Principal Component Analysis of Water Quality and Sediment in NanKan River

• Main Authors: Chieh-Ling Ni, 倪婕舲
• Other Authors: Shang-Lien Lo
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/kjhzxa

碩士 === 國立臺灣大學 === 環境工程學研究所 === 105 === The NanKan River flows through many industrial areas, crowded cities and wide range of agriculture and livestock. The electronic and mechanical manufacturers in this area are highly productive. Hence, the river pollution currently belongs to moderately-polluted river. The principal component analysis (PCA) is used in this study to investigate the variable and main factor of water quality, industrial effluent and sediment in environment. Through statistics analysis to find the key points for solving the problem that improving water quality and sediment in NanKan River. According to the PCA of collected water quality data, it can be found that river water quality can be extracted as five components, biological factor, nutrient factor, heavy metal factor, temperature factor, acid and alkali factor. The effluent data can be extracted as two components, biological factor, acid and alkali factor (copper). The sediment of the NanKan River can be extracted as two components, heavy metal factor and plastic additive factor. The common influencing factor is heavy metal factor (copper), presumably due to the discharge of copper from industrial effluent. The statistics results show that the conformity of copper in the sediment is 31.58 %, the industrial effluent is 92.61 %, and the river water quality is 39.47 % from 2012 to 2016. The Copper concentration in sediment has high connectivity with those of in river water quality and industrial effluent. The results of PCA also show that the co-influencing factor of the sediment, the industrial effluent and river water quality is heavy metal factor (copper), and the principal component loading are 0.510, 0.780 and 0.919. The most severe area of the copper pollution in Dapoo Bridge is speculated from the upstream such as the Linkou Industrial Park and the Hwa Ya Technology Park or other surrounding factories, the next is in Dakwai River Bridge which is from the upstream of Guishan Industrial Park and the bridge in Nankan River and Jhuweida.