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허우명,김범철 한국환경과학회 1995 한국환경과학회지 Vol.4 No.3
Phosphorus and nitrogen loadings from the main tributaries into the Nakdong River were estimated by measuring phosphorus and nitrogen concentration in the main tributaries, Nakdong River(Kangjung), Kumho River, Heichun, Hwang River, Nam River, Milyang River, and Yangsanchun from May 1994 to October. Total phosphorus concentration of Kumho River was vary high, average 1.0 ㎎P/ℓ. The other rivers were the range 0.05∼0.15 ㎎P/ℓ. Total nitrogen concentration of Kumho River was vary high, average 6.27 ㎎N/ℓ. The other rivers were the range 1.5∼3.0 ㎎N/ℓ. The phosphorus loading from Kumho River, Nakdong River(Kangjung), Nam River, Milyang River, Hwang River, Yangsanchun, and Heichun were calculated to be 1,108, 603, 198, 57, 34, 23, and 21 tP/yr, respectively. Therefore, the loading from Kumho River accounted for 45 % of total loading, 2,042 tP/yr. The nitrogen loading from Nakdong River (Kangjung), Kumho River, Nam River, Milyang River, Hwang River, Heichun, and Yangsanchun were calculated to be 12,636, 7,411, 2,611, 1,523, 779, 608, and 391 tN/yr, respectively. Therefore, the loading from Nakdong River(Kangjung) and Kumho River accounted for 50 % and 30% of total loading, 25,959 tN/yr, respectively.
허우명,김범철,황길순,최광순,박원규 江原大學校 附設 環境硏究所 1996 環境硏究 Vol.13 No.-
The longitudinal variations of water quality along the mainstream of the Nak-ding River from May 1994 to October was surveyed by the measurement of chl-orophyll a, total phosphorus, total nitrogen, dissolved inorganic phosphorus, nitrate-nitrogen, ammonia-nitrogen concentration, and secchi disc transparancy. Chl. a, TP, TN, DIP, NO_(3) and NH_(3)-N concentration was maintained at high level during the investigation period. And they also showed the peak after the input of Kumho River. Chl. a concentration was increased from 14.2㎎/㎥ in May to 95.2 in October. TP ane TN concentration was maintained always above 100㎎/㎥ and 3~4㎎N/l, respectively. TN/TP ratio were less than 16 from June to September with a few exceptions. Therefore, nitrogen is the limit-ing nutrient in the Nakdong River. Trophic states were in the range of eutrophic to hypertrophic, from 60 to80.
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,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 유역과 가두리로부터의 인부하량 및 인수지 : Phosphorus Budget
허우명,김범철,안태석,이기종 江原大學校 附設 環境硏究所 1993 環境硏究 Vol.10 No.-
Phosphorus loading into Lake Soyang was estimated by determining phosphorus input via runoff of drainage basin and the phosphorus discharge from floating-net fishfarms within the lake. The loading from drainage basin was determined by measur-ing total phosphorus concentration in the main inflowing stream, Syang River, from July 1990 to May 1992. Because the total phosphorus concentration and the flow rate of Soyang River was high in flood period, most of phosphorus loading was concentrated in rainy season. Phosphorus discharge of fishfarms was estimated from the amount of fishfeed applied annually and the unit rate of phosphorus excretion per feed weight. The loading from the watershed and fishfarms were calculated to be 104 and 48 tP/yr, respectively. Both combined, the phosphorus loading of Lake Soyang far exceeded the critical loading for eutrophication. The amount of phosphorus was 0.59.
허우명,김범철,김윤희 江原大學校 附設 環境硏究所 1999 環境硏究 Vol.16 No.-
The seasonal variation of phosphorus loading into the Lake Dalbang was surveyed in the three streams (Daibang, Seohak, and Shinhung stream), at 1~2 week intervals from April 1994 to March 1995. Also, the variation of phosphorus concentration during storm runoff was surveyed at the shorter intervals of 5~8 hours from October 10 to 22. The average of total phosphorus (TP) concentration in three inflowing water was 7.7 (Dalbang stream), 19.4 (Seohak stream), 40.0 (Shinhung stream) ㎎P/㎥. In addition, during the storm periods (October, 12, 1994) the average TP concentration was 98 (Dalbang stream), 190 (Seohak stream), 1,336 (Shinhung stream) ㎎P/㎥. Shinhung watershed was major pollution sources, since that area has about 70% of total phosphorus generation. Because the TP concentration and the flow rate of the three inflowing waters were high during the flood period, most of annual phosphorus loading was concentrated in several episodic storm runoff. TP loading from the watersheds was calculated to be 236.9 ㎏P/yr. TP loading during the rainy season (October and November) accounted for about 71% of TP loading of Lake Dalbang. TP loading from the Dalbang, Seohak and Shinhung watersheds were calculated to be 21.0, 64.1, and 151.9 ㎏P/yr, respectively. The delivery ratio of TP was 10.7.