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조기안,위인선,최청일 ( Ki An Cho,In Sun Wui,Chung Il Choi ) 한국환경생물학회 1994 환경생물 : 환경생물학회지 Vol.12 No.2
Studies on physico-chemical factors and phytoplankon were conducted in the Kwang yang Bay from September 1986 to June 1987; Results are as followes; water temperature was varied from 5.0℃ to 24.0℃,; dissolved oxygen (D.O) from 7.21㎎/ℓ, to 14.80㎎/ℓ with an annual average of 10.11㎎/ℓ; salinities was from 23.0‰ to 34.0‰ with an annual average of 29.5‰ ; pH range was from 7.4 to 8.0 with an annual average of 7.8; suspended solides (S.S) was from 9.00㎎/ℓ to 34.08㎎/ℓ with an annual average of 20.27㎎/ℓ; particulate organic matters (POM) was from 1.31㎎/ℓ to 24.71㎎/ℓ with an annual average of 5.77㎎/ℓ; transparency was the range of from 1.0 to 5.1m. ; ammonia was from 0.20㎍/ℓ to 4.50㎍/ℓ; nitrite was from 0.06㎍/ℓ to 9.35㎍/ℓ; phosphate was from 1.68㎍/ℓ to 137.20㎍/ℓ . Phytoplankton species were identified total 137 taxa composed of 4 phylum, 10 class, 24 order, 24 family, 11 var. species, the succession of dominant species was showed Chaetocerous curvisetes in November, Eucampia zoodiacus in Febulary, Stephanopyxis nipponica in April and Rhizossolnia stolterforthii in June. Phytoplankton standing crop was from 71 to 1,521×10 exp (3) cells/ℓ with an annual mean of 333×10 exp (3)cells/ℓ.
인공호소인 영산호의 용존산소 분포와 수층 성층구조의 연관성 분석
송은숙 ( Eun Sook Song ),조기안 ( Ki An Cho ),신용식 ( Yong Sik Shin ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.2
The Youngsan Lake was constructed to supply agricultural water to the extensive rice fields in the basin of the lake in 1981. Hypoxia has often developed in the bottom water of the lake during the warm season although the water depth is relatively shallow (< 16 m). We investigated the spatial and temporal variations of dissolved oxygen (DO) and physical properties such as water temperature, salinity and turbidity to elucidate the effects of change in physical properties on DO dynamics in the lake. Vertical profiles of DO, temperature, salinity, and water density were also explored to verify the development of stratification in relation to DO variation in the water column. Hypoxia (DO < 2 mg L-1) was not observed in the upper regions whereas hypoxia was detected in the lower regions during the warm season. Thermocline generally developed in the lower regions during the warm season unlike the previous studies in which no thermocline was observed. However, water column was well mixed when freshwater water was discharged from the reservoir through the sluice gate of the dike. DO concentrations also decreased when halocline or pycnocline developed during the dry season suggesting that the vertical stratification of water column affects DO dynamics although the water depth is shallow in the Youngsan lake.
박용우 ( Yong Woo Park ),조기안 ( Ki An Cho ),조철 ( Cheol Cho ) 한국물환경학회 2008 한국물환경학회지 Vol.24 No.1
To recognize the spatial and temporal variability of water temperature and dissolved oxygen in the Youngsan reservoir formed after dike construction, water temperature and dissolved oxygen data have been observed and analyzed from April, 2002 until March, 2003. As the results, certain stratifications were not distinctly observed in the Youngsan reservoir during summer, which was estimated due to the drainage characteristic from the Youngsan water gates. The yearly variation of water temperature in the Youngsan reservoir is shown seasonally ups and downs by the heat exchange between the atmosphere and the reservoir. On the other hand, dissolved oxygen and water temperature in the Youngsan reservoir have been shown inversed proportional correlation. As the calculation results of residence time and water exchange rate, it is considered that the feature of oxygen distribution is determined by the drainage characteristics caused the shortest residence time during summer, which also disturbed the formation of stratification in the Youngsan reservoir.