Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Trend Analysis of Monthly Water Quality Data in Nakdong River Based on Seasonal Mann-Kendall Test

계절 Mann-Kendall 검정을 이용한 낙동강 유역의 월별 수질 장기 경향성 분석

  • Yun, Jung-hye (Dept. of Agriculture Engineering, Gyeongsang National Univ.) ;
  • Hwang, Syewoon (Dept. of Agricultural Engineering (Insti. of Agric, and Life Sci) Gyeongsang National Univ.) ;
  • Kim, Dong-Hyeon (Dept. of Agriculture Engineering, Gyeongsang National Univ.) ;
  • Kim, Sang-Min (Dept. of Agricultural Engineering (Insti. of Agric, and Life Sci) Gyeongsang National Univ.)
  • Received : 2015.10.19
  • Accepted : 2015.11.24
  • Published : 2015.11.30
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Abstract

In this study, we analyzed the trends of water quality along the main stream in Nakdong river basin using the recent data and seasonal Mann-Kendall test. Monthly averaged values of DO, BOD, SS, COD, TN, and TP from 1989 to 2014 for 14 stations (including 2 TMDLs stations) were used in the study. The trend analysis results showed that BOD and TP at most stations has decreasing temporal trend except a few stations while COD and SS showed increasing trend at most stations. Temporal trends in TN at 8 stations were found to be statistically significant and 5 of them showed increasing temporal trend. Temporally averaged BOD, COD, TN and TP were generally increasing as going downstream and the worst water quality were found at Goryeong and Hyunpung station. Overall, water quality of Nakdong river especially in COD, SS, and TN getting worse in time at most stations and as going downstream.

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