リズミックな尖角岬群と砂嘴群の発達に及ぼす人工改変の影響

概要

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The development of sand spits and cuspate forelands with rhythmic shapes was numerically predicted using the BG model proposed by Serizawa et al. under the oblique wave incidence that the angle between the direction normal to the shoreline and wave direction is ±60 degrees, given an infinitesimal perturbation as the initial condition. Then the effects of the anthropogenic factors such as the construction of a groin and an offshore breakwater to the development of sand spits and cuspate forelands were investigated using the same model. The construction of a groin induced a great impact to the sandy beach; the alteration from the field with the development of the sand spits to that with the elongation of single sand spit, as well as the acceleration of offshore sand transport because of the blockage of longshore sand transport. The construction of an offshore breakwater strengthened the wave-sheltering effect as well as the blockage of continuous longshore sand transport, resulting in dominant beach changes. The calculated results in the case with an offshore breakwater reasonably explained the example of the formation of the sand bars with two lagoons inside observed in a shallow lagoon surrounded by Black Sea and Azov Sea in Russia.
日本地形学連合の論文
2013-01-25