Aquaplaning: an investigation of surface flow calculation

Sheridan, Liam (2014) Aquaplaning: an investigation of surface flow calculation. [USQ Project]

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Abstract

This research project will numerically analyse current methods used for calculating surface flow depth and the accuracy of different models. It will model the surface flow build up over the duration of a design storm event using the standards values which are determined from the following research and documentation.

This research project compares the accuracy and reliability of surface flow calculation methods including the Gallaway Equation, Manning’s Equation and a kinematic wave equation model. The research reviews current design rainfall intensity values as well as other input variables such as texture depth, acceptable flow depth and driver behaviour and determines if they are suitable for study of aquaplaning analysis.

Current standards outline procedure for choosing input variable based on the conditions. These have been based on historical studies and still seem applicable to today. A design rainfall intensity of the 1 year ARI, 5 minute duration or 50mm/h, whichever is the lesser, is chosen to account t for driver behaviour and time of concentration. The standard texture depth should be chosen depending on the specified pavement type or determined by on site testing if available.

The Gallaway equation provides a fast a simple method to calculate depth however in areas of particular concern or risk a more extensive hydraulic analysis with the use
of the kinematic wave equations may be warranted. The RRL method produce high depths of flow and is therefore no recommended for use in Australia.

This research investigates the time of concentration and surface drainage of the flow path to assess the aquaplaning risk over time. The results suggest the maximum flow
depth conditions will be reached for surface drainage catchments after approximately 5 minutes and the depth will subside to below critical depth within 5 minutes of the
cessation of the rainfall.


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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor Engineering/Bachelor Business project.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Supervisors: Gillies, Malcolm
Date Deposited: 09 Sep 2015 05:14
Last Modified: 09 Mar 2016 02:39
Uncontrolled Keywords: aquaplaning; aquaplane; water depth; surface flow; rainfall; surface drainage
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090599 Civil Engineering not elsewhere classified
URI: http://eprints.usq.edu.au/id/eprint/27309

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