Abstract
Intertidal bars are naturally occurring morphological features along the waterline of sandy beaches. Present quantitative knowledge on intertidal bar behavior is limited, due to the scarcity of data resources and the limitations of traditional survey techniques. To investigate and quantify the cross-shore morphologic behavior of intertidal bars, hourly terrestrial laser scans of Kijkduin beach (The Netherlands) are used and a conceptual evolution intertidal bar model is constructed. In a six-week period in January and February 2017, a pronounced intertidal bar formed at Kijkduin beach and migrated onshore during mild wave conditions and eroded again during storm conditions. The observed maximum shoreward migration was 30 m horizontally with a maximum growth of about 1 m in the vertical direction. Onshore sediment transport fluxes peaked around 2 m3 per m width per day. In the conceptual model proposed here, run-up and overwash processes are dominant for shoreward growth and migration of the bar and submersion processes are responsible for bar destruction.
Highlights
Seasonal intertidal sandbars are frequently occurring features on sandy beaches with a significant micro- and meso-tidal range [1] that often develop during mild wave conditions
We present a six-week laser scan analysis of the complete development a2n.dFdieelsdtrSuictetioKnijckydculeinof an intertidal bar on a meso-tidal beach at Kijkduin beach, in the Netherlands
A total of 82 low tide terrestrial laser scans were used to monitor the development of the intertidal bar
Summary
Seasonal intertidal sandbars are frequently occurring features on sandy beaches with a significant micro- and meso-tidal range [1] that often develop during mild wave conditions. They often occur when the coast is recovering [2,3] after the winter season transporting sand towards the coast (Figure 1) and creating a summer profile with a wider beach and steeper slope. Storms often erode the beach-dune system [4] and a so-called winter profile is created with a relatively gentle slope and narrow beach.
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