Effects of imbedded perforated pipes on permeability of gravelly stream beds Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6m311r467

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  • Perforated pipes were buried in the gravel bed of a laboratory stream, extending upstream from a simulated riffle in order to study their effect upon mixing and interchange of stream water and intragravel water. In the absence of such pipes the drop of energy gradient of the stream was concentrated locally at the riffle whereas the perforated pipes caused the local drop of hydraulic gradient to occur over an extensive portion of the gravel bed due to the direct connection of the pipes with the flow downstream of the riffle. The resulting increase in interchange of stream and intragravel water would be directly beneficial to fish eggs and hatched fry in the gravel pore space by permitting a greater supply of dissolved oxygen to reach them and thus reducing the risk of suffocation. A significant difference in the permeabilities of gravel beds with and without imbedded perforated pipes was found after the same amount of fine sediment was applied to each bed. The much higher final permeability of the gravel streambed containing imbedded pipes suggests that perforated pipes might be of considerable use in reducing silt deposition in spawning gravels and thus minimizing exit-route blockage and environmental stresses for the hatched fry.
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