Coastal Engineering Laboratory and Field Measurements: Some Uncertainties in Measurement

by Frederic Raichlen,

Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water


In this paper two examples of uncertainties which can occur in field measurements and measurements in coastal engineering models are examined. These examples are chosen to demonstrate how measurements frequently made of waves both in nature and in the laboratory may be in error unless attention is given to the basic fluid mechanics of the problem. The first deals with the measurement of the water-surface time history near the shoreline using bottom sited pressure transducers. The errors which can occur unless the proper algorithms are used are discussed. The second example is a wave measurement problem which occurs relatively often in laboratory models of harbors. This relates to the Interpretation of the laboratory results for long waves from periodic and spectral wave testing when there is wave reflection in the model.

Subject Headings: Coastal engineering | Uncertainty principles | Wave measurement | Long waves | Wave reflection | Wave spectrum | Water surface | Laboratory tests

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