2004 Fiscal Year Final Research Report Summary

A quasi-3D numerical modeling of beach scarp generation due to longshore sediment transport mechanism.

Research Project

Project/Area Number	14550514
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	水工水理学
Research Institution	Kagoshima University
Principal Investigator	NISHI Ryuichiro Kagoshima Univ., Faculty of Engineering, Associate Professor, 工学部, 助教授 (30189253)
Project Period (FY)	2002 – 2004
Keywords	Beach and dune scarp / shoreline change / beach erosion / filed study / numerical simulation / shore protection works
Research Abstract	Beach and dune scarps can be seen often after a typhoon, hurricane and northeaster. In general, beach scarp and resulted shoreline recession are computed using a cross-shore sediment transport model in EU countries and US. On the other hand, beach scarp due to longshore sediment transport mechanics has been often estimated using N-line model in Japan. There is still unknown factor to distinguish which process is dominant to cause beach and dune scarp in natural condition. Here, field studies were conducted after typhoons and evidence to proof that at least longshore process could cause beach scarp in sandy beach. Then, a quasi 3-D model to simulate a beach scarp generation is developed based on longshore sediment transport calculation and resulted shoreline position. The new concept is applied to an idealized bathymetry condition.

(2 results)