To clarify sediment transport and qualities of sediment in rivers flowing into Tokyo Bay, we performed field measurements and numerical simulation for suspended-and bed-load transports and sediment qualities in the influent rivers. Particle size and ignition loss (IL) of sediment in several influent rivers were found to be similar to those in coastal area. Bed-load transport of coarse and fine sands, which are found in sediments of tidal flat, were larger than the corresponding suspended-load transport, indicating the importance of the bed-load transport for the sediment supply to tidal flat. It is also found that one third of the total sediment yield in the whole basin of Tokyo Bay was trapped in dams located in the basin.
A new scheme of numerical simulation of storm surge inundation has been developed. With this simulation model, abnormal high storm surges generated by typhoon5915 around the coasts of Ise Bay were well reproduced. Inundation simulation method induced by overflow, overtopping and dike breach is incorporated into this model. Furthermore, the storm surge level and inundation area is simulated under the several conditions about storm surge, which are based on the future disaster risks. The inundation map combined with the GIS can be designed. Using the results of this inundation simulation, estimation of protection level and risk analysis of storm surge disaster at the Nagoya Port are performed. The information of this paper is used for the planning of hard and soft countermeasures in the Port.
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