https://hdl.handle.net/10481/32217 Sat, 11 Apr 2026 22:10:47 GMT 2026-04-11T22:10:47Z https://hdl.handle.net/10481/92796 Effect of wind conditions on the performance of an Oscillating Water Column energy converter Molina Salas, Ángel; Clavero Gilabert, María; Moñino Ferrando, Antonio https://hdl.handle.net/10481/92796 https://hdl.handle.net/10481/80462 Method to assess the interplay of slope, relative water depth, wave steepness, and sea state persistence in the progression of damage to the rock layer over impermeable dikes Losada Rodríguez, Miguel Ángel The objective of this research was to develop a new methodology to assess the progression of damage to sloped coastal structures such as revetments, dikes, and mound breakwaters by applying dimensional analysis. The adequacy of the derived functional relationship was verified with the same experimental data (rock layer over impermeable dikes under irregular waves and four dike slopes) originally used to obtain the Van de Meer stability formula. The method addresses the epistemic uncertainty of the damage evolution model and its dependence on the experimental design and technique, the non-dimensional incident sea-state characteristics at the foot of the slope, relative water depth, relative wave height, wave steepness, sea-state persistence, and number of waves. It is specific to each dike slope. Specifically, the scarcity of experimental data in shallow water conditions are considered. Accordingly, the sigmoid function is proposed as an alternate model to quantify the progression. In the current state of knowledge, it is uncertain how the formulas based on lab-experiments perform for realworld design conditions. More research in the form of further test series is thus necessary to explore this new approach in greater depth. https://hdl.handle.net/10481/80462 https://hdl.handle.net/10481/78619 German to Spanish translation of Einstein’s work on the formation of meanders in rivers Padilla, Enrique M.; Emberger, Birgit L.; Díez Minguito, Manuel In 1926 Albert Einstein gave a clear explanation of the physical processes involved in the meander formation and evolution in open channels (Einstein, 1926). Although this work is far from being recognized as one of his greatest achievements, such as his annus mirabilis papers in 1905, he shows a truly remarkable didactic skills that make it easy to understand even to the non- specialist. In particular, a brilliant explanation of the tea leaf paradox can be found in this paper of 1926, presented as a simple experiment for clarifying the role of Earth rotation and flow curvature in the differential river banks erosion. This work deserves to be considered as a pioneering work that has laid a basic knowledge in currently very active research fields in fluvial geomorphology, estuarine physics, and hydraulic engineering. In response to the curiosity aroused and transmitted to the authors over the years by undergraduates and MSc. students, and also due to its historical and scientific significance, we present here the Spanish translation of Einstein’s original work published in German in 1926 in Die Naturwissenschaften (Einstein, 1926). Einstein’s drawings have not been interpreted, but just updated preserving their original spirit. https://hdl.handle.net/10481/78619 https://hdl.handle.net/10481/78617 Observational evidences of strain-induced periodic stratification (SIPS) in the Gualdalquivir Estuary Díez Minguito, Manuel; Swart, H. E. The G&M14 stratification-circulation diagram allows to classify estuaries on the basis of river flow and tidal forcing in terms of the freshwater Froude number and a mixing parameter that accounts for the vertical structure of the water column [Geyer & MacCready, 2014]. In this study, instead of computing these parameters for the whole estuary as was originally proposed by these authors, both are computed locally, at different stretches along the Guadalquivir estuary. The analysis is based on the data collected at 21 stations in a 3 year continuous monitoring campaign (2008–2011), during which the estuary experienced a wide range of environmental conditions [Navarro et al., 2011]. Remarkably, the results reveal that conditions in the inner stretches fall most of the time in the Strain-Induced Periodic Stratification (SIPS) regime mapped in the G&M14 diagram [Simpson et al., 1990]. Near the mouth, the estuary is mostly partially-mixed. Freshwater discharges may shift the state of the lower stretches toward a salt-wedge structure whose location depends strongly on the fresh water volume discharged. Estimates of the Simpson number during the same period confirm this picture. The SIPS regime implies that the covariance between eddy viscosity and vertical shear of the longitudinal current drives part of the subtidal circulation, even more efficiently than the classical gravitational circulation does [Burchard & Hetland, 2010]. This may have a significant impact on the estuarine suspended matter distribution. Results further point out the limitations of estuarine classification of estuarine systems as a whole on the basis of stratification-circulation diagrams. Even spatially close stretches may transit different regions of the G&M14 diagram. A specific stretch of an estuary may change its structure and its state in the stratification-circulation diagram may undergo large excursions under changing environmental conditions. http://isms.gal/wp-content/uploads/2018/06/eof-libro-abstracts-definitivo.pdf https://hdl.handle.net/10481/78617 https://hdl.handle.net/10481/71689 Estudio de la circulación secundaria en el tramo bajo e intermedio en el Estuario del Guadalquivir Reyes Merlo, Miguel Ángel En este Trabajo Fin de Máster se estudia la circulación secundaria en el tramo bajo e intermedio del estuario del Guadalquivir, tanto en régimen de aguas bajas como de avenidas. Del análisis de los procesos que originan esta circulación se desprende que los mecanismos más relevantes son aquellos relacionados tanto con la advección del flujo lateral y longitudinal como con la fricción interna y de los contornos, en donde los efectos de la rotación de la Tierra pasan a desempeñar un papel secundario. Los resultados indican que la dinámica y la morfología del tramo superior condicionan decisivamente la circulación secundaria en el tramo bajo, a pesar de estar influenciada por otro tipo de procesos derivados de una mayor estratificación. https://hdl.handle.net/10481/71689