“The Impact of Phosphorus Load and Water Through-Flow on Phytoplankton Standing Crop in a Dimitic Lake”

Authors: Knut L. Seip,
Affiliation: Centre for Industrial Research (SI)
Reference: 1981, Vol 2, No 3, pp. 163-179.

Keywords: Phosphorus, phytoplankton, eutrophication, ecosystem, lake, management, modelling, simulation

Abstract: A mathematical model has been developed for the mesotrophic Lake Mjesa (365 x 106 m2, 61´ N, 11° E). Emphasis has been made on the interaction between biological and hydrodynamic variables. Simulation results for phytoplankton and nutrient concentrations in both the epilimnion and the hypolimnion compare fairly well with observations. Investigative simulations have been made to study the effects of injecting nutrients at different depths assuming three alternative schemes for diffusion across the thermoclinc. The overall results indicate that the phytoplankton standing crop is less sensitive to nutrient injection depths when diffusion increases, and that the high efficiency of hypolimnetic injection reported for some lakes in the literature will not be obtained in the present lake. Simulation studies of changes in river flow indicate that changes in peak flow time (inside the domain of natural variability) have a greater impact on the phytoplankton standing crop ( less than 20%) than changes in flow volume ( less than 6%). Simulations also indicate that light extinction caused by suspended particles associated with river flow may be important in sections of the lake.

PDF PDF (4869 Kb)        DOI: 10.4173/mic.1981.3.2

DOI forward links to this article:
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[2] Knut L. Seip and Tomoichi Satoh (1983), doi:10.1080/03680770.1983.11897452
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  title={{The Impact of Phosphorus Load and Water Through-Flow on Phytoplankton Standing Crop in a Dimitic Lake}},
  author={Seip, Knut L.},
  journal={Modeling, Identification and Control},
  publisher={Norwegian Society of Automatic Control}