Abstract
The increasing urbanization of coastal regions makes beach erosion and coastline protection an important field of research (Elko et al., 2014). Excess pore pressures and pore pressure gradients in the soil matrix can impact sediment mobilization and erosion in terms of liquefaction (Sumer, 2014). Despite previous studies, there are still unsolved questions regarding coastal liquefaction due to wave action. Particularly, the role of groundwater dynamics, the impact of wave breaking, sediment reorganization, and potential air content represent unsolved problems. Furthermore, open questions still exist regarding the interaction and roles of excess pore pressure built-up, vertical pressure gradients and horizontal pressure gradients (Foster et al., 2006; Yeh and Mason, 2014; Sumer, 2014; Stark, 2017). We hypothesize that temperature variations may reveal complementary information with regard to pore water fluid behavior, such as pore space saturation, groundwater flows, exfiltration and infiltration processes, and impact of wave forcing. The study presented here shows some preliminary data sets of combined pore pressure and temperature recordings.
Highlights
For this preliminary study, pressure and temperature variations were analyzed for three chosen tidal cycles during storm and pre-storm conditions, respectively
During tidal cycle 16 and more energetic wave conditions, temperature profiles throughout the tidal cycle exhibited a similar trend at the measured sediment depths
Temperature variations appeared to be associated with four processes: infiltration of water into the beachface, wave forcing, groundwater flow, and air ventilation
Summary
METHODOLOGY Pore pressure and temperature variations were measured with regard to local hydrodynamic forcing and possible sediment transport. A vertical array of pressure and temperature sensors was deployed in the central intertidal zone of a steep (7° slope), mixed-sand-gravel, mega-tidal beach in Advocate, Nova Scotia, Canada. Three sensors were buried at sediment depths of 5 cm, 20 cm, and 60 cm.
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