부산대학교 도서관

In the inner area of Ariake Sea, there are sediments (mainly clay) which repeating resuspension and deposition quickly at the surfade of the bottom sediment. We call this sediments as Fudei. The distribution of the pen shell in this area was affected by the Fudei since it inhibit the settlement of its larvae. However there were not enough data of Fudei. Therefore, we estimated the past distribution of Fudei using a numetical simulation and compared with the distribution of the juvenile pen shell to evaluate the influence of the Fudei on the settlement of its larvae. The simulation model we used was a 3 dimensional coupled hydrodynamic and sediment transport model which calculated the resuspension of bottom sediment based on the horizontal distribution of resuspension parameters from the water content of the surface sediment. In this time, we improved it to be able to treat the temporal variation in water content. Good agreement between calculation and observation was obtained for the Suspended Solid (SS). Also, it properly estimated the distribution of Fudei using the correlation between the estimated variation of the bottom hight and the observed Fudei thickness. The comparison between the estimated Fudei thickness and the distribution of the juvenile pen shell showed that pen shell could not survive in the Fudei thicker than 11 mm after its settlement. So, this study showed the inhibition effect of the Fudei on the larval settlement of pen shell quantitatively.