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| Titel |
Deriving a global river network map and its sub-grid topographic characteristics from a fine-resolution flow direction map |
| VerfasserIn |
D. Yamazaki, T. Oki, S. Kanae |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 13, no. 11 ; Nr. 13, no. 11 (2009-11-26), S.2241-2251 |
| Datensatznummer |
250012061
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| Publikation (Nr.) |
 copernicus.org/hess-13-2241-2009.pdf |
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| Zusammenfassung |
| This paper proposes an improved method for converting a fine-resolution flow
direction map into a coarse-resolution river network map for use in global
river routing models. The proposed method attempts to preserve the river
network structure of an original fine-resolution map in the upscaling
procedure, as this has not been achieved with previous upscaling methods. We
describe an improved method in which a downstream cell can be flexibly
located on any cell in the river network map. The improved method preserves
the river network structure of the original flow direction map and allows
automated construction of river network maps at any resolution. Automated
construction of a river network map is helpful for attaching sub-grid
topographic information, such as realistic river meanderings and drainage
boundaries, onto the upscaled river network map. The advantages of the
proposed method are expected to enhance the ability of global river routing
models by providing ways to more precisely represent surface water storage
and movement. |
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