…”

Section: Discussionmentioning

confidence: 92%

Simulating the Hydrological Processes of a Meso-Scale Watershed on the Loess Plateau, China

Leng

Wang

et al. 2020

Water

View full text Add to dashboard Cite

The Soil and Water Assessment Tool (SWAT) model is widely used to simulate watershed streamflow by integrating complex interactions between climate, geography, soil, vegetation, land use/land cover and other human activities. Although there have been many studies involving sensitivity analysis, uncertainty fitting, and performance evaluation of SWAT model all over the world, identifying dominant parameters and confirming actual hydrological processes still remain essential for studying the effect of climate and land use change on the hydrological regime in some water-limited regions. We used hydro-climate and spatial geographical data of a watershed with an area of 3919 km2, located on the Loess Plateau of China, to explore the suitable criterion to select parameters for running the model, and to elucidate the dominant ones that govern the hydrological processes for achieving the sound streamflow simulation. Our sensitivity analysis results showed that parameters not passing the sensitive check (p-value < 0.05) could play a significant role in hydrological simulation rather than only the parameters with p-value lower than 0.05, indicating that the common protocol is not appropriate for selecting parameters by sensitivity screening only. Superior performance of the rarely used parameter SOL_BD was likely caused by a combination of lateral and vertical movement of water in the loess soils due to the run-on infiltration process that occurred for meso-scale watershed monthly streamflow modeling, contrasting with traditionally held infiltration excessive overland flow dominated runoff generation mechanisms that prevail on the Loess Plateau. Overall, the hydrological processes of meso-scale watershed in the region could be well simulated by the model though underestimates of monthly streamflow could occur. Simulated water balance results indicated that the evapotranspiration in the region was the main component leaving the watershed, accounting for 88.9% of annual precipitation. Surface runoff contributed to 63.2% of the streamflow, followed by lateral flow (36.6%) and groundwater (0.2%). Our research highlights the importance for selecting more appropriate parameters for distributed hydrological models, which could help modelers to better comprehend the meso-scale watershed runoff generation mechanism of the Loess Plateau and provide policy makers robust tool for developing sustainable watershed management planning in water-limited regions.

show abstract

Section: Discussionmentioning

confidence: 92%

Simulating the Hydrological Processes of a Meso-Scale Watershed on the Loess Plateau, China

Leng

Wang

et al. 2020

Water

View full text Add to dashboard Cite

show abstract

“…It does not have its own GUI, therefore, integrates with the Geographical Information System platform for the modeling process (Olivera et al, 2006). Besides, Automatic parameter optimization is an inbuilt feature of the SWAT (Li et al, 2010;Ozdemir and Leloglu, 2019).…”

Section: Methodsmentioning

confidence: 99%

Macro-level study on Climate Change effects on agriculture and human health in Western Himalayas: A Review

Mohanty¹

2021

JWEAM

View full text Add to dashboard Cite

The current study reveals that the western Himalayas has a fragile ecosystem, highly susceptible to rapid changes in land morphology due to the consequences of climate change. Land-use and climatic change in this region has negative impacts on agriculture and human health. Increasing temperature, erratic precipitation, and rising CO2 concentrations are the main drivers which show adverse effects on agriculture and human health. The impacts trends in this region can be categorised into exacerbated pathogenicity are pathogens, and hence disease outbreaks, changes in the traditional agriculture techniques, and people’s migration that directly changes in ecological and leading to social inequalities. In the last few decades, there have been changes in vector species distribution in agriculture and increases of forest pest species attacks by climate change in agriculture and forest pest increases, and parasites are emerging during periods of these last few decades. Enhancement of seasonal transmission and distribution of pests pushes food insecurity and vector-borne infections deteriorate human health. This review article tries to analyse different literature on the effects of climate change on agriculture and human health in the Western Himalayas and suggest agroforestry and agroecology is some of the strategies to overcome climate change impact.

show abstract

“…These sensitive parameters were calibrated using a software package called Fast Automatic Calibration Tool (FACT). FACT was developed to improve the performance of automatic calibration procedures for SWAT models [58]. The optimization method used in FACT is the Sequential Uncertainty Conformity Algorithm (SUFI-2), as this algorithm can handle a large number of parameters and perform uncertainty analyses.…”

Section: Model Setup and Calibrationmentioning

confidence: 99%

The Effects of Climate Change on Streamflow, Nitrogen Loads, and Crop Yields in the Gordes Dam Basin, Turkey

Özdemir,

Volk,

Strauch

et al. 2024

Water

View full text Add to dashboard Cite

The Mediterranean region is highly vulnerable to climate change. Longer and more intense heatwaves and droughts are expected. The Gordes Dam in Turkey provides drinking water for Izmir city and irrigation water for a wide range of crops grown in the basin. Using the Soil and Water Assessment Tool (SWAT), this study examined the effects of projected climate change (RCP 4.5 and RCP 8.5) on the simulated streamflow, nitrogen loads, and crop yields in the basin for the period of 2031–2060. A hierarchical approach to define the hydrological response units (HRUs) of SWAT and the Fast Automatic Calibration Tool (FACT) were used to reduce computational time and improve model performance. The simulations showed that the average annual discharge into the reservoir is projected to increase by between 0.7 m3/s and 4 m3/s under RCP 4.5 and RCP 8.5 climate change scenarios. The steep slopes and changes in precipitation in the study area may lead to higher simulated streamflow. In addition, the rising temperatures predicted in the projections could lead to earlier spring snowmelt. This could also lead to increased streamflow. Projected nitrogen loads increased by between 8.8 and 25.1 t/year. The results for agricultural production were more variable. While the yields of poppy, tobacco, winter barley, and winter wheat will increase to some extent because of climate change, the yields of maize, cucumbers, and potatoes are all predicted to be negatively affected. Non-continuous and limited data on water quality and crop yields lead to uncertainties, so that the accuracy of the model is affected by these limitations and inconsistencies. However, the results of this study provide a basis for developing sustainable water and land management practices at the catchment scale in response to climate change. The changes in water quality and quantity and the ecological balance resulting from changes in land use and management patterns for economic benefit could not be fully demonstrated in this study. To explore the most appropriate management strategies for sustainable crop production, the SWAT model developed in this study should be further used in a multi-criteria land use optimization analysis that considers not only crop yields but also water quantity and quality targets.

show abstract

A fast and automated hydrologic calibration tool for SWAT

Cited by 19 publications

References 29 publications

Simulating the Hydrological Processes of a Meso-Scale Watershed on the Loess Plateau, China

Simulating the Hydrological Processes of a Meso-Scale Watershed on the Loess Plateau, China

Macro-level study on Climate Change effects on agriculture and human health in Western Himalayas: A Review

The Effects of Climate Change on Streamflow, Nitrogen Loads, and Crop Yields in the Gordes Dam Basin, Turkey

Contact Info

Product

Resources

About