Department of Civil and Environmental Engineering, Waseda University

Coastal Engineering & Management Lab.

Research Topics

Protection of lives and property against natural disasters in coastal areas

Coastal zones are easily exposed to disasters such as tsunamis and storm surges. Especially in Japan, it is necessary to prepare for storm surge disasters, since typhoons reach coastal areas as frequently as 20~30 times in a year. Furthermore, these typhoons and low pressure systems have the potential to invoke huge ocean waves which result in coastal erosion. In order to reduce disaster caused damage to human lives and property, it is important for coastal engineers not only to verify mechanisms of these disasters, but also to propose countermeasures. We have experience in deriving countermeasures by observations of and information on coastal areas, conducting experiments in wave basin and applying numerical calculations in supercomputer.

Prediction and evaluation of estuarine and coastal marine environments

Historically the inner parts of bays have been the source of beneficial products. However, economic growth and infrastructure development in these areas have caused water pollution in the local environment. Most frequent concerns being eutrophication, toxic chemicals and heavy metals. In the case of Tokyo bay, these concerns result in loss of potential product utilization. Reflecting on the current situation, we must reconsider conventional developments and rethink where we are heading in order to realize sustainable society for ourselves and for future generations. By applying and developing our skills in numerical simulations and observations, we are getting closer to that future.

Restoration and rehabilitation of seagrass beds

The number of seaweed beds, lagoons and coral reefs have recently diminished due to port construction and reclaimed land. Particularly, the seaweed bed area has decreased by 64,000,000 m2 (3% of the entire area). We need to restore and and prevent further damage to these ocean plants. We have investigated environmental conditions under which seaweed is able to grow healthy by using information gathered from diving observations, experiments and numerical simulations.

Enhanced construction management and environmental systems based on construction sociology

The postmodern engineers are considered to require not only understanding disaster prevention and environmental protection, but also to show cooperative nature in regards to other experts, residents and hold high ethical standards. In addition, we need to consider the construction of societies system when making policy proposals for other countries. Construction framework was adopted when these countries were advised on how to cope in modern society and solutions to combat environmental issues.

Research Environment

In our laboratory, every student must conduct their own research. Indivisual consultation with professors is once a week and presentation in English on research progress ("Progress Report") is once a month. These activities are to aid us in advancing our research.

The laboratory is located in Building 51 on the 16th floor. Room to right hand is Prof. Shibayama's room. Room to left hand is students' room. Students' room has desks, computers, books, and journals to facilitate our research. Also students receive lot of opinions, knowledge and constructive feedback from professors!

Students advance research by conducting numerical simulation, GIS analysis, hydraulic experiments, and field surveys. There are two experimental facilities in our campus: wave flume (Building 58) and wave basin (located between Buildings 54 and 55).

Experimental Facilities

Wave flume is located in Building 58 on the 1st floor. The flume is 12 m long, 40 cm wide, and 60 cm high and equipped with wave generator (able to generate regular, irregular, and solitary waves) and current generator. Experiments have been conducted on the behavior of caissons and armour units of breakwaters and sand transport under waves.

Wave basin is located between Buildings 54 and 55. The basin is 9 m long, 4 m wide, and 50 cm high and equipped with long wave generator. Experiments have been conducted on the behavior of floating debris due to tsunami and the effect of detached breakwaters and canals on tsunamis.