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허우명,권상용,김범철,박주현 江原大學校 附設 環境硏究所 2000 環境硏究 Vol.17 No.-
Water quality parameters were surveyed in Lake Andong. Turbidity, temperature, secchi disc transparency (SD), phosphorus, nitrogen and chlorophyll ? concen-tration were measured at dam site from July 1993 to December 1998. Minimum transparency in summer was only about 2 meters in 1993 and 1994, but it decreased to about 1 meter in 1997 and 1988. Total phosphorus concentration of the epilimnion increased slightly from 11~30 ㎎P/㎥ in 1993 to 18~42 ㎎P/㎥ in 1998. Total nitrogen concentration of the epilimnion decreased slightly from 1.81~2.96㎎N/L in 1993 to 1.48~2.57 ㎎N/L in 1998. TN/TP weight ratio decreased from 82~281 in 1993 to 21~143 in 1998 due to the increase of phosphorus concentration and the decrease of nitrogen concentration. Dissolved inorganic phosphorus and nitrate nitrogen concentration of the epilimnion were in the range of 0.9~5.3 ㎎P/㎥ and 1.36~1.68㎎N/L, respectively. Chlorophyll ? concentration in summer was in the range of 11.0~19.1 ㎎P/㎥ in 1994, 1996 and 1997, but it decreased to 2.3~6.5 ㎎/㎥ in 1998. Trophic atate of Lake Andong can be classified as mesotrophic to eutrophic from TP, TN and chlorophyll ? concentration.
소양호 부영양화에 따른 N/P비의 변화와 남조류 Bloom
허우명,김범철,조규송 江原大學校 附設 環境硏究所 1992 環境硏究 Vol.9 No.-
After the first advent in 1986 two species of Anabaena spiroides and A. macrospora showed increasing dominacy year by year, which is thought to be enhanced by the increase of phosphorus concentration and the decrease of N/P ratio caused mainly by the phosphorus discharge from fishfarms within the lake. The bluegreen algal bloom in a water without nitrogen depletion is the unique feature in Lake Soyang. Nitratenitrogen was maintained always above 0.5mg N/l throughout the year, though the NO3T/TP ratio decreased from 100 in 1984 to 50 in 1990 due to the increase of phosphorus content. High nitrogen concentration and scarcity of gererocyst in trichomes of Anabaena implies that nitrogen fixing ability is not critical for the bluegreen algal dominance in Lake Soyang. In the bag cultivation of Anabaene, the number of heterocysts increased with the addition of phosphorus which induced nitrogen depletion and the reduction of N/P ratio through algal growth.
허우명,Bal Dev Bhattrai,Sungjin Kwak 한국생태학회 2015 Journal of Ecology and Environment Vol.38 No.2
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 correla¬tions 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 data¬sets. PCA and FA results indicated that total nitrogen, nitrate nitrogen, total phosphorus, and dissolved inorganic phos¬phorus 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 dis¬solved 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