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Effects of Native Plants and Low Impact Management on Beach Erosion in Mississippi

Effects of Native Plants and Low Impact Management on Beach Erosion in Mississippi.

MikeCarlo
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Effects of Native Plants and Low Impact Management on Beach Erosion in Mississippi

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    1. Effects of Native Plants and Low Impact Management on Beach Erosion in Mississippi

    21. Beach erosion has occurred continuously since then, requiring 3 renourishment projects. • 1973 - 1.45 million cubic meters ($1.8 M) • 1985 - 0.76 million cubic meters ($2.8 M) • 2001 - 0.84 million cubic meters ($5.9 M)

    22. Erosion takes 3 forms:

    23. Erosion on the man made beach takes three forms:

    24. Windblown sand is a continued nuisance on Rt 90.

    25. Erosion takes 3 forms:

    26. Erosion takes 3 forms:

    27. Project site: Three acres in Biloxi

    28. When we started, the site was just another part of the conventionally managed beach

    29. In fact, it was a topographical low point along that section of the beach. How did we know?

    30. Over time (and through many storms) site elevation actually increased.

    31. Mechanisms of Site Elevation Increase? Plant roots “anchored” sand. Plant stems tended to dissipate wave and wind energy and capture additional sand. Other mechanisms?

    32. Quantifying the effects of natural plantings and management. Results will be summarized here. Results are described in greater detail in Implementation of Landscape Management and Native Plantings for the Man-Made Beach in Biloxi, MS (available at the Center for Sustainable Design website, http://www.abe.msstate.edu/csd/index.html )

    33. Beach Elevation Profiles, May ‘02

    35. Profile cross sectional areas (based on common reference elevation) are nearly identical despite absence of renourishment on experimental site.

    38. The experimental and control sites showed compaction differences Compaction influences the rate that water is absorbed in the sediment. Highly compacted material tends to keep water near the surface, leading to erosion.

    41. The experimental and control sites showed differences in infiltration rate. The greater the infiltration rate, the lower the surface runoff rate. Double ring infiltrometer measurements were taken along 3 transects at each site.

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