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An experimental study to validate the exponential attenuation of wave height is presented. Coastal vegetation can often attenuate the wave height as well as the wave energy and are, therefore, of interest. The tests were carried out with submerged artificial sea grass vegetation meadow of 2 m length in a wave flume 50 m long, 0.74 m wide and 1.1 m deep. The model plants were prepared from 0.0001 m thick polyethylene plastic sheets with 0.01 m high stipes and 0.21 m long leaves. Regular waves were generated and the wave heights within the vegetation zone measured. For a water depth of 0.40 m, and wave periods 1.8 sec and 2 sec, five different wave heights ranging from 0.08 m to 0.16 m at an interval of 0.02 m were generated. Measurements of wave heights at different locations along the vegetation meadow indicate that as the wave propagates through the sea grass, there is an exponential decay in wave height.

Natural processes like wave action, tides, winds, storm surges, and tsunamis constantly shape the shoreline by inducing erosion and accretion. Coastlines with intact vegetated dunes, mangroves, and reefs act as a buffer zone against wave attack on beaches. This article discusses the effect of simulated seagrass on wave height attenuation and wave run-up through an experimental study. The tests were carried out with submerged artificial seagrass subjected to varying wave climate in a 50-m-long wave flume. Measurements of wave heights along the seagrass meadow and the wave run-up on a 1:12 sloped beach were taken for wave heights ranging from 0.08 to 0.16 m at an interval of 0.02 m and wave periods 1.8 and 2 seconds in water depths of 0.40 and 0.45 m.

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