Interactions between pool geometry and hydraulics

Water Resources Research
By: , and 



An experimental and computational research approach was used to determine interactions between pool geometry and hydraulics. A 20-m-long, 1.8-m-wide flume was used to investigate the effect of four different geometric aspects of pool shape on flow velocity. Plywood sections were used to systematically alter constriction width, pool depth, pool length, and pool exit-slope gradient, each at two separate levels. Using the resulting 16 unique geometries with measured pool velocities in four-way factorial analyses produced an empirical assessment of the role of the four geometric aspects on the pool flow patterns and hence the stability of the pool. To complement the conclusions of these analyses, a two-dimensional computational flow model was used to investigate the relationships between pool geometry and flow patterns over a wider range of conditions. Both experimental and computational results show that constriction and depth effects dominate in the jet section of the pool and that pool length exhibits an increasing effect within the recirculating-eddy system. The pool exit slope appears to force flow reattachment. Pool length controls recirculating-eddy length and vena contracta strength. In turn, the vena contracta and recirculating eddy control velocities throughout the pool.

Publication type Article
Publication Subtype Journal Article
Title Interactions between pool geometry and hydraulics
Series title Water Resources Research
DOI 10.1029/1998WR900004
Volume 34
Issue 12
Year Published 1998
Language English
Publisher American Geophysical Union
Description 9 p.
First page 3673
Last page 3681
Google Analytic Metrics Metrics page
Additional publication details