창녕함안보 구간 유역의 보 설치 전․후 하천 수질 변화 및 수질환경요인의 통계적 분석

Abstract

The study of water environment system using a multivariate analysis and comparison of water quality after Changnyeong-Haman weir construction in Nakdong river have been conducted. The purpose of this study is to establish better understanding related water qualities in the Changnyeong-Haman weir section which can provide useful information. The data were consisted of algae data and water quality data including several parameters. Statistical analyses used in this study were correlation analysis, principal components, and factor analysis. According to result among water quality parameters, strong relationship between BOD, COD, and TOC have been observed. Besides, in the correlation of water quality parameters and algae, a negative correlation was observed between diatoms and d-silica. Furthermore, the results of principal component analysis to the overall water quality were classified into three main factors. In addition, when comparing before and after construction weir, overall water qualities have get better, but the occurrence of phytoplankton was increased. As increasing volume of water flow and residence time after construction weir, the relatively lower concentration of nutrient has been indicated. Therefore, the good conditions for phytoplankton to grow up are formed.