Peggy A. Johnson
Pennsylvania State University
67 Papers
591 Citations
Peggy A. Johnson is an academic researcher from Pennsylvania State University. The author has contributed to research in topics: Bridge scour & Stream restoration. The author has an hindex of 24, co-authored 67 publications. Previous affiliations of Peggy A. Johnson include University of Wyoming & University of Pennsylvania.
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Papers
Uncertainty in estimating bankfull conditions
Peggy A. Johnson,Thomas M. Heil +1 more
TL;DR: In this paper, the relative uncertainty in determining the bankfull depth and discharge is quantified, first by examining the variability in the estimates of bankfull and second by using fuzzy numbers to describe bank full depth.
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Comparison of Pier-Scour Equations Using Field Data
TL;DR: In this article, the authors compare seven bridge-pier-scour equations using a large set of field Data for both live-bed and clear-water scour will be examined; although during most floods the stream bed is live, th
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Use of Vanes for Control of Scour at Vertical Wall Abutments
TL;DR: In this paper, the effectiveness of vanes for preventing scour at single-span bridges with vertical wall abutments was evaluated based on laboratory experiments and the results showed that the vanes were highly effective in moving the scour away from the abutment into the center of the channel under all flow conditions tested.
121
Water Balance of Blue Nile River Basin in Ethiopia
TL;DR: In this article, the authors presented existing streamflow data for the Blue Nile River and its tributaries within the blue Nile River basin in Ethiopia and used that data to provide insight into the river's hydrology in Ethiopia.
79
Performance of Two Real-Life California Bridges under Regional Natural Hazards
TL;DR: In this paper, the performance of two real-life California bridges is assessed under a possible regional multihazard condition involving floods and earthquakes, and the fragility curves of bridges are developed at component and system levels.
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