Risk Evaluation and Disaster Mitigation Research Division
Disaster Geo-informatics Lab
Research Subject(s)
Coastal erosion caused by artificial developments and natural hazards is a serious problem all over the world. In future, sea level rise and extreme events due to climate change are expected to accelerate the erosion. My study focuses on disaster reduction by developing methodologies to estimate the erosion and to preserve coastal areas.
Key Words
Sediment transport / Sediment yield / Beach erosion / Climate change / Economic evaluation
Research Activities

Distributions of downward crustal deformation, tsunami watermark height and seawall height, and shoreline retreat due to the earthquake and tsunami in 2011. Significant beach shoreline retreats of several hundred meters, especially in the vicinity of river mouths and seawall breaches, extended over a wide area from Iwate Prefecture to Fukushima Prefecture, causing serious problems in the reconstruction process.

Curve of national beach loss rate in Japan due to the sea level rise and future map of beach loss rate for sea level rise of 0.6 m. The rate is estimated to be 47% for the sea level rise of 0.26 m (the minimum value of global average sea level rise at the end of 21st century; IPCC, 2013) and 91% for the sea level rise of 0.82 m (the maximum value of the sea level rise). Beaches are important for disaster mitigation, ecosystem conservation, and tourism. Climate change is expected to cause serious impact on coastal areas.

Selected Works

Udo, K., R. Ranasinghe, and Y. Takeda (2020) An assessment of measured and computed depth of closure around Japan, Scientific Reports, 10, 2987.

Sharaan, M. and K. Udo (2020). Projections of future beach loss along the mediterranean coastline of Egypt due to sea-level rise, Applied Ocean Research, 94, 101972.

Udo, K. and Y. Takeda (2017). Projections of future beach loss in Japan due to sea-level rise and uncertainties in projected beach loss, Coastal Engineering Journal, 59, 1740006.

Udo, K., D. Sugawara, H. Tanaka, K. Imai, and A. Mano (2012). Impact of the 2011 Tohoku Earthquake and Tsunami on beach morphology along the Northern Sendai Coast, Coastal Engineering Journal, 54, 1250009.

Udo, K., Y. Kuriyama, and D.W.T. Jackson (2008). Observations of wind-blown sand under various meteorological conditions at a beach, Journal of Geophysical Research, 113, F04008, doi 10.1029/2007JF000936.

Selected Memberships
  • Japan Society of Civil Engineers
Selected Awards
  • Japan Federation of Ocean Engineering Societies, JAMSTEC Nakanishi Award 2019
  • Coastal Engineering Journal Award 2017 (Annual Best Paper Award 2017)
  • Intelligent Cosmos Academic Foundation, The 14th Intelligent Cosmos Incentive Award 2015