Journal of Environmental Impact Assessment (환경영향평가)

Korean Society of Environmental Impact Assessment (한국환경영향평가학회)
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Analysis of Load Duration Curve Using Long Time Flow Measurement Data of Kyeongancheon

장기간 유량측정 자료를 이용한 경안천의 부하지속곡선 특성

  • Noh, Changwan (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Kwon, Phil-Sang (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Jung, Woo-Seok (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Lee, Myung-Gu (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Cho, Yong-Chul (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Yu, Soonju (Han River Environment Research Center, National Institute of Environmental Research)
  • 노창완 (국립환경과학원 한강물환경연구소) ;
  • 권필상 (국립환경과학원 한강물환경연구소) ;
  • 정우석 (국립환경과학원 한강물환경연구소) ;
  • 이명구 (국립환경과학원 한강물환경연구소) ;
  • 조용철 (국립환경과학원 한강물환경연구소) ;
  • 유순주 (국립환경과학원 한강물환경연구소)
  • Received : 2018.11.02
  • Accepted : 2019.01.15
  • Published : 2019.02.28
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Abstract

Long term flow measurement and water quality analysis data need to determine the target and allowable load for each basin in Total Water Pollution Load Management System (TWPLMS). The Load Duration Curve (LDC) is analyzed the relationship between flow data and water quality, and evaluates the pollutant load characterization by flow conditions. LDC of Kyeongancheon is created by the Flow Duration Curve (FDC) that was analyzed 8-day interval measured flow data from 2006 to 2015 and numeric water quality target in Kyeongancheon. As a result of this study, it is necessary to manage the point source pollutant because the numeric water quality target is not satisfied in the low flows. Also the numeric water quality target has been exceed for four months from March to June of the year and continuous and systematic watershed management is required to satisfy the numeric water quality target.

장기간 유량측정과 수질분석은 수질오염총량관리제도 유역의 목표수질과 허용 부하량을 결정하기 위하여 필요하다. 목표수질 달성여부를 평가하는데 사용되는 부하지속곡선은 유량과 수질간의 관계를 설명하고, 유량조건별 오염부하량 특성을 평가한다. 경안천의 부하지속곡선은 경안천 목표수질과 2006년부터 2015년까지 연평균 8일 간격으로 측정한 유량자료를 이용한 유량지속곡선에 의해서 작성되었다. 연구결과 경안천은 갈수량 구간에서 목표수질을 초과하여 점오염원에 대한 관리가 필요한 것으로 분석되었다. 또한, 연중 3월에서 6월 사이의 기간 동안에만 목표수질을 초과하는 것으로 나타나 이 기간 동안 경안천의 목표수질을 달성하기 위한 체계적인 유역 관리가 필요한 것으로 판단된다.

Keywords

HOPHBL_2019_v28n1_35_f0001.png 이미지

Figure 1. Map of Kyeongancheon watershed

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Figure 2. Thiessen of Thiessen of Han River basin

HOPHBL_2019_v28n1_35_f0003.png 이미지

Figure 3. Monthly precipitation by Thiessen weight method on the watershed

HOPHBL_2019_v28n1_35_f0004.png 이미지

Figure 4. Flow duration curve of Kyeongancheon

HOPHBL_2019_v28n1_35_f0005.png 이미지

Figure 5. Load duration curve of Kyeongancheon

HOPHBL_2019_v28n1_35_f0006.png 이미지

Table 6. Hydrologic condition considerations (H : High, M : Middle)

HOPHBL_2019_v28n1_35_f0007.png 이미지

Figure 6. BOD Yearly load duration curve (2006-2015)

HOPHBL_2019_v28n1_35_f0008.png 이미지

Figure 7. T-P Yearly load duration curve (2006-2015)

HOPHBL_2019_v28n1_35_f0009.png 이미지

Figure 8. BOD Monthly load duration curve (a) Jul.-Feb. (b) Mar.-Jun.

Table 1. Precipitation by Thiessen weights method

HOPHBL_2019_v28n1_35_t0001.png 이미지

Table 2. Flow rate in Kyeongancheon (2006-2015)

HOPHBL_2019_v28n1_35_t0002.png 이미지

Table 4. The number of measurement and excess rate by hydrologic conditions (BOD)

HOPHBL_2019_v28n1_35_t0003.png 이미지

Table 3. Classifications of hydrologic condition

HOPHBL_2019_v28n1_35_t0004.png 이미지

Table 4. Continued

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Table 5. The number of measurement and excess rate by hydrologic conditions (T-P)

HOPHBL_2019_v28n1_35_t0007.png 이미지

Table 7. The number of LDC exceeded and excess rate by monthly conditions

HOPHBL_2019_v28n1_35_t0009.png 이미지

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