The Algal Ecological Modeling in Hsin-shan Reservoir and Preliminary Study in Eutrophication Control
Date Issued
2006
Date
2006
Author(s)
Hsu, Chia-Chen
DOI
zh-TW
Abstract
Hsin shan reservoir is located in Keelung, Taiwan. By sampling during last year, we collected the water quality data of this reservoir, including algae phase and nutrient such as ammonia nitrogen, nitrate and phosphate. These data were used in developing an algae dynamic model which is zero dimension. From surface to ten meters down to the water, we divided three levels to simulate the growth situation of different kinds of algae. The measured data showed that there was a phenomenon about algae succession happened in this reservoir. The physical characteristics of different kind algae and the environmental condition controlled which kind of algae would be the widely distributed species. Take Hsin Shan reservoir for example, Cyanophyta had a wide distribution in summer, but in fall, Bacillariophyta and Chrysophyta replaced it.
After calculating all parameters of this model, other data were needed to verify the model. This model can also be used for environmental management, and to predict when bloom will happen in reservoirs.
Eutrophication is a serious problem in reservoirs, and Hsin shan reservoir was examined beyond standard in 2003 with Carlson Index. In order to correct this, we established a pilot in this reservoir. In the pilot, mixing was thought to destratify the stable condition of water. In the end of the experiment, the goal species, Microcystis, didn’t leave the water body. The possible reason was that the environment below the surface water was also suitable for it, and there might be enough light and nutrient for its growth. More powerful mixing or other artificial methods are needed to alleviate the bloom happened in Hsin shan reservoir.
Subjects
優養化
動態模擬
水體分層
限制因子
混合係數
eutrophication
algae succession
dynamic modeling
water stratification
limiting factor
mixing coefficient
Type
thesis
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