A comparison of tilt current meters and an acoustic doppler current meter in vineyard sound, Massachusetts

Lowell, N. S.; Walsh, David R.; Pohlman, John W.

doi:10.1109/cwtm.2015.7098135

Cited by 12 publications

(7 citation statements)

References 6 publications

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“…Measured flow velocity in the SG was, on average, 0.4 ± 0.1 cm/s during the yearlong deployment. These flow velocity values are below the reported detection limit of the tilt-current meter (Lowell et al, 2015), but are consistent with a previous study that suggested inland-flowing groundwater in conduits within the SG can explain temperature anomalies in the water column (Beddows et al, 2007).…”

Section: Hydrologic Recordssupporting

confidence: 91%

“…Within the cave, groundwater flow velocity, water level, and water temperature were monitored at 17‐m water depth in the BW and at 22‐m water depth in the SG. Velocity was measured as current speed and direction with a TCM‐1 (Lowell Instruments, LLC) tilt current meter (TCM; ± 2 cm/s + 3% of reading accuracy and 0.1‐cm/s resolution; bearing ±5° accuracy for speed >5 cm/s − with a 0.1° resolution) at 1‐min intervals (Lowell et al, ). Water level measured with an Onset U20 logger (± 0.21 cm with an error less than ±1.0 cm at 15‐min intervals) is reported as the departure from the mean value after compensating for barometric pressure changes measured at the meteorological station.…”

Section: Methodsmentioning

confidence: 99%

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Hydrologic Controls of Methane Dynamics in Karst Subterranean Estuaries

Brankovits

Pohlman

Ganju

et al. 2018

Global Biogeochemical Cycles

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Karst subterranean estuaries (KSEs) extend into carbonate platforms along 12% of all coastlines. A recent study has shown that microbial methane (CH4) consumption is an important component of the carbon cycle and food web dynamics within flooded caves that permeate KSEs. In this study, we obtained high‐resolution (~2.5‐day) temporal records of dissolved methane concentrations and its stable isotopic content (δ13C) to evaluate how regional meteorology and hydrology control methane dynamics in KSEs. Our records show that less methane was present in the anoxic fresh water during the wet season (4,361 ± 89 nM) than during the dry season (5,949 ± 132 nM), suggesting that the wet season hydrologic regime enhances mixing of methane and other constituents into the underlying brackish water. The δ13C of the methane (−38.1 ± 1.7‰) in the brackish water was consistently more 13C‐enriched than fresh water methane (−65.4 ± 0.4‰), implying persistent methane oxidation in the cave. Using a hydrologically based mass balance model, we calculate that methane consumption in the KSE was 21–28 mg CH4·m−2·year−1 during the 6‐month dry period, which equates to ~1.4 t of methane consumed within the 102‐ to 138‐km2 catchment basin for the cave. Unless wet season methane consumption is much greater, the magnitude of methane oxidized within KSEs is not likely to affect the global methane budget. However, our estimates constrain the contribution of a critical resource for this widely distributed subterranean ecosystem.

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Section: Hydrologic Recordssupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Hydrologic Controls of Methane Dynamics in Karst Subterranean Estuaries

Brankovits

Pohlman

Ganju

et al. 2018

Global Biogeochemical Cycles

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“…Simple pendulums can be used to infer velocity by measuring the tilt angle of a body suspended in a flowing liquid [ 49 ] and several research groups have developed open water instruments for coastal deployments based on the principle. Examples include the commercially available Lowell TCM-1 [ 50 ], a buoyant tethered sphere [ 51 ], the URSKI float design [ 52 ] and a load-cell based variation [ 12 ].…”

Section: Case Study 2—tracking Water Flow In a Flooded Cave Systemmentioning

confidence: 99%

Cave Pearl Data Logger: A Flexible Arduino-Based Logging Platform for Long-Term Monitoring in Harsh Environments

Beddows

Mallon

2018

Sensors

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A low-cost data logging platform is presented that provides long-term operation in remote or submerged environments. Three premade “breakout boards” from the open-source Arduino ecosystem are assembled into the core of the data logger. Power optimization techniques are presented which extend the operational life of this module-based design to >1 year on three alkaline AA batteries. Robust underwater housings are constructed for these loggers using PVC fittings. Both the logging platform and the enclosures, are easy to build and modify without specialized tools or a significant background in electronics. This combination turns the Cave Pearl data logger into a generalized prototyping system and this design flexibility is demonstrated with two field studies recording drip rates in a cave and water flow in a flooded cave system. This paper describes a complete DIY solution, suitable for a wide range of challenging deployment conditions.

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“…For these reasons, it is uncertain how the water levels measured in 2019 relate to elevations and floodplain geometry in the 2017 lidar data set described in Section 2.2 and used for the modeling in this study. Additionally, the tilt current meters are typically used for deeper‐water applications and have a minimum required depth for accurate results (Lowell et al., 2015). The study of water in floodplains, particularly in the absence of total inundation, involves relatively shallow environments.…”

Section: Tropical Storm Imeldamentioning

confidence: 99%

Bidirectional River‐Floodplain Connectivity During Combined Pluvial‐Fluvial Events

Tull

Passalacqua

Hassenruck‐Gudipati

et al. 2022

Water Resources Research

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Hydrologic connectivity controls the lateral exchange of water, solids, and solutes between rivers and floodplains, and is critical to ecosystem function, water treatment, flood attenuation, and geomorphic processes. This connectivity has been well‐studied, typically through the lens of fluvial flooding. In regions prone to heavy rainfall, the timing and magnitude of lateral exchange may be altered by pluvial flooding on the floodplain. We collected measurements of flow depth and velocity in the Trinity River floodplain in coastal Texas (USA) during Tropical Storm Imelda (2019), which produced up to 75 cm of rainfall locally. We developed a two‐dimensional hydrodynamic model at high resolution for a section of the Trinity River floodplain inspired by the compound flooding of Imelda. We then employed Lagrangian particle routing to quantify how residence times and particle velocities changed as flooding shifted from rainfall‐driven to river‐driven. Results show that heavy rainfall initiated lateral exchange before river discharge reached flood levels. The presence of rainwater also reduced floodplain storage, causing river water to be confined to a narrow corridor on the floodplain, while rainwater residence times were increased from the effect of high river flow. Finally, we analyzed the role of floodplain channels in facilitating surface‐water connectivity by varying model resolution in the floodplain. While the resolution of floodplain channels was important locally, it did not affect as much the overall floodplain behavior. This study demonstrates the complexity of floodplain hydrodynamics under conditions of heavy rainfall, with implications for sediment deposition and nutrient removal during floods.

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A comparison of tilt current meters and an acoustic doppler current meter in vineyard sound, Massachusetts

Cited by 12 publications

References 6 publications

Hydrologic Controls of Methane Dynamics in Karst Subterranean Estuaries

Hydrologic Controls of Methane Dynamics in Karst Subterranean Estuaries

Cave Pearl Data Logger: A Flexible Arduino-Based Logging Platform for Long-Term Monitoring in Harsh Environments

Bidirectional River‐Floodplain Connectivity During Combined Pluvial‐Fluvial Events

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