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| Titel |
Formulation of parameters in the storage-discharge relation for floods in three mountainous basins in Japan |
| VerfasserIn |
Kazumasa Fujimura, Yoshihiko Iseri, Thomas Kjeldsen, Shoji Okada, Shinjiro Kanae, Masahiro Murakami |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250139793
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| Publikation (Nr.) |
 EGU/EGU2017-3100.pdf |
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| Zusammenfassung |
| While the storage-discharge relation of the type S=aQb have been widely used as the basic
equation in many flood runoff models, the optimum parameters, the coefficient a and
exponent b, are different in each flood event, and their features are still not fully understood.
Reducing the uncertainty of parameters in the storage-discharge relation can contribute to the
accurate quantitative estimation of runoff. Here we present a formulation of the optimum
parameters, a and b, by performing calibrations, which are carried out for 10,000 simulations
of each flood event while changing the values of the parameters using a double-loop
algorithm. The study basins are three mountainous basins located in different regions of
Japan with different topographical, geological, and climatological conditions. The basin areas
are from 233km2 to 472km2 and a total of 61 flood events are selected from hourly data
over 15 years for the three basins. The hydrological model used in this study is a
combination of the storage-discharge function and the Diskin–Nazimov rainfall infiltration
model.
The results show that the optimum combination of parameters, a and b, in the
storage-discharge relation for floods in each study basin are approximated by a power-law
function and form a non-linear curve in a log-log graph; the values of the coefficient of
determination of the power-law function of the three study basins are 0.42, 0.74 and 0.84,
respectively. |
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