Publication: Grid size effects on a distributed water quantity-quality model in a hilly watershed
Issued Date
2008-12-29
Resource Type
ISSN
02731223
Other identifier(s)
2-s2.0-57849119710
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Mahidol University
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SCOPUS
Bibliographic Citation
Water Science and Technology. Vol.58, No.9 (2008), 1829-1836
Suggested Citation
Binaya Raj Shivakoti, Shigeo Fujii, Suwanna Kitpati Boontanon, Hirotaka Ihara, Masashi Moriya, Shuhei Tanaka Grid size effects on a distributed water quantity-quality model in a hilly watershed. Water Science and Technology. Vol.58, No.9 (2008), 1829-1836. doi:10.2166/wst.2008.566 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/19221
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Title
Grid size effects on a distributed water quantity-quality model in a hilly watershed
Abstract
Effects of different grid sizes (50 m, 100 m, 150 m, ... , 500 m) were analyzed for both watershed attributes and estimation by a distributed model for flow rate and water quality. Model was evaluated in terms of estimation differences and on the values of some parameters at different grid sizes. Grid resizing showed significant changes in the physical attributes related with topography, but attributes such as land cover and geology were not much affected. Model showed increasing flow rates estimation with increasing grid size when the same parameter values were used. Such increasing pattern was observed for root mean square error, magnitude of peak runoff points, and time for the peak recession. Observed differences did not show such variation patterns in case of water quality estimation at different grid sizes. The observed differences in the estimated value by the model could have been derived mainly from less number of grids required to travel, increased proportion of channel grids and smaller outlet height at coarser grid sizes. These estimated differences could be adjusted by changing values of some of the model parameters for each grid size within a narrow range. © IWA Publishing 2008.