Journal cover Journal topic
Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/hessd-12-6755-2015
© Author(s) 2015. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
16 Jul 2015
Review status
This discussion paper has been under review for the journal Hydrology and Earth System Sciences (HESS). The manuscript was not accepted for further review after discussion.
Distributed model of hydrological and sediment transport processes in large river basins in Southeast Asia
S. Zuliziana1,2, K. Tanuma1, C. Yoshimura1, and O. C. Saavedra1 1Department of Civil Engineering, Tokyo Institute of Technology, 2-12-1-M1-4 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
2Department of Civil Engineering, Faculty of Engineering, National Defense University of Malaysia, Sungai Besi Camp, 57000 Kuala Lumpur, Malaysia
Abstract. Soil erosion and sediment transport have been modeled at several spatial and temporal scales, yet few models have been reported for large river basins (e.g., drainage areas > 100 000 km2). In this study, we propose a process-based distributed model for assessment of sediment transport at a large basin scale. A distributed hydrological model was coupled with a process-based distributed sediment transport model describing soil erosion and sedimentary processes at hillslope units and channels. The model was tested on two large river basins: the Chao Phraya River Basin (drainage area: 160 000 km2) and the Mekong River Basin (795 000 km2). The simulation over 10 years showed good agreement with the observed suspended sediment load in both basins. The average Nash–Sutcliffe efficiency (NSE) and average correlation coefficient (r) between the simulated and observed suspended sediment loads were 0.62 and 0.61, respectively, in the Chao Phraya River Basin except the lowland section. In the Mekong River Basin, the overall average NSE and r were 0.60 and 0.78, respectively. Sensitivity analysis indicated that suspended sediment load is sensitive to detachability by raindrop (k) in the Chao Phraya River Basin and to soil detachability over land (Kf) in the Mekong River Basin. Overall, the results suggest that the present model can be used to understand and simulate erosion and sediment transport in large river basins.

Citation: Zuliziana, S., Tanuma, K., Yoshimura, C., and Saavedra, O. C.: Distributed model of hydrological and sediment transport processes in large river basins in Southeast Asia, Hydrol. Earth Syst. Sci. Discuss., 12, 6755-6797, doi:10.5194/hessd-12-6755-2015, 2015.
S. Zuliziana et al.
S. Zuliziana et al.
S. Zuliziana et al.

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Short summary
The uniqueness of this sediment model is the ability to simulate the sediment transport processes separately on hillslope and in river channel in each grid within a large river basin. The sub-model of river channel is able to simulate deposition and detachment using relevant physical equations. This model can identify the locations of severe sediment dynamics occurred by a fine grid scale and can output spatial distribution of soil erosion sediment transport and deposition in entire river basin.
The uniqueness of this sediment model is the ability to simulate the sediment transport...
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