11:35 〜 11:50
[ACG05-09] 海洋ー水文結合モデルの開発
キーワード：海洋モデル, 水文モデル
A new hydro-oceanic coupled model is developed for examining the basic dynamics of river-ocean interaction in estuary zones during high water discharge events. These high frequency and vigorous events are not reproduced in climatological river transport data sets that are often used in ocean circulation models. The new hydro-oceanic model is based on an isopycnal layer model. It treats continental and oceanic water with separate layers but allows dynamical interaction between the two. Mixing between the two layers occurs through a Richardson number criterion. When the model is forced with Radar-Rain gauge analyzed precipitation data around eastern Japan, the model simulates the river discharge of Abukuma river basin that is analogous to observations. The abrupt changes in the water mass transport at upstream and downstream locations are well captured, showing its applicability for hydrological basin analysis. Freshwater plumes that hug along the oceanic coasts are also well captured. We find the model, based on single dynamical core, useful for both hydrological catchment and estuary mixing zone and can be used for examining the impact of weather related events.