Spatial and Temporal Variations in Geometric and Material Properties of a Natural Beach.
NORTHWESTERN UNIV EVANSTON ILL DEPT OF GEOLOGICAL SCIENCES
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Contour maps of beach foreshore properties, such as mean grain size and beach slope, give spatial continuity to beach observations, and repetitive sampling endows the areal patterns with continuity in time. Rapid measurement methods and data reduction by portable computer terminal yield nearly real-time data for analyzing beach phenomena in theoretical and applied geological and coastal engineering studies while the field party is on the site. Maps were made at intervals over a 3-year period on the same stretch of beach located upcoast from Point Mugu, California. These maps included open unimpeded segments and segments immediately upbeach and downbeach of an impermeable steel sheet piling groin built for experimental purposes by CERC. A rectangular foreshore grid, 100 by 125 feet on edge, with rows parallel to the waterline was used as a convenient mapping cell. Aggregate properties of the beach, such as bulk density, shear resistance, water content, and conventional textural and geometric attributes, were mapped from samples collected at the grid points. Modified author abstract
- Physical and Dynamic Oceanography
- Civil Engineering