IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 4 - HYDRO-ENVIRONMENT : Inverse Estimation of Flow Resistance of Vegetation in the Asahi River during a Flood
Inverse Estimation of Flow Resistance of Vegetation in the Asahi River during a Flood
Author : Keisuke Yoshida and Shiro Maeno
This paper describes a data assimilation technique for identifying flow resistance or the bed roughness factor because of vegetation establishment in river floodplains. A shallow-water model was used as the constraint condition for a variational approach of data assimilation, which enables us to develop the adjoint shallow model. The optimal value of the bed roughness coefficient was determined using a quasi-Newton method with adjoint variables. The technique was applied to the inverse estimation of the bed roughness coefficient because of lush vegetation established on floodplains in the Asahi River, Japan during a flooding event. Results showed that the coefficient is reasonably identified, compared with the observation data, even if the iterative estimation of data assimilation starts with an initial guess quite different from the optimal value.
File Size : 644,931 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 18/07/2016
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