A study on subcatchment scale for a distributed runoff model

Hayakawa, Hiroshi; Uchijima, Kunihide; Fujita, Mutsuhiro

doi:10.1016/0160-4120(95)00047-o

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…After a threshold level, any further subdivision produced little change in runoff hydrograph generation. Hayakawa et al (1995) studied the appropriate size of subwatersheds based on the geomorphology of the channel network and found the hydrologic response of various subwatershed sizes is dependent on corresponding changes in topography within the subwatersheds. Robinson et al (1995) studied the effect of watershed size on the characterization of various watershed properties related to runoff response.…”

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confidence: 99%

Effect of Watershed Subdivision on Simulation Runoff and Fine Sediment Yield

Bingner¹,

Garbrecht²,

Arnold³

et al. 1997

Transactions of the ASAE

115

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The objective of this study was to establish the subwatershed size dependency of the Soil and Water Analysis Tool (SWAT) erosion model to adequately simulate annual runoff and fine sediment (< 0.063 mm) from the 21.3 km 2 Goodwin Creek Watershed (GCW). Results of the GCW application show that runoff volume is not appreciably affected by the number and size of subwatersheds. However, an upper limit to subwatershed size is required to adequately simulate fine sediment yield produced from upland sources. Decreasing the size of subwatersheds beyond this threshold does not substantially affect the computed fine sediment yield. The proper identification of this threshold size can optimize input data preparation requirements and computational resources needed for effective utilization of the SWAT model, and simplify the interpretation of results.

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confidence: 99%

Effect of Watershed Subdivision on Simulation Runoff and Fine Sediment Yield

Bingner¹,

Garbrecht²,

Arnold³

et al. 1997

Transactions of the ASAE

115

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“…They also demonstrated that the simulated runoff hydrograph changed little after a threshold level of watershed subdivision. Hayakawa et al (1995) concluded that an appropriate size of sub-watershed was based on the geomorphology of the channel network and found that the hydrological response of various subdivisions was dependent on the interrelation between the variations in topography and channel network within sub-watersheds. Bingner et al (1997) investigated the effect of watershed subdivision on runoff and sediment yield for the Goodwin Creek Watershed using the Soil and Water Assessment Tool (SWAT).…”

Section: Introductionmentioning

confidence: 99%

Effects of watershed subdivision level on semi-distributed hydrological simulations: case study of the SLURP model applied to the Xiangxi River watershed, China

Han

Huang

Zhang

et al. 2013

Hydrological Sciences Journal

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-P., 2013. Effects of watershed subdivision level on semi-distributed hydrological simulations: case study of the SLURP model applied to the Xiangxi River watershed, China. Hydrological Sciences Journal, 59 (1), 108-125. Abstract This study investigates the impacts of watershed subdivision on hydrological simulations. The SLURP (Semi-distributed Land Use-based Runoff Processes) model was employed in the Xiangxi River watershed, China, with eight watershed subdivision schemes. Under each scheme, the SLURP model was calibrated using both manual and automatic methods to simulate watershed hydrological processes over the period 1991-1998. The results indicate that model performance could be enhanced by increasing the degree of subdivision. However, there is a threshold level, beyond which no significant improvements can be obtained. The simulated water balance components and runoff contributions from different land types were found to vary among subdivision levels. Differences were slight when the watershed was divided into more than 73 sub-watersheds. These results were partly caused by the altitude-based precipitation correction, where the reduced generalization of terrain characteristics could lead to increasing consideration of small watersheds in the weighted Thiessen polygon technique; thus, the elevation-correction adjustments in deriving distributed meteorological inputs were increased. Parameter sensitivity analysis revealed that increasing the subdivision level was likely to enhance model efficiency. However, the difference became negligible among fine subdivisions. Although a threshold was identified in this study, determination of an appropriate subdivision level should also be based on the modelling objective, the quality of model inputs, the complexity of the watershed system and the resulting uncertainty.Key words hydrological modelling; sub-watershed; water balance component; land type; sensitivity; Three Gorges Reservoir Effets du niveau de subdivision du bassin versant sur les simulations hydrologiques semidistribuées: étude de cas sur le modèle SLURP appliqué au bassin versant de la rivière Xiangxi en Chine Résumé Cette étude examine les effets de la subdivision du bassin versant sur les simulations hydrologiques. Pour cela, nous avons appliqué le modèle SLURP (Semi-distributed Land Use-based Runoff ProcessesProcessus de ruissellement semi-distribués basés sur l'utilisation des sols) au bassin versant de la rivière Xiangxi avec huit schémas de subdivision du bassin. Pour chaque schéma, le modèle SLURP a été calé en utilisant des méthodes manuelles et automatiques pour simuler les processus hydrologiques du bassin au cours de la période 1991-1998. Les résultats indiquent que les performances du modèle ont pu être améliorées en augmentant le nombre de subdivisions. Cependant, il existe un seuil au-delà duquel aucune amélioration significative n'a pu être obtenue. Nous avons trouvé que les composantes du bilan hydrologique simulé et les contributions au ruissellement des types de sols varient selo...

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“…After a threshold level, any further subdivision produced little change in runoff hydrograph generation. Hayakawa et al (1995) studied the appropriate size of sub-watersheds based on the geomorphology of the channel network and found that the hydrologic response of various sub-watershed sizes was dependent on corresponding changes in topography within the sub-watersheds. Elliot et al (1996) used land-use data to divide an Oklahoma watershed according to eight different resolutions.…”

Section: Introductionmentioning

confidence: 99%

Effect of watershed subdivision on simulation of water balance components

2006

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Abstract:The present effect of watershed subdivision on simulated water balance components using the thoroughly tested Soil and Water Assessment Tool (SWAT) model has been evaluated for the Nagwan watershed in eastern India. Observed meteorological and hydrological data (daily rainfall, temperature, relative humidity and runoff) for the years 1995 to 1998 were collected and used. The watershed and sub-watershed boundaries, slope and soil texture maps were generated using a geographical information system. A supervised classification method was used for land-use/cover classification from satellite imagery of 1996. In order to study the effect of watershed subdivision, the watershed was spatially defined into three decomposition schemes, namely a single watershed, and 12 and 22 sub-watersheds.The simulation using the SWAT model was done for a period of 4 years (1995 to 1998). Results of the study showed a perfect water balance for the Nagwan watershed under all of the decomposition schemes. Results also revealed that the number and size of sub-watersheds do not appreciably affect surface runoff. Except for runoff, there was a marked variation in the individual components of the water balance under the three decomposition schemes. Though the runoff component of the water balance showed negligible variation among the three cases, variations were noticed in the other components: evapotranspiration (5 to 48%), percolation (2 to 26%) and soil water content (0Ð30 to 22%). Thus, based on this study, it is concluded that watershed subdivision has a significant effect on the water balance components.

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A study on subcatchment scale for a distributed runoff model

Cited by 6 publications

References 7 publications

Effect of Watershed Subdivision on Simulation Runoff and Fine Sediment Yield

Effect of Watershed Subdivision on Simulation Runoff and Fine Sediment Yield

Effects of watershed subdivision level on semi-distributed hydrological simulations: case study of the SLURP model applied to the Xiangxi River watershed, China

Effect of watershed subdivision on simulation of water balance components

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