A Correlation Analysis of the River Naturalness and Water Quality for Biological Habitat Evaluation

In this study, the analysis of river naturalness and water quality were executed in the major rivers of the Nakdong River Basin. As a result, the assessment index of the General Evaluation was 1.428 to 4.107 as $1^{st}$ to $4^{th}$ grades. The River Shape was 1.929 to 4.429 as $2^{nd}$ to $4^{th}$ grades and the River Environment was 1.774 to 3.643 as $1^{st}$ to $4^{th}$ grades. As well, evaluation of water quality showed that concentration of pH was 7.102 to 8.497 mg/l, BOD was 0.748 to 5.271 mg/l, DO was 5.077 to 12.335 mg/l and 55 was 3.658 to 19.960 mg/l. The correlation between river naturalness and water quality was analyzed to investigate similarity and independence of river naturalness evaluation index. It was shown that coefficient of correlation was low with value of -0.1503 to -0.5886, therefore, was evaluated as independent.

하천 생물 서식처 평가를 위한 하천 자연도와 수질의 상관성 분석

금번 연구에서는 낙동강 유역내 주요하천을 대상으로 자연도 평가와 수질을 분석하였다. 하천 자연도의 종합평가 결과는 $1.428{\sim}4.107$의 1등급과 4등급으로 평가되었으며, 부문별 평가 결과는 하천형태의 평가지수가 $1.929{\sim}4.429$로 2등급에서 4등급으로, 하천환경의 평가지수는 $1.774{\sim}3.643$의 1등급에서 4등급으로 평가되었다. 수질 평가 결과는 수소이온농도는 $7.102{\sim}8.497 mg/l$이었으며, 생물화학적 산소요구량은 $0.748{\sim}5.271 mg/l$, 용존산소량 $5.077{\sim}12.335 mg/l$, 부유물질은 $3.668{\sim}19.960 mg/l$ 이었다. 하천 자연도 평가 지표의 독립성과 유사성을 판단하기 위하여 하천 자연도 평가와 수질 상관분석을 실시한 결과, 상관계수가 $-0.1503{\sim}-0.5886$로 낮은 상관성을 갖고 있으며, 서로 독립적인 지표인 것으로 분석되었다.