sand

DIY Recirculating Stream Table

 

originally posted at http://www.mrhollisterphoto.com/stream-table.html, updated 1/8/16, reposted with permission

How to Make a Great Recirculating Stream Table on the Cheap (Less than $50)

DIY Stream Table Time Lapse [youtube]
DIY Stream Table Profile [youtube]

Measuring porosity in flume experiments with a sand bed

  1. After completing a flume experiment, carefully drain the flume of just enough water so that water surface is at the sand bed.
  2. Collect (say with a short PVC pipe) a section of sand.
  3. Measure the mass of this section (=mwet)
  4. Put sample into oven to cook off all water.
  5. Measure the mass of the dry sample (=mdry)
  6. Given knowledge of sand density (=rhosand) and water density (=rhowater), then porosity (lambda) can be computed as: