Water Science & Technology: Water Supply Vol 1 No 2 pp 37–48 © IWA Publishing 2001
Mathematical simulation on accumulation process of a blooming plankton
Peridinium bipes (Dinophyceae) in a dam reservoir
N Kishimoto*, I Somiya**, Y Ohnishi*** and T Nakamura****
*
Department of Environmental Engineering, Graduate School of Engineering,
Kyoto University, Yoshida-honmachi Sakyo-ku, Kyoto 606-8501, Japan
**
Department of Environmental Engineering, Graduate School of Engineering,
Kyoto University, Yoshida-honmachi Sakyo-ku, Kyoto 606-8501, Japan
***
Kansai Environmental Engineering Center, Co., Ltd., 1-3-5 Azuchi-cho,
Chuo-ku, Osaka 541-0052, Japan
****
The Kansai Electric Power Co., Inc., 3-11-20 Nakojii, Amagasaki-shi,
Hyogo 661-0974, Japan
ABSTRACT
The accumulation process of the blooming plankton Peridinium bipes was
studied in this paper using a mathematical model based on a horizontal
one-dimensional multi-layered flow model coupled with a vertical
migration model of the Peridinium bipes community. The estimated
accumulation process consisted of three processes: upward swimming
and dispersion of Peridinium bipes cells, advection of the cells
with the countercurrent of surface water, and entrainment and effluent
of the cells with the plunging flow of inflow river water. The numerical
analysis has revealed that the accumulation process helps Peridinium
bipes to avoid hydraulic washout and it contributes to a contributes
to a concentration of Peridinium bipes cells on the upper side of the
reservoir.
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