A computer graphic system of wind wave and tsunami propagation in coastal area is newly developed. The main characteristics of the system are the removability of location and height of view point, the wide view angle with five screens each 70inch wide, and the real time expression. The virtual images for simulated high waves in a port and the invasion of 1946 Nankai Earthquake Tsunami are demonstrated.
1. INTRODUCTION
Computer graphic is widely applied to present the results from numerical simulation. It becomes one of the most effective methods to make a design of landscape. Wind wave transformation and tsunami propagation simulated in the numerical models is widely expressed in the computer graphics. Some effective graphics to show the attack of the 1993 Hokkaido Nansei-oki Earthquake Tsunami were presented in the 41st Conference of Japanese Coastal Engineering (1994). The computer graphics is effective to design of the coastal disaster prevention facilities like breakwaters and sea walls. It is also useful to planning of the refuge route and alarm system.
The view point in the computer graphics is, however, usualy fixed to a single point. The bird's eye view system is normally employed to determine the view point. It is important to get the total information like the arrival time of tsunami wave and the distribution of the tsunami runup or wave heights. However, the expression from the human's view point is necessary to make the refuge planning and to establish the alarm system. It is also very important to give an visual alarm to the local residents. The virtual observershould take any position and move to any space to get the detail information of wave transformation and tsunami attack. Therefore, a new computer graphics technic has to be developed for the human conscious prevention.
Meanwhile, a ship maneuvering simulator system has been developed in some research institutes(Hayafuji,1990). The ship maneuvering simulator system is for the discipline of vessel navigation in a port. An examiner can get a virtual scene around his vessel according to his position in the port. When he advances the vessel forward, the imaginary scene on the screen may be gradually changed. The Port and Harbour Research Institute has developed a navigation simulator with five wide screen each 7Oinch wide. An examiner is able to get a virtual reality image with port facilities.
This paper describes a newly developed computer graphics system for wave transformation in a port and tsunami propagation in coastal area The ship maneuvering simulator is applied to express the simulation results. The virtual reality images of large waves and tsunami attack are observed in the system.
