Integration of bed characteristics, geochemical tracers, current measurements, and numerical modeling for assessing the provenance of beach sand in the San Francisco Bay Coastal System

作者: Patrick L. Barnard , Amy C. Foxgrover , Edwin P.L. Elias , Li H. Erikson , James R. Hein

DOI: 10.1016/J.MARGEO.2012.11.008

关键词:

摘要: Abstract Over 150 million m3 of sand-sized sediment has disappeared from the central region San Francisco Bay Coastal System during last half century. This enormous loss may reflect numerous anthropogenic influences, such as watershed damming, bay-fill development, aggregate mining, and dredging. The reduction in also appears to be linked a supply recent widespread erosion adjacent beaches, wetlands, submarine environments. A unique, multi-faceted provenance study was performed definitively establish primary sources, sinks, transport pathways beach-sized sand region, thereby identifying activities processes that directly limit outer coast. integrative program is based on comprehensive surficial sampling System, including seabed, floor, area rock units, major drainages. Analyses sample morphometrics biological composition (e.g., Foraminifera) were then integrated with suite tracers 87Sr/86Sr 143Nd/144Nd isotopes, rare earth elements, semi-quantitative X-ray diffraction mineralogy, heavy minerals, process-based numerical modeling, situ current measurements, bedform asymmetry robustly determine region.

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