Laguna : 汽水域研究

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Laguna : 汽水域研究 2
1995-03 発行

島根大学の構内遺跡にみられる側方付加堆積物とそこから推定できる古流速

Lateral Accretion Deposits and Their Paleocurrent Velocity at Ruin Site in Shimane Univeraity, Western Japan
Nakamura, Tadashi
Nakayama, Katsuhiro
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Description
Holocene lateral accretion deposits are observed at a ruin site in Shimane University. We described these deposits, and evaluate a paleocurrent velocity based on their description. The deposits are formed by a meandering river during flooding stage, implying the fluctuation of the Jomon transgression which is the most remarkable transgression recorded in Japanese Holocene deposits. Paleocurrent velocities are estimated using critical shear velocities for entrainment, and dune-upper plane bed transition. Depth-mean velocities were approximately between 0.51 and 2.2 ms-1.