茨城県青塚海岸における荒天時の底質粗粒化機構に関する研究 Short-term Sand Coarsening Process during a Storm at Aotsuka Beach

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Abstract

Field observations of backshore morphology and sand grain size were conducted at the Aotsuka beach facing the Pacific Ocean in Japan, in order to investigate both wave and wind impacts on short-term backshore processes at a nourishment beach between headlands. The sand was coarsened notably only just after large waves during a storm in January 2005 in the seaward part of backshore; and then became finer in February. Sand coarsening and fining processes could be explained from calculation results of transport and depositional thresholds of sand grain size that the coarse sand was transported to the run-up area by large waves and then to the landward by strong landward winds. A new simple method using Hjulstrom diagram was developed to estimate the thresholds under both wave and wind action.

Journal

  • PROCEEDINGS OF COASTAL ENGINEERING, JSCE

    PROCEEDINGS OF COASTAL ENGINEERING, JSCE (55), 706-710, 2008

    Japan Society of Civil Engineers

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