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2022 Vol.44, Issue 1

Article

Characteristics of Water Quality and Chlorophyll-a in the Seawater Zone of the Yeongsan River Estuary: Long-term (2009–2018) Data Analysis

영산강 하구 해수역의 수질 및 식물플랑크톤 생체량(chlorophyll-a) 변동 특성: 장기(2009–2018년) 자료 분석

Sangjun Park1
,
Yongsik Sin1*
박 상준1
,
신 용식1*
1Department Ocean System Engineering, General Graduate School, Mokpo National Maritime University, Mokpo 58628, Korea
1국립목포해양대학교 일반대학원 해양시스템공학과 (58628) 전라남도 목포시 해양대학로 91
*Corresponding Author
30 March 2022. pp. 13-27
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Abstract

The Yeongsan River estuary was altered by a sea dike built in 1981 and the sluice gates in the dike were extended recently in 2014. The construction has caused changes in water properties and hydrodynamics and also produced disturbances including hypoxia and algal blooms. We analyzed the water quality and chlorophyll-a data (2009–2018) collected seasonally at 3 stations (Sts. 1–3) along the channel of the estuary by the Marine Environmental Monitoring System. Variations in water quality and chlorophyll-a (an index of phytoplankton biomass) were examined and their stressors were also identified by statistics including correlation and multivariate principal component analyses (PCA). The water quality was mainly affected by freshwater discharge from the dike. Salinity, nutrients and chlorophyll-a were especially affected by the discharge and the effect enhanced during summer and at the upper region near the sea dike decreasing downstream. Three factors were extracted for each station in the PCA accounting for 66.07–72.42% of the variations. The first was an external factor associated with freshwater discharge and the second and third were seasonal or biological factors. The results indicate that the water quality is more affected by short-termed and episodic events such as freshwater discharge than seasonal events and the influence of freshwater discharge on water quality is more extensive than that previously reported. This suggests that the boundary of the estuary should be extended to take into account the findings of this study and a management strategy linked to the freshwater zone is required to manage the integrity and water quality of the Yeongsan River estuary.

Keywords
Yeongsan River estuary
chlorophyll-a
water quality
principal component analysis
long-term data
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Information
  • Publisher :Korea Institute of Ocean Science and Technology
  • Publisher(Ko) :한국해양과학기술원
  • Journal Title :Ocean and Polar Research
  • Journal Title(Ko) :Ocean and Polar Research
  • Volume : 44
  • No :1
  • Pages :13-27
  • Received Date : 2021-08-24
  • Revised Date : 2021-12-29
  • Accepted Date : 2021-12-30
  • DOI :https://doi.org/10.4217/OPR.2022001
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