Alejandro Gómez-Pazo

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• PhD
• Lecturer at University of Leon

In this study, we propose a new baseline and transect method, the open-source digital shoreline analysis system (ODSAS), which is specifically designed to deal with very irregular coastlines. We have compared the ODSAS results with those obtained using the digital shoreline analysis system (DSAS). Like DSAS, our proposed method uses a single baseli...

Rocky coastal regions are often inaccessible due to steep slopes and high relief. Remotely sensed data can, therefore, be useful, but they often have low spatial and temporal resolution and, in the case of airborne LiDAR, if not publically available , are costly to obtain. This paper reports on the use of high-resolution images from unmanned aerial...

Most research on shore platforms has been at fairly large spatial scales over distances ranging from hundreds to thousands of metres. Other work at much smaller scales, ranging from one to several decimetres, often corresponds to the dimensions of micro-erosion meter stations. Few studies have been concerned with platform morphology in which the ba...

Previous studies using unmanned aerial vehicles and remote sensing techniques have provided data on group sediment dynamics and overall mobility of a boulder beach at Oia in Galicia, northwestern Spain. They recorded changes in the location and disposition of hundreds of clasts but were unable to trace the intermittent movement of individual boulde...

An unmanned aerial vehicle (UAV) was flown over a boulder beach (area 20,000 m²) on the southern coast of Galicia (northwestern Spain) in May 2016, continuing earlier work based on flights over the same beach in July 2012, May 2013, and late March 2014. Digital Surface Models (DSMs) with 1.8 cm resolution were constructed from the 2014 and 2016 dat...

Esta investigación se centra en la evolución de una playa de bloques en una barrera a lo largo de un lagoon en la isla de São Jorge. Las islas Azores están expuestas a condiciones de alta energía de oleaje. La respuesta geomorfológica de este sector ha llevado al desarrollo de un programa de seguimiento para evaluar las variaciones morfológicas a c...

Understanding the external and internal geodynamical processes shaping the Earth is challenging. Physical, chemical, and biological processes form the ground surface over time. Erosion, weathering, transporting, and sedimentation are the natural processes that shape landscapes. However, the continuous interactions of external geodynamic drivers, su...

The dynamic interaction between cliff, beach and shore-platform is key to assessing the sediment balance for coastal erosion risk assessments, but this is poorly understood. We present a dataset containing daily, 3D,colour LiDAR scans of a 450 m coastal section at Happisburgh, Norfolk, UK. This previously para-glaciated region comprises mixed sand-...

El capítulo se centra en la evolución reciente de las lagunas costeras en el contexto gallego. Se trata de un análisis detallado en el que se hace referencia a la gestión de estos sistemas y la importancia que tienen las medidas de preservación en el futuro.

El entorno costero de Caleta Española es una playa de bloques situada en la isla de Livingston (Antártida marítima), en las inmediaciones de la BAE Juan Carlos I. Este frente costero presenta múltiples morfologías en función del encajamiento de los materiales, su origen y su dinamismo. En este sentido, se ha realizado un trabajo de cartografía geom...

Galicia is a region marked by its relationship with the sea. Along its more than 2,000 km of coastline, many coastal typologies give it incredible biodiversity. In this work, we try to synthesize the existing knowledge about the Galician coasts with a vision at multiple scales, from the general one, where the coast is divided into three categories:...

The Courel Mountains Geopark is in Galicia, Northwest Spain. Its total area is 578.29 km2. Parallel valleys and ridges characterize its relief from North to South. Their maximum altitude reaches 1,641 m. Their lithology is dominated by slates, quartzites, and limestones, together with small diabase outcrops. Materials are intensely fractured due to...

The vulnerability study has historically been a significant field within coastal research. The relevance that has been given to this type of work must be added in recent years; the need to manage the coast in the context of global change, which increases the investigations that apply the Coastal Vulnerability Index (CVIs) exponentially. For this pr...

In coastal geomorphology research, the last few years have demonstrated the usefulness of new technologies to quantify variations and explain the current dynamics at a high level of detail and different scales. In this context, the present study analyzes changes in a boulder beach in southern Galicia (Oia, Pontevedra) between 2016 and 2023. This se...

This investigation analyses the erosion degree in the coastal edge sector of Punta Couso, a granitic area in the Galician coast (NW Iberian Peninsula). For this purpose, high-resolution images were used; geomorphological parameters, such as joint density or terrain ruggedness (calculated from LiDAR data) and fieldwork information obtained with Proc...

Coastal studies have a great relevance historically. This increase in the last with the new technologies and the possible global change impact. In this context, open-source tools represent a key element in these investigations. The present project analyzes the advantages and problems of open-source tools for estimate coastal variations and volumetr...

The Trevinca Massif is in the northwestern Iberian Peninsula, on the border between Galicia and Castilla-León. Its highest elevation is 2124 m at the Trevinca peak. During the Pleistocene, an extensive icefield developed in this area, occupying the flattened surfaces in the high massif zones, and generating several glacier valleys. In the occidenta...

This study developed a series of new, semi-automated methods for quantitatively analysing the contribution of rock weathering processes and geological control on shore platform evolution and boulder production. We used high resolution Digital Surface Models (DSMs) and orthoimages to map and classify a series of geomorphological and geological contr...

Structural and lithological control has a key role in the shape of the rocky coast and its dynamics. Therefore, deepening the knowledge about these zones is one of the main aims for the future. In this sense, a granitic-gneissic sector was analyzed in the Galician coast (NW Iberian Peninsula) to understand their past and future evolution. For the c...

El estudio de las variaciones costeras ha tenido históricamente una gran importancia en el ámbito de los estudios litorales. Este trabajo analiza la idoneidad del uso de ODSAS (Open Digital Shoreline Analysis System), una herramienta open source para la estimación de las variaciones costeras, en relación con el DSAS (Digital Shoreline Analysis Syst...

Esta investigación analiza la importancia del control estructural en la dinámica de las costas rocosas a partir de la fotointerpretación y la elaboración de campañas de trabajo de campo en las que se midieron megabloques y posibles sectores fuente. Esto permitió diferenciar dos fases de acumulación, una a unos 3 m sobre el nivel del mar actual, y o...

Resumen de la tesis doctoral de Alejandro Gómez Pazo, presentada en la Universidad de Santiago de Compostela con el título "Aplicación de novas tecnoloxías no estudo da costa de Galicia dirixidas a unha nova xestión no contexto do cambio global". Publicado en la sección de tesis doctorales del Boletín de la Asociación de Geógrafos Españoles

Coasts are continually changing and remote sensing from satellite has the potential to both map and monitor coastal change at multiple scales. This study aims to assess the application of shorelines extracted from Multi-Spectral Imagery (MSI) and Synthetic Aperture Radar (SAR) from publicly available satellite imagery to map and capture sub-annual...

The aim of this research is to deepen the knowledge of rocky coasts in general, and the Galician coasts in particular. This project carries out an analysis in different scales using the new technologies as the base to improve the coastal knowledge. Devices such as the Equotip are used at the microscale, in the mesoscale this project used RFID (Radi...

Os humidais costeiros desempeñan un papel esencial na conservación da biodiversidade, pero tamén no control da calidade das augas de baixa profundidade da costa e como sumidoiros do CO 2 atmosférico, funcións estas non sempre recoñecidas. Malia a súa importancia ecosistémica, no contexto global, pero tamén galego, ao longo das últimas décadas asist...

Rocky coasts represent three quarters of all coastlines worldwide. These areas are part of ecosystems of great ecological value, but their steep configuration and their elevation make field surveys difficult. This fact, together with their lower variation rates, explains the lower numbers of publications about cliffs and rocky coasts in general com...

This work analyzes the evolution of the large shifting dune included in the Corrubedo Natural Park from 1956 until the present day. The analysis was carried out using aerial images, orthophotographs, topographic surveys and LiDAR (Light Detection and Ranging) data. Variations were analyzed in terms of four different aspects: evolution of pathways i...

The Natura 2000 network is an ambitious European project aimed at nature conservation. Nevertheless, the identification and delimitation of habitats is a complex task and simultaneously essential for correct ecosystem management. In this study we compared the current habitat delimitation and designation and the results produced by Geographic Inform...

In the Iberian Peninsula, the Alpine juniper (Juniperus communis subsp. alpina) scrub constitutes a Subalpine community associated with the highlands. After some considerations regarding its taxonomy, results are provided through vegetation mapping of two extreme locations where it can be found: Montseny Massif, located south-east of the Pyrenees,...

More information: http://alejandrogomezpazo.com/en/bsg-sheffield/

La presente investigación se centra en el análisis de los cambios volumétricos producidos en una playa de bloques de granitos de grano medio localizada en una costa de alta energía en donde durante el invierno las olas pueden superar los 9 metros. En estudios previos se demostró la gran movilidad de este sector en el período 2012-2014 usando la car...

Coastal lagoons are habitats of great environmental value. However, they are currently subject to major threats, particularly due to increasing sea levels. This study aims to identify changes—both natural and induced by anthropic activity—and their impact on the recent evolution of three different types of coastal lagoons in Galicia (Louro, Vixán,...

Sedimentary coastal areas change rapidly and are economically and environmentally important. This research focuses on determining the extent to which natural dynamics and human activity have contributed to visible changes on Rodas, Cíes Islands in southwestern Galicia (NW Spain). The number of visitors to the islands has increased in recent years,...

The coastline of Galicia is more than 2100 km long (POL Galicia 2010) (Fig. 2.1). Two broad types of coast can be differentiated in the region: zones with rías and zones without rías. Marine inlets dominate in the former, whereas rectilinear stretches dominate in the latter and only small coves or estuaries occur. The megaforms of coastal relief in...

En este estudio se pretende clasificar distintas zonas del litoral gallego para así poder visualizar con claridad sus diferencias y analizar las razones que marcan los distintos paisajes. Para alcanzar este objetivo inicialmente se realizó un análisis cuantitativo en el que se han considerado la altitud del sector costero (6 categorías) y la rugosi...

The coast of Galicia has more than 2.100 km for length. It is characterized by the chaining of rocky and sandy coast and it's located in a high energy context, subject to the passage of depressions and marine storms. In the context of global change, it is essential to know the dynamics that interact in the Galician coast to identify the most vulner...

La costa de Galicia tiene más de 2.100 km de longitud. Se caracteriza por el encadenamiento de sectores de costa rocosa y arenosa y se halla situada en un contexto de alta energía, sometida al paso de borrascas y temporales marinos. Por ello, en el contexto del cambio global en el que nos encontramos, es fundamental conocer las dinámicas que intera...

Recent technological advances have made it possible to improve the accuracy of coastal studies through devices such as RFID (Radio Frequency IDentification). These sensors allow the monitoring of elements of the environment at any time since its placement and offer a great level of detail. This research is developed in a boulder beach in Oia (Ponte...

Esta investigación busca profundizar en el conocimiento de las costas rocosas en general, y de las gallegas en particular. En el estudio se realizarán análisis a tres escalas: en la microescala se emplearán sensores TMEM para comprobar la microerosion en la costa sur gallega. En la mesoescala el estudio se realizará con sensores RFID para conocer l...

This study proposes a model of danger of ignition of wildfires in Galicia, the Spanish region with more fires recorded annually caused mostly by human causes. The model is based on the one proposed by Chuvieco et al. (2014), improving the spatial resolution from 1000 to 500 m, creating specific layers of human and natural causality and keeping meth...

La preocupación por las regiones costeras ha sido muy importante a lo largo de la historia. En los últimos años, con la evolución experimentada por los SIG ha surgido una gran oportunidad de profundizar en su mejor conocimiento. La presente investigación se ha centrado en buscar una aproximación metodológica semiautomática a las costas rocosas que...

Caracterización de los tipos de costa que se pueden encontrar en las Illas Cíes mediante el empleo de Sistemas de Información Geográfica (SIG).

Located at the entrance of Ría de Vigo, Illas Cíes stand out for its asymmetrical profile, with two very different facades. On the western facade, cliffs dominate reaching over 160 m of altitude and 80º slope. The eastern facade is characterized by a smooth topography with slopes that do not reach 75º and heights not exceeding 150 m chaining cliffs...