| Summary: | 碩士 === 國立臺灣海洋大學 === 海洋環境資訊學系 === 101 === The main tributaries of the Danshui Estuary are the Tanhan, the Hsintien and the Keelung Rivers. It is found that the Keelung River was the most polluted river among these three rivers because of the dense population. These rivers were cleaned since 1990 and the EPA declared that the water quality of these rivers has been improved. This study bi-weekly investigated the water quality of the upper reach of the Keelung River from May 2011 to March 2012. The water quality of the middle and lower estuary of the Danshuei Eutuary were also investigated twice during the study period. The river pollution index (RPI) was employed to examine the water quality of the Keelung River.
The concentration ranges of the studied parameters found in the upper reach of the Keelung River, and the middle and lower estuary of the Danshuei Eutuary were as follows: pH, 6.92-8.72 and 7.70-8.07; DO, 7.12-8.99 mg/L and 4.15-8.99 mg/L; BOD5, 0.03-7.54 mg/L and 0.76-8.45mg/L; Phosphate, 0.05-4.33 μM and 0.59-4.56 μM; Silicate, 55.3-178.7 μM and 19.2-178.7 μM; NH3-N, 0.56-36.35 μM and 20.1-283.3 μM; Nitrite, 0.13-25.32μM and 1.81-18.67μM; Nitrate, 4.47-86.28 μM and 1.91-312.3μM; chl.a, 0.12-13.76 μg/L and 0.20-60.78 μg/L. The RPI results indicated that the water quality of the upstream of the Keelung River, Hou-Dong and Ray-Fone Bridge, was good and the anthropogenic pollution was minor. However, the RPI value from the Badu area, the midstream of the Keelung River, to the lower estuary ranged within 1-5.25, indicating that the water quality was bad because of the dense population. This study suggests that weathering factor influences the water quality of the upstream of the Keelung River is minor. In contrast, the water quality of the mid and lower estuary of the Danshuei estuary is still bad and is strongly influenced by the anthropogenic activity.
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