Tom Clifton: Fluid Flow: AntidunesAntidunes are bedforms that form in fast, shallow flows. I have been fascinated by them since I was 5. They were even the topic of my dissertation, but that was mainly so I could continue playing in the sand.(Untitled)- February 27, 2002 Discussing Antidunes I had been thinking of creating a new Manila site to host my discussions on antidunes. With the advent of comments, however, I don't think that is necessary. My concern is that I am posting information that has not gone through a formal peer-review process (beyond my dissertation committee). As such, it has not achieved the same level of standard as a scientific journal article. A Weblog like this, however, with its high degree of linking, has the potential for top...http://radio.weblogs.com/0100021/categories/antidunes/2002/02/27.html#a158 (Untitled)- February 11, 2002 Antidune Trivia G.K. Gilbert coined the term "antidune" in a 1914 US Geological Survey Professional Paper entitled "Transportation of debris by running water". The paper reports the results of a series of early flume studies that Gilbert performed at the University of California in Berkeley. I would love to get a copy of this paper for my library. flume studies are a method of studying bedforms and channelized flow. An artificial channel is set up in a laboratory and then flows of various...http://radio.weblogs.com/0100021/categories/antidunes/2002/02/11.html#a115 (Untitled)- February 1, 2002 On the technical details of the image and its line drawing below. In my dissertation, I recognized two distinct types of laminae produced by antidunes. The first, which I call "type 1" lies in sharp erosional contact with the underlying sediment. In my box cores, these thin (<1 mm thick) laminae are defined by fine, magnetite-rich sand with coarser arkosic sand lying gradationally above the laminae. These laminae define the basal portion of a inversely-graded packet of sediment that are...http://radio.weblogs.com/0100021/categories/antidunes/2002/02/01.html#a71 |