Harvest moon over the Ottawa River

Jim Elder

Ottawa, Canada
email

Sand & Dunes

Background

Aeolian dunes and sandstone: Overview (intro, including animations)
Strata dip and thickness: True and apparent

Methods

Making pinstripe laminae visible in dry sand (a refinement of Bagnold's water seep method)
Measuring cross-sectional profiles of dune features (using the shadow of a straight-edge)
Detecting subsurface slipface shear (using a sand column of contrasting colour)
Making air flow visible (using simple streamers)
Making sand flow visible using an adapted Hele-Shaw cell
Measuring dip (eg., angle of repose)
Photographic reference scale (for scale, colour, and perspective)

Observations & Interpretations

Sand micrographs (photos of sand grains)
Air flow in the lee of a dune (recirculation cell)
Cornice deposit (grainfall lee of the brink)
Grainflow (slipface avalanche deposits)

2005 Jan Hele-Shaw Cell: Avalanche Segregation and Stratification
2004 Apr Observations of an Active Dune (including a video of a sandstorm)
2003 Mar A Deformation Feature in Grand Gulch

Utah

2008 May Ravens in Aerobatic Flight
2008 Jan Bentonite (time lapse photography of drying bentonite)
2005 Mar Basque Sheepherder Inscriptions
2004 Dec Multi-angle “3D” Photographs of Some Utah Landscapes (Escalante Canyon, The Thumb)

Photography

2007 Nov Photographic Reference Scale
2006 Oct Comparison of some Ottawa photofinishers (4x6 prints)
2004 Oct Notes on making multi-angle '3D' photographs (including javascript for Photoshop and web display)
2004 Jul Dynamic range of photographs

Miscellaneous

2007 Sep Six Steps to Survival (1955, 'How to survive nuclear war'; US Civil Defense Authority)
2007 Jan Canoeing the Rideau Canal and Trent-Severn Waterway
2006 Dec Charts & Figures from "An Inconvenient Truth"
2006 Dec Emission Spectra of Some Compact Fluorescent Lamps (CFL Bulbs)
2006 Oct Power Consumption of Some Household Appliances
2006 Feb Powering a Dell Inspiron 6000 with a Low-Cost Inverter
2004 Aug Two Mile Time Machine (climate history deduced from Greenland ice cores)
2000 Oct Varietal Features of Wine (an analysis of wine reviews)
2000 Jul Ottawa River wind conditions (open weather data)