-RESUMEN: Shoreline position is a key parameter of a beach state, used as a descriptor of the system response to changes in external forcings, such as sea-level rise. Changes in shoreline position are the result of hydro- and morphodynamic processes taking place in the nearshore, including feedback mechanisms. Due to this complexity, state-of-the-art methodologies aimed at reproducing the variability of the shoreline are based on several assumptions that simplify the problem. One of the most widespread methods uses a beach equilibrium profile whose shape depends only on the beach morphology (i.e., beach slope, berm) and whose location varies with sea level. We derived a general equation for shoreline evolution using the equilibrium profile, and we used it to evaluate the contribution of sea-level rise to shoreline evolution under wave forcing. We also derived analytical closed-form expressions to this shoreline evolution for a 2/3-power curve equilibrium profile and for three different probability distributions of breaking wave height (corresponding to three different families commonly used to describe wave climate). When used to analyze the effects of sea-level rise, it is not constrained to sea-level rises small compared to the berm height.
-FECHA: viernes 28/01/2022 a las 11:00
- LUGAR: Sala de seminarios IMEDEA y online. Actualmente, el aforo de la sala de seminarios es de 9 personas, así que recomendamos seguir el seminario de forma virtual, a través del siguiente link de ZOOM: https://uibuniversitat.zoom.us/j/87953742566 (ID de la reunión 87953742566).
El Dr. Alejandro Orfila Förster se encargará de certificar la asistencia a aquellos estudiantes que lo soliciten. Para ello, es necesario que le envíen un e-mail a la dirección firstname.lastname@example.org , indicando: Titulo del Seminario, Ponente, Nombre completo del Estudiante, Programa de Estudios y Universidad. No se atenderán peticiones fuera del plazo.
Microscale Ocean Biophysics Seminar Series: Oscar Guadayol (U. Lincoln, UK)
Start: 02/02/2022 17:00 - End: 02/02/2022 18:00Place: Zoom (link in the description)
U. Lincoln (UK)
An engineering tool for a phytoplankton cell
Viscosity is critically important to planktonic life, as it affects both the rate of diffusion of molecules and the motility of microbes. And yet, it is a property that has been traditionally neglected by physical oceanography because water viscosity is well constrained by temperature, salinity and pressure. We know, however, that exopolymeric substances (EPS) released by marine organisms can alter the bulk viscosity of seawater at large scales. The role of EPS in physically structuring the microscale environment remains hypothetical. We used microrheological techniques to map viscosity with micron resolution around phytoplankton cells and inside aggregates, revealing the existence of steep gradients at the microscale. These gradients, as our numerical models show, can alter the dynamics and spatial structure of the chemical landscape and affect the motility and chemotactic performance of bacteria. Altogether this suggests that secreting EPS could be a good strategy for a phytoplankton cell to scaffold the phycosphere and optimize both resource acquisition and interactions with bacteria.
25/01/2022 'International Day of Women and Girls in Science' 2022 at IMEDEA
27/01/2022 Rapid atoll flood risk assessment
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