关键词: 水体环境学, 水质模型, 敏感性分析, 生化参数, 草堂河, 三峡库区

Abstract: The purpose of parameter sensitivity analysis of water quality model is to identify the parameter importance to the modeling accuracy and help selecting the high sensitivity parameters from multiple parameters for modeling analysis. In this paper, an ecological dynamic model was established and verified for the Caotang River, one tributary in TGP reservoir area, and the parameter sensitivity of the model was analyzed by the perturbation method. The sensitivity analysis of 26 parameters in the model shows that the maximum growth rate of phytoplankton, optimum lower bound of optimal temperature of phytoplankton, mortality linear coefficient of phytoplankton, lowest light intensity, background light extinction coefficient, shading coefficient, half-saturation constant of phosphorous uptake are the most sensitive parameters and other parameters are lower sensitive. For the same parameter, the sensitivity changes in different seasons, generally, lower in summer and spring and higher in autumn and winter.

Key words: water environmentology, water quality model, parameter sensitivity analysis, biochemical parameter, Caotang River, TGP reservoir area