Forging a Geosciences Career Pathway: My Journey with Multibeam Sonar
When I began my internship at the United States Geological Survey St. Petersburg Coastal and Marine Science Center (SPMSC), I was filled with excitement and determination. My goal was simple: to expand my skills as a scientist and make the most of this unique opportunity. Little did I know that this journey, driven by curiosity, would redirect my academic and professional goals within the geosciences field.
From the outset, I was tasked with developing a project and creating a poster in just two months. My project focused on multibeam sonar, a complex technology that maps the ocean floor and underwater features using sound waves and a system of sensors.
As a novice in seafloor mapping, I felt both exhilarated and intimidated. The data processing software, CARIS HIPS and SIPS, was complex and unfamiliar. The abundance of technical jargon and the abstract nature of the concepts often left me feeling overwhelmed. I could have easily pivoted to a simpler project within my comfort zone. Instead, I chose to embrace the challenge, driven by my curiosity to understand the functionality of the multibeam sonar.
Embracing Roadblocks
I started investigating discrepancies in Patch Test surveys—multibeam sonar surveys conducted in areas of known bathymetry that collect the necessary data to perform calibrations to the acquisition system. For my project, I processed data from three different patch test surveys taken at the same location over three years, gradually gaining insight into the complexities of the software and the underlying principles of the technology. After cleaning the data, I began to analyze discrepancies between the bathymetry data sets by creating difference surfaces and comparing profiles. With each question I answered, my curiosity only deepened.
However, I soon hit a significant roadblock. After analyzing the data, I discovered that the uncertainty threshold for one of the datasets was too large to continue. This was due to an acquisition error that couldn’t be ignored or remedied—it was a matter of scientific integrity.
This was a disappointing discovery and it could have marked the end of my project, but I chose to seek out new learning opportunities. I realized that while the bathymetry data was compromised, the backscatter data remained intact. Backscatter refers to the intensity of reflection of sound waves off the seafloor, offering insights into the characteristics of underwater surfaces. For example, harder surfaces such as rock tend to have higher reflectivity while softer sediments such as muds tend to be more diffuse. My interest was sparked, and I wanted to learn more.
From Novice to Field Contributor
With determination, I began to analyze the discrepancies in backscatter data across the different surveys. This required significant self-directed research since this seafloor mapping team doesn’t extensively utilize backscatter data. Drawing on my knowledge from a remote sensing course, I used ArcGIS Pro to generate rasters from the backscatter mosaics and classified them. My goal was to highlight changes in sediment coverage at the patch test site over the years.
The process required several hours of experimentation, but I enjoyed the challenge. As I navigated through different classification schemes, my understanding of backscatter deepened. I realized that this new direction not only enhanced my project but also ignited a passion for further research in grad school.
By the end of the summer, I had transformed from a novice into a contributor in the field. I was proud of my journey—how I let my curiosity drive me, turned obstacles into opportunities, and committed to exploring the complexities of multibeam sonar. This experience taught me that the best discoveries often lie just beyond the roadblocks we face. By asking questions and embracing challenges, I expanded my horizons and forged a path toward becoming a better scientist. I look forward to continuing this journey of exploration and learning in the future.
Engaging with Fellow Researchers at Conferences
In September, I attended the 2024 Geological Society of America Conference to present research I conducted at Eckerd College on the impact of the Deepwater Horizon Oil Spill on Gulf of Mexico Sediments. Although this research is not directly related to hydrography, my experience with multibeam sonar enriched my perspective and allowed me to better understand the applications of remote sensing in others’ presentations.
During the conference, I engaged in meaningful conversations with fellow researchers and professionals, sharing insights and exchanging ideas about seafloor mapping and its implications for environmental monitoring and natural resource management. I was particularly inspired by how various technologies, including remote sensing, can be leveraged to address pressing environmental issues. I left the conference motivated to explore these connections further and eager to incorporate new perspectives into my future research endeavors.
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