AN AUTONOMOUS SAMPLER FOR IN-SITU VERTICAL BENTHIC BIOGEOCHEMICAL FLUXES DETECTION

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dc.contributor.advisorBriggs, Ellen
dc.contributor.authorLamoonkit, Jomphol
dc.contributor.departmentOcean & Resources Engineering
dc.date.accessioned2024-07-02T23:41:43Z
dc.date.available2024-07-02T23:41:43Z
dc.date.issued2024
dc.description.degreeM.S.
dc.identifier.urihttps://hdl.handle.net/10125/108336
dc.subjectOcean engineering
dc.subjectbiogeochemical fluxes
dc.subjectIn-situ benthic sampler
dc.subjectsediment pore water
dc.titleAN AUTONOMOUS SAMPLER FOR IN-SITU VERTICAL BENTHIC BIOGEOCHEMICAL FLUXES DETECTION
dc.typeThesis
dcterms.abstractBenthic environments in the coastal ocean, such as seagrass meadows, have gained attention for their capacity to store organic carbon in their systems such as the organic tissue of seagrass. Nevertheless, there is still room to study their influence on vertical biogeochemical fluxes between pore water beneath the sediment layer and the overlying seawater. The ability to monitor the vertical biogeochemical fluxes of seawater in the vegetated sedimentary environment could improve our understanding of the role of the vegetated benthic environment on the carbon cycle. Moreover, accurate and rapid measurement of benthic vertical biogeochemical fluxes could also contribute to the monitoring efforts for marine-based Carbon Dioxide Removal (mCDR) research in order to verify the subtle changes of seawater chemistry in the benthic regions.This study aims to contribute to the biogeochemical monitoring efforts through an in-situ sampler system called the Benthic Alternating Autonomous Sampler (BAAS). The instrument is designed to be deployed on the seabed and to alternately sample between the sediment pore water and overlying water. The system is autonomously controlled by a microcontroller (Arduino). The design integrates Rhizon screen sections that allow retrieval of water samples from various sediment grain sizes (≥ 0.15 μm). In this study, optical pH and oxygen sensors, and temperature probes were integrated with the BAAS system as one such example and to demonstrate proof of concept. The BAAS system is intentionally designed to be able to interface with numerous different flow-through sensors. A benchtop system is demonstrated in this study to explore the flow rate under different sediment types, carryover volume, alternation properties, and sensor readings, which would provide the critical basis for in-situ sensor development. This prototype, bench version of the in-situ sampler apparatus would enable us to study the effect of sediment types and sampling depth on the performance of the sampler. Furthermore, the open-source platform would facilitate other researchers' ability to replicate the system easily. This sampler system would also open up possibilities for studying benthic sedimentary fluxes, providing insights into ocean ecosystems and seawater chemistry.
dcterms.extent72 pages
dcterms.languageen
dcterms.publisherUniversity of Hawai'i at Manoa
dcterms.rightsAll UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
dcterms.typeText
local.identifier.alturihttp://dissertations.umi.com/hawii:12149

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M.S. - Ocean and Resources Engineering