Date of Award:

5-2021

Document Type:

Thesis

Degree Name:

Master of Science (MS)

Department:

Civil and Environmental Engineering

Committee Chair(s)

Brian M. Crookston

Committee

Brian M. Crookston

Committee

Blake P. Tullis

Committee

Austin Ball

Abstract

Sustainable flood control infrastructure is needed as climate change continues to produce more extreme precipitation events, as our water infrastructure continues to age, and as populations continue to grow and expand. Non-linear weirs, such as labyrinth and piano key weirs, are sustainable passive flood-control structures due to their improved hydraulic performance, and low maintenance and construction costs. However, like other structures, these weirs are susceptible to local scour, which is removal of soil and rock due to hydraulic forces. The scour phenomenon is a complicated process dependent upon multiple variables. There is limited information for non-linear weirs with little directed to practitioners attempting to design scour protection measures for these structures. Due to this lack of information, a laboratory study is performed to consider scour morphology and evolution, scour prediction, and scour mitigation techniques that could be employed by practitioners. Hydraulic conditions affect the scour intensity, the time it takes to reach equilibrium, and the overall scour morphology. Published scour prediction equations are evaluated to determine the relative accuracy in estimating maximum geometric scour features at piano key weirs. Using published scour prediction equations, new scour mitigation design equations are generated to assist practitioners in the development of aprons lengths and cutoff wall depths for piano key weirs.

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