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Articles 1 - 4 of 4
Full-Text Articles in Civil 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 …
Assessment Of Individual Photovoltaic Module Performance After 26 Years Of Field Exposure At The Telonicher Marine Lab In Trinidad, California, Jake Rada
Projects
In 1990, 192 ARCO M75 photovoltaic (PV) modules were installed as a part of the Schatz Solar Hydrogen Project at the Humboldt State University (HSU) Telonicher Marine Lab in Trinidad, California, within 150 m of the Pacific Ocean. This 9.2 kW-rated PV array was used to power the marine laboratory air compressor and an electrolyzer. Individual current-voltage (IV) curve tests were performed on each of the PV modules prior to the array’s construction in 1990 and again in 2001, 2010, and, most recently, in 2016, following decommissioning of the array. After 25.5 years of use, 188 of the original 192 …
Water Quality Evaluation Of Tire Derived Aggregate, Richela K. Maeda
Water Quality Evaluation Of Tire Derived Aggregate, Richela K. Maeda
Projects
The primary objective of this study is to investigate the rate that potential water quality contaminants leach from tire-derived aggregate (TDA) as a function of time. A laboratory and field experiment is conducted to provide insight into both controlled and field settings. The laboratory portion of this study also provides a basis for evaluating the effect that alternating periods of wet and dry weather have on the potential water quality impacts of the leachate as compared to the worst-case operating condition, when TDA is constantly submerged (i.e., when placed below the permanent groundwater table). The field experiment is used to …