Review of Geologic Data Sources for Coastal Sediment Budgets

摘要

Sediment budget studies are of great importance in many coastal engineeringprojects. In general, a sediment budget is a compilation of the sources and amounts of sediment that are gained or lost in designated coastal reaches during a specific interval of time. Sediment supply for a given coastal area may be derived from several sources and may involve different means of transport. The analysis of sediment budgets includes the study of: the influence of waves on alongshore and onshore-offshore sediment movement; the effects of tidal and other coastal currents on sediment movement; sediment accretion rates at barriers and traps; historical shoreline changes; and long-term measurements of littoral profiles. Sediment sources and transport paths must be identified as part of the sediment budget process. In many cases, important sources are apparent from observation of the geomorphic aspects of the coastal terrain. Often, sources are obscure and study of much more complex aspects of the sediment, such as particle composition and shape characteristics, is needed. In many cases, existing methods are not sufficient for positive identification of all sources. Techniques for source identification and quantitative accounting of sediment supply and loss are important areas of continued research efforts to improve the methodology....Fourier shape analysis, Sediment budgets, Geologic data sources, Shoreline change, Littoral drift, Wave Information Studies (WIS).