河口海岸域における砂浜地形の形成過程を読み解く試み

• 東 良慶

  京都大学防災研究所

• 平石 哲也

  京都大学防災研究所

• 関口 秀雄

  大阪市立大学理学研究科

書誌事項

タイトル別名

• IDENTIFICATION OF BEACH MORPHOLOGICAL CHANGES THROUGH GEOINFORMATICS AND GEOPHYSICAL/SEDIMENTOLOGICAL EXPLORATIONS

抄録

This paper is concerned with the development of an extensive sandy beach on an initially rocky coast facing the Sea of Japan, to which a diversion channel of the Shinano River was excavated and opened in early 1920s. From its completion, a significant volume of sediment has been discharged into the sea through the mouth of the channel, forming a sandy beach of 300ha over a period of nearly 100 years. This study focuses on how the sandy beach has been developed in association with the fluvial sediment inputs. Results of GIS analysis indicated an increase of the total subaerial beach area by 230ha in a period up to 1965. Thereafter the shoreline has stayed nearly stabilized. The sedimentary architecture of the beach was identified through comprehensive geophysical/sedimentological approaches including the surface-wave prospecting, Ground Penetrating Radar exploration and sedimentary facies analysis. The sediment volume analysis for the subaqueous domain led to an estimate for the maximum possible volume of sedimentation that could accumulate from the start of operation of the diversion channel.

収録刊行物

• 土木学会論文集Ｂ１（水工学）

  土木学会論文集Ｂ１（水工学） 69 (4), I_1477-I_1482, 2013

  公益社団法人 土木学会

キーワード

• 砂浜地形変化
• 土砂流出
• 物理探査手法
• 堆積相観察

詳細情報

• CRID: 1390282680328362624
• NII論文ID: 130004558185
• DOI: 10.2208/jscejhe.69.i_1477
• ISSN: 2185467X
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可