SEDIMENT STRATIGRAPHY OBSERVED BY MASW SURVEY ALONG AN ARRAY COMPRISED OF SUPRALITTORAL, MEDIOLITTORAL, AND INFRALITTORAL ZONES
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- WATABE Yoichi
- 海上・港湾・航空技術研究所 港湾空港技術研究所 地盤研究領域 土質研究グループ
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- KANEKO Takashi
- 海上・港湾・航空技術研究所 港湾空港技術研究所 地盤研究領域 土質研究グループ
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- SASSA Shinji
- 海上・港湾・航空技術研究所 港湾空港技術研究所 地盤研究領域 動土質研究グループ
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- HASHIMOTO Yuji
- 応用地質（株）関西支社技術部
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- NAKAJO Sota
- 大阪市立大学 工学研究科
Bibliographic Information
- Other Title
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- MASWを活用した潮上帯・潮間帯から潮下帯に至る干潟堆積土砂構造評価
- MASW オ カツヨウ シタ チョウ ジョウタイ ・ チョウカンタイ カラ チョウ シタオビ ニ イタル ヒガタ タイセキ ドシャ コウゾウ ヒョウカ
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Abstract
The Okoshiki Coast in Uto City, Kumamoto Prefecture, Japan, is a beautiful sandy tidalflat with rhythmical variation of multi-bar-trough structure. To investigate the sediment stratigraphy, multi-channel analysis of surface waves (MASW) was applied to this sandflat; however, the conventional method using geophones was only applicable to exposed regions in supralittoral and mediolittoral zones. In this study, MASW array was extended from mediolittoral to infralittoral zones by using hydrophones instead of geophones. Sediment stratigraphy was successfully evaluated by using geophones in supralittoral and mediolittoral zones during exposed periods and using hydrophones in mediolittoral and infralittoral zones during submerged periods. In the MASW survey using hydrophones conducted on a boat, it must be noted that the shear wave velocity structure at shallower depth is influenced by the offset distance between the shot point and the nearest hydrophone.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 72 (2), I_1699-I_1704, 2016
Japan Society of Civil Engineers