[A-CG33] Land-Ocean Interaction -Water and material cycle for coastal ecosystems-

[ACG33-11] Analysis about the condition of sea water intrusion to Yodo River estuary by the fluid model

*Ippei NAKAMURA¹, Yuto KOYAMA¹, Satoshi NAKADA¹, Mitsuru HAYASHI¹ (1.Kobe University)

Keywords:Yodo River, sea water intrusion, Red tide, shellfish poison, fluid model

Red tide of Alexandrium tamarense occurred in Yodo River estuary in recent years. A. tamarense is marine phytoplankton and causes shellfish poisoning. Sea water intrusion to Yodo River is one of the reasons of marine phytoplankton survive. We investigated the distribution of the sea water intrusion by in-situ observation, then reproduced it by the fluid model. Fluid structure of Yodo River estuary consists by the runoff of fresh water, the esturey circulation, the tidal current and the wind driven circulation. These had contributed at almost same rate to sea water ascension.