We recently deployed a GoPro Hero 3 camera and two RBR D|wave gages to study boat wakes and boat traffic at a site on West Fowl River (AL) over the Labor Day weekend. The GoPro is set to capture photos every 10 s using the time lapse mode. It is wired to an external battery using the LongShot battery elimination system. The wave gages were configured independently such that one is sampling continuously and the other is processing bursts of waves every five minutes. These two sampling schemes will allow us to study the boat wake signatures in great detail (continuous sampling) and also in summary form (wave bursts). The camera system should allow us to match boat wake signatures with the vessels that generated them. While not perfect, we may also be able to estimate boat size and speed from the time lapse photos.
Here is a time lapse video (~30 seconds) of the installation at our study site…
The Department of Civil Engineering at the University of South Alabama is seeking to fill a funded Graduate Research Assistantship for a student interested in pursuing a Master of Science in Civil Engineering degree, or a Doctor of Science in Systems Engineering, with concentrations in structural and/or coastal engineering. The initial appointment is for one year (1/2016 – 12/2016) and renewal will be contingent upon quarterly performance reviews (for up to three years ending 12/2018). The position will be competitively funded with a stipend and tuition. The qualified applicant should have an earned BS or MS degree in civil engineering by 12/31/2015, have an interest in coastal and/or structural engineering, and meet all admission standards of the Graduate School, and Department of Civil Engineering, at USA. Applicants should prepare the following materials and upload them to Academic Jobs using the link below: (1) brief statement of interest, (2) resume, (3) university transcripts, (4) a list of three references, (5) a technical writing sample, and (6) GRE and TOEFL/IELTS scores (if applicable).
Application Submission Link: https://academicjobsonline.org/ajo/jobs/5724 (click on the “Apply” link)
Position
The successful candidate will be appointed to a Graduate Research Assistant position at the University of South Alabama (USA) in the Department of Civil Engineering and will be expected to pursue a Master of Science in Civil Engineering (MSCE), or a Doctor of Science in Systems Engineering, in the specialty areas of coastal and/or structural engineering. The University of South Alabama is a public university in Mobile, Alabama and the campus is located 30 miles from the white-sand beaches of the Gulf of Mexico. The MSCE program at USA focuses on civil engineering in the coastal environment and department faculty research expertise includes the traditional areas of water resources, environmental, transportation, geotechnical and structural engineering as well as coastal engineering.
Research
The research responsibilities of the student will be to assist in a five-year funded research project focused on improving the resiliency of the built environment to disasters and natural hazards. The project requires original research, laboratory work, numerical analysis, and interpretation of results. The student will perform physical modeling of wave-structure interactions in our new 25-meter wave channel. Additional project details will be made available at an appropriate time. The ideal candidate will:
1) Have demonstrated knowledge of common numerical analysis software (e.g., Matlab)
2) Have demonstrated experience working in a laboratory
3) Have experience or the ability to learn 3D rendering software (e.g., SolidWorks)
4) Be familiar with 3D printing (rapid prototyping) and conventional fabrication techniques
5) Be physically capable of performing their duties in the laboratory facility
6) Be able to travel to meetings and conferences
7) Be legally able to attend school in the United States without sponsorship or travel assistance
Mobile, Alabama – The ability of communities to recover from natural and manmade disasters is strongly linked to the resilience of their infrastructure. That is why the U.S. Department of Commerce’s National Institute of Standards and Technology (NIST) announced yesterday that it has awarded a $20 million, five-year agreement with Colorado State University and 10 other partners, including the University of South Alabama, to establish the Community Resilience Center of Excellence. Click on the logo (top right of post) to link to the Center web site.
The goal of the Center is to develop a risk-based approach to evaluate potential strategies that improve the resilience of the built environment to natural hazards and other significant manmade disruptions.
The resilience tools that the Center develops will address known and frequent hazards, and gauge the ability of communities and the built environment to adapt to changing conditions and recover quickly from large-scale disasters.
The University of South Alabama’s Department of Civil Engineering will provide their unique coastal engineering expertise related to hurricane storm surge and waves. Drs. Bret Webb and Scott Douglass will help develop risk-based tools that address vulnerability and resilience of the built environment to coastal hazards like storm surge, waves, erosion and even sea level rise. Webb and Douglass recently authored nationwide engineering guidance for assessing the exposure and vulnerability of coastal transportation infrastructure to extreme events.
“With well over 50% of the U.S. population living within 50 miles of a coastline,” says Dr. Webb, who is an Associate Professor of Civil Engineering, “much of our nation’s critical infrastructure is vulnerable to coastal hazards and the expected impacts of long-term sea level rise.”
“What’s more troubling,” Dr. Webb continues, “is that demand in these coastal areas is increasing, putting more stress on our built environment and underscoring the need for improving the resiliency of our coastal communities.”
Dr. Scott Douglass, Professor of Civil Engineering, added, “Based on both experience and study, we understand that the built environment along our nation’s shorelines is highly vulnerable today, and will face increased pressures due to the expected impacts of climate change in the future.”
“However, the good news,” Dr. Douglass continued, “is that making our coastal infrastructure more resilient to frequent storm events today will also reduce their vulnerability in the future.”
With authorization from NIST to begin their efforts immediately, the multi-disciplinary research team, which also includes experts from California Polytechnic University (Pomona), Rice University, Texas A&M University (TAMU), TAMU-Kingsville, and the University of Washington, is expected to hold their first organizational meeting soon.
Our new wave-current channel is finally operational! We completed training and final commissioning of the facility early last week with a representative of HR Wallingford. Now we are just waiting for the surrounding renovations to be completed. Most mechanical work was completed last week and now they are fitting insulation and hanging drywall. The “flume room” and surrounding space should be finished out by the end of April. Until then, we are living in a construction area.
The channel’s capabilities are quite impressive. While it will likely take months to learn the nuances of our system, it is clearly capable of producing very clean waves. The paddle’s active absorption system is really amazing and helps damp the reflected wave.
I have been somewhat hesitant to test the limits of the paddle, but that will surely change in the near future. The advisable limit for paddle acceleration is about 0.5G’s (4.9 m/s/s) and I think I have only tested up to about one-half of that suggested value.
So far I have experimented with the spectral, regular, and solitary-type waves. I was even able to generate a fairly steep wave that broke (spilling) off the paddle. The video below shows a low-amplitude (<10 cm), 2-s-period wave. Click on the triangle to play the video.
More updates coming soon, as well as an exciting announcement that may give you the opportunity to come visit ‘South and see our new facility first-hand!
Our installer from Armfield has made great progress in only nine days since unpacking on the 20th. Paul had a special helper this week, the flume’s designer Chris. These two gentlemen worked diligently and were able to complete assembly of the flume and glass, installation of the recirculation system and wavemaker, and preparation of the electrical control pedestals. After some additional plumbing we should be ready to put water in it next week.
Check back soon for additional updates. The area looks very much like a construction site right now, but I hope to have better pictures when everything gets cleaned up and organized in the coming weeks.
