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Environmental Engineering Research 2018;23(2): 150-158. DOI: https://doi.org/10.4491/eer.2017.067
Evaluation of the tributaries by influence index on the mid-lower portion of the Nakdong River basin
Shun-Hwa Lee1, Seung-Gyu Jung1, Seoung-Muk Park1, and Byung-Dae Lee2 
1Department of Environmental Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
2Department of Health Management, Uiduk University, Gyeongju 38004, Republic of Korea
Corresponding Author: Byung-Dae Lee ,Tel: +82-54-760-1702, Fax: +82-54-760-1179, Email: bdlee@uu.ac.kr
Received: May 23, 2017;  Accepted: December 18, 2017.
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The deteriorating role of Nakdong River due to the Four Major Rivers Project has caused a series of problems, including water pollution, drying streams, aggravation of the hydroecology. Geumho River and Gyeongseong-cheon had a higher concentration index and is believed to impact the water quality of the main stream. The influence index of Geumho River and Nam River between 2015 and 2016, which have a large amount of discharge, was the highest among the tributaries in terms of the load material balance. Showing the highest average concentration and average load in the index assessment, Geumho River is believed to require an intensive management for improving the water quality of the main stream. Furthermore, when the cumulative percentage of the average concentration and average load was compared based on the water quality improvement of the tributaries mixed to Nakdong River, which was set to 60%, Geumho River, Nam River, Topyeong-cheon, and Cha-cheon, which showed the highest ratio in that order, were determined to require a water quality management program as a priority.
Keywords: Effect of tributaries | Index assessment | Load mass balance | Water quality of Nakdong River
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