Long-term Trends of Summer Season of Water Quality in Lake Doam.

Kwak, Sungjin; DevBhattrai, Bal; Lee, Changkeun; Heo, Woo-Myung

doi:10.11614/ksl.2013.46.1.128

Cited by 3 publications

(1 citation statement)

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“…Pollutant discharges from point sources (domestic wastewater and wastewater treatment plants) and non-point sources (agricultural, urban runoff, and forest) have been a big concern for Lake Doam. Long-term trends of summer season water quality by Kwak et al (2013) showed that Lake Doam was a mesoeutrophic lake where the average values of chlorophyll-a (Chl-a), total nitrogen (TN), and total phosphorus (TP) were 11.8 mg m , respectively.…”

Section: Introductionmentioning

confidence: 99%

Assessment of water quality variations under non-rainy and rainy conditions by principal component analysis techniques in Lake Doam watershed, Korea

Bhattrai¹,

Kwak²,

Heo

2015

J. Ecol. Environ.

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This study was based on water quality data of the Lake Doam watershed, monitored from 2010 to 2013 at eight different sites with multiple physiochemical parameters. The dataset was divided into two sub-datasets, namely, non-rainy and rainy. Principal component analysis (PCA) and factor analysis (FA) techniques were applied to evaluate seasonal correlations of water quality parameters and extract the most significant parameters influencing stream water quality. The first five principal components identified by PCA techniques explained greater than 80% of the total variance for both datasets. PCA and FA results indicated that total nitrogen, nitrate nitrogen, total phosphorus, and dissolved inorganic phosphorus were the most significant parameters under the non-rainy condition. This indicates that organic and inorganic pollutants loads in the streams can be related to discharges from point sources (domestic discharges) and non-point sources (agriculture, forest) of pollution. During the rainy period, turbidity, suspended solids, nitrate nitrogen, and dissolved inorganic phosphorus were identified as the most significant parameters. Physical parameters, suspended solids, and turbidity, are related to soil erosion and runoff from the basin. Organic and inorganic pollutants during the rainy period can be linked to decayed matters, manure, and inorganic fertilizers used in farming. Thus, the results of this study suggest that principal component analysis techniques are useful for analysis and interpretation of data and identification of pollution factors, which are valuable for understanding seasonal variations in water quality for effective management.

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Section: Introductionmentioning

confidence: 99%