Hydraulics

Between three separate locations along the Logan River I observed a handful of hydraulic units which helped cement the ideas

This is Site One where I made the following observations

  • Flow Separation, flow seam, flow reattachment, shear zone

  • Hydraulic jump with critical, subcritical, and supercritical flow points

This is Site Two where I observed

  • Convergent flow

  • Divergent flow

  • As well as sketched/painted a planar sketch highlighting these characteristic patterns


This is Site Three which provided an ample opportunity to make some crude flow calculations

  • Cross-section sketch

  • Estimated discharge

Highlighted in the picture (left) is an image that shows flow separation on the north bank at Site One

  • Flow separation , pink arrows

  • Flow beginning to converge/ reattach, green arrows

  • The blue arrow on the left side highlights more of a wake type shear zone, while the arrow on the left shows an eddy where the flow is returning upstream

  • The green arrows begin to highlight where the flow is reattaching and becoming consistent once again

  • Field sketch last page


IMG_5919 3.MOV

Narrated hydraulic jump at Site One

At Site Two in the planar image I labeled examples of geomorphic units I noticed. In the field sketch I indicated convergent and divergent flow as well as arrows that highlighted flow direction and magnitude.


Site Three provided a bridge and a relatively consistent cross-section profile, this allowed for an easy discharge estimate. Upstream of the bridge I also took note of uniform flow, both highlighted on the left.

  • Calculated velocity using a stick dropped in the estimated average flow point and took note of the time it took to travel a measured distance

  • Q= V *A

  • 58.8 cfs