Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 41, Issue 9, Pages 3127-3135Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL059744
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Funding
- JSPS Postdoctoral Fellowship for Research Abroad from Japan Society for Promotion of Science (JSPS)
- JSPS [23226012]
- Grants-in-Aid for Scientific Research [23226012] Funding Source: KAKEN
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In this paper we show the importance of bifurcation channels for flow in river mega deltas through the use of a new computational scheme implemented in the global hydrodynamic model, CaMa-Flood (Catchment-based Macro-scale Floodplain model). First, we developed a new river network map based on SRTM3 DEM (Shuttle Radar Topography Mission 3 arc-second Digital Elevation Model) and HydroSHEDS (hydrological data and maps based on shuttle elevation derivatives at multiple scales) which includes bifurcation channels. Next, we implemented a new bifurcation scheme in CaMa-Flood capable of routing flow along this network and used the model to simulate the Mekong River. We show that in the Mekong delta such channels route about 50% of total flow and that their representation is essential for realistic hydrodynamic simulations. A simulation without bifurcation channels was obviously unrealistic because no flow occurred between the mainstem and adjacent channels even when their water level difference was >6 m. The bifurcation channels are extracted from globally available data sets; thus, it is straightforward to expand the proposed scheme to global-scale studies.
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