TY - JOUR

T1 - Remote Sensing of Wave Overtopping on Dynamic Coastal Structures

AU - Blenkinsopp, Chris E.

AU - Baldock, Tom

AU - Bayle, Paul

AU - Foss, Ollie

AU - Almeida, Luis Pedro

AU - Schimmels, Stefan

N1 - Funding Information: Funding: DynaRev1 received funding from the European Union’s Horizon 2020 research and inno‐ vation programme under grant agreement No 654110, HYDRALAB+. DynaRev2 was funded through a Research England Global Challenges Research Fund. Chris Blenkinsopp was supported by a Royal Academy of Engineering Leverhulme Trust Research Fellowship. Ollie Foss and Paul Bayle were supported by a PhD scholarship through the EPSRC CDT in Water Informatics: Science and Engineering (WISE).

PY - 2022/1/21

Y1 - 2022/1/21

N2 - The development of coastal regions combined with rising sea levels is leading to an increasing risk of coastal flooding caused by wave overtopping of natural beaches and engineered coastal structures. Previous measurements of wave overtopping have been obtained for static coastal structures using fixed current meters and depth sensors or tanks. These are unsuitable for dynamically stable coastal protection structures however, because the geometry of these structures is expected to evolve under wave action. This study investigates the potential to use elevated 2D laser scanners (Lidar) to remotely sense the flow volumes overtopping the time-varying crest of a porous dynamic cobble berm revetment. Two different analysis methods were used to estimate the wave-by-wave overtopping volumes from measurements of the time-varying free surface elevation with good agreement. The results suggest that the commonly used EurOtop parameterisation can be used to estimate overtopping discharge to an acceptable precision. An advantage of the remote sensing approach reported here is that it enables the spatial distribution of overtopping discharge and infiltration rate to be measured. It was found that the overtopping discharge on a porous dynamic revetment decays rapidly landward of the structure crest, and that this has implications for safety and structure design.

AB - The development of coastal regions combined with rising sea levels is leading to an increasing risk of coastal flooding caused by wave overtopping of natural beaches and engineered coastal structures. Previous measurements of wave overtopping have been obtained for static coastal structures using fixed current meters and depth sensors or tanks. These are unsuitable for dynamically stable coastal protection structures however, because the geometry of these structures is expected to evolve under wave action. This study investigates the potential to use elevated 2D laser scanners (Lidar) to remotely sense the flow volumes overtopping the time-varying crest of a porous dynamic cobble berm revetment. Two different analysis methods were used to estimate the wave-by-wave overtopping volumes from measurements of the time-varying free surface elevation with good agreement. The results suggest that the commonly used EurOtop parameterisation can be used to estimate overtopping discharge to an acceptable precision. An advantage of the remote sensing approach reported here is that it enables the spatial distribution of overtopping discharge and infiltration rate to be measured. It was found that the overtopping discharge on a porous dynamic revetment decays rapidly landward of the structure crest, and that this has implications for safety and structure design.

KW - 2D laser scanners

KW - Coastal flooding

KW - Coastal protection

KW - Dynamic cobble berm revetment

KW - Lidar

KW - Overtopping

UR - http://www.scopus.com/inward/record.url?scp=85141762554&partnerID=8YFLogxK

U2 - 10.3390/rs14030513

DO - 10.3390/rs14030513

M3 - Article

VL - 14

JO - Remote sensing

JF - Remote sensing

SN - 2072-4292

IS - 3

M1 - 513

ER -