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Effects of Internal Waves on Dynamics of Hypoxic Waters in Lake Biwa  

Kitazawa, Daisuke (Institute of Industrial Science, The University of Tokyo)
Kumagai, Michio (Lake Biwa Environmental Research Institute)
Hasegawa, Naoko (Ochanomizu University)
Publication Information
Journal of the Korean Society for Marine Environment & Energy / v.13, no.1, 2010 , pp. 30-42 More about this Journal
Abstract
The effects of internal waves on dynamics of hypoxic waters were investigated by numerical simulation by means of a hydrostatic-ecosystem coupled numerical model for Lake Biwa. The numerical model consists of hydrostatic and ecosystem submodels. Numerical simulation was carried out for a period during April 2007 and March 2008, after preliminary numerical simulation for three years. As a result, the numerical model could capture the vertical profiles of the observed water quality. During September 30 and October 21 in 2007, the major internal waves were Kelvin and Poincare waves, the periods of which were 1.63 or 1.77 days and 0.48 days, respectively. Hypoxic waters appeared in bottom boundary layer around October and were still when thermocline locates in upper layer. During late autumn and winter seasons, differences in density between upper and lower layers were reduced and the amplitude of internal waves increased. Hypoxic waters began to move under the effects of internal waves. Movement of hypoxic waters will diminish the habitat for aquatic organisms in deeper waters.
Keywords
Ecosystem model; Hypoxic waters; Internal waves; Numerical simulation; Vertical mixing;
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1 Shimizu, K and Imberger, J., 2008, "Energetics and damping of basin-scale internal waves in a strongly stratified lake", Limnol. Oceanogr., 53(4), 1574-1588.   DOI   ScienceOn
2 Akitomo, K., Tanaka, K., Kumagai, M. and Jiao, C., 2009, "Annual cycle of circulations in Lake Biwa, part 1: model validation", 10(2), 105-118.   DOI   ScienceOn
3 Kumagai, M., Asada, Y. and Nakano, S., 1998, "Gyres measured by ADCP in Lake Biwa", Physical Processes in Lakes and Oceans, Coastal and Estuarine Studies, American Geophysical Union, Washington D. C., 199-208.
4 Kitazawa, D. and Kumagai, M., 2005, "Numerical simulation on seasonal variation in dissolved oxygen tension in Lake Biwa", Proceedings of the 2nd Joint Japan/Korea Workshop on Marine Environmental Engineering, 71-90.
5 Ishizuka, H., Kitazawa, D. and Konno, A., 2005, "A feasibility study of turbulence models for numerical simulation of physical environment in Lake Biwa", Proceedings of the 19th Computational Fluid Dynamics Symposium, C2-4 (in Japanese).
6 Fujinaga, T., 2005, "Chemistry in oceans and lakes", Kyoto University Press, 560pp. (in Japanese)
7 Unoki S., 1993, "Coastal physical oceanography", Tokai University Press, 672pp. (in Japanese).
8 Oonishi, Y., 1975, "Development of the current induced by the topographic heat accumulation (I), -The case of the axisymmetric basin-", Journal of the Oceanographical Society of Japan, 31, 243-254.   DOI
9 Kondo, J., 1975, "Air-sea bulk transfer coefficients in diabatic conditions", Boundary-Layer Meteorology, 9, 91-112.   DOI
10 Somiya, I., 2000, "Lake Biwa -its environment and water quality-", Gihodosyuppan, 274pp. (in Japanese)
11 Schwab, D.J., O'Connor, W.P. and Mellor, G.L., 1995, "On the net cyclonic circulation in large stratified lakes", Journal of Physical Oceanography, 25, 1516-1520.   DOI   ScienceOn
12 Fotonoff, N.P. and Millard Jr., R.C., 1983, "Algorithms for computation of fundamental properties of seawater", Unesco technical papers in marine science, 53pp.
13 Ikeda, S. and Adachi, N., 1978, "A dynamic water quality model of lake biwa, - A simulation study of the lake eutrophication -", Ecological Modelling, 4, 151-172.   DOI   ScienceOn
14 Akitomo, K., Kurogi, M. and Kumagai, M., 2004, "Numerical study of a thermally induced gyre system in Lake Biwa", Limnology, 5, 103-114.
15 Munk, W.H. and Anderson, E.R., 1948, "Notes on a theory of the thermocline", Journal of Marine Research, 7, 276-295.
16 Webb, E.K., 1970, "Profile relationships: the log-linear range, and extension to strong stability", Quarterly Journal of the Royal Meteorological Society, 96, 67-90.   DOI
17 Hirose, N., Kim, C. H., and Yoon, J. H., 1996, "Heat budget in the Japan Sea", Journal of Oceanography, 52, 553-574.   DOI   ScienceOn
18 Hosoda, T. and Hosomi, T., 2002, "A simplified model to predict seasonal variations of vertical water quality distributions in Lake Biwa and its applications", Advances in River Engineering, JSCE, 8, 495-500 (in Japanese).
19 Kondo, J., 1994, "Meteorology for water environment", Asakurashoten, 348pp. (in Japanese)
20 Kumagai, M., Vincent, W.F., Ishikawa, K. and Aota, Y., 2003, "Chapter 1, Lessons from Lake Biwa and other Asian lakes: global and local perspectives, Freshwater management, Global versus local perspectives", Springer-Verlag, Tokyo, 1-22.
21 Lake Biwa Research Institute, 2005, "Final report of the committee on oxygen depletion problem in Northern Basin of Lake Biwa", Lake Biwa Research Institute, 262. (in Japanese).
22 Scholten, M.C.Th., Foekema, E.M., Van Dokkum, H.P., Kaag, N.H.B.M. and Jak, R.G., 2005, "Eutrophication management and ecotoxicology", Springer-Verlag, Berlin Heidelberg.
23 Matzinger, A., Spirkovski, Z., Patceva, S. and Wuest, A., 2006, "Sensitivity of ancient Lake Ohrid to local anthropogenic impacts and global warming", Journal of the Great Lakes Research, 32, 158-179.   DOI   ScienceOn
24 Intergovernmental Panel on Climate Change, 2007, "Climate change 2007, The physical science basis", Cambridge University Press, 996.
25 Diaz, R.J. and Rosenberg, R., 2008, "Spreading dead zones and consequences for marine ecosystems", Science, 321, 926-929.   DOI   ScienceOn
26 Saggio, A. and Imberger, J., 1998, "Internal wave weather in a stratified lake", Limnol. Oceanogr., 43(8), 1780-1795.   DOI
27 Shimizu, K., Imberger, J., and Kumagai, M., 2007, "Horizontal structure and excitation of primary motions in a strongly stratified lake", Limnol. Oceanogr., 52(6), 2641-2655.   DOI   ScienceOn