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- Title
Global Sensitivity Analysis of a Water Quality Model in the Three Gorges Reservoir.
- Authors
Cheng, Yao; Li, Yajun; Ji, Fei; Wang, Yuchun
- Abstract
Global sensitivity analysis is the key to establishing advanced and complex water quality models and measurements of ecological parameters. In this paper, the Sobol's sensitivity analysis method was applied to a quantitative analysis of the important factors governing a water quality model, which has been developed to simulate algal dynamics in Caotang Bay, one of the tributary bays in the Three Gorges Reservoir, China. The analysis focused on the response of chlorophyll-a and dissolved oxygen to 11 parameters. The results show that chlorophyll-a is influenced mainly by the maximum phytoplankton growth rate, the lower optimum temperature for algal growth, the phosphate half-saturation constant, and the phytoplankton linear mortality rate; while dissolved oxygen is influenced mainly by the maximum phytoplankton growth rate, the lower optimum temperature for algal growth, the phytoplankton basal respiration rate, and the detritus remineralization rate. These parameter sensitivities change with time and have a marked seasonal pattern. The parameter sensitivity differences between a shallow lake or reservoir and a deep reservoir suggest that mechanisms of cycling in nutrients and dissolved oxygen are different.
- Subjects
CHINA; MATHEMATICAL models; WATER quality; CHLOROPHYLL in water; DISSOLVED oxygen in water; SAN Xia Reservoir (China); HARBORS
- Publication
Water (20734441), 2018, Vol 10, Issue 2, p153
- ISSN
2073-4441
- Publication type
Article
- DOI
10.3390/w10020153