安倍川からの供給土砂量の増減に応じた静岡清水海岸の地形変化とその再現計算

概要

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Long-term topographic changes since 1985 along the entire Shizuoka and Shimizu coasts with a 17km stretch extending between the Abe River mouth and the tip of the Mihono-matsubara sand spit were investigated using the bathymetric survey data collected once a year since 1985. Beach erosion of these coasts was triggered by the decrease in sediment supply from the Abe River due to excessive riverbed mining until 1967. After 1982/83 natural sand supply from the river increased and accretion occurred on these coasts. Measured topographic changes were reproduced using the contour-line-change model considering grain size change. In the calculation, not only the movement of sand body but also the shoreline and bathymetric changes were numerically reproduced. The calculated results were in good agreement with the measured topographic changes.
2011-10-25