INTERACTION AND DEFORMATION OF SOLITARY WAVES AROUND CHANNEL JUNCTION

Title:

INTERACTION AND DEFORMATION OF SOLITARY WAVES AROUND CHANNEL JUNCTION

DOI No:

10.1142/9789812701916_0017

Source:

COASTAL ENGINEERING 2004 (pp 230-242)

Author(s):

MASATOSHI YUHI
Division of Environmental Science and Engineering, Graduate School of Natural Science and Technology, Kanazawa University, 2-40-20 Kodatsuno, Kanazawa, 920-8667, Japan
HAJIME MASE
Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, 611-0011, Japan
HAJIME ISHIDA
Division of Environmental Science and Engineering, Graduate School of Natural Science and Technology, Kanazawa University, 2-40-20 Kodatsuno, Kanazawa, 920-8667, Japan

Abstract:

The interaction and deformation of solitary waves around channel junctions are investigated numerically and experimentally for branching channels of basic shape. The weakly non-linear and weakly dispersive extended Boussinesq equations are solved in a generalized curvilinear coordinate system by using a high-order finite difference method. In order to verify the high accuracy of the numerical scheme, a laboratory experiment is conducted and the experimental results are compared with numerical ones. The numerical predictions agree very well with the experimental measurements for the time variation of the surface elevation at various locations as well as the maximum crest elevation along the wall. A series of computations is then carried out systematically for a y-shaped branching channel. The general features of the deformation and interaction of solitary waves near the junction are described, and the effects of the channel geometry on the maximum crest elevation are examined. The numerical results show that the influence of the channel geometry is significant and that the maximum crest elevation becomes more than three times as large as the incident wave amplitude.

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