Juan De la Riva

Juan De la Riva
University of Zaragoza | UNIZAR · Department of Geography and Territorial Planning

Dr. Geography

About

118
Publications
42,466
Reads
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3,320
Citations
Citations since 2017
26 Research Items
2063 Citations
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Introduction
Juan de la Riva currently works at the Department of Geography and Territorial Planning , University of Zaragoza. Juan does research in Remote Sensing, Geography and Cartography. Their current project is 'SERGISAT - Severity and Regeneration after large forest fires from satellite RS and GIS: Assessment of regeneration (CGL2014-57013-C2-2-R).'
Additional affiliations
February 1999 - present
University of Zaragoza
Position
  • Senior Lecturer in Geography (Profesor Titular de Geografía)
Description
  • - Degree in Geography (Regional Geographical Analisys). - Master in GIS and Remote Sensing. - Master in Territorial and Environmental Planning.
September 1989 - present
University of Zaragoza
Position
  • Professor (Full)
Education
November 1994
University of Zaragoza
Field of study
  • Geography

Publications

Publications (118)
Article
Full-text available
Identification of forest fuels is a key step for forest fire prevention since they provide valuable information of fire behavior. This study assesses NASA’s Global Ecosystem Dynamics Investigation (GEDI) system to classify fuel types in Mediterranean environments according to the Prometheus model in a forested area of NE Spain. We used 59,554 GEDI...
Book
Bajo el lema "TIG al servicio de los ODS", con el XIX Congreso de Tecnologías de la Información Geográfica se ha querido contribuir a la consecución de los ODS 2030, evidenciando la potencialidad de las geotecnologías e identificando los objetivos y las metas a los que colabora la actividad de la comunidad TIG para transformar el contexto económico...
Article
Full-text available
Secondary succession (SS) is one of the main consequences of the abandonment of agricultural and forestry practices in rural areas, causing -among other processes- woody encroachment on former pastures and croplands. In this study we model and monitor the spatial evolution of SS over semi-natural grassland communities in the mountain range of the P...
Article
Full-text available
Fuel type is one of the key factors for analyzing the potential of fire ignition and propagation in agricultural and forest environments. The increase of three-dimensional datasets provided by active sensors, such as LiDAR (Light Detection and Ranging), has improved the classification of fuel types through empirical modelling. Empirical methods are...
Article
Full-text available
Mediterranean forests are recurrently affected by fire. The recurrence of fire in such environments and the number and severity of previous fire events are directly related to fire risk. Fuel type classification is crucial for estimating ignition and fire propagation for sustainable forest management of these wildfire prone environments. The aim of...
Article
In the three last decades, continental Ecuador biosphere reserves (CEBRs) have undergone important land cover transformations because of human‐managed systems such as agriculture, livestock, forestry, and urbanization. Thus, the native landscape structure has been altered exhibiting a mosaic of patches with varying sizes and shapes. The resulting l...
Presentation
Full-text available
The complex dynamics of changes in land use and land cover at different scales cause changes in the composition and configuration of the landscape. Deforestation, mainly caused by the transformation of forest to agricultural land, has been one of the most representative changes in recent years worldwide. In Ecuador, this transformation has occurred...
Article
The current research belongs to a series of two manuscripts aiming at describing spatial-temporal dynamics of fire regime and its drivers in Spain. In this work, we present the first attempt to produce a spatial-temporal delimitation of homogeneous fire regime zones in Spain providing insights into the near future. The analyses were based on histor...
Article
Fire regimes are evolving worldwide driven by socioeconomic and environmental changes. Understanding the forces behind fire regime dynamics is essential to achieve effective wildfire management and policymaking. The current research belongs to a series of two manuscripts aimed at describing spatial-temporal dynamics of fire regime and its drivers i...
Article
Full-text available
The estimation of forest residual biomass is of interest to assess the availability of green energy resources. This study relates the Pinus halepensis Miller forest residual biomass (FRB), estimated in 192 field plots, to several independent variables extracted from Airborne Laser Scanner (ALS) data in Aragón region (Spain). Five selection approach...
Article
Full-text available
This study assesses model temporal transferability using airborne laser scanning (ALS) data acquired over two different dates. Seven forest attributes (i.e. stand density, basal area, squared mean diameter, dominant diameter, tree dominant height, timber volume, and total tree biomass) were estimated using an area-based approach in Mediterranean Al...
Article
In this paper we investigate spatial-temporal associations of fire weather danger and fire regime features from 1979 to 2013. We analyze monthly time series of fire activity (number of fires and burned area) and fire weather danger rating indices (Fire Weather Index, Burning Index and Forest Fire Danger Index) at two spatial scales: (i) regionally,...
Article
Over the last decades, authorities responsible on forest fire have encouraged research on fire triggering factors, recognizing this as a critical point to achieve a greater understanding of fire occurrence patterns and improve preventive measures. The key objectives of this study are to investigate and analyze spatial-temporal changes in the contri...
Poster
Full-text available
The goal is to investigate the potential relationships between drought, fire frequency (N) and burned area (BA) in different scenarios of fire size (all fires, >1 ha and >100 ha) and ignition source (natural, unintended and arson) from 1974 to 2013. Understanding the contribution of dry periods to forest fire behaviour is a key factor to determine...
Presentation
Full-text available
Fire danger rating indexes based on weather data are a well-established way to identify favorable ignition-spread conditions. In this study, we investigate the association between FWI (Canadian Fire Weather Index), BI (US Burning Index) and FFDI (Australian Forest Fire Danger Index) with fire occurrence (N) and burnt area size (BA) at regional leve...
Article
Full-text available
The account of total biomass can assist with the evaluation of climate regulation policies from local to global scales. This study estimates total biomass (TB), including tree and shrub biomass fractions, in Pinus halepensis Miller forest stands located in the Aragon Region (Spain) using Airborne Laser Scanning (ALS) data and fieldwork. A compariso...
Article
Full-text available
Mediterranean pine forests in Spain experience wildland fire events with different frequencies, intensities, and severities. An estimation of the fire severity as accurate as possible is required by forest managers to decide which strategy is most appropriate to mitigate the effect of fire. The aim of this research is to estimate the post-fire seve...
Article
Understanding fire regime is a crucial step towards better knowledge of the wildfire phenomenon. However, the concept itself, in spite of its widespread use, still lacks a clear, widely accepted definition and there is no general agreement on which features define it best. In this paper we provide an in-depth characterization and description of fir...
Article
Full-text available
This paper explores spatial–temporal dynamics in fire regime features, such as fire frequency, burnt area, large fires and natural- and human-caused fires, as an essential part of fire regime characterization. Changes in fire features are analysed at different spatial – regional and provincial/NUTS3 – levels, together with summer and winter tempora...
Article
Full-text available
The knowledge of the forest biomass reduction produced by a wildfire can assist in the estimation of greenhouse gases to the atmosphere. This study focuses on the estimation of biomass losses and CO 2 emissions by combustion of Aleppo pine forest in a wildfire occurred in the municipality of Luna (Spain). The availability of low point density airbo...
Article
Full-text available
This paper explores spatial-temporal dynamics in fire regime features, such as fire frequency, burnt area, large fires, and natural- and human-caused fires, as an essential part of fire regime characterisation. Changes in fire features are analysed at different spatial–regional and provincial/NUTS3 levels, together with summer and winter temporal s...
Article
The aim of study is to map the carbon dioxide (CO2) emission of the aboveground tree biomass (AGB) in case of a fire event. The suitability of low point density, discrete, multiple-return, Airborne Laser Scanning (ALS) data and the influence of several characteristics of these data and the study area on the results obtained have been evaluated. A s...
Conference Paper
Full-text available
Small fires, i.e. fires smaller than 1 Ha, represent a huge proportion of total wildfire occurrence in the Mediter-ranean region. In the case of Spain, around 53% of fires in the period 1988-2013 fall into this category according to the Spanish EGIF statistics. However, the proportion of small fires is not stationary over time. Small fires are usua...
Conference Paper
Full-text available
Understanding fire regime is a crucial step towards achieving a better knowledge of the wildfire phenomenon. This study proposes a method for the analysis of fire regime based on multidimensional scatterplots (MDS). MDS are a visual approach that allows direct comparison among several variables and fire regime features so that we are able to unrave...
Article
Full-text available
Fire regimes are strongly dependent on human activities. Understanding the relative influence of human factors on wildfire is an important ongoing task especially in human-dominated landscapes such as the Mediterranean, where anthropogenic ignitions greatly surpass natural ignitions and human activities are modifying historical fire regimes. Most h...
Thesis
Full-text available
Cities have experienced a significant growth in the last century due to increasing world population, industrialization, and the wealth’s and job’s concentration in urban areas, making them most important globally. The Geographic Information Sciences and Technologies (GIS and remote sensing) can be useful for urban studies and analysis, as well as i...
Article
Little research has focussed on the use of low point density airborne laser scanning (ALS) technology in Mediterranean Aleppo pine (Pinus halepensis Mill.) forest to derive key stand characteristics for forestry. The objective of this research was to develop models of Aleppo pine structural variables from ALS point clouds with a point density of 1...
Article
Light detection and ranging (LiDAR) is an emerging remote-sensing technology with potential to assist in mapping, monitoring, and assessment of forest resources. Despite a growing body of peer-reviewed literature documenting the filtering methods of LiDAR data, there seems to be little information about qualitative and quantitative assessment of fi...
Article
Airborne Laser Scanning (ALS) is capable of estimating a variety of forest parameters using different metrics extracted from the normalized heights of the point cloud using a Digital Elevation Model (DEM). In this study, six interpolation routines were tested over a range of land cover and terrain roughness in order to generate a collection of DEMs...
Conference Paper
Full-text available
Tree biomass estimate is essential for carbon accounting, bioenergy feasibility studies, and forest sustainable management. This fact, added to the availability of airborne laser scanning (ALS) information, provided by the Spanish National Plan for Aerial Orthophotography (PNOA), and the existence of little research focusing on the use of ALS techn...
Article
Full-text available
This report details the preliminary results of the research focused on Roman archaeological heritage in the Middle Ebro Valley (Spain). The principal objective of this project was to obtain several different readings by means of a UAV equipped with different sensors. Firstly, it has been possible to obtain accurate maps, 3D models and digital eleva...
Article
El aumento de la mortalidad y la pérdida de vitalidad de los bosques son procesos que afectan a diversas especies de árboles y biomas. Estos fenómenos de decaimiento forestal se han asociado a la interacción de múltiples factores relacionados con el cambio global, como el aumento de las sequías o la mayor incidencia de factores bióticos que generan...
Article
This study aims to develop a method to estimate the recovery time of plant communities after high-severity wildfires. The designed methodology is based on map algebra and a geographical information system, which enabled calculation of the approximate time required to restore vegetation to conditions similar to pre-fire regarding plant height and ca...
Article
Full-text available
Fire risk assessment should take into account the most relevant components associated to fire occurrence. To estimate when and where the fire will produce undesired effects, we need to model both (a) fire ignition and propagation potential and (b) fire vulnerability. Following these ideas, a comprehensive fire risk assessment system is proposed in...
Article
Full-text available
Outbreak insects are among the major biotic disturbances affecting Mediterranean forests by reducing their growth and vitality through severe defoliations. Despite their relevance for the management of these drought-prone areas, we lack information on the relationships between growth, canopy cover and insect defoliations at ample spatial and tempor...
Article
Full-text available
Land Surface Temperature (LST) is one of the key inputs for Soil-Vegetation-Atmosphere transfer modeling in terrestrial ecosystems. In the frame of BIOSPEC (Linking spectral information at different spatial scales with biophysical parameters of Mediterranean vegetation in the context of global change) and FLUXPEC (Monitoring changes in water and ca...
Article
Mediterranean pine forests in Spain experience wildland fire events with different frequencies, intensities, and severities which result in diverse socio-ecological consequences. In order to predict fire severity, spectral indices derived from remotely sensed images have been used extensively. Such spectral indices are usually used in combination w...
Article
Full-text available
Fully polarimetric C- and L-band synthetic aperture radar (SAR) data have been investigated to determine the relationship between polarimetric target decomposition components and forest burn severity over two sites located in a Mediterranean environment. The dependence of the polarimetric decomposition metrics on SAR acquisition geometry and enviro...
Chapter
The Ebro valley around Zaragoza is characterised by Quaternary alluvial river terraces that have been deposited on Tertiary gypsum karst. These alluvial deposits are an important economic factor for sand and gravel mining and for agriculture but also represent an important groundwater reservoir. Due to the fast development of the city and also due...
Article
Zaragoza city is located in the central Ebro Basin of the Iberian Peninsula. The Ebro river's fluvial terraces that predominantly consist of sand and gravel represent valuable bulk commodities with a high demand in the rapidly growing metropolitan region of Zaragoza. Due to their good hydraulic conductivity, these deposits act as groundwater bodies...
Article
Forest fires represent a major driver of change at the ecosystem and landscape levels in the Mediterranean region. Environmental features and vegetation are key factors to estimate the ecological vulnerability to fire; defined as the degree to which an ecosystem is susceptible to, and unable to cope with, adverse effects of fire (provided a fire oc...
Article
Although post-fire soil erosion has been studied, little attention has been paid to changes in soil surface cover following fires, despite this being a key factor in understanding the water and sediment yield. This study, at Peñaflor (Spain), investigated the effect of fire on soil erosion using data from soil erosion plots and high spatial resolut...
Article
Full-text available
During the last decades, the average number of fires per year increased significantly. A twofold increase was observed in the Mediterranean Basin, whereas in the western United States, the increase was fourfold. Regional models for burn severity estimation are necessary to avoid time consuming and costly fieldwork at each individual site. Furthermo...
Article
Full-text available
Este trabajo presenta una metodología para determinar las zonas de la provincia de Teruel (España) más adecuadas para la extracción de residuos forestales con fines energéticos respetando los principios de sostenibilidad ecológica de los bosques. Para ello, se modelizan mediante teledetección y SIG los cuatro factores territoriales que intervienen...
Article
La incidencia de los incendios forestales en los ecosistemasmediterráneos, como consecuencia del incremento del número de fuegosy de la superficie quemada, se ha convertido en uno de los problemasambientales de mayor intensidad en las últimas décadas.Alteraciones en los suelos, en la vegetación y en la fauna, en los procesosmorfogenéticos, en los p...
Article
El aprovechamiento energético de la biomasa residual forestalpresenta múltiples beneficios medioambientales y socioeconómicos;sin embargo, la falta de una metodología para estimar la cantidad presentea escala regional es una de las razones que impiden la mayor utilizaciónde este recurso renovable en España. El presente trabajo presentauna metodolog...
Conference Paper
Introduction In northern Mediterranean regions, extensive abandonment of agricultural, cattle and forest activities, together with large-scale afforestation plans, have resulted in an accumulation of flammable fuels over large parts of these landscapes, being one of the major causes of the drastic alteration of fire regimes observed in recent decad...
Article
Full-text available
Synthetic aperture radar (SAR) data at X-, C-, and L-bands have been investigated to determine the relationship between backscatter and forest burn severity over three sites in Spain. The dependence of SAR backscatter on local incidence angle and environmental conditions has been analyzed. At HH and VV polarizations, the backscatter increased with...
Article
Synthetic Aperture Radar (SAR) data has been investigated to determine the relationship between burn severity and interferometric coherence at three sites affected by forest fires in a hilly Mediterranean environment. Repeat-pass SAR images were available from the TerraSAR-X, ERS-1/2, Envisat ASAR and ALOS PALSAR sensors. Coherence was related to m...
Article
This study analysed medium-term degradation in Pinus sylvestris L. woodland affected by wildfire. To investigate recovery, a range of pedological (including thickness of the organic horizon, soil structure and texture, organic matter content, pH and the percentage of carbonates), geomorphological and vegetation parameters were assessed in comparabl...
Article
Full-text available
TerraSAR-X (TSX) dual-polarized synthetic aperture radar (SAR) data from a test site in Spain have been investigated to determine the relationship between forest burn severity and SAR backscatter. The role of the local incidence angle on the backscatter coefficient has been also studied. Burn severity was estimated by means of composition burn inde...
Article
Forest fires play a critical role in landscape transformation, vegetation succession, soil degradation and air quality. Improvements in fire risk estimation are vital to reduce the negative impacts of fire, either by lessen burn severity or intensity through fuel management, or by aiding the natural vegetation recovery using post-fire treatments. T...
Article
Land-use decisions are usually made on the basis of a variety of criteria. While it is common practice to integrate economic, ecological and social (triple bottom line) criteria, explicit geoscientific factors are relatively rarely considered. If a planned land use involves an interaction with the geosphere, geoscientific aspects should be playing...
Chapter
In the Mediterranean context, wildfire has ceased to be a natural ecological factor and has become an anthropic factor of frequent and intense occurrence. Fires cause environmental alterations based the disappearance or modification of the vegetation cover, soil changes and soil hydrogeomorphological behavior. These transformations are mainly conce...
Conference Paper
Full-text available
TerraSAR-X dual-polarized (HH and HV polarization) backscatter data have been investigated to assess the temporal backscatter stability of a burn scar in Spain. Analysis of the main factors influencing burn severity evaluation has been also carried out. The temporal stability of the backscatter was strong, unburned areas showing differences of less...
Article
Remote sensing has been shown to be an efficient tool in the study of forest-fire processes. However, a lack of information on the amount of biomass burnt reduces the accuracy of fire severity and emission models. In this study, we use imagery from the Landsat Thematic Mapper to map crown biomass and burn severity for a large Mediterranean area. Co...
Article
Fire severity can be considered one of the most influential factors in the postfire development of burnt areas. Ground level studies documenting changes in reflectance values improve the discrimination of spatial fire severity across large areas. The objective of this study was to determine those spectral regions most sensitive to fire severity lev...