Measuring run-up on a natural beach |
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| Authors: | RA Holman RT Guza |
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| Institution: | 1. School of Oceanography, Oregon State University, Corvallis, OR 97331 U.S.A.;2. Shore Processes Laboratory, Scripps Institution of Oceanography, La Jolla, CA, 92093 U.S.A. |
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| Abstract: | Field experiments have been performed to evaluate and intercompare two techniques for measuring run-up on natural beaches, resistance wires and films. Simultaneous deployment of wire sensors shows a low error (< 5%) in electronics gain, but a strong sensitivity to the elevation of the wires above the beach face. On a low slope (β ～ 0.02) beach, with incident wind waves of moderate height (H ～ 1 m), differences of only a few cm in the wire elevation cause variance differences as large as 25%, in otherwise identical sensors. Replicate digitizations of the same run-up film show variance differences as large as 20%, with an average deviation from the mean variance of 8%.Use of the film and resistance wire sensors on the same run-up field showed small differences in the mean swash elevation (i.e., set-up), but an 83% difference in swash variance. Much further work is needed to determine the dependence of sensor differences on beach slope, porosity, camera elevation and other factors. |
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