Investigation of the Water Table in a Tidal Beach.
Technical rept. 1 Jul 69-30 Sep 71,
VIRGINIA INST OF MARINE SCIENCE GLOUCESTER POINT
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Fluctuations in the beach water table at Virginia Beach, Virginia, were studied to better understand the causes and consequences of the oscillations. Special instrumentation for monitoring the water-table surface was designed and is described in the report. The major environmental variables responsible for the fluctuations were evaluated by multiregression analysis in which the dependent variable was the rise of the water table in a well over a half-tidal cycle and the independent variables were atmospheric pressure, the rise in the ocean still-water-level SWL, the distance of the well from the foreshore, and a measure of the contribution of the uprush to the water table. One and two-dimensional finite-element models were constructed to model the groundwater flow. Descriptions of and listings for the FORTRAN computer programs are given. Changes in foreshore sand volume, as a result of fluctuations in the water table, changes in head gradient, and oscillations in the oceanic SWL were also studied. Predictor equations for changes in quantity of foreshore sand over intervals of one-half and entire tidal cycles are developed. Author
- Hydrology, Limnology and Potamology