Abstract
Periphyton population dynamic model was designed by considering growth patterns of the speicies and detachment effect of shear stress on their communities. The modell allowed us to simulate the vertical disparities of biomass, nutrients within the periphyton mat, and morphological competition between filamentous and non-filamentous algae. The validity of the model was confirmed by comparing the computed algal biomass of three algal species, Spirogyra, Achnantes minitissima, and Synedra with the experimental data. It was found that high nutrient concentration in the overlying water does not always stimulate periphyton accumulation, that overlying velocity and light condition mainly drove net growth rate and peak biomasses, and that decomposition of detritus contributed to a balance of nutrient resource in basal layer.
