Long-and Short-term Trends of Shoreline Position Change near the New Mouth of the Omono

H. Matsutomi, Yohei Kondo, Taichi Kimura, Hitoshi Tanaka
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Abstract

Long-termt rendo f shorelinep ositionc hangen ear the new moutho f the Omonop ouringi nto the sea of Akita Southern Coast is discussed by using old map, topographicaml aps, field data collected in the last fifteeny ears and by examining accuracy of the old map (Inoul arge-scalem ap). Short-termt rend of shorelinep osition change on the same coast is also discussed to judge whethera remarkabler eceding of shorelinep ositiona t the Hamada-hamab athingp lace located near the mouth in July 2006 is a rare case. Through these discussions, it is concluded that 1) the shoreline position had basi cally advanced from 1800 to around 1900, and then it has gradually receded undulating and 2) the remarkable receding in July 2006 is not a rare case from the viewpoint of absolute shoreline position change
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欧莫诺新河口附近海岸线位置变化的长期和短期趋势
本文利用旧地图、地形图、近15年来的野外数据,并通过对旧地图(Inoul大比例尺地图)的精度检验,讨论了秋田南海岸新河口入海后的海岸位置变化的长期变化。本文还讨论了同一海岸岸线位置变化的短期趋势,以判断2006年7月靠近河口的滨田-滨海事件发生的岸线位置明显偏移是否罕见。通过这些讨论得出结论:1)从1800年到1900年前后,岸线位置基本前进,然后逐渐退潮起伏;2)从岸线位置绝对变化的角度来看,2006年7月的明显退潮并非罕见
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