Author(s): Yasuhiro Murakami; Kohji Hohjo; Yasuyuki Shimizu

Linked Author(s): Yasuyuki Shimizu

Keywords: No Keywords

Abstract: It is very important to investigate the propagation of Tsunami in reservoirs, lakes or narrow bays from the view point of disaster pre­vention works. Tsunami is caused by a lot of natural phenomena such as wind, earthquake, tide, volcanic eruption and so on. The large-scale landslide or ice avalanche can also be a source for the Tsunami. Cracks of centrifugal circles were remained on the ice surface of the Jozankei dam reservoir in 1990 which suggested the occurrence of Tsunami caused by a falling mass materials. In order to investigate the behavior of sur­face wave in the Jozankei dam reservoir, a physical model study was performed using a rectangular pond. An object likened to the land­slide was plunged into the water from one side of the pond, and the time variation of the water surface elevation was measured by capacitytype wave gages at several points. A wide range of wave spectra were observed in the recorded water surface waves. A one dimensional numerical model was introduced to predict the behavior of the surface wave in the actual reservoir, in which the wave spectrum characteristic of observed waves in the physical model \vere taken into account. The numerical model was solved using a finite difference method, and the results were compared with the experiment. Good agreements were found between calculated results and observed ones.

DOI:

Year: 1992