Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Engineering
A Comparison Of Zinc Levels In Runoff From Rubberized Hot Mix Asphalt And Conventional Pavement, Peter A. Duin
A Comparison Of Zinc Levels In Runoff From Rubberized Hot Mix Asphalt And Conventional Pavement, Peter A. Duin
Cal Poly Humboldt theses and projects
High levels of dissolved zinc in water bodies can be toxic to aquatic organisms. There are currently over 40 waterways in California that have on occasion been in exceedance of Clean Water Act minimum toxicity threshold standards for zinc. Recycled tires that contain 1-2% zinc by mass are commonly used in California paving formulations known as Rubberized Hot Mix Asphalt (RHMA). The addition of tires to RHMA increases the zinc content of the pavement in comparison to conventional HMA. This research assesses the zinc content and leaching rate of RHMA in field and laboratory settings to estimate its contribution of …
An Investigation Of The Hydraulics In A Prototype Pool-And-Chute, Vortex Weir Fishway For Anadromous Fish Passage., Brendan Foster
An Investigation Of The Hydraulics In A Prototype Pool-And-Chute, Vortex Weir Fishway For Anadromous Fish Passage., Brendan Foster
Cal Poly Humboldt theses and projects
This thesis presents the hydraulic characteristics and simulated passage efficiency of a hybrid pool-and-chute, vortex weir fishway designed by Michael Love & Associates. A physical 1:15 scale model was constructed and evaluated at an 8% slope over three prototype flow rates representing high and medium fish passage flows. The highest velocities and turbulent kinetic energy (TKE) values were concentrated along the fishway centerline at the high and medium flow rate and the pool sides showed lower velocities and TKE. Large eddies spin laterally and longitudinally throughout each pool. The velocity vector directions at the lowest flow rate measured differed from …