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引用本文:远藤修一,Kunihiko SAGI,Naonori FUKUYAMA,Munetsugu KAWASHIMA,奥村康召.琵琶湖中浊度的季节变化.湖泊科学,1998,10(s1):267-273. DOI:10.18307/1998.sup29
Shuichi ENDOH,Kunihiko SAGI,Naonori FUKUYAMA,Munetsugu KAWASHIMA,Yasuaki OKUMURA.Seasonal Variation of Turbidity in Lake Biwa. J. Lake Sci.1998,10(s1):267-273. DOI:10.18307/1998.sup29
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琵琶湖中浊度的季节变化
远藤修一1, Kunihiko SAGI1, Naonori FUKUYAMA1, Munetsugu KAWASHIMA1, 奥村康召2
1.Faculty of Education, Shiga University, 2-5-1 Hiratsu, Otsu 520-0862, Japan;2.Faculty of Engineering, Osaka Electro-Communication University, 1130-70 Kiyotaki, Shijonawate, Osaka 575-0063, Japan
摘要:
Seasonal variation of the turbidity (suspended substance) has been investigated in Lake Biwa. During the last five years, vertical and horizontal distributions of water temperature, turbidity, electric conductivity and chlorophyll-a have been obtained both in the south basin and the southern part of the north basin of Lake Biwa. The benthic nepheloid layer (BNL) developed in the seasons of thermal stratification, and is not detectable in the non-stratification period (winter). The BNL is mainly maintained by the organic matter such as phytoplankton under decomposition. However, the turbidity in the nepheloid layer was much affected by the turbid water from rivers after heavy rainfall. In this case, the major component of the suspended substance (SS) in the nepheloid layer was inorganic soil. The particulate P concentration, which is originated from phytoplankton, also increased after a rain fall. This suggests that phytoplankton in the surface layer sinks with clay and silt coming through rivers. From summer to the end of the stratification period, another kind of turbidity appeared in the bottom layer. This is caused by the chemical reaction of manganese under the anoxic condition. The resuspension of bottom sediment by strong currents also occurred, but it is not a major process for maintaining the BNL.
关键词:  Lake Biwa  turbidity  river water  nepheloid layer
DOI:10.18307/1998.sup29
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Seasonal Variation of Turbidity in Lake Biwa
Shuichi ENDOH1, Kunihiko SAGI1, Naonori FUKUYAMA1, Munetsugu KAWASHIMA1, Yasuaki OKUMURA2
1.Faculty of Education, Shiga University, 2-5-1 Hiratsu, Otsu 520-0862, Japan;2.Faculty of Engineering, Osaka Electro-Communication University, 1130-70 Kiyotaki, Shijonawate, Osaka 575-0063, Japan
Abstract:
Seasonal variation of the turbidity (suspended substance) has been investigated in Lake Biwa. During the last five years, vertical and horizontal distributions of water temperature, turbidity, electric conductivity and chlorophyll-a have been obtained both in the south basin and the southern part of the north basin of Lake Biwa. The benthic nepheloid layer (BNL) developed in the seasons of thermal stratification, and is not detectable in the non-stratification period (winter). The BNL is mainly maintained by the organic matter such as phytoplankton under decomposition. However, the turbidity in the nepheloid layer was much affected by the turbid water from rivers after heavy rainfall. In this case, the major component of the suspended substance (SS) in the nepheloid layer was inorganic soil. The particulate P concentration, which is originated from phytoplankton, also increased after a rain fall. This suggests that phytoplankton in the surface layer sinks with clay and silt coming through rivers. From summer to the end of the stratification period, another kind of turbidity appeared in the bottom layer. This is caused by the chemical reaction of manganese under the anoxic condition. The resuspension of bottom sediment by strong currents also occurred, but it is not a major process for maintaining the BNL.
Key words:  Lake Biwa  turbidity  river water  nepheloid layer
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