Dear Kumar,
I was wondering if you can send me the pdf files of
your papers. Thanks, Shaoneng He
--- "Dr.U..Saravana Kumar" <[log in to unmask]>
wrote:
> Dear all,
> I would like to add to what has been discussed in
> the below
> message. We also have experienced in small and
> shallow lakes (both,
> natural and man-made) in south India the phenomenon
> of poor horizontal mixing
> in the lake waters and good mixing vertically.
>
> Only in case of fairly deep lakes the phenomenon of
> seasonal stratification
> was observed and that gets broken in winter (i.e.,
> winter overturn) in most of
> Indian lakes. WE have published a few papers in
> journals like HYDROLOGICAL
> PROCESSES, Applied Radiation and Isotopes, Current
> Science etc and reprints
> of a few of them was sent a few list memebers on
> request recently.
>
> [Also to mention that, the same phenomenon of
> seasonal stratification, which
> is temperature induced in most of Indian natural and
> man-made lakes, is being
> used now-a-days not only in water balance, dynamics
> and lake-gw interaction
> related studies but also is extended in
> understanding/diagonising
> reservoir/lake seepage/leakage related problems. Our
> centre has wide
> experience on this area of isotope hydrology.
>
> Best Regards,
> U. Saravana Kumar
> BARC, Mumbai
>
>
**********************************************************************
> U. Saravana Kumar B.E., M.Tech., Ph.D.,
> Scientific Officer 'F'
> Isotope Hydrology Section
> Isotope Applications Division
> Bhabha Atomic Research Centre
> Trombay- 400 085. Mumbai. INDIA
>
> Tel: 91-022-2559 2418 (Off.)
> 91-022-2558 7082 (Res.)
> Fax: 91-022-2550 5151
>
> Email:[log in to unmask] (Per.)
> [log in to unmask] (Per.)
>
************************************************************************
>
> On Thu, 5 May 2005, Forizs Istvan wrote:
>
> > Dear Professor Gonfiantini, dear Roberto,
> >
> > thank you very much for your valuable comment!
> >
> > My opinion is the same as your one regarding the
> vertical isotopic
> > stratification of very shallow lakes like the
> Balaton. Most probably
> > there is no stratification.
> > It is very interesting what you wrote about the
> horizontal zoning
> > (insufficient mixing). That is one of my ideas
> that the horizontal
> > mixing is not good enough in the case of Balaton,
> because the lake
> > (along the southern shoreline) is very shallow
> even at 1000 meters
> > offshore (70 cm). It is a pity that there is no
> data about the
> > horizontal inhomogeinity of d18O values of such
> shallow lakes in the
> > literature.
> > I will ask Rank about his experience on Lake
> Neusiedl.
> >
> > Best regards
> > Istvan Forizs
> >
> > Roberto Gonfiantini wrote:
> >
> > > Dear Dr Forizs,
> > >
> > > Isotopic stratification in lake waters is known
> to occur in summer, when
> > > the thermocline prevents vertical mixing and
> therefore surface water
> > > becomes slightly enriched in heavy isotopes.
> This has been observed in
> > > many
> > > cases, but not much is reported in the
> literature.
> > >
> > > However, in the case of a shallow lake as Lake
> Balaton, I believe that
> > > you
> > > cannot expect such a stratification: winds are
> usually sufficient to keep
> > > the water column well mixed. You may rather
> expect that horizontal mixing
> > > is insufficient. For example, a difference in
> isotopic composition was
> > > observed in a similar lake, the Neusiedlersee
> (which is also not too far
> > > from Lake Balaton), between a zone of reeds and
> the open lake: in reeds,
> > > during summer the water was more enriched in
> heavy isotopes of about
> > > 10-15
> > > per mil in deuterium, which corresponds to about
> 2-3 per mil in O-18.
> > > (Zimmermann & Ehhalt (1970): Stable isotopes in
> the study of water
> > > balance
> > > of Lake Neusiedl, Austria. In: Isotope Hydrology
> 1970, IAEA, Vienna,
> > > pp.129-138). This enrichment can be explained
> theoretically, but
> > > essentially is due to the fact that reeds hinder
> horizontal mixing.
> > >
> > > I do not know whether this helps to explain your
> data. If however you
> > > want
> > > to compare with the situation in Lake Neusiedl,
> I suggest you to get in
> > > touch with Dr. Dieter Rank in Vienna
> ([log in to unmask]).
> > > Dieter has
> > > continued to study the Neusiedlersee and he
> should be able to tell you
> > > more, and provide his publications on the lake
> (whose references I do not
> > > have at hand, in this moment).
> > >
> > > Roberto Gonfiantini
> > >
> > >
> > >
> > > At 08.21 27/04/2005 +0200, you wrote:
> > >
> > >> Dear Listmembers,
> > >>
> > >> could any of you tell me a publication about
> the vertical d18O profile
> > >> of lake water (if there is any)?
> > >> I think that during strong evaporation the
> uppermost warm water layer is
> > >> enriched in 18O, but I do not know any
> published data.
> > >>
> > >> Best regards
> > >> Istvan Forizs
> > >>
> > >>
> > >> --
> > >>
>
-------------------------------------------------------------------------
> > >>
> > >> Dr. FÓRIZS István ......... Istvan FORIZS Ph.D.
> > >> Magyar Tudományos Akadémia, Geokémiai
> Kutatóintézet
> > >> Institute for Geochemical Research, Hungarian
> Academy of Sciences
> > >> Cím/Address: H-1112 Budapest, Budaörsi út 45.
> Hungary
> > >> Tel./Phone: (36-1)-309-2600/ mellék/extension
> 1151
> > >> Fax: (36-1)-319-3137
> > >> Http://www.geokemia.hu/people/forizs_hu.html
> > >>
>
-------------------------------------------------------------------------
> > >>
> > >
> > >
> > > Prof. Roberto Gonfiantini
> > > Istituto di Geoscienze e Georisorse
> > > Institute of Geosciences and Georesources
> > > Area della Ricerca del CNR
> > > Via G. Moruzzi, 1
> > > I-56124 Pisa
> > > Italy
> > > Phone +39-050-315-2358
> > > e-mail [log in to unmask]
> > >
> > >
> >
> > --
> >
>
-------------------------------------------------------------------------
> > Dr. FÓRIZS István ......... Istvan FORIZS Ph.D.
> > Magyar Tudományos Akadémia, Geokémiai
> Kutatóintézet
> > Institute for Geochemical Research, Hungarian
> Academy of Sciences
> > Cím/Address: H-1112 Budapest, Budaörsi út 45.
> Hungary
> > Tel./Phone: (36-1)-309-2600/ mellék/extension 1151
>
=== message truncated ===
______________________________________________________________________
Post your free ad now! http://personals.yahoo.ca
|
