Title: problem of spatial continuity of groundwater head
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Kai
There has been some work in this area
there are some references at the Ecole des Mines, Centre de Geostatistique
website .... see the papers by Anne Dong and Chris Roth to start with....
Not all of these are published outside the center - but some are .....for
example Anne's 1988 paper (in English) was in the Avignon Geostats
Conference and the reference is given at the site above
Interesting area ...good luck!
Regards
Colin
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Sent: Tue 11/23/2004 12:16 PM
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Subject: [ai-geostats] problem of spatial continuity
of groundwater head
Hello list,
A few days ago I had a discussion about spatial
continuity of hydraulic heads and the following question: Is it allowed to use
a krging technique for this variable?
First Opinion: there are different processes which
influence the groundwater heads, e.g.:
- gravity (hydraulic gradient)
-
grounwater recharge
- anthropogenic influence (pumping/injection)
So there is a global trend which is overlayed from
different additional trends like groundwater recharge and anthropogenic
influence (pumping/injection) and you canÂt seperate these processes. These
are the reasons that you get problems with the
ergodicity and it is not possible to use kriging techniques, because you
havenÂt a spatial continuity which is based on
one process.
Second Opinion: There is a basic process for the
groundwater heads (the movement based on the Darcy law and thatÂs it) . There
exist a global trend (but you can handle it with Universal kriging) and the
differences depend on the other processes maybe give you another trend by
large scale problems (and then you have problems with the ergodicity and have
to use moving window statistics to divide you working area). So you have a
spatial continuity which is not necesseraly influenced by problems with
ergodicity and you can use kriging techniques. Maybe the anthropogenic
influence could be a process which disturb the spatial continuity.
I know itÂs quite a hydrogeology problem but anyway
I would like to hear your opinion or experiences on that topic.
Looking forward to the answers,
Kai
Dipl. Kai ZoÃeder
Bayerisches Geologisches Landesamt
HeÃstr. 128
D-80797 MÃnchen
Tel.: 089-9214
2655
http://www.bayern.de/gla
http://www.bis.bayern.de
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