Winter Algal Bloom and Spatial Characteristics of Water Quality in the Lower Taewha River, Ulsan, Korea

Sohn, Eun Rak; Park, Jung Im; Lee, Bora; Lee, Jin Woo; Kim, Jongseol

doi:10.7845/kjm.2013.262

Cited by 5 publications

(8 citation statements)

References 10 publications

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“…Cryptomonas spp. dominated at most stations (Figure 8b) in this study; these results are similar to a previous study [25] in which Cryptomonas sp. dominated near U3 in December 2010 (winter season).…”

Section: Phytoplankton Population and Dominant Speciessupporting

confidence: 92%

“…Chl.a concentrations were in the 0.95-127.20 μg L −1 range (average: 13.64±34.34 μg L −1 ) in November and the highest value was 127.20 μg L −1 at U2. As mentioned in the Introduction, nontoxic algal blooms dominated by Cryptomonads occur in the upper estuary (U2-U4) during the dry seasons (November-May) in the Taehwa estuary [24][25][26]. We also observed an algal bloom in a small area in November; therefore, the chl.a concentrations were high in that area.…”

Section: Nutrientsmentioning

confidence: 56%

“…Some studies have been conducted on algal blooms in the Taehwa River estuary, with most focusing on the Ulsan Bay (the Taehwa River flows into the Ulsan Bay). The main factors that influence the occurrence of algal blooms are considered to be precipitation and flow rate [24], small streams, and sewage drains connected to the Taehwa River [25]. These studies mainly focused on algal blooms in the Taehwa River that occur in the winter.…”

Section: Introductionmentioning

confidence: 99%

“…Algal blooms that were mainly dominated by non-toxic cryptomonads occurred in the Taehwa River during the dry season (November to April [26]). Other studies suggest that algal blooms may also occur during the winter season, although algal bloom outbreaks mainly occur during the spring and summer seasons [25]. The objective of this study is to analyze the causes of seasonal algal blooms by evaluating key water characteristics based on the physical environment.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal Distributions of Phytoplankton and Environmental Factors Generate Algal Blooms in the Taehwa River, South Korea

Sim

Kim

et al. 2020

Water

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Algal blooms have occurred in the Taehwa River estuary in South Korea despite the improvement of water quality since environmental renewal projects in the 1990s. In this study, we investigated the causes of algal blooms by measuring the water retention time using a floating buoy, water quality parameters, and phytoplankton distribution data from 2012. An algal bloom did not occur in February because of phosphate limitations in the Taehwa River estuary; however, the concentration of nutrients in the water inflow from the basin triggered a significant algal bloom in the upper estuary in the month of May. In this regard, the phytoplankton population was dominated by nano- and pico-sized flagellates. In August, the freshwater inflow into the estuary greatly increased due to heavy rainfall, resulting in a shorter retention time of the water bodies, which seemed to prevent an algal bloom. In November, a bloom of Cryptophyceae occurred at one of the sites (the U2 site) due to sufficient nutrients in the water and the long retention times of the water bodies. Our results indicate that a decrease in the nutrients (N and P) supplied from the basin is required for a reduction in algal blooms in the Taehwa River estuary. Additional studies are needed to further elucidate the effects of the land-based, nutrient-rich pollutants flowing into the Taehwa River estuary on algal bloom generation considering the fact that the streams have different environmental characteristics.

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Section: Phytoplankton Population and Dominant Speciessupporting

confidence: 92%

Section: Nutrientsmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Seasonal Distributions of Phytoplankton and Environmental Factors Generate Algal Blooms in the Taehwa River, South Korea

Sim

Kim

et al. 2020

Water

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“…In the downstream region of the Taehwa-gang mid-level basin, unusual green tides have sometimes occurred due to the formation of stagnant water in the downstream area and the deterioration of the basin's self-purification ability due to the decrease of flow rate during the drought flow period and the influx of saline water due to the influence of seawater (Sohn et al, 2013). Although the Taehwa-gang mid-level basin achieved the target water quality in 2015, it is necessary to newly establish or change the water quality monitoring representative point of this mid-level basin to other point where the stagnant and reverse flow does not occur.…”

Section: Assessment Ofmentioning

confidence: 99%

Assessment of Nakdong River Basin Management: Target Water Quality Achievement and Future Challenges

Hwan¹,

Kim²,

Hyeonjin³

et al. 2020

J. Korean Soc. Hazard Mitig

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In 2006, the Korean Ministry of Environment established <The 1st Water Environment Management Master Plan>. The plan aimed at “Clean Water, Eco River 2015” and guided water quality protection and strengthened water management. This study evaluated the achievement of the target water quality among the 33 mid-level basins in the Nakdong River basin and assessments of the causes of non-achievement of the target water quality by mid-level basins. According to the 2015 water quality data, only 16 of the 33 mid-level basins achieved the target water quality. The low achievement of the target water quality was attributed to the failure to predict the pollutant load at the time of planning, problems with the management of tributaries, implementation of the <Four major river restoration project>, and problems with the representativeness of the water quality representative points. In addition, feasibility studies on the water quality monitoring representative point used in each mid-level basin were also performed; some mid-level basins required improvement or change of the representative points. This study also suggested further research to improve water quality, such as detailed studies of the management of pollutant load, mainstream tributaries, and water quality indicators, for the revision of the current ongoing <The 2nd Water Environment Management Master Plan>.

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A Study on Instream Flow for Water Quality Improvement in Lower Watershed of Nam River Dam

Kim¹,

Jung²,

Lee³

et al. 2014

Journal of Korean Society on Water Environment

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Despite the implementation of TMDL, the water quality in lower watershed of Nam river dam has worsened continuously since 2005. Multifarious pollution sources such as cities and industrial districts are scattered around it. Nam river downstream bed slope is very gentle towards the downstream water flow of slows it down even more, depending on the water quality deterioration is accelerated eutrophication occurs. In this study, the mainstream in lower watershed of Nam river dam region to target aquatic organic matter by phytoplankton growth contribution was evaluated by statistical analysis. and statistical evaluation of water quality and the accuracy of forecasting, model calibration and verification procedures by completing QUALKO2 it's eutrophic phenomena that occur frequently in the dam outflow through scenarios predict an increase in water quality management plans to present the best should.

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Winter Algal Bloom and Spatial Characteristics of Water Quality in the Lower Taewha River, Ulsan, Korea

Abstract: This study was carried out to assess the spatial and tidal effects on the water quality in the lower reaches of Taewha River, Ulsan, Korea and to understand the environmental factors affecting winter algal bloom in the river.

Cited by 5 publications

References 10 publications

Seasonal Distributions of Phytoplankton and Environmental Factors Generate Algal Blooms in the Taehwa River, South Korea

Seasonal Distributions of Phytoplankton and Environmental Factors Generate Algal Blooms in the Taehwa River, South Korea

Assessment of Nakdong River Basin Management: Target Water Quality Achievement and Future Challenges

A Study on Instream Flow for Water Quality Improvement in Lower Watershed of Nam River Dam

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