Title

Effect of groundwater on beach erosion

Document Type

Conference Proceeding

Date of Original Version

12-1-1989

Abstract

There is substantial hydraulic head established in the beach zone which creates a relatively steep groundwater gradient. Flow net analysis shows the outflow to be focused somewhat below mean water level at any period of time, with the highest flux occuring near low tide stands. Measurements taken on Rhode Island barrier beaches indicate that the combination of tide and wind action mounds the water in the upper beach as much as 0.8 meter above mean sea level. As the groundwater moves outward through the active beach face energy is transfered to the sand grains as an uplift force resulting in reduced intergranular strength and increased susceptibility to the erosive force of backwash water and wave induced turbulence. Calculations indicate that reversal of the groundwater gradient by pumping has considerable potential for beach erosion control.

Publication Title

Coastal Zone: Proceedings of the Symposium on Coastal and Ocean Management

Volume

5

Issue

pt5

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