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Evaluating LSM-Based Water Budgets Over a West African Basin Assisted with a River Routing SchemeWithin the framework of the African Monsoon Multidisciplinary Analysis (AMMA) Land Surface Model Intercomparison Project phase 2 (ALMIP-2), this study evaluates the water balance simulated by the Interactions between Soil, Biosphere, and Atmosphere (ISBA) over the upper Oum River basin, in Benin, using a mesoscale river routing scheme (RRS). The RRS is based on the nonlinear Muskingum Cunge method coupled with two linear reservoirs that simulate the time delay of both surface runoff and base flow that are produced by land surface models. On the basis of the evidence of a deep water-table recharge in that region,a reservoir representing the deep-water infiltration (DWI) is introduced. The hydrological processes of the basin are simulated for the 2005-08 AMMA field campaign period during which rainfall and stream flow data were intensively collected over the study area. Optimal RRS parameter sets were determined for three optimization experiments that were performed using daily stream flow at five gauges within the basin. Results demonstrate that the RRS simulates stream flow at all gauges with relative errors varying from -22% to 3% and Nash-Sutcliffe coefficients varying from 0.62 to 0.90. DWI varies from 24% to 67% of the base flow as a function of the sub-basin. The relatively simple reservoir DWI approach is quite robust, and further improvements would likely necessitate more complex solutions (e.g., considering seasonality and soil type in ISBA); thus, such modifications are recommended for future studies. Although the evaluation shows that the simulated stream flows are generally satisfactory, further field investigations are necessary to confirm some of the model assumptions.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Getirana, Augusto C. V. (Maryland Univ. Greenbelt, MD, United States)
Boone, Aaron (Centre National de Recherches Meteorologiques Toulouse, France)
Peugeot, Christophe (Montpellier Univ. France)
Date Acquired
June 6, 2017
Publication Date
December 2, 2014
Publication Information
Publication: Journal of Hydrometeorology
Volume: 15
Issue: 6
ISSN: 1525-755X
Subject Category
Numerical Analysis
Meteorology and Climatology
Report/Patent Number
Funding Number(s)
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