Japan Geoscience Union Meeting 2015

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International Session (Oral)

Symbol A (Atmospheric and Hydrospheric Sciences) » A-CG Complex & General

[A-CG07] Continental-Oceanic Mutual Interaction: Global-scale Material Circulation through River Runoff

Wed. May 27, 2015 9:00 AM - 10:45 AM 201B (2F)

Convener:*Yosuke Yamashiki(Global Water Resources Assessment Laboratory - Yamashiki Laboratory Graduate School of Advanced Integrated Studies in Human Survivability Kyoto University), Yukio Masumoto(Japan Agency for Marine-Earth Science and Technology), Swadhin Behera(Climate Variation Predictability and Applicability Research Program Research Institute for Global Change/JAMSTEC, 3173-25 Showa-machi, Yokohama 236-0001), Yasumasa Miyazawa(Japan Agency for Marine-Earth Science and Technology), Toshio Yamagata(Japan Agency for Marine-Earth Science and Technology), Kaoru Takara(Disaster Prevention Research Institute, Kyoto University), Chair:Yukio Masumoto(Japan Agency for Marine-Earth Science and Technology), Swadhin Behera(Climate Variation Predictability and Applicability Research Program), Toshio Yamagata(Japan Agency for Marine-Earth Science and Technology)

10:30 AM - 10:45 AM

[ACG07-06] Development of Biwa-3D to predict water quality in lakes and estuaries.

*Yosuke YAMASHIKI1, Masaki AZUMA2, Yadav Shweta3, Kaoru TAKARA4, Minoru YONEDA3 (1.GSAIS, Kyoto University, 2.Mitsubishi Tokyo UFJ Bank, 3.Graduate School of Engineering, Kyoto University, 4.DPRI Kyoto University)

Keywords:Lake, Water Quality, Dissolved Oxygen, Chlorophyll-a, Long-term variation

Biwa-3D, an integrated water quality model, has been developed for water quality assessment in lakes and estuary. Water temperature and dissolved oxygen in Lake Biwa has been numerically simulated using Biwa-3D with 250 m horizontal grid spacing. Calculated temperature has been compared with field observation results by Lake Biwa Environmental Research Institute (LBERI), showing good agreement especially in horizontal direction. The model outputs for dissolved oxygen concentration initially showed earlier decrease compared to the field observation results, which has been modified throughout adjusting vertical mixing procedure during stratified and non-stratified season. The model also showed non-uniform distribution in east-west section, which observation can not support due to the luck of sampling station. Seasonal change in Chlorophyll-a concentration is also simulated and compared with field observation data. Application of the model into different lakes, including Lake Tahoe, is introduced with relevant agreement with field observation dataset. Parallelization of the model enables us to perform long-term water quality prediction.