Journal
ADVANCES IN WATER RESOURCES
Volume 159, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.advwatres.2021.104093
Keywords
Uncertainty; Constraints; Modeling; Pitman model; Congo Basin
Categories
Funding
- Congo River user Hydraulics and Morphology (CRuHM) project - Royal Society-DFID Africa Capacity Building (RS-DFID) [AQ150005]
- Royal Society Wolfson research Merit award
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The regional characteristics of a sub-basin's long-term hydrological behavior are used as constraints to improve hydrological model simulations in the Congo Basin. Implementation of an adjustment factor based on slope can improve poor results, and the percentage of simulated data falling within the uncertainty range has increased.
The regionalised characteristics of a sub-basin's long-term hydrological behaviour are used as multiple constraint filters for constraining hydrological model simulations in the Congo Basin using the monthly time step Pitman model. The results suggest that the constraints are appropriate in many sub-basins (>= 20 gauging stations), but not all. Detailed examination of these results suggested that the effects of high slopes (> 7%) could increase the runoff ratio and Q90/MMQ (low flow index) constraint values and that implementing an adjustment factor based on slope did improve some of the very poor results. The percentage points on the FDC falling within the simulated uncertainty band has increased from 0% to 59.6% and 2.4% to 39.9% for the Rift valley and Bateke plateaux regions, respectively. Future studies ideally need a range of different rainfall products to quantify the uncertainties related to the inappropriateness of the CRU rainfall data in some parts of the Congo Basin.
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