Overtopping Wave Monitoring System
Some of the sections on the national highways managed by the Hokkaido
Development Bureau are often subject to traffic regulation due to high
waves. Not only overtopping waves, but also seaborne stones and sand dumped
on the road surface threaten the safety of vehicles traveling on the National
Highway No. 336 which runs through the Araiso District of Urakawa-cho.
The Overtopping Wave Monitoring System was therefore experimentally introduced
in January 1995.
After detecting the overtopping of waves, the image processing sensor
of the surveillance camera installed at the observation point sends static
images to the still picture transmitter in the form of electrical signals.
The static images are then transmitted via an analog telephone circuit
to the still picture transmitter in the road management office, and displayed
on the monitor.
The images provided by the system allow the frequency and scale of overtopping
waves to be monitored in real time, and are used to make a decision on
traffic closure.
(Civil Engineering Research Institute, Hokkaido Development Bureau)
Images transmitted from the observation point
Outline of the system
ITS HANDBOOK 2000-2001iNov 2000j