Integrated Water Quality and Ecological Models - Hsin-Shan Reservoir as a Case Study
Date Issued
2007
Date
2007
Author(s)
Lin, Po-Yu
DOI
zh-TW
Abstract
Hsin-Shan Reservoir provides the water supply of Keelung. The main source of this reservoir is Keeling River. Keelung River is a very polluted river because of the drainage of commercial, industrial and residential. According to Carlson Index, its water quality is in eutrophication level. Phosphorus and nitrogen of Keelung River is the main reason of eutrophication. This research uses three models, Vollenweider, WASP, and Ecopath, to analysis the water quality of reservoir. In the end, we establish a way for providing a biological treatment evaluation method. The field data of 2004 and 2005 is collected in the research.
The main reason of eutrophication in Taiwan is phosphorus. Vollenweider is used as a total phosphorus mass balance modeling to simulate the Hsin-Shan Reservoir. The result is quite well. The maximum concentration is happened in summer. Next, we use WASP to do more explicit simulation. The result WASP shows a good trend and very closed to the field data. We use WASP to see how many pollutants should be reduced if we want the water quality is no more eutrophication level after the model established. According to our analysis, if we want to reach the mesotrophic level, 30 to 40% pollutants would need to be removed from inflow. Further more, if we cut down 70 to 80% pollutants, the whole reservoir would be in oligotrophic level. These two models showed that the main pollutant source is the Keelung River and the eutrophication is happened in summer period. In order to understand the ecosystem of Hsin-Shan Reservoir, we use Ecopath as ecological model. The outcome shows, the total primary production/total respiration of Hsin-Shan Reservoir is 1.228. It can say the ecosystem of Hsin-Shan Reservoir is very close to the mature one.
In recent year, more and more biological treatment methods are used to replace the traditional construct methods. The main problem of biological treatment is the difficult of evaluate the effect of biological treatment. We try to put some pearl shell in reservoir to control phytoplankton. Before field exam, we used models to estimate the effect of such a work. This research combines the models of WASP and Ecopath to calculate the erasing rate relationship between pearl shell and phytoplankton. The equation of the pearl shell number and chlorophyll a concentration is y = 69378 exp(-0.3442x), here y is the number of pearl shell, x is the concentration [ppb] of chlorophyll a. The result shows if we want to reach mesotrophic level, about 3000 pearl shell will be needed.
Subjects
水質模擬
生態模式
生態工法
敏感度分析
新山水庫
Vollenweider
WASP
Ecopath
ecological engineering
reservoir water quality modeling
Eutrophication
Hsin-Shan reservoir
SDGs
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-96-R94521311-1.pdf
Size
23.31 KB
Format
Adobe PDF
Checksum
(MD5):7bc873a3d4907b891ed1977b7316bf64