Beach slopes, sand movements, and sand composition have been studied by a number of organizations and individuals, but the interstitial water and the possible interrelations between beach characteristics and changing water levels within the beach seem to have received little attention....
Emery, K. O., and J. F. Foster. 1948. "Water tables in marine beaches." Journal of Marine Research 7, (3). https://elischolar.library.yale.edu/journal_of_marine_research/693