Open AccessSimultaneous estimation of inflow and channel roughness using 2D hydraulic model and particle filters
Author(s) -
Kim Y.,
Tachikawa Y.,
Shiiba M.,
Kim S.,
Yorozu K.,
Noh S.J.
Publication year - 2013
Publication title -
journal of flood risk management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.049
H-Index - 36
ISSN - 1753-318X
DOI - 10.1111/j.1753-318x.2012.01164.x
Subject(s) - inflow , mathematics , environmental science , mechanics , physics
Abstract The S equential I mportance R esampling method is introduced to a two dimensional hydraulic model to estimate inflow and M anning roughness coefficient ( M anning's n) simultaneously. The equifinality problem between the M anning's n and the inflow is considered using the proposed method. To solve the problem, we introduce the variance reduction factor and the correction factor in the perturbation step of the proposed method. The perturbed inflow and M anning's n were updated according to the observed water stage with state variables. The result of the proposed method shows good agreement with the observed discharge, which enabled us to estimate the M anning's n and inflow discharge at the same time considering the uncertainties of the existing rating curve. Finally, it showed that the methodology not only estimates the appropriate M anning's n but also improves the existing rating curve.