JUNTUNEN, Janne

KALLIO, Kari

KOPONEN, Sampsa

LIUKKO, Ninni

MALVE, Olli

MANO, Akiko

ROPPONEN, Janne

TASKINEN, Antti

Okayama University Scientific Achievement Repository

Assimilation of satellite data to 3D hydrodynamic model of Lake Säkylän Pyhäjärvi  Akiko Mano1, Olli Malve2, Sampsa Koponen2, Kari Kallio2, Antti Taskinen2, Janne Ropponen3, Janne Juntunen3, Ninni Liukko3  1 Ochanomizu University, 2-1-1, Ohtsuka, Bunkyo-ku, Tokyo 112-8610, Japan,  mano.akiko@ocha.ac.jp 2 Finnish Environment Institute, P.O. Box 140, SF00251 Helsinki, Finland 3 Finnish Environment Institute, Technopolis, Survontie 9, 40500 Jyväskylä, Finland   Abstract: To analyze the applicability of occasional initialization (OI) of total suspended matter (TSM) concentration field based on turbidity derived from satellite data to numerical simulation, dispersion studies of suspended matter in Lake Säkylän Pyhäjärvi (lake area 154 km2; mean depth 5.4 m) were conducted using the 3D COHERENS simulation model. To evaluate the practicality of OI, five cases with different initialization frequencies were conducted: 1) every time, when satellite data were available; 2) every 10 d; 3) 20 d; and 4) 30 days; 5) control run without repeated initialization. To determine the effectiveness of initialization frequency, three methods of comparison were used: simple spatial differences of TSM concentration without biomass in the lake surface layer; averaged spatial differences between initialization data and model results; and time series of TSM concentration and observation data at 1 m depth at the deepest point of the lake. Results showed that OI improves the prediction significantly when applied often, i.e. at 10 day intervals. Even if it is applied less often, OI improves the prediction.  Key words COHERENS; model prediction; suspended particulate matter; suspended solids; turbidity; water quality    This paper has already been submitted to water science and technology  - 108 -

(Abstract for Journal paper) Assimilation of satellite data to 3D hydrodynamic model of Lake Säkylän Pyhäjärvi

(Abstract for Journal paper) Assimilation of satellite data to 3D hydrodynamic model of Lake Säkylän Pyhäjärvi

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