砂浜の侵食域・堆積域における地形断面の季節変化についての一考察

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  • Seasonal Changes in the Erosion and Accumulation Sections of a Portion of Yamoto Sand Beach, Sendai Bay, Northeast Japan
  • スナハマ ノ シンショクイキ タイセキイキ ニ オケル チケイ ダンメン ノ キセツ ヘンカ ニ ツイテ ノ イチ コウサツ

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The monthly cross-section measurement of a sandy beach was carried out from March, 1994 until December, 1994 in order to compare the differences in seasonal changes of the erosion or accumulation section of the beach.<br>The area investigated is on Yamoto Sand Beach, which faces Sendai Bay, on the northeastern part of Honshu island. Six headlands have been constructed on this beach in recent years, in order to protect it from the coastal erosion. The headlands have been installed at about 1, 000m intervals, and stick out about 150m into the sea. The area investigated was between two headlands. On the sandy beach within these headlands, the line joining the erosion section and accumulation section was clear, because the conveyance of sand by the coastal current was obstructed by the headlands.<br>The surveying line intersecting with the right angle in the coastline was set up at about 50m intervals. Along the line, measurements were carried out using a simple surveying instrument.<br>The results of the measurements are as follows:<br>(1) It was shown that the same morphological changes were occurring in the erosion and accumulation sections. Both the erosion section and accumulation section accumulate (or erode) in the same amount of time.<br>(2) The amount of accumulation (or erosion) occurring each month were different in each section. The amount of erosion relatively exceeded the amount of accumulation in the erosion section. On one side of the accumulation section, the amount of accumulation exceeded the amount of erosion.<br>It was postulated that the relative difference of a small change in the cross-sectional area (sand volume) determined the tendency (erosion or accumulation) of the applicable section during the investigation period.

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