A case study on dune response to infragravity waves

2nd International Conference on Materials Science, Energy Technology and Environmental Engineering

材料科学;能源学;生态环境科学

Li, Wenshan^1,2 ; Wang, Hui^1 ; Li, Huan^1 ; Wu, Shuangquan^1 ; Li, Cheng^1

National Marine Data and Information Service, Tianjin, China^1

Key Laboratory of Marine Environmental Information Techonlogy, SOA, Tianjin

300171, China^2

关键词: Different slopes;    Dune erosion;    Infra-gravity waves;    Infragravity;    Process-based modeling;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/81/1/012053/pdf
DOI  :  10.1088/1755-1315/81/1/012053

来源: IOP

【 摘 要 】

A series of numerical simulations were conducted using the process-based model XBeach to investigate dune response under normal and getting rid of infragravity wave conditions with different slopes. Erosion volume upside the dune toe and dune top recession are set as indicators for dune vulnerability as well as defence capacity for its front-beach. Results show that both dune erosion volume and dune top recession decrease with gentler dune slopes. Of all the simulation cases, dune with a face slope of 1/1 lost most sand and supplied most sand for lower-bed. The presence of infragravity waves is validated to be crucial to dune vulnerability. The dune erosion volume is shown to decrease by 44.5%∼61.5% and the dune top recession decreased by 0%∼45.5% correspondingly, in the case that infragravity motion is not taken into account during simulation for different dune slopes.