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http://dx.doi.org/10.7837/kosomes.2019.25.1.089

Effect of Freshwater Discharge on the Nakdong River Estuary: Mooring Observations of Water Temperature and Salinity  

Kim, Sangil (Ocean Climate & Ecology Research Division, National Institute of Fisheries Science)
Youn, Seok-Hyun (Ocean Climate & Ecology Research Division, National Institute of Fisheries Science)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.25, no.1, 2019 , pp. 89-95 More about this Journal
Abstract
Mooring observations of water temperature and salinity were conducted to investigate the effects of freshwater discharge patterns on the mouth of Nakdong River from April 2017 to March 2018. More than $500-1000m^3\;s^{-1}\;d^{-1}$ of freshwater was frequently discharged into the estuary throughout the rainy season, but less than $200m^3\;s^{-1}\;d^{-1}$ was discharged through the normal season. Sluice gates of the estuarine barrage operated depending on the tide level during spring tide, but they were constantly open during neap tide. Water temperature and salinity fluctuated regularly with intermittent discharges of freshwater, whereas they were stable while freshwater discharge was continuous. Mean salinity was 29 during the study period. Salinity exceeded the mean value in the normal season and rapidly recovered after a temporary reduction. In contrast, water with salinity below the mean value prevailed in the estuary for three months over the rainy season. These results indicate that water temperature and salinity were affected by the amount of freshwater discharge, as well as the frequency of discharge on a large scale and the time over which the freshwater discharge continued.
Keywords
Salinity; Sea surface temperature; Nakdong River Estuary; Freshwater discharge; Mooring;
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Times Cited By KSCI : 3  (Citation Analysis)
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