Japan Geoscience Union Meeting 2018

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[EE] Oral

A (Atmospheric and Hydrospheric Sciences) » A-OS Ocean Sciences & Ocean Environment

[A-OS12] Continental-Oceanic Mutual Interaction: Planetary scale Material Circulation

Tue. May 22, 2018 9:00 AM - 10:30 AM 106 (1F International Conference Hall, Makuhari Messe)

convener:Yosuke Alexandre Yamashiki(Earth & Planetary Water Resources Assessment Laboratory Graduate School of Advanced Integrated Studies in Human Survivability Kyoto University), Yukio Masumoto(Graduate School of Science, The University of Tokyo), Swadhin Behera(Climate Variation Predictability and Applicability Research Group, Application Laboratory, JAMSTEC, 3173-25 Showa-machi, Yokohama 236-0001, 共同), Takanori Sasaki(Department of Astronomy, Kyoto University), Chairperson:Yamashiki Yosuke(GSAIS Kyoto University), Swadhin Behera(JAMSTEC)

10:15 AM - 10:30 AM

[AOS12-06] Modeling of Extreme Freshwater Discharge and influence from Japanese First-Class Rivers to Coastal zones

*Ryusuke Kuroki1, Yosuke Alexandre Yamashiki1, Sergey Varlamov2, Yasumasa Miyazawa2, Racault Fanny Marie3, Hoshin Vijai Gupta4 (1.Graduate School of Advanced Integrated Studies in Human Survivability, Kyoto University, Japan, 2.Application Laboratory, Japan Agency for Marine-Earth Science and Technology, Japan, 3.Plymouth Marine Laboratory, Plymouth, United Kingdom, 4.University of Arizona)

Keywords:Optimization, Fresh Water Discharge from Japanese first-class rivers to coastal zones, Sea surface salinity distribution, Chlorophyll-a distribution

We estimated the effects of extreme fresh water discharge from Japanese first-class rivers to coastal zones of the Japanese coast. Our targeted event was a typhoon Etau from 06/09/2015 to 12/09/2015, a week, and we could success to optimize 5 parameters, soil roughness coefficient, river roughness coefficient, effective porosity, saturated hydraulic conductivity, and effective rainfall by using Shuffled Complex Evolution method developed by University of Arizona (SCE-UA method), that is one of the optimization method for hydrologic model during this week. In addition to this, we made a set of hourly simulated river outflow data of almost all of Japanese first-class rivers from these basins to the Pacific Ocean and the Sea of Japan during the period by using our model “Cell Distributed Runoff Model Version 3.1.1 (CDRMV3.1.1)”. After the simulation, we used these calculated discharge data with a coupled hydrological-oceanographic model JCOPE-T for estimation of sea surface salinity distribution (SSS) in Japanese coastal zones. And simulated SSS results were verified by comparison with Chlorophyll-a distribution, observed by satellite re-mote sensing. Therefore we successfully reproduced peak discharge prediction of extreme typhoon events on river mouth and the coastal oceanic circulation.