• Title/Summary/Keyword: LAKE CHARACTERISTICS

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Structure and Succession of Zooplankton Community in Several Artificial Lakes in the Han River System (한강 수계 주요 댐호에서의 동물플랑크톤 군집 구조와 천이)

  • You, Kyung-A;Park, Hae-Kyung;Kong, Dong-Soo;Hwang, Soon-Jin
    • Journal of Korean Society on Water Environment
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    • v.26 no.5
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    • pp.850-859
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    • 2010
  • Structure and succession of zooplankton community studied by hydraulic and ecological characteristics targeting the five lakes in the Han river system from March to December 2008. Results separated by river-type lake and lake-type lake depending on the type of hydraulic, Paldang lake and Cheongpyeong lake were river-type lake, while Chungju lake, Hoengseong lake and Doam lake was lake-type lake. The Paldang lake was a eutrophic lake, zooplankton community density and species number were the most among the five lakes. Relative dominance of the rotifera was the largest and the yearly first dominant species was a small cladocera Bosmina longirostris. The Cheongpyeong lake was a mesotrophic-eutrophic lake, hydraulic characteristics and zooplankton community changes were similar the Paldang lake. Relative dominance of the cladocera was the largest and the yearly first dominant species was a small cladocera Bosmina longirostris. The Chungju lake was a oligotrophic-mesotrophic lake, zooplankton community density was the least among the five lakes. Relative dominance of the copepoda was the largest and the yearly first dominant species was a large cladocera Daphnia galeata. The Hoengseong lake was a oligotrophic-mesotrophic lake, relative dominance of the rotifera was the largest and the yearly first dominant species was a small cladocera Bosmina longirostris. The Doam lake was a mesotrophic-eutrophic lake, zooplankton community density showed dramatic difference at the investigation time. Relative dominance of the rotifera was the largest and the yearly first dominant species was the copepoda Nauplius.

Characteristics of Water Quality Behavior in Boryeong Freshwater Lake (보령담수호의 수질거동 특성)

  • Kim, Sun-Joo;Lee, Suk-Ho;Lee, Chang-Hyeong
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2001.10a
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    • pp.412-416
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    • 2001
  • Among water quality models, WASP5 was applied to Boryeong freshwater lake, as a part of Water Quality Management System. The WASP modeling system is a generalized modeling framework for contaminant fate and transport in surface waters. The simulated result was compaired with actual measurement. So, before and after making freshwater lake were compaired. After this research, the lake may have eutrophication and water quality would be worse after making the lake as freshwater lake. Therefore, to make the freshwater lake better, more appropriate plan is necessary.

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Interannual Variations of Limnological and Ecological Characteristics in Acidic Lake Katanuma

  • Kikuchi, Eisuke;Takagi, Shigeto;Doi, Hideyuki;Shuichi, Shikano
    • Korean Journal of Ecology and Environment
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    • v.38 no.4 s.114
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    • pp.435-438
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    • 2005
  • We observed the physical, chemical, and biological characteristics of an acidic lake, Lake Katanuma, from 1998 to 2002 at weekly or biweekly intervals, except during the winter. This volcanic lake has a dimictic thermal pattern. In summer, the volcanic heat supply at the lake bottom results in weak thermal stratification. In 1998, 1999, and 2002, short-term holomixis was observed during the stratification period, when the anoxic, hydrogen sulfide-rich water from the hypolimnion spread across the entire lake. In contrast, distinct short-term holomixis did not occur during the stratificatlon period in 2000 and 2001. However, the early onset of the autumn turnover in August 2000 and 2001 caused anoxic conditions to persist throughout the entire water column for more than 2 weeks. The anoxic and hydrogen sulfide-rich conditions affected population densities of chironomid larvae (Chironomus acerbiphilus) and planktonic algae (Chlamydomonas acidophila), both dominant species in Lake Katanuma. Thus, the interannual variations of limnological characteristics influenced the seasonal population changes of these species.

The Status and Prospect of Lake Eutrophication Control Technologies in Korea (호소 부영양화 방지기술의 현황과 전망)

  • 류재근
    • Journal of environmental and Sanitary engineering
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    • v.7 no.1
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    • pp.35-44
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    • 1992
  • This paper included the preventive measures and the prospect of lake eutrophication in korea. All pollution control techniques must be applied after the characteristics of the lakes are surveyed sufficlenty, Most of Korean lakes are the large man-made ones and their characteristics are different from those of natural ones in foreign nation. Some of many techniques for natural lakes can be applied in our lakes also, others must be revised. Lake water quality can be ameliorated only by systematic researches and technologies because lake ecosystem is very complicated. It is impossible to improve water quality with fragmentary and shortterm projects.

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Characteristics of Allochthonous Organic Matter in Large Dam Reservoir, Lake Soyang (소양호에서 외부기원유기물의 유입, 유출 특성)

  • Park, Hae-Kyung;Kwon, Oh-youn;Jung, Dong-Il
    • Journal of Korean Society on Water Environment
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    • v.27 no.1
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    • pp.88-97
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    • 2011
  • To identify the inflow and outflow characteristics of allchthonous organic matters and examine the change of allochthonous organic matter load pattern due to the climate change, we investigated the temporal variations of DOC and POC concentrations within inflow water and dam discharge water and spatio-temporal distribution of POM within the lake water in Lake Soyang which is the largest dam reservoir in Korea in 2006. Most of allochthonous DOC flowed into the lake water during initial rain and was not affected by the amount of precipitation, whereas most of allochthonous POC flowed into during concentrated heavy rain and the concentration of POC was significantly associated with the amount of inflow water and precipitation. Calculated annual allochthonous organic matter loads in Lake Soyang from 2003 to 2006 using the regression equation between the amount of inflow water and the concentration of POC indicate allochthonous organic matter loads are mainly affected by total influx and extreme influx of inflow water. The spatio-temporal distribution of POM indicated allochthonous organic matter of inflow river during flood period in July transported from upper part to middle and lower part of the lake a month later respectively along the middle layer of water column in Lake Soyang.

Characteristics of Release Rate of Nutrients from Sediment in Lake Paldang and Lake Cheongpyeong (팔당호와 청평호 퇴적물에서 영양염류 용출 특성)

  • Lee, Kyoo;Choi, Myung-Jae;Park, Hae-Kyung;Lee, Jang-ho
    • Journal of Korean Society on Water Environment
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    • v.25 no.5
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    • pp.742-749
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    • 2009
  • To examine the characteristics of the nutrient release from the sediments in two reservoirs, Lake Paldang and Lake Cheungpyeung, we analyzed physical and chemical properties of the sediments and calculated the nutrient release rates from the sediments. The particle properties of sediments in Lake Paldang changed from silt to sand after summer rainy season, especially in the water area of the Kyeungan River where the water depth was shallow and the width of river was narrow. The sediments in Lake Cheungpyeung had higher contents of silt and clay than in Lake Paldang, and the particle size was not much different before and after rainfall. The release rates of nutrients in two lakes varied with the kind of nutrients and the season. The release rates of DTN and ${NH_4}^+-N$ in Lake Paldang were faster in spring than autumn. But the Lake Cheungpyeung showed similar values of release rates before and after summer rainy season. ${NO_3}^--N$ and phosphorous were not released from sediments or were absorbed into sediments all the time in two lakes. Compared with other lakes, the sediments of two lakes consisted of bigger particles and had a lower organic matters content than other lake-type reservoirs. Due to the short hydraulic retention time and no stratification throughout the year in Lake Paldang and Lake Cheungpyeung, the release rates of nutrients from sediment in these reservoirs were lower than other lakes and this seems to be a typical characteristic of river-type reservoirs.

On the Realities of Hydrach Succession in Brackish Water Lakes and Ecological Restoration Policy (기수호의 습성천이 현상과 생태적 복원정책)

  • Sin, Seung Chun;Park, Yong Gil
    • Journal of Environmental Science International
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    • v.13 no.1
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    • pp.11-17
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    • 2004
  • The purpose of this study is to present the model of ecological restoration through analysis on the condition of hydrach succession process in brackish water lake. To this study, we investigate and research the present condition of brackish water lake in South Korea. Most brackish water lake in South Korea have characteristics that is come into being malignant hydrach succession. Many lakes were reclaimed to increase foodstuff production. And river conservation work seperate lakes from the ocean. In a embryological view, most lakes based on the brackish water lakes, But present lakes show many different types such as a fresh water lake, a salt lake, a brackish water lake, a swamp, and a marshland. As a result, brackish water lakes have greatly damaged by diverse artificial interventions to promote people's activities. Therefore, in order to manage brackish water lakes systematically, criteria of lake preservation must be coincide with the present conditions of hydrach succession in each lake.

Dynamics of Phytoplankton Communities of Major Dam Reservoirs in Han River System (한강 수계 주요 인공댐호의 식물플랑크톤 군집 동태)

  • Youn, Seok Jea;Park, Hae-Kyung;Shin, Kyoungae
    • Journal of Korean Society on Water Environment
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    • v.26 no.2
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    • pp.317-325
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    • 2010
  • This study was to investigate phytoplankton communities and to evaluate the effects of hydrological and physical-chemical environmental factors in major five dam reservoirs in the Han River water system. Annual average of chlorophyll a concentration in Lake Paldang, Lake Cheongpyeong and Lake Doam was higher than that of Lake Chungju and Lake Hoengseong. The opposite seasonal variation patterns of phytoplankton growth were observed in dam reservoirs; the highest biomass in spring of dry season in Lake Paldang, Lake Cheongpyeong which are the river-type reservoirs and Lake Doam where turbidity was high throughout the year, and in summer and autumn of rainy season in Lake Chungju and Lake Hoengseong which are the lake-type reservoirs, indicating that the seasonal pattern for growth of phytoplankton in on-river reservoirs is mainly determined by hydrologic characteristics. The dominant species of phytoplankton in Lake Paldang, Lake Cheongpyeong and Lake Doam, where the concentration of nutrients was relatively high, were Bacillariophyceae such as Stephanodiscus hantzschii, Aulacoseira granulata var. angustissima in Lake Paldang and Lake Cyeongpyeong and Nitzschia spp. in Lake Doam throughout all season. The dominant species of phytoplankton in Lake Chungju and Lake Hoengseong which showed the oligo-mesotrophic state, were Bacillariophyceae such as Stephanodiscus hantzschii, Cyclotella pseudostelligera in spring and winter, but Cyanophyceae such as Microcystis spp. in summer.

Characteristics and Distribution of Turbidity and Suspended Matter by the Operation of Sluice Gates in Sihwa Lake (시화호 배수갑문 개폐에 따른 탁도와 부유물질의 분포와 특성)

  • Choi Jung-Hoon;Hong Dae-Byuk;Lim Jong-Wan
    • KCID journal
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    • v.9 no.1
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    • pp.38-47
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    • 2002
  • The Lake Sihwa gradually changes from freshwater lake to saline lake due to inflow of seawater by sluice gates . The changes of lake water are closely related to characteristic and distribution of turbidity and suspended matter. During the period April-Ma

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