Fig. 5 shows an example 4-minute segment from tide 9 indicating the ability of both approaches for identifying the bed level. The water depth (Fig. 5A) during this infragravity segment varies from nearly dry to over 0.4 m with more than 15 individual waves. The corresponding cross-shore velocities during this time
papain (Fig. 5B; black) indicate onshore- and offshore-directed velocity magnitudes exceeding 1 m s− 1 associated with the arrival of an inner surf zone bore or long duration offshore-directed flow. Alongshore velocities during this time period (Fig. 5B; gray) are less variable with a maximum velocity magnitude of 0.6 m s− 1. The white curve in Fig. 5C is the bed level from the CCP data determined using the aforementioned criteria. The vertical axis is relative to the initial bed level identified from the CCP at the beginning of this tide. The bed varies over 0.015 m during this 4-minute span with a general erosional trend. There are short temporal gaps in the bed level time series when the identification criteria were not met. Fig. 5D shows the amplitude returns from the PV with the corresponding bed level as the white curve using the aforementioned criteria. The erosional trend seen is similar to that of the bed level identified from the CCP but with higher frequency variability and of generally less magnitude. The large gaps in the record are due to
sensor emergence.
