For some reason the last few days have seen me browsing the semi-frozen areas of the Earth and in my search for the perfect thermokarst landscape, I’ve run across some really nice deltas. I don’t know anything about the one below other than its location in far northwestern Saskatchewan, but …
About two months ago, I noted with great sadness the passing of a legendary figure in fluvial geomorphology, M. Gordon “Reds” Wolman, long-time professor at The Johns Hopkins University and inspiration to hundreds, if not thousands, of geomorphologists, hydrologists, and environmental scientists around the world. In the past two months, …
The Chippewa River drains the glaciated terrains of north-central Wisconsin including major outwash plains from the margins of the Laurentide Ice Sheet. The sand carried by the Chippewa is a major sediment source for the Upper Mississippi River for tens of miles downstream. The Chippewa forms a beautiful delta into …
I spent a summer in college staring at maps and aerial photographs of the Rio Grande delta in Texas and Mexico. Maybe now I can get some use out of it. I was working with J.D. Stanley at the Smithsonian’s NMNH and he pointed me to the apparently high sinuosity …
Hunting for a Where on Google Earth location a while ago I ran across this wonderful tidally-influenced delta on the northwest coast of Madagascar. It is the mouth of the Betsiboka River and just north of the river mouth is the second largest port in Madagascar. What struck me about …
More than one billion people (1 in 6) do not have access to adequate clean fresh water – which is defined as just 20 to 50 liters per day. (In contrast, the average American can use in excess of 400 liters per day indoors.) More than 2.5 billion people do …
Watershed Hydrogeology Lab graduate student Brock Freyer has spent the last two years learning deeply about the hydrology, geomorphology, and sedimentology of the Upper Mississippi River System, as well as learning to use some sophisticated GIS techniques for 3-D analysis of topographic data. This week he is presenting the results …
Boundary Layers and the no slip condition [youtube=http://www.youtube.com/watch?v=cUTkqZeiMow] Laminar Flow in a Pipe [youtube=http://www.youtube.com/watch?v=KqqtOb30jWs&NR=1] Turbulent Flow in a Pipe [youtube=http://www.youtube.com/watch?v=NplrDarMDF8&NR=1] Subcritical and supercritical flow over a weir (video courtesy of Little River Research and Design) Standing Waves [youtube=http://www.youtube.com/watch?v=rFOt-oOUzJY]
This post is cross-posted at Highly Allochthonous. Please look over there for 15+ comments on the post. Meandering rivers are characterized by regularly spaced bends that grow and cutoff and generally march downstream in a fairly orderly fashion. Click the image below to watch a movie of meander migration on …
The Watershed Hydrogeology Lab is going to be busy at this year’s Geological Society of America annual meeting in Portland, Oregon in October. We’ve submitted four abstracts for the meeting, I am co-convening a session, and I’ll be helping lead a pre-meeting field trip. I’ll be an invited speaker in …