Monitoring of Foredunes on Padre Island, Texas.
TEXAS TECH UNIV LUBBOCK DEPT OF RANGE AND WILDLIFE MANAGEMENT
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This study was conducted to continue monitoring foredunes formed from grass plantings made during 1969 to 1973 on north Padre Island beaches. The report summarizes data obtained from elevational profiles and vegetative transects at four experimental foredune sections and one natural foredune section during 1975 and 1976. The beach and foredunes, a 655-foot cross section, gained 5.7 cubic yards per linear foot of beach from August 1975 to August 1976. However, sand accumulation was not uniform the north end of the study area gained no sand. Plantings, 50 feet wide seaward of existing foredunes proved to be an effective dune-widening technique. This has provided a 125-foot dune base versus an 80-foot dune base from initial 100-foot-wide plantings. Sand-trapping rates averaged 6.3 cubic yards per linear foot per year on foredunes of experimental plantings versus 4.0 cubic yards for the unplanted, natural area. However, accumulation rates for the last year for planted and natural foredunes were almost identical. Apparently, the natural area is sufficiently vegetated to accumulate sand as rapidly as planted areas, but it has taken 15 years to reach this trapping efficiency and without a recognizable dune line. Rate of lateral grass spread from initial plantings varied from 5.25 to 7.24 ftyr.
- Soil Mechanics
- Civil Engineering