Re: Scouring/deposition of inter-tidal mud

"Carsten Troelsgaard" <carsten.troelsgaard@xxxxxxx> wrote in message
news:438768ab$0$145$edfadb0f@xxxxxxxxxxxxxxxxxxxxxxx
>
> "N Cook" <diverse@xxxxxxxxx> skrev i en meddelelse
> news:dm74tr$npn$1@xxxxxxxxxxxxxxxxxx
> > "Carsten Troelsgaard" <carsten.troelsgaard@xxxxxxx> wrote in message
> > news:4386e8e9$0$156$edfadb0f@xxxxxxxxxxxxxxxxxxxxxxx
> >>
> >> "N Cook" <diverse@xxxxxxxxx> skrev i en meddelelse
> >> news:dm6h0g$dc0$1@xxxxxxxxxxxxxxxxxx
>
> > Assuming these maps download complete with overlaid red circles
> > The area of interest is just to the east of the red circle on
> > local map
> >
http://www.multimap.com/map/browse.cgi?client=public&search_result=&db=pc&ci
> >
dr_client=none&lang=&pc=SO172HS&advanced=&client=public&addr2=&quicksearch=s
> > o172hs&addr3=&addr1=
> > or
> > http://tinyurl.com/c4xrq
> > the main channel is biased well to the south of mid stream.
> > There is no local minor tributory at the site.
> >
> > regional context , Southampton , Hampshire , UK
> >
http://www.multimap.com/map/browse.cgi?client=public&X=443000&Y=114000&width
> >
=700&height=400&gride=443316&gridn=113717&srec=0&coordsys=gb&db=pc&addr1=&ad
> >
dr2=&addr3=&pc=SO172HS&advanced=&local=&localinfosel=&kw=&inmap=&table=&ovty
> > pe=&zm=0&scale=25000&out.x=6&out.y=9
> > or
> > http://tinyurl.com/awl5y
> >
> > Freshwater is minor input at point marked Woodmill Lane on the regional
> > map
>
> Ok, much of what I wrote doesn't seem apply very well to the setting. I'm
> afraid that I'll have to leave it for a local geologist with
local/regional
> knowledge. One of the keys could be weather your region subside or rise
from
> glacial rebound - it's probably influenced by a minor subsidence on the
> peripheral bulge that rose outside the rim of the ice, and now subsides
back
> in place. This effect has a major influence in southern Denmark, coastal
> Germany and Holland in coastal-plain areas ... and your neighbourhood is
> not.. a coastal plain? This is my next question - your maps doesn't
provide
> topographic information, but from memory, you probably live on a rather
> solid piece of land bordering the chanel, and the river somewhat cut down
in
> the subsurface rather than meandering freely across a flat flood-plain?
The
> meanders are obvious on the map, but the trumpet shaped rivermouth takes
me
> somewhat out of my habitual thinking of a delta as a place of preferential
> deposition.
> Anyway, this is becomming free speculation. There is quite a lot of uk
> geologists in the group, so they should give it a shot.
> If the burial/emergence of the stubs is a reocurring phenomena, you may be
> able to evaluate local migrating barres on your own, studying stream
> patterns. If the covering sediment is mud, as you say, then it ought to be
a
> one-way ocurrence .. mud is difficult to erode, once settled. The quiet
gain
> of land in tidal areas is through the settling of mud at high tide,
mediated
> by organisms that facilitate aggregation of the colloides in the water
into
> faecal pellets. The pellets drop out of suspension whereas the colloides
> would have gone back to sea.
>
> Carsten
>
>


One major contribution to deposition could well be a storm water outfall at
the sewage works a half mile up stream of the site. When a severe rainstorm
hits the area the river is turned yellow from this then silt laden outflow.


.

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