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- 저자 : 김범철(Kim, Bumcheol) (검색결과 267 건)
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김범철,조규송 ( Bom Chul Kim,Kyu Song Cho ) 한국하천호수학회 1989 생태와 환경 Vol.22 No.3
The seasonal and vertical dissolved oxygen distributions were surveyed from July 1985 to July 1989 in a warm monomictic dendritic-shape reservoir, Lake Soyang. DO content showed the general trend of decrease from year to year, implying the advance of eutrophication. Hypolimnetic anoxic zone began to develop in 1988 reaching upto 15 m from the bottom, which is an epoch-making event in Lake Soyang, well-known as a clear oligotrophic lake until early 1980s. In anoxic zone phosphate and ammonia concentration were very high, and nitrate depleted, which is expected to accelerate eutrophication of Lake Soyang. Insufficient cooling of surface waters in warm winters of 1986 to 1988 seems to have enhanced the DO decrease by reducing the duration of turnover. Metalimnetic DO minimum layer appearing every late summer at the depth 15∼20 m is a remarkable feature of DO distribution which is thought to be the typical pattern in large Korean reservoirs. The mechanism of the formation of metalimnetic oxygen minimum is further to be studied. However, it seems to be caused by the higher rate of oxygen consumption in epilimnion due to high temperature and the oxygen supply limited to only surface mixed layer, since it is formed just below the mixed layer and dissolved oxygen increase gradually in deeper layer. The intermediate current of storm runoff laden with organic debris of terrestrial origin might be the alternative cause.
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김범철,조규송,허우명,김동섭 ( Bom Chul Kim,Kyu Song Cho,Woo Myung Heo,Dong Sup Kim ) 한국하천호수학회 1989 생태와 환경 Vol.22 No.3
The trend of trophic status change in Lake Soyang from 1981 to 1989 was studied by the measrement of chlorophyll a concentration, transparency, total phosphorus concentration, and the rate of hypolimnetic oxygen deficit rate. And the phosphorus loading from the watershed was measured monthly at the main inflowing river, Soyang River. The increasing trend of chlorophyll was clear at the rate of 0.4 ㎍/ℓ/yr. The advent and expansion of Anabaena bloom was the major cause of chlorophyll increase and transparency reduction. The rate of hypolimnetic oxygen deficit also increased from 0.032㎎O₂/㎠/day in 1986 to 0.066 in 1988. The trophic state of Lake Soyang can be assessed as oligotrophy before 1983, mesotrophy from 1984 to 1988, and eutrophy since 1989. Phosphorus loading from floating net fishfarms was estimated to be larger than 45% of total. The phosphorus loading from only watershed is smaller than the dangerous critical loading, but, if the fishfarms loading added, it exceeds the critical loading.
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김범철,김은경,표동진,박호동,허우명 ( Bom Chul Kim,En Kyong Kim,Dong Jin Pyo,Ho Dong Park,Woo Myung Heo ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.3
Cyanobacterial blooms in eutrophic lakes often produce algal toxins causing death of cattle, wild animals, and fish. Many lakes and reservoirs in Korea are eutrophic and suspected for toxic cyanobacterial blooms. Phytoplankton were collected in late summer at the surface of 5 middle-stream reservoirs(Soyang, Choongju, Daechong, Jangsong, Hapchon), one estuarine reservoir(Yongsan), and a coastal lagoon(Yonglang). Phytoplankton communities were examined and the occurrence of toxic bloom was examined with mouse bioassay. In all the study lakes cyanobacteria were dominant phytoplankton. Especially, the appearance of Microcystis aeruginosa in all the study lakes that is a well-known toxin-producer species implies the possibility of toxic water bloom. Dried cells were extracted in saline solution and injected to mouse intraperitoneally for the test of toxicity. Mouse bioassay showed lethal effect for L. Yonglang, L. Hapchon, L. Jangsong, and L. Yongsan. The content of two cyanobacterial hepatotoxins(microcystin-RR and microcystin-LR) that have been reported to be most common were analyzed with HPLC. Microcystin-RR was detected in L. Daechong, L. Choongju, and L. Soyang. And microcystin-LR which has higher toxcicity was detected in L. Hapchon, L. Jangsong, L. Yonglang, and L. Yongsan. The coincidence of the microcystin-LR occurrence and the lethal effect in bioassay imply that microcystin-LR exerted more critical toxicity. From this study it was found that toxic cyanobacterial bloom is common in Korean lakes that are used for water supply.
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김범철,안태석,조규송 ( Bomchul kim,Tae Seok Ahn,Kyu Song Cho ) 한국하천호수학회 1988 생태와 환경 Vol.21 No.3
Trophic states were surveyed in reservoirs of the Han River. Trophic states were assessed from chlorophyll a concentration, Secchi disc transparency, total phosphorus and primary productivity in recent several years. Trophic state indices (TSI) were calculated from the summer-time average of water quality data TSIs were in the range of mesotrophy to eutrophy, from 40 to 55. The highest TSI of all the reservoirs of the Han River was observed at the inlet of the South Han River in Lake Paldang. TSI varied with year becuase of such event as turbid flood inflow, water bloom, and descending water level. The reservoirs of the North Han River showed higher TSI in 1987 than 1981 and 1982 because of high turbidity in Lake Paro caused by drawdown of water level. The correlation coefficients between the six TSIs were high, but the probabilities of paired T-test were very low, which means significant differences in the absolute dimensions of the TSIs. The correlation between TSI(SD) and TSI(TP) was highest and TSI(Chl) showed lower correlation with TSI(SD) and TSI(TP).
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김범철,허우명,전만식,김징호 ( Bom Chul Kim,Woo Myung Heo,Man Sik Jun,Jing Ho Kim ) 한국물환경학회 1993 한국물환경학회지 Vol.9 No.2
The amount of phosphorus discharge per ㎏ feed from the aquaculture of Israeli carp (Cyprinus carpio) was determined by monitoring the phosphorus discharge in the effluent of culture tanks. 10 commercial fishfeeds were used in order to delineate the relationship between discharge rate of phosphorus from fish culture and the phosphorus content of feeds ranging from 1.0% to 2.1%. 52% of phosphorus in the ingested feed was released into water through excretion. 68% of excreted phosphorus was in particulate form and 32% was in dissolved form. Phosphorus discharge was higher for feeds of higher P-content and also increased with the feed conversion ratio. Higher phosphorus discharge for feeds of higher P-content was mostly contributed by the increase of particulate phosphorus excretion showing positive correlation, whereas dissolved P excretions were at the similar level regardless of P- content. The total phosphorus discharge rate was 8.4(gP/㎏ feed) when the P-content of feed was 1.5%. The discharge rate will be smaller, if the P-content of feeds and the feed conversion ratio are lowered.
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김범철,허우명,황길순,김동섭,최광순 ( Bom Chul Kim,Woo Myung Heo,GIl Son Hwang,Dong Sup Kim,Kwang Soon Choi ) 한국하천호수학회 1995 생태와 환경 Vol.28 No.2
The distribution of phosphorus in Lake Soyang from January 1985 to August 1992 was surveyed by the measurement of soluble reactive phosphorus(SRP), total dissolved phosphorus(DTP), and total phosphorus(TP) concentration. SRP concentration was in the range of 2∼7mgP/m^3 in epilimnion, and 4∼200mgP/m^3 in hypolimnion. The vertical distribution pattern of SRP showed a large difference with the season. SRP concentration decreased during the growing season of phytoplankton in the epilimnion of Lake Soyang and increased in hypolimnion during the oxygen depletion. Higher concentration near the bottom implies they are diffused from the bottom sediment where organic particles are settled and degraded. SRP, DOP, POP and TP concentration was higher in the metalimnion of Lake Soyang in rainy season. It might be related with storm runoff. General trend of TP variation is that the TP concentration of water column is increasing substantially from year to year. TP concentration in the surface water increased from 5mgP/m^3 at 1985 to 20mgP/m^3 at 1992.
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호수가두리양어장 퇴적물 및 어류배설물의 인 조성과 용출에 관한 연구
김범철,박주현,전상호 ( Bom chul Kim,Ju Hyun Park,Sang Ho Jun ) 한국하천호수학회 1994 생태와 환경 Vol.27 No.3
Fishfarming in lakes have been widespread during last decade in Korea. Feed supply and subsequent phosphorus discharge through excretion can contribute significant proportion of phosphorus loading. As well as direct discharge of dissolved phosphorus into epilimnion, the regeneration of dissolved phosphorus from fecal deposit and lost feed can be a source of phosphorus. The regeneration of sedimented particulate phosphorus is known to be affected by the fractional composition of phosphorus; adsorbed-P, nonapatite-inorganic-P, apatite-P, and residual-P. The fractional composition of phosphorus was examined for the lake sediments, fishfarm sediments deposited under the carp culture cages, and the fecal deposits of carp. TP content was 1.3, 8.2, and 15.2mg/g for lake sediment, fishfarm sediment, and feces, respectively. The proportion of labile phosphorus(adsorbed-P+ NAI-P) was lower in lake sediment(35%) than in fishfarm sediment(53%) and feces(46%). Phosphorus regeneration from sedimented particulate matters were measured by batch incubations. After one week`s incubation in anaerobic condition, the dissolved phosphorus concentration in the overlying water reached the plateaus of equilibrium; 130mgP/m^3 for lake sediment, 250mgP/m^3 for fishfarm sediment. However, the regeneration from fecal deposits continued to increase over 800mgP/m^3 until the end of 20 days` incubation. Total amount of regenerated phosphorus was 28%, 34%, and 54% of total phosphorus for lake sediment, fishfarm sediment, and feces, respectively. Phosphorus release in aerobic condition was much lower than in anaerobic condition. It can be concluded that more than half of particulate phosphorus discharge from fish culture can be regenerated easily and contribute eutrophication in lakes.
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