IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 33rd Congress - Vancouver (2009) : Topic B: Water Engineering in Support of Built Environments : Air migration analysis of the terror lake tunnel
Air migration analysis of the terror lake tunnel
Author : K. D. Nielsen and A. L. Davis
The Four Dam Pool Power Agency operates a hydroelectric facility at Terror Lake which is located in a remote region near the City of Kodiak, Alaska. After some tunnel modifications, a 30 inch vent pipe located adjacent to the gatehouse at Terror Lake was observed spouting a mixture of air and water high into the air. According to observers, the geyser spouted for approximately 30 seconds followed by approximately 45 seconds with no air/water exhaust. The cyclic action was repeated several times before dying out. Damage from these events was limited to road erosion but there were concerns regarding the future effects of the violent air releases on the gatehouse structure and tunnel vent. A study was commissioned in 2004 to identify mechanisms that produced the geyser and to propose either operational or structural changes that would eliminate or minimize the
problem. The study included the review of available air migration mechanisms and application of several predictive equations for air migration. In addition, a Computational Fluid Dynamics (CFD) model was developed to determine detailed hydraulics and perform air migration simulations. This paper presents a summary of the air migration mechanics, provides a comparison of air migration predictive equations, and illustrates the use of CFD simulations for analysis of air migration in closed conduit systems.
File Size : 699,904 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 33rd Congress - Vancouver (2009)
Article : Topic B: Water Engineering in Support of Built Environments
Date Published : 09/08/2009
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