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2020 Vol.62, Issue 5 Preview Page
Analysis of Water Quality Fluctuations in Upstream Namhan River Watershed Using Long-term Statistical Analysis

통계적 경향 분석을 통한 남한강 상류 수계 수질 변동 해석

Sang-Don Byeona
,
Yeon-Jung Nohb
,
Kyeong-Jae Limc
,
Jong-Gun Kimd
,
Dong-Jin Kime
,
Eun-Mi Hongf†
변 상돈a
,
노 연정b
,
임 경재c
,
김 종건d
,
김 동진e
,
홍 은미f†
aMaster Course Student, Department of Environment Sciences, Kangwon National University
bUndergraduate Student, Department of Eco Environment Sciences, Kangwon National University
cAssistant Professor, Department of Regional Infrastructure Engineering, Kangwon National University
dAssistant Professor, Department of Regional Infrastructure Engineering, Kangwon National University
eResearcher, Wonju Regional Environmental Management Office
fAssistant Professor, School of Natural Resources and Environmental Science, Kangwon National University
a강원 국립 대학교 환경 과학 과 석사 연구생
b강원 국립 대학교 생태 환경 과학 과 학부생
c강원 국립 대 지역 인 프 라 공학 과 조교수
d강원 국립 대 지역 인 프 라 공학 과 조교수
e원주 환경 관리 사무실 연구원
f강원 국립 대 자연 자원 과 환경 과학 대 조교수
† Corresponding author Tel.: +82-33-250-8571, Fax: +82-33-259-5563 E-mail: eunmi.hong@kangwon.ac.kr
2020. pp. 15-26
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Abstract

There are fifteen non-point pollution management areas in Korea and three of them (Doam lake, Daegi district and Golji-cheon) are located in the upstream of the Namhan river watershed. Many efforts to reduce non-point sources (NPS) pollution have been conducted, however, water quality pollution in the watershed is still serious. To solve these problems, it is a priority to grasp water quality using statistical techniques. In this study, a trend analysis was conducted to evaluate the effect of NPS management in the watershed. The long-term trends from 1996 to 2018 of water quality properties were analyzed using data collected from the water environment information system. Seventeen monitoring stations were selected along the main stream in Namhan river basin. Monthly water quality properties (BOD, COD, TN, TP, TN/TP ratio, Conductivity, SS and Chlorophyll-a) were collected and analyzed by Mann-Kendall test and LOWESS. The results showed that the Conductivity tended to increase in all regions and was the highest level in Jijangcheon. Organic pollution such as BOD and COD tended to increase in the Jungseon area. SS did not show a large tendency, but it showed high concentration in the Doam watershed. In all regions, 40% of water quality properties showed a tendency to ‘UP’, 15% of water quality properties tended to ‘DOWN’, and 46% indicated no tendency. In order to determine the cause of this, additional research and measures for improvement are necessary. This study will be used for the establishment of water quality policy in the future.

Keywords
Namhan river watershed
seasonal Mann-Kendall test
LOWESS test
trend analysis
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Information
  • Publisher :The Korean Society of Agricultural Engineers
  • Publisher(Ko) :한국농공학회
  • Journal Title :Journal of Korean Society of Agricultural Engineers
  • Journal Title(Ko) :한국농공학회논문집
  • Volume : 62
  • No :5
  • Pages :15-26
  • Received Date : 2020-06-08
  • Revised Date : 2020-08-13
  • Accepted Date : 2020-08-13
  • DOI :https://doi.org/10.5389/KSAE.2020.62.5.015
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