Academic Journal
Coarse Sand Transport Processes in the Ripple Vortex Regime Under Asymmetric Nearshore Waves
| العنوان: | Coarse Sand Transport Processes in the Ripple Vortex Regime Under Asymmetric Nearshore Waves |
|---|---|
| المؤلفون: | Fritsch, N, Fromant, Guillaume, Hurther, David, Cáceres, Iván |
| المساهمون: | Geo-Ocean (GEO-OCEAN), Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Informatique Signal et Image de la Côte d'Opale (LISIC), Université du Littoral Côte d'Opale (ULCO), Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI), Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (Fédération OSUG)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP), Université Grenoble Alpes (UGA), Universitat Politècnica de Catalunya = Université polytechnique de Catalogne Barcelona (UPC) |
| المصدر: | ISSN: 2169-9275. |
| بيانات النشر: | CCSD Wiley-Blackwell |
| سنة النشر: | 2024 |
| المجموعة: | Université de Bretagne Occidentale: HAL |
| مصطلحات موضوعية: | [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] |
| الوصف: | International audience ; Large-scale wave flume experiments are conducted in the ripple vortex regime to study near bed coarse sand transport processes below asymmetric surface waves typical of the coastal nearshore region. For this purpose, a set of complementary acoustic instruments were deployed under regular nearshore wave conditions. Time-resolved velocity, sand concentration and sand flux profiles are measured across both the dense bedload and dilute suspension layers with an Acoustic Concentration and Velocity Profiler. The equilibrium 2D suborbital ripples are in good agreement in terms of dimensions, shape and onshore migration rate with Wang and Yuan (2018, https://doi.org/10.1029/2018jc013810, 2020, https://doi.org/10.1016/j.coastaleng.2019.103583). Stoss ripple vortex entrainment around the trough-to-crest flow reversal (FR+) is found to be more energetic in terms of sand pick-up into suspension compared to the counter rotating lee side vortex around the FR- flow reversal, as a consequence of the onshore skewed wave acceleration. Ripple vortex driven nearbed velocity phase leads around both flow reversals exceed typical bed friction induced values found in turbulent Wave Boundary Layers. Intrawave sand erosion events can be distinguished locally at the two ripple vortex positions around the flow reversals and two events more uniformly distributed along the ripple profile at wave crest and trough. Spatial fields of sand flux reveal the origin of the net onshore directed suspended and bedload transport. Good agreement is found with the mechanism identified under asymmetric oscillatory flows in Wang and Yuan (2020, https://doi.org/10.1016/j.coastaleng.2019.103583). Differences with ripple vortex regime under skewed shoaling waves and symmetric oscillatory flows are highlighted |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1029/2023jc020189 |
| الاتاحة: | https://hal.science/hal-04646273 https://hal.science/hal-04646273v1/document https://hal.science/hal-04646273v1/file/FritschEtal2024_JGR.pdf https://doi.org/10.1029/2023jc020189 |
| Rights: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.F2BDC647 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1029/2023jc020189 |
|---|