INVENTORY ANALYSIS OF SUSPENDED RADIOCESIUM DERIVED FROM NIIDA RIVER DURING A TYPHOON-INDUCED FLOOD EVENT

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  • 台風201326号出水に伴う新田川起源懸濁態放射性核種の沿岸域でのインベントリ解析
  • タイフウ 201326 ゴウ イズミ ニ トモナウ ニッタガワ キゲン ケンダクタイ ホウシャセイ カクシュ ノ エンガンイキ デノ インベントリ カイセキ
  • タイフウ 201326ゴウ シュッスイ ニ トモナウ シン タガワ キゲン ケンダクタイ ホウシャセイカクシュ ノ エンガンイキ デ ノ インベントリ カイセキ

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Abstract

 Niida River is well know to supply highly contaminated suspended 137Cs originated from the Fukushima Nuclear Power Plant to the ocean. We examine the oceanic dispersal and inventories of the sediments and suspended 137Cs in the ocean floor derived from Niida River, using the quadraple nested JCOPE2-ROMS 3D circulation model in a very high resolution configuration, coupled with a 3D multi-class sediment transport model, the iRIC-Nays 2DH river sediment model, the SWAN spectral wave model, and a static 137Cs absorption model. We focus on the storm and flood event associated with Typhoon 201326 (Wipha) passed off the Fukushima Coast, which provoked an enomous amount of riverine fluxes, to quantitatively assess the accumulation and erosion of the sediments and resultant suspended 137Cs inventories around the river mouth and nearshore areas.

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