Data List - Lake Biwa
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Major Data Source Documents
Category Item Name Item Title Item Remarks ILEC Publications Databook of World Lake Environments (Asia and Oceania) Lake Biwa asi-01.htmltest GEF/WB/ILEC LBMI Project Lake Biwa 05_Lake_Biwa.pdf -
Figures and Drawings
Category Item Name Item Title Item More Info. D. Physiographic Features D1 Geographical Bathymetric map asi01-01.gif D2 Climatic Average depth of maximum snow accumulation asi01-03.gif Distribution of mean annual precipitation asi01-02.gif D3 Hydrodynamic Gyre system (1983) JJL-SE 
See Figs. 6 and 7 in particular.
Internal Seiche (1974) JJL-SK
See Figs. 6, 11 and 12 in particular.
Large amplitude nonlinear internal surge JJL-CJ
See Figs. 4 and 5 in particular.
Wind fields and their effect on water circulation JJL-SE
See Figs. 2, 3, 4,5,6 and 9 in particulr.
D4 Hydrological Change in groundwater seepage rate into lake (1994) JJL-MT
See Fig. 4 and 8 in particular. A concluding statement is "...the significant role precipitation plays in the groundwater seepage rate..."
D5 Sedimentological Sedimentary environments Inferred from a lithofacies of the 1400 m core sample JJL-KT
See Figs. 1, 2 and 3 in particular.
E. Water Quality E1 Transparency Transparency yearly mean, Northern Lake (1921-1980) asi01-04.gif Transparency yearly mean, Southern Lake, Northern Lake, Seta River (1979-2015) asi-01-4.png E2 pH pH yearly mean, Southern Lake, Northern Lake, Seta River (1979-2015) asi-01-5.png E3 SS, Solids SS yearly mean, Southern Lake, Northern Lake, Seta River (1979-2015) asi-01-7.png E4 DO Bottom sediment oxygen demand in the northern basin JJL-NG
See Figs. 3, 4 and 5, in particular.
DO (1921-1980) asi01-05.gif E5-1 BOD BOD yearly mean, Southern Lake, Northern Lake, Seta River (1979-2015) asi-01-6.png BOD, distribution and time trend (1967-1982) asi01-07.gif E5-2 COD COD yearly mean, Southern Lake, Northern Lake, Seta River (1979-2015) asi-01-1.png Organic matter, Southern Lake, KMnO4 asi01-06.gif E6 Chlorophyll-a Horizontal distribution and seasonal change of chlorophyll a in the South Basin (Aug.1978 -Mar.1979) JJL-MN
See Fig.2 in particular. One of the concluding remarks, "....Chlorophyll-a conc. tended to change with three peaks in which dominant alga species differed among stations."
E7 Nitrogen T-N concentration, seasonal and annual trends, Southern Lake, Northern Lake, Seta River (1970-1982) asi01-08.gif T-N yearly mean, Southern Lake, Northern Lake, Seta River (1979-2015) asi-01-2.png E8 Phosphorus T-P concentration, seasonal and annual trends, Southern Lake, Northern Lake, Seta River (1972-1982) asi01-09.gif T-P yearly mean, Southern Lake, Northern Lake, Seta River (1979-2015) asi-01-3.png E9 Chloride, EC and Conductivity Long-term trends of chloride concentration ; (1) change in concentration (1920-2005) JJL-KH
See Figs. 6, 7, 8 and 9 in particular.
Long-term trends of chloride concentration; (2) chloride loadings from catchment JJL-KH
Estimation from land-based and airborne sources.
F. Biological Features F3 Primary Production Bacterioplankton production and dominant algal species in the north basin (Feb.-June 1990) JJL-SN
See Figs. 3 and 4 in particular.
Dominant phytoplankton, chlorophyll a and nutrient levels (Feb.-Dec. 1981) JJL-YT
See Figs. 3-11.
Epiphytic and planktonic algae and biogeochemical characteristics in reed zones (1999) JJL-OM
See Fig.4 in particular.
Photosynthesis and spectral absorption, of phytoplankton during stratification in Northern Basin (1994-1995) JJL-YT
See Figures 6-14. Conclusion: "...phytoplankton could efficiently utilize the absorbed light energy for phtosynthsis under weak radiation in deep water."
Seasonal change, gross, southern lake (~1982) asi01-10.gif Sestonic C : N : P ratios, nutritional state of phytoplankton, South Basin (May 1987 -May 1988) JJL-MN
See Figs. 2 and 3. A concluding remarks "...phytoplankton were exposed frequently to moderate or severe phosphorus deficiency from May to October 1987 but little therafter until May 1988, whereas they were not in the state of severe nitrogen deficiency except for a given time in November of 1987."
F4 Biomass Submerged macrophyte, southern basin, echo-sounder (1994-2001) JJl-TO
See Fig.4 and 5, in particular.
Submerged macrophytes, southern basin (2007, 2002) JJL-HH
See Abstract, Table 1 and Fig 2 in particular.
Submerged macrophytes, southern basin (2017) JJL-HH
See Abstract, Tables 1 and 2, Fig. 3 in particular
F6 Past Trends Fluctuation of Elodea nuttallii, an alien species (1988-1989) JJL-EH
See Fig. 7 in particular.
Phytoplankton biomass asi01-11.gif Population densities of main phytoplankton taxa asi01-12.gif Sudden expansion of submerged macrophytes (2008) JJL-HH
See Fig.2, 3 and 4 in particular.
G. Socio-economic Conditions G2 Industries Industrial production trend asi01-13.gif G3 Population Population increase trend asi01-14.gif H. Lake Utilization H2 Water Resource Lake Biwa – Yodo River water use (as in 1980) asi01-15.gif I. Deterioration and Hazards I2 Toxic Contamination BHC concentration asi01-16.gif Past trend of BHC accumulation in the body of Chaenogobius isaza asi01-17.gif Past trend of CNP accumulation in the body of Chaenogobius isaza asi01-18.gif I3 Eutrophication Eutrophication trend of the North Basin (1966-1989) JJL-YT
Figs. 1, 2 and 3 and Table 1 led to a conclusion, "...phosphorus sedimentation plays a decisive role in the delay of the eutrophication of Lake Biwa."
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Tables and Lists
Category Item Name Item Title Item More Info. D. Physiographic Features D2 Climatic Monthly mean atmospheric temperature and precipitation (1951-1980); Monthly mean water temperature by depth (1982-1986) asi-01-d2.txt D4 Hydrological Chemical study of precipitation on lake JJL-YM
See Table 1. in particular.
E. Water Quality E1 Transparency Monthly mean (1982-1986) for Station 1 (Northern Lake) and Station 2 (Southern Lake) asi-01-e1.txt E2 pH Monthly mean by depth (1982-1986) for Station 1 and Station 2 asi-01-e2.txt E3 SS, Solids Monthly mean by depth (1982-1986) for Station 1 and Station 2 asi-01-e3.txt E4 DO Monthly mean by depth (1982-1986) for Station 1 and Station 2 asi-01-e4.txt E5 COD Monthly mean by depth (1982-1986) for Station 1 and Station 2 asi-01-e5.txt E6 Chlorophyll-a Monthly mean by depth (1982-1986) for Station 1 and Station 2 asi-01-e6.txt E7 Nitrogen NH4-N, NO3-N, T-N: Monthly mean by depth (1982-1986) for Station 1 and Station 2 asi-01-e7.txt E8 Phosphorus PO4-P, T-P: Monthly mean by depth (1982-1986) for Station 1 and Station 2 asi-01-e8.txt F. Biological Features F2 Fauna Ecological notes of the fishes and their Interspecific relations (1966) JJL-TM
See Tables 1 and 2.
F4 Biomass Submerged macrophytes asi-01-f4.txt F6 Past Trends Fishery production asi-01-f6.xls G. Socio-economic Conditions G1 Land Use Land Use in the Catchment Area asi-01-g1.xls G2 Industries Production statistics asi-01-g2.txt H. Lake Utilization H2 Lake as Water Resource Use types and amounts asi-01-h2.xls I. Deterioration and Hazards I2 Toxic Contamination Main contaminants concentrations and asi-01-i2.txt I3 Eutrophication T-N and T-P by sources asi-01-i3.txt J. Wastewater Treatment J2 Nutrient Loads By sources asi-01-j2.txt -
Photos and Images
Category Item Name Item Title Item More Info. Photos Areal photo Northward view of the whole lake from southern end asi01.jpg
