Thursday
Oct252018

When dynamic equilibrium loses its equilibrium

I attended a workshop on stream erosion.  Stream systems are customarily understood to be in a state of dynamic equilibrium.  Many historical maps and aerial photos show traces of former channels that have been abandoned over and again.  Today’s stream channel is temporary and dynamic.  As long as rainfall, runoff, sediment load, etc. remain fairly constant, then the system will find its own point of equilibrium- hence ‘dynamic equilibrium.’  Changing rainfall patterns, paving the soil etc. changes the system, throwing the equilibrium into a wobble.  Many streams are now unstable and seeking a stable configuration.  The result is erosion, flooding, sedimentation- often at significant costs.  So the workshop is important and the message is crucial.

Tuesday
Jul172018

Europa's Ocean Ascending

Literally Very Cool - modeling of crustal deformation of the icy crust of Europa.  See the entire gif here.

Friday
Jan052018

Lost Roman roads could be found as Environment Agency laser scans whole of England from air - The Telegraph

There are many technologies that are changing how we view the world.  We are accumulating vast quantities of rich, deep data.  I think it will take us a long time to grasp everything LIDAR will reveal to us.

 

Thursday
Dec212017

USGS & CDC Estimate about 2.1 million people use wells high in arsenic

It's common to run into arsenic in soils and groundwater here in Midwest.  If you operate a well for your drinking water supply, get it tested.

 

Your state geological survey and local water monitoring council provide a lot of information on arsenic in drinking water - a great place to start for citizens with questions and concerns about arsenic in their drinking water.  Here is a link to the Indiana Water Monitoring Council's arsenic pages.

Tuesday
Nov292016

Salt storage impact to potable water supply

Xenon completed an electromagnetic survey to map the distribution of chlorides in shallow soils in the vicinity of a supply well.  Magnetic gradiometry data were collected to evaluate the presence of abandoned well casings.  The results are compelling and show the influence of previously unmapped utility corridors that were likely installed for an interment camp that was located at the site in the 1940s. 

This image shows areas of increased conductivity (red-orange) that are attributed to chloride content with distinctly linear anomalies interpreted as underground utilities.  Soil sampling corroborated the results.background imagery per Google Earth Pro.