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Japan - Korea Seminar on Coastal Disasters in Urban Areas

Date: January 28, 2010
Venue: Seminar Room 1, Oubaku Plaza, Uji Campus, Kyoto University, Japan

Organized by:
- Disaster Risk Management Group (DPRI)
- Kyoto University Global COE Program "Global Center for Education and Research on Human Security Engineering for Asian Megacities"

Number of attendants: 8

Report 080


Recently, in coastal areas in Asian megacities, severe erosions frequently occur due to heavy rainfall and typhoons, and their overlap by climate change and associated extreme weather may lead the situation more serious. How to make countermeasures against coastal erosions is one of the most important tasks from the viewpoint of disaster prevention and reduction.
In this seminar, several recent studies related to coastal disasters in Japan and Korea are introduced, and their prediction methods and suitable countermeasures are also discussed.


In the seminar, three presenters were invited, two from Korean side, Prof. LEE and Prof. PARK, and one from Japanese side, Dr. WATANABE.
Prof. LEE delivered his presentation under the title of “Effects of wind stress on tidal currents in coastal waters”, He introduced his meteorological and oceanographic measurements results in the field in order to study the mechanisms of coastal erosion on Haeundae beach, and pointed out the importance of taking the effect of wind characteristics into account in tidal currents generation. He also pointed out that wind data on the land cannot be used to estimate its effect on the currents, thus it is important for the purpose to equip the wind stations on the sea.
Prof. PARK delivered his presentation under the title of “Shoreline changes near the coastal structures at the east coast of Korea”. He showed current situations of habour siltation in the East coast of Korea, then pointed out that a reasonable prediction of longshore sediment rate is important to approach the problem. In addition, he introduced his simulation model developed for the problem, so-called 1-line model, and discussed estimated sediment transport rates in two field sites and effects of structures such as fisheries ports and nuclear power plants obtained from his model.
Dr. WATANABE made the presentation on “An Estimation Method of Water Depth at River Mouths and its Applicability”. The main issue of his presentation was a newly developed method to measure bed bathymetry in river mouths. His model is based on a simple energy equation utilizing stage data obtained river mouths. He applied his model to several Japanese river mouths, and discussed its applicability and criteria using two dimensionless parameters.
We had a very fruitful discussion time after each presentation. Graduate students mainly from Korea studying at DPRI also joined the seminar. They seem very impressed with the recent researches on coastal erosion and sedimentation.