Wednesday, October 17, 2007

Where on Google Earth #62


With some help from Wikipedia, I found that the image posted by Joe was from a volcanic field in western Sudan. So here comes WoGE #62.


Compared to the Peruvian meanders, this should be easy. Extra points for knowing the story that this place is a good example of -- there is a specific journal article I am thinking about.

Schott rule in effect (post time 8:22 pm CST, 10-17-07).

Update: Brian has the answer; here is a bit more detail about this image. It's the southernmost distributary of the Danube Delta in Romania, called the Sfantu Gheorghe channel. The geometry of the deposits is determined by (1) the river discharge, (2) the wave energy of the Black Sea, and (3) the southward oriented longshore transport. The asymmetry of the lobe is a function of the ratio between the net longshore transport rate at the mouth and river discharge. The longshore currents erode the beach/barrier bars on the northern side of the channel mouth. More details in this paper. This image also comes from Bhattacharya and Giosan (2003):


Black represents sand, gray is predominantly muddy deposits, and the white arrow at the river mouth shows the direction of longshore drift.

6 comments:

BrianR said...

oh yes...Danube River delta on the western side of the Black Sea!!

I'm not sure which article you are thinking of, but the Danube is a great example of an asymmetric wave-dominated delta. Note the difference between two sides of main river channel. The northern side is being eroded (note truncated scroll bars) and being redeposited on the southern side of the river mouth (note spit).

John Van Hoesen said...

What are the coordinates, still can't find it in that mess. Weird...

Thanks!
JVH

GeologyJoe said...

ZS, on a side note i found it a funny coincidence that a Hungarian geologist solved my woge.
My wife and parents are from Magyar-land and I know how your countrymen really stick together.
So i figured i had to mention it or they might beat me up :)

BrianR said...

oh right...coordinates...sorry

44.909239°
29.538573°

zs said...

Brian - yesss, that's the story I was thinking about. The paper I was referring to is "Wave-influenced deltas: geomorphological implications for facies reconstruction", by Janok Bhattacharya and Liviu Giosan.

Joe - Hungarians do tend to stick together... I guess. Although that's not obvious if you look at Hungarian politics nowadays -- but I don't want to do that anyway.

BrianR said...

Wo(G)E #63 is now up...go here

 
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