Subject: questions to atczsk<br/>
Date: Sep 17, 2006 @ 14:17<br/>
Author: aletheia kallos (aletheia kallos &lt;aletheiak@yahoo.com&gt;)<br/>
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<br/><br/>
<div id="ygrps-yiv-1866864933">clearly the tripoint is where the thaya joins the<br/>
morava<br/>
<br/>
atcz is thaya <br/>
czsk upper morava<br/>
atsk lower morava<br/>
<br/>
but not having seen any of the treaties<br/>
i dont know if the boundaries follow the thalwegs <br/>
or the median lines<br/>
or some other regime<br/>
<br/>
& the answer to that question would make a difference<br/>
in the location of the tripoint<br/>
since thalweg junctions tend to produce oblique wye<br/>
shapes that meet farther downstream than do midline<br/>
junctions <br/>
which are typically reckoned & represented as abrupt<br/>
rectilinear tees<br/>
even if the confluences are wye shaped<br/>
<br/>
but my guess is <br/>
these rivers are not navigable in this location by<br/>
deep draft vessels<br/>
& thus that the boundaries follow the median lines in<br/>
all 3 cases<br/>
<br/>
& if i am correct about that<br/>
then i believe the tripoint is pretty much where<br/>
jesper has pinned it<br/>
or perhaps very slightly below<br/>
as i will try to explain<br/>
<br/>
but if my guess is mistaken & the borders do follow<br/>
the thalwegs<br/>
then i think the tripoint would fall so far downstream<br/>
as to be not only outside the pushpin circle <br/>
but possibly even as far downstream as the yellow line<br/>
<br/>
now <br/>
how to find out which principle of delimitation is the<br/>
actual one<br/>
& indeed whether the principle is the same for all 3<br/>
convergents<br/>
<br/>
for in fact <br/>
other slightly different positions would result if the<br/>
principles turned out to be other than these two <br/>
& or turned out to be not the same on all 3 borders<br/>
<br/>
like say what if the morava proved to be navigable<br/>
here & the thaya not<br/>
or something weird like that<br/>
<br/>
for in fact the 1911 britannica for example says only<br/>
the morava is at all navigable<br/>
& only for an unspecified stretch<br/>
<br/>
& of course in times of drought the whole question<br/>
waxes academic<br/>
since thalwegs & medians & everything else in slack<br/>
water converge toward perfect agreement anyway<br/>
<br/>
<br/>
but can anyone settle any of this<br/>
<br/>
<br/>
in the meantime<br/>
no tripoint stretching diagram per se<br/>
<br/>
rather the white line between little red squares on<br/>
the attached overzoomed satpic <br/>
tries only to connect the midpoint of the thaya mouth<br/>
just where it kisses & joins the morava<br/>
at left <br/>
to the corresponding & perpendicular midpoint of the<br/>
morava <br/>
at right<br/>
<br/>
& i believe this actually represents a conventional<br/>
tripointing stitch that is sometimes performed by<br/>
boundary makers & cartographers in such a case of<br/>
midline junctioning<br/>
if indeed this is such a case<br/>
<br/>
but at any rate<br/>
in this case<br/>
the righthand red square does represent my best<br/>
guessed atczsk<br/>
<br/>
& in acknowledgment & salute to jesper <br/>
well within the pushpin circle when viewed at normal<br/>
viewing range<br/>
<br/>
<br/>
& again<br/>
all of this is offered very modestly & sketchily &<br/>
with a request for the much needed better data <br/>
<br/>
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