Johns Hopkins University Applied Physics Lab
11100 Johns Hopkins Road, Laurel,
Maryland 20723-6099, USA
tel. 443-778-2903 fax. 443-778-8939
Review Article on the history and applications of dust devil
Paper Pictures and near-IR video Papers and Data Paper and Datafile Pictures
Paperon the composition of Titan's seas - why Ligeia Mare is 'fresh' (methane-rich), flushed with rainfall, while Kraken Mare has a higher 'salinity' (ethane,propane etc.), rather like the Black Sea/Mediterranean. My APL web page has a somewhat up-to-date publications list.
Pictures and near-IR videoof active volcanos on Vanuatu.
Papers and Dataon dust devil field research. Includes pressure time series and some hundreds of vortex detections.
Paper and Datafileon a radar map of Titan seas, analytic bathymetry and tidal flows through the Throat of Kraken.
Picturesfrom trip to Namibia.
My first paper on Tatooine !
Paperaccepted for publication in the journal Geomomorphology on the movement of barchan dunes at the Star Wars film set in Tunisia.
Global Topographic Map of Titan Images, Data and Paper
Out Now! My book with Jim Zimbelman on planetary dunes, to be published by Springer
Researches on Moving Rocks at Racetrack Playa, Death Valley : A paper describing meteorological conditions at the playa. A paper showing that the principal role of ice in facilitating movement is by providing buoyancy that lifts a rock off the lake bed ('rafting'), not the augmentation of wind drag area ('sailing'). A paper examining the record of changes, suggesting climate change has caused the frequency of track formation to decrease by a factor of 4 since the 1970s. Finally, in winter 2013/2014 Lorenz and Jim and Dick Norris observed and documented rock movement, in a paper published in PLoS One and a companion paper submitted to Earth Surface Dynamics . Pictures and Videos are at www.racetrackplaya.org
Kite camera picture Pictures Pictures Pictures Pictures Pictures 120MB! Timelapse Movie Pictures Timelapse Movie (m2v) Quicktime (5MB) Some Notes Pictures
Kite camera pictureat White Sands National Monument.
Picturesfrom trip to the United Arab Emirates.
Picturesfrom trip to frozen methane seeps in Barrow, Arctic Alaska.
Picturesfrom trip to the Lawn Hill impact structure, Australia.
Picturesfrom Planetary Dunes trip to Flagstaff and Meteor Crater.
Picturesfrom Trip to see Annular Solar Eclipse at Bryce Canyon, UT.
120MB! Timelapse Movie[(c) Ralph Lorenz, 2011] of combined sand and snow movement at GSDNPP in February 2011.
Picturesfrom Trip to Ethiopia - the Rift Valley, the Danikil Depression including Dallol and the Erta Ale lava lake!
Timelapse Movie (m2v)[(c) Ralph Lorenz, 2011] of wind ripple movement over several days at Great Sand Dunes National Park, Colorado.
Quicktime (5MB)[(c) Ralph Lorenz, 2011]
Some Noteson the setup. A paper describing the ripple movement over 70 days, and its relationship to wind conditions, has been published in Geomorphology.
Picturesfrom Trip to Egypt.
Timelapse movies [(c) Ralph Lorenz, 2010] of Simple aeolian ripple motion over an hour or so and Compound ripples on a linear (seif) dune at Quattani, Egypt. (NB better versions will be forthcoming as soon as I get some video-editing software. My raw movie data is higher resolution and longer than shown here, contact me for details.) A
Videoof lecture on Titan at SETI Institute, August 2010
Picturesfrom Trip to Xian and Jaiyuguan, China
Picturesfrom BBC film shoot in Alaska
Picturesfrom field trip to Australian outback
Picturesfrom field trip to Tunisian desert
Picturesfrom trip to Waqf as Suwwan impact structure, Wadi Rum, Dead Sea and Petra, Jordan
| New! R. Lorenz and J. Mitton |
Princeton University Press, April 2008
Buy from Amazon.com
| Harland and Lorenz |
Space Systems Failures
Praxis/Springer,May 2005 Buy from Amazon.com
| Ralph Lorenz |
Spinning Flight: Dynamics of Frisbees, Boomerangs, Samaras and Skipping Stones
Springer/Copernicus,Summer 2006 Buy from Amazon.com
| R. Lorenz and J. Mitton
Lifting Titan's Veil |
Cambridge May 2002 Buy from Amazon.com
| Kleidon and Lorenz |
NonEquilibrium Thermodynamics and the Production of Entropy
December 2004 Buy from Amazon.com
| Ball, Garry, Lorenz and Kerzhanovich|
Planetary Landers and Atmospheric Entry Probes
Cambridge, March 2007 Buy from Amazon.com