Abstract
Parameters in the lumped sedimentation formula rating curve Qs = KQP are discussed to estimate sedimentation in a basin without calibration in that basin. We were unable to determine the physical meaning of the parameters that are widely used by many researchers. A physically based sediment equation, the Itakura-Kishi equation, prepares a numerical experiment system to discuss rating-curve parameter characteristics. Experimental results suggest a method to estimate K and P parameters from geomorphologic data, particle diameter, riverbed slope, and roughness by changing experimental conditions. The results yield P from the particle diameter and riverbed gradient, and K from the exponential function of the gradient, particle diameter and roughness. Both the proposed rating curve and the Itakura-Kishi methods are applied to the Mekong River basin combining with the BTOP-MC (block-wise TOP model with Muskingum-Cunge routing) model, a distributed hydrologic model, to discuss estimations and their characteristics in practical fields. The proposed methods for K and P provide good agreement with mainstream data from the Mekong River under conditions of gradual water-level variation.
Original language | English |
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Pages (from-to) | 3863-3871 |
Number of pages | 9 |
Journal | Hydrological Processes |
Volume | 19 |
Issue number | 19 |
DOIs | |
Publication status | Published - 2005 Dec 15 |
Keywords
- C-Q rating curve
- Mekong river
- Suspended load
ASJC Scopus subject areas
- Water Science and Technology