PREDICTIVE MODEL OF THREE-DIMENSIONAL DEVELOPMENT AND DEFORMATION OF A RIVER MOUTH DELTA BY APPLYING CONTOUR LINE CHANGE MODEL

Takaaki Uda, Hiroshi Yamagata, Ken-ichi Katoh, Naohiro Akamatsu

Abstract


A predictive model of the three-dimensional development and deformation of a river mouth delta is developed. This model enables the prediction of not only the shoreline change but also the three-dimensional, long-term topographic changes around a river mouth, and offshore sand transport can be taken into account when the sea bottom slope exceeds a critical value given by the angle of repose of sand. Numerical simulation of three cases of initial beach slopes is carried out and compared. The calculated and actual beach changes measured around the Fuji and Tenryu River mouths are compared. It is concluded that calculated results can reproduce real phenomena measured around river mouths qualitatively.

Keywords


predictive model; 3D deformation; river mouth; river delta; contour line change model

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