Trend analysis and regression models of water quality in the upper watershed of the Feitsui Reservoir
Date Issued
2010
Date
2010
Author(s)
Wu, Hsiao-Ting
Abstract
The aim of this study was to evaluate the effects of the development of the upper watershed of the Feitsui Reservoir on the water quality trends using non-parametric seasonal Kendall test. Seven water quality parameters including dissolved oxygen (DO), suspended solids (SS), total phosphorus (TP), ammonia nitrogen (NH3-N), biochemical oxygen demand (BOD), total coliform (TC), and pH value were studied. This study also developed regression models to estimate water quality; the variables consideres include land slope, landuse, and sites of the areas.
Construction of Taipei-Ilan Freeway started in 1996 and finished in 2005. A case study was conducted to evaluate potential effects of the construction activities on the quality of nearby water bodies. The results indicated that the SS and pH values of the nearby rivers increased; on the other hand, the DO value decreased.The changes could be attributed to the conctruction activities of the freeway.
It was reported that flow-adjusted concentrations can reflect anthropogenic effects, so this study also compared the flow-adjusted concentrations with observed values. The results indicate that the flow-adjusted concentrations of TP increased downstream of Bei-Shih and Tai-yu-cheuh streams. The flow-adjusted concentrations of NH3-N also increased downstream of Tai-yu-cheuh stream. The tea-agriculture might be the contributing factor for the increases.
The results of the regression models show that urban land use coupled with land slope have noticeable impact on total coliform and total phosphorus concentrations. The BOD concentrations depended more heavily on landuses.
This study provides a useful tool to estimate the effects of urban developemant on quality trend of receiving waters. Regression models developed could be used to evaluate the effects of land use, land slope, and sites of watershed on water quality.
Subjects
Upper watershed of the Feitsui Reservoir
water quality trends
water quality estimated regression model
SDGs
Type
thesis
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