Assessment of Time-Space Evolutions of Intertidal Flat Geo-Environments Using an Industrial X-ray CT Scanner

F. Yamada1 — A. Tamaki2 — Y. Obara3

1Kumamoto University, Graduate School of Science and Technology 2-39-1 KurokamiKumamoto 860-8555Japanyamada@kumamoto-u.ac.jp

 

2Nagasaki University, Faculty of Fisheries 1-14 BunkyoNagasaki 852-8521Japantamaki@nagasaki-u.ac.jp

 

3Kumamoto University, Graduate School of Science and Technology2-39-1, KurokamiKumamoto 860-8555Japanobara@kumamoto-u.ac.jp

ABSTRACT. An industrial x-ray computed tomography (CT) scanner was used to investigate the time-space evolutions of vertical sediment structures in an intertidal flat with non-destructive conditions, at the mouth of the Shirakawa river, Japan. Seasonal sediment core samples were collected over one year at two locations. One location was Manila clam (Ruditapes philippinarum)-dominant, and the other clam non-dominant. Reconstructed three-dimensional images using Hounsfield Units (HU) demonstrated that water retention volumes in the intertidal sediment in the clam-dominant area existed up to 4 cm below the sediment surface. The CT results revealed that low-bulk density regions below the water-sediment interface are necessary for the survival of the Manila clam. Moreover, the shell hash composition of the substrate appeared to be related to the clam’s distribution.

 

KEYWORDS: Manila clam, biogenic structure, water retention, shell hash, industrial x-ray CT

1. Introduction

The Manila clam, ...

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