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沿岸域における自然現象を把握するための調査・解析手法にかかわる既存情報の収集・整理

Collection and analysis of existing information on applicability of investigation methods for characterizing natural events/processes in a coastal region

中安 昭夫; 新里 忠史; 安江 健一; 道家 涼介; 重廣 道子*; 田中 竹延*; 青木 道範*; 関谷 亜矢子*

Nakayasu, Akio; Niizato, Tadafumi; Yasue, Kenichi; Doke, Ryosuke; Shigehiro, Michiko*; Tanaka, Takenobu*; Aoki, Michinori*; Sekiya, Ayako*

本研究では、隆起速度,沈降速度,侵食速度,堆積速度,気候・海水準変動にかかわる調査・解析手法、並びに酸素同位対比曲線・海水準変動曲線の作成手法に関する既存情報を収集・整理し、それら手法の適用条件を整理することにより、沿岸域における自然現象の調査・解析手法の選定手順を知識として整理するための基礎情報を取りまとめた。その結果に基づいて、沿岸域において自然現象を把握するために適用可能もしくは適切と考えられる調査手法を検討した。その結果、侵食速度にかかわる手法では海成段丘面の侵食速度と周辺地域における侵食過程のシミュレーションが重要であることがわかった。気候変動については、湖沼堆積物が主な調査対象であり、海水準変動については、海成段丘面の調査と音波探査などの結果から隆起・沈降-海水準変動曲線並びに古地理図を作成する検討手順が適切と考えられる。

The investigation methods for characterizing natural events and processes in a coastal field have been extracted on the basis of analysis of previous research. Collected information is classified into three groups according to characteristics of natural events/processes and investigation methods. First group is the methods for evaluation of uplift, subsidence and sedimentation rates. Second group is the methods for evaluation ob denudation rates. The third group is the methods for reconstruction of the climatic and sea-level changes. Based on an analysis of the above information, investigation method that can be applied to a coastal region was extracted. The methods and indices are as follows: (1) Uplift rate: the heights of marine terraces are the most important index in an upheaval region. (2) Subsidence and sedimentation rate: the depths of strata underlying an alluvial plain are main indices in a subsidence region. (3) Denudation rate: the features of marine terrace are main indices and the inspection of denudation processes by the use of a numerical simulation is necessary. (4) Climate change: lacustrine deposits are main object for investigation. (5) Sea-level change: reconstruction of relative sea-level change curve including uplift/subsidence factor and paleography based on acoustic exploration and the investigation of marine terraces.

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