Influence of controlled density arrays of natural and artificial vegetation on flow field characteristics
Master of Science (MS)
Geography and Anthropology
The purpose of this study is to determine the ideal planting density for trapping sediment as a means for determining the most economic and efficient means of foredune development. Research was conducted along the Texas Gulf Coast, within Padre Island National Seashore over a two week period. Four pegboards were aligned perpendicular to oncoming wind direction. Artificial and natural vegetation were plugged into the pegboard at incremental increases in 5% vegetation cover using volumetric measures of both plant types. Both natural and artificial vegetation reduce wind speed proportionately higher between 30% and 50% vegetation density. Natural vegetation has a higher momentum flux compared to the artificial vegetation, however; the rate of change between the two is proportional. This suggests the artificial vegetation may act as a more ideal proxy for natural vegetation rather than solid elements. The sediment flux rate for natural vegetation showed a 90% reduction at a planting density of 18%. This is likely to be the lower limit of vegetation planting for foredune development. The low result in required percent cover for vegetation is likely a function of the low wind speeds experienced throughout the study period and it is suggested that a higher planting density be utilized.
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Booth, Jennifer Lynn, "Influence of controlled density arrays of natural and artificial vegetation on flow field characteristics" (2006). LSU Master's Theses. 2502.