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KMID : 1024520200290121249
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Journal of the Environmental Sciences
2020 Volume.29 No. 12 p.1249 ~ p.1260
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Method for Calculating the Pollution Load Amount of Agricultural Non-Point Sources Using Land Cover Map
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Yu Ji-Eun
Sung Hyun-Chan
Kim Yoon-Ji
Lee Kyung-Il
Choi Ji-Yong
Jeon Seung-Woo
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Abstract
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Non-point source pollutants have characteristics the render them difficult to manage owing to the uncertainty of flow paths. As agricultural non-point sources account for more than 57% of non-point source pollutants, the necessity for management is increasing. This study examines the possibility of utilizing land cover maps to suggest a more appropriate method of setting management priority for agricultural non-point sources in the Daecheong Lake area and draws implications by comparing the results derived using the cadastral map, as mentioned in the TMDL Basic Policy. To define the prioritized areas for management, the pollution load was calculated for each subbasin using the formula from the TMDL technical guidelines. As a result, the difference in the average pollution load between the land cover map and cadastral map ranged from 11.6% to 21% among the subbasins. In almost all subbasins, there were differences in the ranking of management priorities depending on the land information that was used. In addition, it was found that it was reasonable to use the level 3 land cover map to calculate the load generated by the land system for examining the implementation goals and methods of each data and comparing them with satellite images.
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KEYWORD
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Land cover map, Pollution load amount, Daecheong lake area, Agricultural non-point source
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