Temporal and spatial behaviour of rip channels in a multiple-barred coastal system

Autor: S. Quartel
Rok vydání: 2009
Předmět:
Zdroj: Earth Surface Processes and Landforms. 34:163-176
ISSN: 1096-9837
0197-9337
DOI: 10.1002/esp.1685
Popis: A 15-month data set of daily time-averaged video images (Argus) has been analyzed to describe the spatial and temporal variability of the rip channels on a multiple-barred coast at Noordwijk aan Zee, The Netherlands. The landward boundary of the intertidal bars and a proxy of the subtidal bar crest, defined as the intertidal and subtidal bar lines respectively, were derived from the Argus images. Local seaward-directed deviations of the bar lines represent the cross-shore and alongshore locations of the rip channels. The average intertidal rip spacing () was 243 m, but the rips were not spaced regularly (σλ/= 0.47). Some intertidal rips were observed to fill up during falling tide, but the majority remained open. The filled intertidal rip channels had more landward positions and migrated more slowly (2.4 versus 4.6 m/day) in the alongshore direction than the open intertidal rip channels. The number and the alongshore migration rate of open intertidal rip channels increased with the preceding wave heights (r = 0.26, p
Databáze: OpenAIRE
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