CHANGES IN WATER QUALITY IN THE NEWLY IMPOUNDED SUBTROPICAL FEITSUI RESERVOIR, TAIWAN1

Authors

  • Shui-Ping Chang,

    1. Respectively, Department of Environmental Engineering, Kung Shan Institute of Technology 949 Da-Wan Road, Yun Kan, Tainan County, Taiwan, Republic of China; and Professor, Department of Environmental Engineering, National Cheng Kung University, 1 University Road, 701 Tainan, Taiwan, Republic of China.
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  • Ching-Gung Wen

    1. Respectively, Department of Environmental Engineering, Kung Shan Institute of Technology 949 Da-Wan Road, Yun Kan, Tainan County, Taiwan, Republic of China; and Professor, Department of Environmental Engineering, National Cheng Kung University, 1 University Road, 701 Tainan, Taiwan, Republic of China.
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  • 1

    Paper No. 94145 of the Journal of the American Water Resources Association (formerly Water Resources Bulletin). Discussions are open until October 1, 1997.

Abstract

ABSTRACT: Water quality and trophic conditions in the Feitsui Reservoir, a subtropical reservoir, were evaluated with data from a ten-year data base to depict the impacts of river impoundment upon the chemical and biological characteristics of a reservoir, and to discuss the effects of flushing rate on in-lake phosphorus concentrations and phytoplankton growth. The results of the investigation showed that during the incipient impounding period, the water quality in the Feitsui Reservoir was significantly affected by internal loadings from submerged vegetation and soil in the flooded area. Studies of the changes in phosphorus compounds indicated that total phosphorus concentration appeared to approach equilibrium after the seventh year of impoundment and that orthophosphate stabilized after the sixth year of impoundment. Concentrations of both phosphorus forms varied seasonally after attaining stability. Nitrogen compounds (NH3-N, NO3-N and NO2-N) approached equilibrium within three years after impoundment. The seasonal variation in carbon was correlated to the number of phytoplankton. The mean value of the N:P mass ratio has remained over 110 since year seven of impoundment (1990), indicating that phosphorus constitutes the potential limiting nutrient in the growth of phytoplankton. The rapid flushing rate (132.11 and 110.43 yr-1) in Feitsui Reservoir during the first and second impounding stages was a critical factor influencing the phytoplankton growth response to available nutrients.

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