한국농공학회논문집 (Journal of The Korean Society of Agricultural Engineers)

  • 제61권3호
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  • Pages.15-22
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  • 2019
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  • 1738-3692(pISSN)
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  • 2093-7709(eISSN)
한국농공학회 (The Korean Society of Agricultural Engineers)
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비점오염 발생 원단위 산정방법에 대한 고찰 - 논 비점오염 원단위를 중심으로 -

A Study on the Estimation Methods of Nonpoint Pollutant Unit Load - Focus on Nonpoint Pollutant Unit Load in Paddy Field -

  • Choi, DongHo (Division of Climate Change and Agroecology, Department of Agricultural Environment, National Institute of Agricultural Sciences (NAS), Rural Development Administration (RDA)) ;
  • Choi, Soon-Kun (Division of Climate Change and Agroecology, Department of Agricultural Environment, National Institute of Agricultural Sciences (NAS), Rural Development Administration (RDA)) ;
  • Kim, Min-Kyeong (International Technology Cooperation Center (ITCC), Rural Development Administration (RDA)) ;
  • Hur, Seung-Oh (Division of Climate Change and Agroecology, Department of Agricultural Environment, National Institute of Agricultural Sciences (NAS), Rural Development Administration (RDA)) ;
  • Hong, Sung Chang (Division of Climate Change and Agroecology, Department of Agricultural Environment, National Institute of Agricultural Sciences (NAS), Rural Development Administration (RDA)) ;
  • Yeob, So-Jin (Division of Climate Change and Agroecology, Department of Agricultural Environment, National Institute of Agricultural Sciences (NAS), Rural Development Administration (RDA)) ;
  • Yoon, KwangSik (Department of Rural and Bio-systems Engineering, Chonnam National University)
  • 투고 : 2019.03.06
  • 심사 : 2019.04.03
  • 발행 : 2019.05.31
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초록

In order to preserve water environment, Total Maximum Daily Load(TMDL) is used to manage the total amount of pollutant from various sources, and the annual average load of source is calculated by the unit load method. Determination of the unit load requires reliable data accumulation and analysis based on a reasonable estimation method. In this study, we propose a revised unit load estimation method by analyzing the unit load calculation procedure of National Institute of Environment Research(NIER) method. Both methods were tested using observed runoff ratio and water quality data of rice paddy fields. The estimated values with the respective NIER and revised NIER methods were highly correlated each other. However, the Event Mean Concentration(EMC) and the runoff ratio considered in the NIER method appeared to be influenced by rainfall classes, and the difference in unit load increases as the runoff and EMC increase. The error can be further increased when the EMC and runoff ratio are changed according to changes in rainfall patterns by climate change and change of agricultural activities. Therefore, it is recommended to calculate unit load by applying the revised NIER method reflecting the non point pollution runoff characteristics for different rainfall classes.

키워드

NGHHCI_2019_v61n3_15_f0001.png 이미지

Fig. 1 Schematic diagram of the study area and the locations of instruments for measurement of water balance(Choi et al., 2015)

NGHHCI_2019_v61n3_15_f0002.png 이미지

Fig. 3 The representative runoff ratio and EMCs by estimated NIER method

NGHHCI_2019_v61n3_15_f0003.png 이미지

Fig. 4 Unit load of water quality constituents determinated by NIER and r_NIER method and applied rainfall periods(rainfall period 1 : 1981-1990; rainfall period 2 : 1991-2000; rainfall period 3: 2001-2010)

NGHHCI_2019_v61n3_15_f0004.png 이미지

Fig. 2 (a) A comparison of NIER and r_NIER methods for BOD unit load. (b) Difference of BOD unit load (△ unit load = |NIER unit load - r_NIER unit load|) was affected by RMSE (root mean square error) of event mean concentration by rainfall level (EMCy) and (c) that of runoff ratio by rainfall level (Ry) but (d) was not affected by that of rainfall ratio by rainfall level

Table 1 The variation of rainfall and rainfall factor by rainfall application periods

NGHHCI_2019_v61n3_15_t0001.png 이미지

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