| The movement of beach sediments, leading to erosion and accretion, has been shown by many researchers to be fundamentally associated with nearshore wave field properties such as wave skewness. With recent advancements in velocity sensors, large collections of high quality velocity data are being gathered and examined throughout the world. SandyDuck '97, the source of the data used herein, is one such collaborative effort of experimenters. Faculty and students from Dalhousie University, the University of Manitoba and Memorial University of Newfoundland formed the Canadian part of this collaboration. Over two months of semi-continuous data were collected from five different locations in the nearshore. Two of these locations were equipped with Acoustic Doppler Velocimeter (ADV) sensors in addition to traditional Electromagnetic Current Meters (EMCM) and pressure sensors.; Using the ADV and EMCM from one of the two frames, a large dataset of concurrent and relatively collocated velocity records has been compiled. These data facilitate a detailed comparison of the instrumentation that addresses concerns over the accuracy of the EMCM's. The results indicate very good agreement between these records. Deviations between the measurements from the two instruments are discussed and can likely be explained simply by local variations, especially vertical variations in the wave field. (Abstract shortened by UMI.)... |
