Biography:

In the past Tomoya Shibayama has collaborated on articles with Le Van Cong and Takahito Mikami. One of their most recent publications is 4 - Assessment of Vietnam Coastal Erosion and Relevant Laws and Policies. Which was published in journal .

More information about Tomoya Shibayama research including statistics on their citations can be found on their Copernicus Academic profile page.

Tomoya Shibayama's Articles: (7)

4 - Assessment of Vietnam Coastal Erosion and Relevant Laws and Policies

The main purpose of this chapter is to provide an assessment of the coastal erosion situation in Vietnam, covering its present status of erosion at the national and the subnational levels. Erosion can be caused by a number of factors, including the impacts of sea level rise (SLR). Relevant laws and policies for addressing coastal erosion, various types of measures for coastal erosion, gaps and needs to address coastal erosion in terms of national policies, and legal and institutional arrangements to address coastal erosion are also given.

Preface

No abstract

Chapter 2 - 2005 Storm Surge by Hurricane Katrina

AbstractHurricane Katrina attacked the United States in 2005, causing particularly catastrophic damage to the city of New Orleans and the coast of Louisiana and Alabama states. The storm surge generated by the hurricane caused over 1,800 casualties and huge economic damage, flooding large areas of New Orleans and adjacent cities. The author of the chapter led a team of researchers in a field survey that attempted to draw lessons from the disaster in order to improve storm surge protection in other locations around the world. Three general characteristics of the disaster could be ascertained through these field surveys: (1) The disaster affected a large area and required long distance evacuation, which involved people crossing state boundaries, sometimes by a distance of 300 km or more, 2) it was a high magnitude disaster which stopped the functioning of New Orleans for a long time; (3) the consequences of the disaster continued for a long period of time, during which many of the affected could not return to their original places of residence. However, the disaster patterns experienced by residents were different from place to place. After a variety of damage types were analyzed in different areas the author concludes that it appears to be necessary that disaster prevention plans for tropical cyclone hazard areas are based on multifarious conditions, including local topography and the level of preparedness and awareness of residents in a given region.

Chapter 5 - Tsunami Disasters in Remote Islands: 2009 Samoan and 2010 Mentawai Islands Tsunamis

AbstractIn recent years, many tsunami disasters have taken place in small remote islands, which can be considered to be particularly vulnerable against coastal disasters. In this chapter the authors discuss how to prepare for future tsunami threats in remote islands based on the results of their own field surveys conducted after two recent tsunami events. First, the results of the surveys on the 2009 Samoan and 2010 Mentawai islands tsunamis are summarized, providing the measured tsunami heights at a variety of locations. Then, the lessons learnt from the Samoan and Mentawai islands cases are described from two points of view: triggers for evacuation actions and evacuation routes and areas. Ground shaking due to an earthquake, information through a tsunami warning system, and unusual behavior of the sea are typical triggers for tsunami evacuation actions and it is important to increase the number and types of triggers. Preparing evacuation routes and signs, which can help people evacuate to higher ground quickly, are also important countermeasures against tsunamis in remote islands.

Chapter 33 - Adaptation to Sea Level Rise in Tokyo Bay: Opportunities for a Storm Surge Barrier?

AbstractThe combined effect of an increase in typhoon intensity and sea level rise could pose significant challenges to coastal defences around Tokyo Bay. In the present chapter the authors determined the storm surge that could result from an increase in typhoon intensity around Tokyo Bay around the turn of the twenty-first century. This was then combined with a variety of sea level rise scenarios to obtain potential water levels for a 1 in 100 year design storm in the year 2100. The results show that the various settlements around Tokyo Bay, and particularly those along the low-lying areas in the Koto delta in Tokyo, are at considerable risk of storm surges and sea level rise in the future. If these defences are breached the potential direct economic consequences would be significant, potentially in excess of 100 trillion yen (around 0.92 trillion USD or 0.72 trillion euros, or 20% of the current GDP of Japan), with the indirect costs likely to be even greater. As a result it is likely that sea defences will have to be strengthened around Tokyo Bay in the future, which could cost in the order of 370 bn yen to defend against a 1 in 100 year storm by the year 2100. Alternatively, a storm surge barrier could be built, which would cost in the range of 700-800 bn yen, though such a structure could raise the protection level and cope with a 1 in 500 year storm, amongst other benefits.

A two-dimensional horizontal wave propagation and mud mass transport model

AbstractThe present study offers a two-dimensional horizontal wave propagation and morphodynamic model for muddy coasts. The model can be applied on a general three-dimensional bathymetry of a soft muddy coast to calculate wave damping, fluid mud mass transport and resulting bathymetry change under wave actions. The wave propagation model is based on time-dependent mild slope equations including the wave energy dissipation due to the wave-mud interaction of bottom mud layers as well as the combined effects of the wave refraction, diffraction and breaking. The constitutive equations of the visco-elastic–plastic model are adopted for the rheological behavior of fluid mud. The mass transport velocity within the fluid mud layer is calculated combining the Stokes’ drift, the mean Eulerian velocity and the gravity-driven mud flow. The results of the numerical model are compared against a series of conducted wave basin experiments, wave flume experiments and field observations. Comparisons between the computed results with both the field and laboratory data reveal the capability of the proposed model to predict the wave transformation and mud mass transport.

Evaluation of Storm Surge Caused by Typhoon Yolanda (2013) and Using Weather - Storm Surge - Wave - Tide Model☆

AbstractThis paper presents a comparison between numerically estimated storm surge invoked by typhoon Yolanda (2013) and field survey results. In order to estimate the typhoon more accurately, TC-Bogus scheme is used in typhoon simulation. This scheme has a potential to improve an initial atmospheric field and give a better results, in terms of routes and minimum sea surface pressure of the typhoon. In the results of calculated storm surge, a height of the estimated storm surge reached approximately 5.0 m at Tacloban. This value is a good agreement with the measured height. The timing of the storm surge was 00:00 UTC 8th November 2013. The estimated time of the storm surge invoked by Yolanda is almost the same with that of information from residents. Thus, the storm surge model composed of the WRF, FVCOM, SWAN and WX-tide has a potential to reproduce the storm surge realistically.

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