Distribution of Organotin Compounds in the Bottom Sediment and Transportation Process of Sediment Particles in a Semi-enclosed Bay

Abstract

Horizontal distribution of the organotin compounds in the bottom sediment was examined in the Kaita Bay that is located at the head of Hiroshima Bay. The concentration of the organotin compounds was the highest at the portion in a front sea area of the shipyard and has decreased along with the distance from this portion. This result suggested that the bottom sediment particles that absorb the organotin compounds were transported from the shipyard sea area Moreover, the transportation process of the bottom sediment particles was examined using the transport numerical model of particle. Result of model computation indicated that the horizontal distribution of the organotin compounds is affected by estuarine circulation due to the river inflow.