TY - JOUR
T1 - GRAVEL BEACH CROSS- AND ALONGSHORE RESPONSE TO AN EXTREME EVENT: BEACH LENGTH AND HEADLAND PROXIMITY CONTROLS
AU - McCARROLL, RJ
AU - MASSELINK, G
AU - WIGGINS, M
AU - SCOTT, TIM
AU - BILLSON, O
AU - CONLEY, D
PY - 2019/5
Y1 - 2019/5
N2 - Gravel beach morphologic change is a function of combined cross- and alongshore
transport. At present, numerical methods deal with these processes separately. We present
observations from Start Bay, UK, of extreme storm response and recovery, across five gravel subembayments (lengths 250 m to 5 km). An easterly storm sequence in Feb-Mar 2018 forced massive
alongshore transport (rotation and headland bypassing) and cross-shore transport including
erosion of the barrier, destruction of barrier-crest roads, and distribution of material offshore. We
demonstrate that profile response is a function of embayment length and headland proximity,
such that: (i) pocket embayments (~250 m) experience a uniform response; (ii) short embayments
(~500 m) rotate around a pivot point; (iii) longer bays (>1 km), exhibit a weak cut-fill response near
the mid-point; and (v) long beaches (>5 km) show a strong cross-shore response, with rotation
near the headlands. This study aids development of fully-coupled gravel transport models.
AB - Gravel beach morphologic change is a function of combined cross- and alongshore
transport. At present, numerical methods deal with these processes separately. We present
observations from Start Bay, UK, of extreme storm response and recovery, across five gravel subembayments (lengths 250 m to 5 km). An easterly storm sequence in Feb-Mar 2018 forced massive
alongshore transport (rotation and headland bypassing) and cross-shore transport including
erosion of the barrier, destruction of barrier-crest roads, and distribution of material offshore. We
demonstrate that profile response is a function of embayment length and headland proximity,
such that: (i) pocket embayments (~250 m) experience a uniform response; (ii) short embayments
(~500 m) rotate around a pivot point; (iii) longer bays (>1 km), exhibit a weak cut-fill response near
the mid-point; and (v) long beaches (>5 km) show a strong cross-shore response, with rotation
near the headlands. This study aids development of fully-coupled gravel transport models.
UR - https://pearl.plymouth.ac.uk/context/bms-research/article/2681/viewcontent/McCarroll_etal_CS19_OpenAccessVersion.pdf
U2 - 10.1142/9789811204487_0234
DO - 10.1142/9789811204487_0234
M3 - Conference proceedings published in a journal
VL - 0
JO - Coastal Sediments 2019
JF - Coastal Sediments 2019
IS - 0
T2 - International Conference on Coastal Sediments 2019
Y2 - 1 May 2019
ER -