This study describes the deformation and resonance of solitary waves in coastal areas and along a river. When tsunamis propagate into shallow water regions, they may deform into a train of solitary waves due to the nonlinear shallow water deformation. Also, the change in the river width is expected to cause resonance of solitary waves along the oblique riverbank. This study thus aims to investigate the deformation of solitary waves in a shallow water region around a coast and the resonance due to the oblique boundary in a river. As a result, it is found that solitary waves can be reproduced by using the 3rd order theoretical solutions even when they progress over a mild uniform slope. Also, the amplification of amplitude of solitary waves is revealed to be larger than the Mile's solutions when they approach to an oblique boundary.
The variation characteristics of tidal current and water quality in Hakodate port are investigated through field observation and numerical modeling. Measurements of nutrients, dissolved oxygen, chemical oxygen demand and turbidity are obtained from the whole area of the port. The results show that, during falling tide, the sediments suspension lead to increasing of chemical oxygen demand concentration. This phenomenon is made oxygen consumption speed to accelerate near the seabed. The phosphorus accumulated into the port is supplied from one of the rivers flowing out to Hakodate bay. The daily variation of water quality in the port is estimated using the multi-level model concerned with the ecological system. The results of prediction are in good qualitative agreement with those of observation.
正会員 博(工) 北見工業大学工学部 社会環境工学科(〒090-8507 北海道北見市公園町165番地)2 正会員 修(工) (株) アルファ水工コンサルタンツ (〒063-0829 北海道札幌市西区発寒9条14丁目516-336)This study describes the development of a three-layer model based on a fully-nonlinear and strongly-dispersive internal wave model and its application to a stratified lake response. The efficient numerical model for three-layer system is needed to analyze non-linear and non-hydrostatic lake response as a two-layer model often fails to illustrate realistic stratified lake responses. Therefore, this study aims to develop a three-layer model based on the fully-nonlinear and strongly-dispersive internal wave model (the three-layer FSI model). The three-layer FSI model was verified by simulating the belt-driven three-layer laboratory experiments by Stevens & Imberger (1996). The present model well predicts the measured results of the experiments and supports the classification by the Wedderburn number and Csanady's theory. The computed results also show the importance of non-hydrostatic pressure on the generation of the internal solitary wave during upwelling process.
To analyze the influence of vorticity on surface and internal waves, Kakinuma and Nakayama (2007) proposed a fullynonlinear strongly-dispersive internal wave equation by taking into acount vorticity effects (FSI model). In this study, we made an attempt to apply the FSI model to reproduce the trochoidal waves in order to investigate the reliability of the FSI model in flow fields with vorticity. As a result, we obatained good agreement between the FSI model and the theoretical solutions. Furthermore, we applied the FSI model into solitary waves with positive vorticity, which results in the supression of wave celerity and wave height.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.