SWASH, MOISTURE, AND BEACH GROUNDWATER INTERACTIONS

Swash and beach groundwater influence the morphological evolution of beaches (Bakhtyar, 2011; Masselink, 2012) and impact maximum runup elevations (Delisle, 2023). Numerical modeling and laboratory experiments provide insight into the relationship between surface and subsurface swash zone processes. However, there are few simultaneous observations of these processes in the field. Here, surface (runup, rainfall, and beach profile) and subsurface (pore pressure and moisture content) measurements are used to investigate swash zone flow exchange dynamics for a range of conditions.