Abstract
To measure spatial distribution of water flow in tidal flat, a simple method using gypsum body was developed. Gypsum body dissolution rate in steady water flow was proportional to the velocity. The investigation about water flow with gypsum body and bivalves distribution was carried out in Nojima beach, Yokohama. Relationship was confirmed between velocity with flowmetry and calculated velocity with gypsum body. As a result, the method is applicable to measurement of cumulative-averaged velocity. The bivalves distribution in Nojima beach showed lower distribution at the north off shore, where is corresponded to high water flow area. It was implied that high water flow is one of restricted habitat factors of the bivalves in Nojima beach.
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