I.J. Losada

I.J. Losada
Universidad de Cantabria | UNICAN · Environmental Hydraulics Institute "IH Cantabria"

PhD. Civil Engineering

About

356
Publications
109,818
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13,620
Citations

Publications

Publications (356)
Article
In this work, a recently developed numerical model, capable of solving the hydro- and morphodynamics of the cross-shore beach profile, is used to gain insight into the relevant processes driving the generation of a breaker bar. The bedload and suspended sediment transport contributions are analysed separately. It has been shown that the bedload tra...
Conference Paper
Full-text available
The aim of this work is to validate and analyze with the numerical model OpenFOAM, the nonlinear interaction of a WEC under regular waves using the Overset framework. Previous techniques, such as deforming grid approaches, present problems to handle large body motions when modelling wave-structure interactions. Therefore, by means of the Overset me...
Data
This video shows the results of concentration fields produced by breaking waves simulated with the numerical model IH2VOF-SED. The top panel shows results during the first waves of the simulation, when the bathymetry is still nearly flat. The bottom panel shows the results after 24 minutes of wave action, when the bathymetry evolved forming a break...
Article
In this work, a new numerical model for cross-shore beach profile evolution, IH2VOF-SED, is developed. It consists in the bidirectional coupling of a 2D RANS hydrodynamic solver and a sediment transport module. The resulting model is extensively validated against three benchmark cases at different scales, attending to the hydrodynamics, bottom shea...
Article
Here, a methodology to obtain ensemble shoreline change projections at regional scale by combining multi-model projections of wave climate and water levels and the reduced-complexity shoreline evolution model in Alvarez-Cuesta et al. (2021) is presented. In order to account for climate change uncertainty, dynamically downscaled and bias corrected p...
Article
Full-text available
Adaptation requires planning strategies that consider the combined effect of climatic and non-climatic drivers, which are deeply uncertain. This uncertainty arises from many sources, cascades and accumulates in risk estimates. A prominent trend to incorporate this uncertainty in adaptation planning is through adaptive approaches such as the dynamic...
Article
Here, a methodology to obtain an ensemble of shoreline change projections at regional scale by combining multi-model projections of wave climate and water levels and the reduced-complexity shoreline evolution model in Álvarez-Cuesta et al. (2021) is presented. In order to account for climate change uncertainty, dynamically downscaled and bias corre...
Article
This study presents IH-LANS (Long-term ANthropized coastlines Simulation tool), a numerical model for addressing long-term coastline evolution at local to regional scales in highly anthropized coasts. In IH-LANS, a hybrid (statistical-numerical) deep-water propagation module and a data-assimilated shoreline evolution model are coupled. Longshore an...
Article
Full-text available
Future projections of coastal erosion, which are one of the most demanded climate services in coastal areas, are mainly developed using top-down approaches. These approaches consist of undertaking a sequence of steps that include selecting emission or concentration scenarios and climate models, correcting models bias, applying downscaling methods,...
Article
Full-text available
Based on a novel approach, present-day and future spectral wind-wave conditions in a high-emission scenario from a seven-member wave climate projection ensemble are compared. The spectral analysis at the selected locations aids in understanding the propagation of swell projected changes from the generation areas across the ocean basins. For example...
Article
The development of the marine renewable energy and offshore aquaculture sectors is susceptible to being affected by climate change. Consequently, for the long-term planning of these activities, a holistic view on the effects of climate change on energy resources and environmental conditions is required. Based on present climate and future climate s...
Presentation
VIDEOS: 1) Wave overtopping for oblique waves on a vertical breakwater on a rubble-mound foundation (https://vimeo.com/456919845) 2) Regular waves interaction with a vertical breakwater on a rubble-mound foundation (https://vimeo.com/456919285) 3) Coupled mooring analysis of a semisubmersible floating offshore wind platform using the Overset framew...
Article
Port development -as key aspect of sustained economic growth- implies large investments in coastal structures, increasing the risk of structural failures and operational stoppages due to coastal hazards. Then, this paper presents a new approach to statistically characterize and simulate the long-term wave climate to be applied in port risk assessme...
Article
Full-text available
Abstract The accurate modelling of the landslide‐generated tsunami characteristics in the so‐called near‐field is crucial for many practical applications. In this paper we present a new full‐3D numerical method for modelling tsunamis generated by rigid and impermeable landslides in OpenFOAM® based on the Overset mesh technique. The approach has bee...
Article
Developing future projections of shoreline change requires a good understanding of the driving coastal processes. These processes result primarily from the combination of mean sea level, waves, storm surges and tides, which are affected by global and regional climate change, and whose uncertainty increases with time. This paper reviews the current...
Conference Paper
Full-text available
SE@PORT project aims to improve the overall performance of a single Wave Energy Converter (WEC), developing hybrid systems that combine the use of two technologies over and above individual working principles. An oscillating water column (OWC) and an overtopping converter (OBREC-type in this case) have been designed to be included in Las Palmas har...
Presentation
In recent years, the increase of computational resources make numerical models for studying real fluid-structure interactions very popular.Thus, strong, robust and accurate numerical tools are needed to solve problems more efficiently.Movable structures like wave energy converters (OWC) or floating offshore wind turbines (FOWT), moored ships or flo...
Conference Paper
Full-text available
Probabilistic design analysis is highlighted as a powerful tool during the design/planning phases due to its capability to simulate the hydraulic performance of coastal structures along their lifetime in a context of uncertainty. In this work, a novel methodology for applying a probabilistic approach for non-conventional breakwaters in shallow wate...
Conference Paper
The aim of the present paper is to give some preliminary guidelines for the design of recurved parapet wall.The results of the work are carried out by menas of numerical simulations, carried out with OpenFOAM ®. The goal is to describe the influence of the wave period on the confined-crest impact (Castellino et al., 2018). The confined-crest impact...
Article
In a context of growing concern about climate change and its potential consequences for coastal systems, adaptation is becoming more important than ever before. This paper presents a national planning framework for adaptation to climate change, which is pioneer in the field as it is multi-sectoral and focuses specifically on coastal areas, pursuing...
Article
Full-text available
In a time span of over 3,000 years, the function of harbor breakwaters has remained the same (i.e., the energy dissipation), with differences depending on the general breakwater configurations: rubble mound breakwaters or caisson breakwaters. The recent demands of the sea level rise and the intensification of extreme events related to climate chang...
Article
Full-text available
This study investigates the capacity of a Spartina alterniflora meadow to attenuate waves during storm events based on field observations in the Chesapeake Bay. These observations reveal that environmental conditions including the ratio between water depth and plant height (hr), the ratio between wave height (HS) and water depth, and current direct...
Article
Full-text available
Coastal development and climate change are dramatically increasing the risks of flooding, erosion, and extreme weather events. Coral reefs and other coastal ecosystems act as natural defenses against coastal hazards, but their degradation increases risk to people and property. Environmental degradation, however, has rarely been quantified as a driv...
Presentation
In recent years, there has been an increasing interest in modelling floating structures in marine environments. A considerable amount of research has been done in the fields of renewable energy, naval engineering and oil-gas industry. Movable structures like wave energy converters (OWC) or floating offshore wind turbines (FOWT), moored ships or flo...
Article
Disruptions in harbor operations have significant implications for local, regional and global economies due to ports strategic role as part of the supply chain. A probabilistic evaluation of port operations considering the influence of climate change is required in order to secure optimal exploitation during their useful life. Here, we propose a hy...
Article
Despite the potential applicability of seasonal forecasting for decision making in construction, maintenance and operations of coastal and offshore infrastructures, tailored climate services have yet to be developed in the marine sector. In this work, we explore the potential of a state-of-the-art seasonal forecast system to predict wave conditions...
Article
Understanding the hydrodynamic performance of floating energy converters is a complex challenge. Hence, physical modelling is necessary to evaluate the performance of innovative designs and validate them. The present paper shows the experimental work performed to validate a new floating semisubmersible structure which combines wave energy converter...
Article
This work represents the first attempt to study the behavior of sea level extreme events nearshore using satellite altimetry data. A novel approach based on the application of a nonstationary extreme model to nontidal residual monthly maxima from remote data is presented. With the aim of countering the lack of accuracy, an extreme scale factor to c...
Article
Shoreline recession due to the combined effect of waves, tides and sea level rise is increasingly becoming a major threat to beaches, one of the main assets of seaside tourist destinations. Given such an uncertain future climate and the climate-sensitive nature of many decisions that affect the long term, there is a growing need to shift current ap...
Technical Report
Full-text available
Coral reefs and dune systems provide substantial risk reduction benefits to people and property, and the loss of just one meter of reef crest or dune height can significantly increase risk. Coral reef and dune conservation and restoration could, therefore, be an important part of the solution for reducing risks from natural hazards in Quintana Roo...
Article
Full-text available
In the context of growing concern about the threat of flooding posed by climate change in coastal areas, the Spanish plan for coastal adaptation to climate change gave rise to stringent requirements on risk consequence estimates at the regional scale O (100 km). Within this framework, we propose a methodology that combines high space-time resolutio...
Article
Full-text available
As the world’s population grows to a projected 11.2 billion by 2100, the number of people living in low-lying areas exposed to coastal hazards is projected to increase. Critical infrastructure and valuable assets continue to be placed in vulnerable areas, and in recent years, millions of people have been displaced by natural hazards. Impacts from c...
Data
Complete list of data sources. (PDF)
Data
Various outputs from Self-Organizing Maps and K-Means algorithms. (PDF)
Conference Paper
Full-text available
This work presents a Level III approach for calculating the ultimate limit states (ULS) of the type section of Laredo's breakwater. The proposed method is based on the simulation of many loading cycles over the breakwater, counting how often the failure threshold of each element is exceeded. A climate emulator based on weather patterns is used to c...
Conference Paper
Full-text available
This paper presents a review of the most significant open questions underlying choices in the development of flood and erosion risk assessments in coastal areas. Within a context of deep uncertainty, probabilistic frameworks are emerging strongly as the most suitable paradigms for assessing climate change impacts and identifying adaptation options....
Conference Paper
Full-text available
In the present paper, a two-dimensional VOF-type model (IH2-VOF) based on the Volume-Averaged Reynolds-Averaged Navier-Stokes equations (VARANS) is used to study the wave interaction with a non-conventional rubble-mound breakwater integrated with an Overtopping Device denominated OBREC, an acronym for Overtopping BReakwater for Energy Conversion. T...
Article
This paper presents a methodology to evaluate the influence of downtime on the long-term energy yield of a floating wind farm. It is based on the definition and integration of three models: a discrete event model, which simulates failures and reparation times, a floating wind turbine model, which simulates platform motions and operational stops, an...
Article
One approach to identifying and mapping the state of marine biophysical conditions is the identification of large-scale ecological units for which conditions are similar and the strategies of management may also be similar. Because biological processes are difficult to directly record over large areas, abiotic characteristics are used as surrogate...
Conference Paper
Full-text available
Coastal habitats can substantially reduce the damages caused by coastal storms. However, the value of these natural defences is still not fully recognised. Consequently habitats are being destroyed or severely degraded in many parts of the world. Furthermore, despite widespread interest in natural and nature based coastal defence solutions, the upt...
Article
Full-text available
Global multi-model wave climate projections are obtained at 1.0°x1.0° scale from 30 CMIP5 Global Climate Model (GCM) realizations. A semi-supervised weather-typing approach based on a characterization of the ocean wave generation areas and the historical wave information from the recent GOW2 database are used to train the statistical model. This fr...
Article
Full-text available
Resumen En un contexto de crecientes impactos y riesgos socio-económicos en las costas del planeta, la protección costera basada en ecosistemas surge como un nuevo paradigma que une los principios de protección, sostenibilidad y resiliencia, a la vez que proporciona múltiples beneficios. Este artículo ofrece una perspectiva sobre qué son y cómo se...
Article
This study presents a comprehensive methodology that addresses climate change–induced coastal erosion at the regional scale O (100 km). The use of climate data with high space-time resolution enabled the reconstruction of the shoreline response to cross-shore forcing both historically and throughout the twenty-first century. Cross section–based equ...
Article
Full-text available
Coastal communities throughout the world are exposed to numerous and increasing threats, such as coastal flooding and erosion, saltwater intrusion and wetland degradation. Here, we present the first global-scale analysis of the main drivers of coastal flooding due to large-scale oceanographic factors. Given the large dimensionality of the problem (...
Article
Global wave hindcasts provide wave climate information for long time periods which helps to improve our understanding of climate variability, long term trends and extremes. This information is extremely useful for coastal studies and can be used both directly or as boundary conditions for regional and local downscalings. This work presents the GOW2...
Conference Paper
En los últimos años del siglo XX, se ha generalizado el uso de cajones flotantes en infraestructuras portuarias: muelles y otras estructuras de atraque, diques de abrigo verticales y diques especiales tipo flotante. Sin embargo, a pesar del uso extensivo de cajones flotantes como tecnología constructiva para obras de abrigo, a día de hoy existen nu...
Article
Full-text available
The aim of this paper is to provide a methodology to assess flooding risk associated to the combination of extreme flooding levels driven by Tropical Cyclone (TCs) and relative sea level rise (RSLR). The approach is based on the risk conceptual framework where the hazard, exposure, and vulnerability are defined and combined to address flooding soci...
Article
Full-text available
Wind resource availability determines the financial performance of wind farms as it is directly related to production. Offshore wind developers require great investments to design, build, operate and dismantle offshore wind farms. Furthermore, the investments in the offshore floating wind sector are expected to increase in the future. Because of th...
Article
Offshore wind energy is moving towards a future where the main challenge is to cope with the increasing water depth needed to access more and better wind resources. One of the first steps to be undertaken is the development of floating structures to support either wind turbines or measurement devices for the proper characterization of wind energy r...
Article
A regression-guided classification is implemented in statistical downscaling models based on weather types for downscaling multivariate wave climate and modelling extreme events. The semi-supervised method classifies the atmospheric circulation conditions (predictor) and the estimations from a regression model linking the circulation with local mar...
Article
The effect of vegetation patchiness on solitary wave propagation, attenuation and wave-induced forces is studied both experimentally and numerically. Vegetation patchiness is simulated with rigid cylinder configurations built by one, eight and four patches tested under emergent, near emergent and submerged conditions. These configurations are param...
Article
Focused on offshore wind energy operation and maintenance applications, this work presents a detailed accessibility analysis of the North Sea. After a review of existing normative dedicated to inspection and access of offshore wind turbines, a rigorous mathematical formulation of relevant accessibility parameters is given by means of the set theory...
Article
Full-text available
In this work, it is evaluated the accessibility of a floating platform, by means of a catamaran vessel equipped with a fender. The two bodies are modelled as a constrained multi-body system in the frequency domain. Transfer functions are calculated for the motions and forces of the system. Access is possible when no slip conditions occur at the fen...
Article
The mathematical modeling of the interaction of water waves with porous coastal structures has continuously been among the most relevant challenges in coastal engineering research and practice. Finding a tool to better predict essential processes, relevant to the functionality and stability of breakwaters and jetties, and how they are affected by p...
Article
Full-text available
Una de las principales amenazas para los sistemas costeros y las zonas bajas de todo el mundo es el incremento de los eventos de inundación debido a los efectos del cambio climático, fundamentalmente por el aumento del nivel medio del mar. Se presenta una metodología de análisis del impacto de inundación costera a escala regional —O (100km)—, que c...
Conference Paper
AcompletehydrodynamicstudyofaMultiUsePlatformdesigned to harvest energy from waves and wind is presented. The steps given in the study, and presented in this paper are: (i) the design of the platform, (ii) the laboratory tests performed at the Cantabria Coastal and Ocean Basin, (iii) the development of a new in-house time domain numerical model tha...
Conference Paper
There is a growing interest from offshore and energy industry towards floating wind turbines. Since these systems are exposed to harsh metocean conditions, accessibility for inspection and maintenance purposes becomes of primary importance for a safe and cost-effective long-term operation. It is here proposed a methodology for evaluating the access...