TY - JOUR
T1 - Flood hydrograph estimation using an adjoint shallow-water model
AU - Yoshida, Keisuke
AU - Ishikawa, Tadaharu
N1 - Funding Information:
This work was supported in part by JSPS KAKENHI Grant Number 26820203 . The first author thanks Dr. Minoura for his assistance to address the data of the surface flow field from aerial photographic analysis. Valuable comments by anonymous reviewers are also gratefully acknowledged for supporting the improvement of this work.
Publisher Copyright:
© 2014 International Association for Hydro-environment Engineering and Research, Asia Pacific Division.
PY - 2015/9/1
Y1 - 2015/9/1
N2 - This paper describes the estimation of the flood discharge hydrograph for a compound open channel floodplain using data assimilation. The hydrograph was produced iteratively using an adjoint shallow-water model with time-series data of observed water levels. Data assimilation was applied to a flood event that occurred in mid-September 1998 along a 20 km stretch of the lower Tone River in Japan. Both the estimated hydrograph and the flow field simulated using the hydrograph were verified by comparison with the results of aerial photographic analysis. Results show that the hydrograph based on the stage-discharge was overestimated, but it was reasonably corrected by the data assimilation technique used for this study. In addition, the resulting relation during the flood event exhibited a hysteresis loop characteristic, which is typical of compound open channel flows during flooding.
AB - This paper describes the estimation of the flood discharge hydrograph for a compound open channel floodplain using data assimilation. The hydrograph was produced iteratively using an adjoint shallow-water model with time-series data of observed water levels. Data assimilation was applied to a flood event that occurred in mid-September 1998 along a 20 km stretch of the lower Tone River in Japan. Both the estimated hydrograph and the flow field simulated using the hydrograph were verified by comparison with the results of aerial photographic analysis. Results show that the hydrograph based on the stage-discharge was overestimated, but it was reasonably corrected by the data assimilation technique used for this study. In addition, the resulting relation during the flood event exhibited a hysteresis loop characteristic, which is typical of compound open channel flows during flooding.
KW - Adjoint model
KW - Compound open channel
KW - Data assimilation
KW - Discharge estimation
KW - Shallow-water equation
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U2 - 10.1016/j.jher.2014.12.003
DO - 10.1016/j.jher.2014.12.003
M3 - Article
AN - SCOPUS:84940899727
SN - 1570-6443
VL - 9
SP - 429
EP - 440
JO - Journal of Hydro-Environment Research
JF - Journal of Hydro-Environment Research
IS - 3
ER -