D28: Internal seiche mixing study - Hydromod

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Integrated Water Resource Management for Important Deep European Lakes and their Catchment Areas EUROLAKES D28: Internal seiche mixing study FP5_Contract No.: EVK1-CT1999-00004 Version: 1.2 Date: 24.08.2004 File: D28.doc Page 80 of 92 Figure 55 : Current field of the eleventh internal mode in the surface layer on 30 August 1989, T11 = 9.6 h. The cross mark near the southern shore in the eastern half of the lake designates the site of the waste water intake discussed in the text. The normalised maximum transport (at the mouth of the Bay of Constance) is about 3400 cm 2 /s. The normalised transport at the waste water intake is about 3200 cm 2 /s. (further explanation in Figure 50) The above mentioned application by Hollan (1995) elucidates this way of consideration. For information, the site of a great waste water inlet, which was considered for alternative construction, is marked by a cross in the lower diagrams of Figure 52 and Figure 55. These figures show the current fields of the eleventh mode in both cases. Compared to those of the first and ninth mode they differ in the region of this site remarkably, in particular for the late summer stratification, which is rather representative for the summer season. The investigation of dispersion conditions in front of this shore section, which is just aside of the mouth of the Old Rhine, resorted also to the potential activity of internal seiches in this region. From the comparison of the relative current contributions by different modes of internal seiches it was deduced, that considerable variability had to be expected from this process. These conditions can be recognised even from the examples shown here, as mentioned above. The result of the calculations with this application is supported by long-time experiences of local fishermen, who reported to the author (Hollan) about the difficulties with the retrieval of their drift nets in this region due to transient high vertical current shear in the thermocline. Such phenomenon is very probably caused by internal seiches, since otherwise vertical shear would be associated with drift and compensating gradient current during stronger wind attack over the lake. However, during such conditions fishermen interrupt their work on the lake, what underscores the first interpretation.
Integrated Water Resource Management for Important Deep European Lakes and their Catchment Areas EUROLAKES D28: Internal seiche mixing study 4.7 REFERENCES FP5_Contract No.: EVK1-CT1999-00004 Version: 1.2 Date: 24.08.2004 File: D28.doc Page 81 of 92 Bäuerle E. (1981) : Die Eigenschwingungen abgeschlossener, zweigeschichteter Wasserbecken bei variabler Bodentopographie. Berichte aus dem Institut für Meereskunde an der Univ. Kiel, Nr. 85, Kiel, 79pp. Bäuerle E. and E. Hollan (1983): Calculation of the fundamental and a transverse mode of internal seiches in Lake Tanganyika. In: Serruya C. and U. Pollingher: Lakes of the Warm Belt. Appendix, p.499-503, Cambridge, pp.569, Cambridge University Press. Bäuerle E. (1985): Internal free oscillations in the Lake of Geneva. Annales Geophysicae, Vol. 3, p.199-206. Bäuerle E. and D. Ollinger (1991): Karten-Dokumentation der internen Seiches des Bodensee-Obersees für den Gebrauch in der wasserwirtschaftlichen und limnologischen Anwendung. Unpublished report of the Institut zur Erforschung und zum Schutz der Gewässer Ottendorf, by contract with the Landesanstalt für Umweltschutz Baden- Württemberg, Institut für Seenforschung, Langenargen. 10p. with numerous tables and figures. Bäuerle E., D. Ollinger and J. Ilmberger (1998): Some meteorological, hydrological, and hydrodynamical aspects of Upper Lake Constance. In: Bäuerle, E. and Gaedke, U. (eds.): Lake Constance, Characterization of an ecosystem in transition. Arch. Hydrobiol. Spec. Issues Advanc. Limnol. 53, p. 31-83. Hollan E. (1974): Strömungsmessungen im Bodensee. Arbeitsgemeinschaft Wasserwerke Bodensee-Rhein (AWBR), Sechster Bericht, p.111-187. Hollan E. and T.J. Simons (1978): Wind-induced Changes of Temperature and Currents in Lake Constance. Arch. f. Meteorologie, Geophysik u. Bioklimatologie, Ser. A, Vol 27, p333-373. Hollan E., D.B. Rao and E. Bäuerle (1980): Free Surface Oscillations in Lake Constance with an Interpretation of the “Wonder of the Rising Water “ at Konstanz in 1549. Arch. f. Meteorologie, Geophysik u. Bioklimatologie, Ser. A, Vol. 29, No. 3, p.301-325. Hollan E. (1995): Ausbreitungsverhalten des Abwassers aus der Kläranlage Altenrhein im Fernbereich zweier alternativ projektierter Auslauföffnungen an der Halde südwestlich des Rheinspitz-Canyons im Bodensee-Obersee. Internal report of the Institut für Seenforschung (Landesanstalt für Umweltschutz Baden-Württemberg), by contract with the Amt für Umweltschutz of the Kanton St. Gallen, Langenargen, pp.17, 1map, 12 figures.
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D28: Internal seiche mixing study - Hydromod

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