tsunami, hurricane, engineering with nature, natural and nature-based features, mangroves, physical model
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Description:
This project investigated the potential of mangroves as a natural and nature-based option for coastal flood hazard mitigation through construction of a 1:16- geometric scale physical model, based on post-storm damage assessments following Hurricane Irma (2017) indicated that mangroves of modest cross-shore thickness (O~20m) shielded inland structures and mitigated damage compared to other shoreline treatments. Transient and random waves were generated across an idealized mangrove test section of two cross-shore widths as well as a baseline case to measure mangrove effects on hydrodynamics and loads on sheltered inland structures. This project was part of the experimental campaign, "Collaborative Research: Wave, Surge, and Tsunami Overland Hazard, Loading and Structural Response for Developed Shorelines," with collaborators from the United States Naval Academy, University of Notre Dame, Oregon State University, University of Southern California, University of Hawaii at Manoa, and Hanyang University.
Experiment | Transient Wave Transformation though Reduced-Scale Physical Model of Mangrove Forests of Moderate Cross-Shore Width
Cite This Data:
Tomiczek, T., D. Cox, P. Lomonaco, A. Wargula, A. Kennedy, P. Lynett, T. Maddux (2021). "Transient Wave Transformation though Reduced-Scale Physical Model of Mangrove Forests of Moderate Cross-Shore Width", in Experimental Investigation of Wave, Surge, and Tsunami Transformation Over Natural Shorelines: Reduced Scale Physical Model. DesignSafe-CI. https://doi.org/10.17603/ds2-j0j1-5827
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Author(s)
; ; ; ; ; ;
Facility
Large Wave Flume and Directional Wave Basin - Oregon State University
Experiment Type
Wave
Equipment Type
Directional Wave Basin (DWB)
Date of Experiment
2019-03-11 ― 2019-03-25
Date Published
2021-08-08
DOI
10.17603/ds2-j0j1-5827
License
Open Data Commons Attribution
Description:
Experiments measured hydrodynamics (water surface elevation, velocities) in front of and behind a model mangrove forest of two moderate cross-shore widths. Pressures and loads on sheltered inland structures were also measured to investigate load reduction by mangroves. Tests were performed in the Directional Wave Basin at O.H. Hinsdale Wave Research Laboratory at Oregon State University. Experimental outcomes indicated that the presence of mangroves significantly affected water levels and peak cross-shore velocities behind the forest, and increasing mangrove cross-shore thickness reduced wave loads on the sheltered inland structural elements. The relationship between increasing cross-shore thickness and load reduction was not linear; the relative benefit of increased cross-shore thickness was affected by the amplitudes and representative time scales of the transient waves. Data can be reused to validate computational models and for comparison with other physical model investigations of mangrove effects on wave transformation and load reduction.
Report | Read Me First: Description of Experiments
Description:
Overview report of experimental dataset describing model configurations, instrumentation, sampling rates, and hydrodynamic conditions.
File Name
README
Analysis | vICCE Presentation: Physical Model Investigation of Modest Thickness Mangrove Forest Effects on Flow Hydrodynamics, Pressures, and Loads in the Built Environment
Description:
Presentation given by Tori Tomiczek at vICCE 2020 disseminating experimental background, methodology, and results.
File Name
Model Configuration | Baseline Configuration: Zero Mangroves
Description:
Waves were generated over the test section with no mangroves present in this model configuration to obtain a baseline measurement of wave hydrodynamic transformation and measure pressures and loads on unshielded structures.
File Name
ImageDirectional Wave Basin
Sensor Information | Idealized Structure Locations
Description:
xy coordinates of idealized structures positioned on the test section. Coordinates are with respect to the DWB coordinate system.
File Name
Sensor Information | Instrumentation Locations
Description:
xyz coordinates of instrumentation, based on DWB coordinate system.
File Name
Event | Currents - Baseline
Description:
Pumps generated a steady current through the test section to measure water velocities, water surface elevation, and pressures and forces on the inland structures. Water depth at the wavemaker was 1.09 m, resulting in a depth at the mangrove test section of 0.09 m (60% submergence of the roots).
Transient waves were generated with an error function with depth at wavemaker = 0.98 m and test section fully emergent. Three trials were generated using error function scale factor (SF) 200, SF 300, and SF 400, with increasing SF resulting in increased representative time scale and decreased wave amplitude.
Transient waves were generated with an error function in the presence of a steady current through the test section. Water depth at the wavemaker was 1.09 m, resulting in a depth at the mangrove test section of 0.09 m (60% submergence of the roots). Three trials were generated using error function scale factor (SF) 200, SF 300, and SF 400, with increasing SF resulting in increased representative time scale and decreased wave amplitude.
Model Configuration | Four Rows of Mangroves (Cross-Shore Thickness = 0.51 m model scale, 8.2 m full scale)
Description:
Waves were generated over the test section with four rows of mangroves present (cross-shore thickness = 0.51 m at model scale, 8.2 m at prototype scale) in this model configuration to investigate the effect of adding mangroves on wave transformation and load reduction.
File Name
ImageDirectional Wave Basin
Sensor Information | Mangrove Specimen
Description:
Parameters of idealized mangrove specimens installed in the Four Rows and Eight Rows Configurations. Specimens were spaced (trunk-to-trunk) at 0.17 m in the cross-shore (x-) direction and 0.19 m in the along-shore (y-) direction.
File Name
Sensor Information | Mangrove xyz locations.
Description:
xyz coordinates of mangrove locations and ground control points for experiments, with respect to the DWB coordinate system.
File Name
Sensor Information | Idealized Structure Locations
Description:
xy coordinates of idealized structures positioned on the test section. Coordinates are with respect to the DWB coordinate system.
File Name
Sensor Information | Instrumentation Locations
Description:
xyz coordinates of instrumentation, based on DWB coordinate system.
File Name
Event | Currents - Four Rows
Description:
Pumps generated a steady current through the test section to measure water velocities, water surface elevation, and pressures and forces on the inland structures. Water depth at the wavemaker was 1.09 m, resulting in a depth at the mangrove test section of 0.09 m (60% submergence of the roots).
Transient waves were generated with an error function with depth at wavemaker = 0.98 m and four rows of mangroves on the test section, fully emergent. Three trials were generated using error function scale factor (SF) 200, SF 300, and SF 400, with increasing SF resulting in increased representative time scale and decreased wave amplitude.
Transient waves were generated with an error function in the presence of a steady current through the test section with four rows of mangroves present. Water depth at the wavemaker was 1.09 m, resulting in a depth at the mangrove test section of 0.09 m (60% submergence of the roots). Three trials were generated using error function scale factor (SF) 200, SF 300, and SF 400, with increasing SF resulting in increased representative time scale and decreased wave amplitude.
Model Configuration | Eight Rows of Mangroves (Cross-Shore Thickness = 1.19 m model scale, 19.0 m full scale)
Description:
Waves were generated over the test section with eight rows of mangroves present (cross-shore thickness = 1.19 m at model scale, 19.0 m at prototype scale) in this model configuration to investigate the effect of doubling the cross-shore thickness of mangroves (relative to the Four Rows Configuration) on wave transformation and load reduction.
File Name
ImageDirectional Wave Basin
Sensor Information | Mangrove Specimen
Description:
Parameters of idealized mangrove specimens installed in the Four Rows and Eight Rows Configurations. Specimens were spaced (trunk-to-trunk) at 0.17 m in the cross-shore (x-) direction and 0.19 m in the along-shore (y-) direction.
File Name
Sensor Drawing
Sensor Information | Mangrove xyz locations.
Description:
xyz coordinates of mangrove locations and ground control points for experiments, with respect to the DWB coordinate system.
File Name
Instrument Survey
Sensor Information | Idealized Structure Locations
Description:
xy coordinates of idealized structures positioned on the test section. Coordinates are with respect to the DWB coordinate system.
File Name
Instrument Survey
Sensor Information | Instrumentation Locations
Description:
xyz coordinates of instrumentation, based on DWB coordinate system.
File Name
Sensor ListInstrument Survey
Event | Currents - Eight Rows
Description:
Pumps generated a steady current through the test section to measure water velocities, water surface elevation, and pressures and forces on the inland structures. Water depth at the wavemaker was 1.09 m, resulting in a depth at the mangrove test section of 0.09 m (60% submergence of the roots).
Transient waves were generated with an error function with depth at wavemaker = 0.98 m and eight rows of mangroves on the test section fully emergent. Three trials were generated using error function scale factor (SF) 200, SF 300, and SF 400, with increasing SF resulting in increased representative time scale and decreased wave amplitude.
Event | Transient Waves Plus Currents - Eight Rows
Description:
Transient waves were generated with an error function in the presence of a steady current through the test section with eight rows of mangroves present. Water depth at the wavemaker was 1.09 m, resulting in a depth at the mangrove test section of 0.09 m (60% submergence of the roots). Three trials were generated using error function scale factor (SF) 200, SF 300, and SF 400, with increasing SF resulting in increased representative time scale and decreased wave amplitude.
