Listar DAgr-Artículos, capítulos... por autor "908bb26c-2fa9-4aa8-9d9a-5a0c02f8e37d"
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Analysis of snow spatial and temporary variability through the study of terrestrial photography in the Trevelez river valley
Pérez Palazón, Mª José; Pimentel, Rafael; Herrero, Javier; Polo, María José (SPIE, 2014)The spatiotemporal evolution of the snow cover may help to obtain conclusions on the variability of the atmospheric agents in high mountain areas. That evolution is difficult to analyze due to the heterogeneity of the snow ... -
Characterizing snow dynamics in semi-arid mountain regions with multitemporal sentinel-1 imagery: a case study in the Sierra Nevada, Spain
Torralbo, Pedro; Pimentel, Rafael; Polo, María José; Notarnicola, Claudia (MDPI, 2023)Monitoring snowmelt dynamics in mountains is crucial to understand water releases downstream. Sentinel-1 (S-1) synthetic-aperture radar (SAR) has become one of the most widely used techniques to achieve this aim due to its ... -
Climate Trends Impact on the Snowfall Regime in Mediterranean Mountain Areas: Future Scenario Assessment in Sierra Nevada (Spain)
Pérez Palazón, Mª José; Pimentel, Rafael; Polo Gómez, María José (MDPI, 2018)Snow constitutes a key component of the water cycle, which is directly affected by changes in climate. Mountainous regions, especially those located in semiarid environments, are highly vulnerable to shifts from snowfall ... -
Combining remote sensing and terrestrial photography in a snowmelt modeling framework to retrieve snow evolution in a semiarid region
Polo, María José; Herrero, Javier; Pimentel, Rafael; Pérez Palazón, Mª José; Gilabert, A.; Torralbo, Pedro (IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018)This work shows the strength of combining different data sources and modelling to generate long time map series of snow variables in Sierra Nevada (Spain), an alpine environment within a semiarid region in which the snowpack ... -
Comparison between Snow Albedo Obtained from Landsat TM, ETM+ Imagery and the SPOT VEGETATION Albedo Product in a Mediterranean Mountainous Site
Pimentel, Rafael; Aguilar Porro, Cristina; Pérez Palazón, Mª José; Polo Gómez, María José; Herrero Lantarón, Javier (MDPI, 2016)Albedo plays an important role in snow evolution modeling quantifying the amount of solar radiation absorbed and reflected by the snowpack, especially in mid-latitude regions with semiarid conditions. Satellite remote ... -
Estimating snow albedo patterns in a Mediterranean site from Landsat TM and ETM+ images
Pimentel, Rafael; Herrero, Javier; Polo, María José (SPIE, 2013)The albedo of snow affects the shortwave radiative flux at the land-atmosphere interface, so that it therefore plays an important role in the snow mass and energy balance. In semiarid areas, their particular climate ... -
Extreme values of snow-related variables in Mediterranean regions: trends and long-term forecasting in Sierra Nevada (Spain)
Pérez Palazón, Mª José; Pimentel, Rafael; Herrero, Javier; Aguilar, Carmen; Perales, J.M.; Polo, María José (International Association of Hydrological Sciences, 2015)Mountain areas in Mediterranean regions constitute key monitoring points for climate variability and its impacts, but long time datasets are not always available due to the difficult access to high areas, relevant ... -
Impact of Satellite and in Situ Data Assimilation on Hydrological Predictions
Musuuza, Jude Lubega; Gustafsson, David; Pimentel, Rafael; Crochemore, Louise; Pechlivanidis, Ilias (MDPI, 2020)The assimilation of different satellite and in situ products generally improves the hydrological model predictive skill. Most studies have focused on assimilating a single product at a time with the ensemble size subjectively ... -
Quantifying Snow Cover Distribution in Semiarid Regions Combining Satellite and Terrestrial Imagery
Herrero Lantarón, Javier; Polo Gómez, María José; Pimentel, Rafael (MDPI, 2017)Mediterranean mountainous regions constitute a climate change hotspot where snow plays a crucial role in water resources. The characteristic snow-patched distribution over these areas makes spatial resolution the limiting ... -
Snow evolution in a semi-arid mountainous area combining snow modelling and Landsat spectral mixture analysis
Pimentel, Rafael; Herrero, Javier; Polo, María José (Copernicus, 2015)This study proposes the use of both physically-distributed hydrological modelling in combination with satellite remote sensing images, to study the evolution of the snowpack in the Sierra Nevada mountains, in southern ... -
Study of snow dynamics at subgrid scale in semiarid environments combining terrestrial photography and data assimilation techniques
Pimentel, Rafael; Herrero, Javier; Zeng, Yijian; Su, Zhongbo; Polo, María José (American Meteorology Society, 2015)Snow cover simulation is a complex task in mountain regions because of its highly irregular distribution. GIS-based calculations of snowmelt–accumulation models must deal with nonnegligible scale effects below cell size, ... -
Subgrid parameterization of snow distribution at a Mediterranean site using terrestrial photography
Pimentel, Rafael; Herrero, Javier; Polo, María José (EGU, 2017)Subgrid variability introduces non-negligible scale effects on the grid-based representation of snow. This heterogeneity is even more evident in semiarid regions, where the high variability of the climate produces various ... -
Terrestrial photography as an alternative to satellite images to study snow cover evolution at hillslope scale
Pimentel, Rafael; Herrero, Javier; Polo Gómez, María José (SPIE, 2012)In Mediterranean regions, where the water shortage is a serious and recurrent problem, it is essential to know the behaviour and evolution of the snow. Satellite remote sensing is widely used to find out the evolution of ... -
Validating improved-MODIS products from spectral mixture-Landsat snow cover maps in a mountain region in southern Spain
Pimentel, Rafael; Marín, Carlo; De Gregorio, Ludovica; Callegari, Mattia; Pérez Palazón, Mª José; Notarnicola, Claudia; Polo, María José (International Association of Hydrological Sciences, 2018)Remote sensing is the only feasible data source for distributed modelling of snow in mountain regions on medium to large scales, due to the limited access to these areas together with the lack of dense ground monitoring ... -
Which Potential Evapotranspiration Formula to Use in Hydrological Modeling World-Wide?
Pimentel, Rafael; Arheimer, R.; Crochemore, Louise; Andersson, J. C. M.; Pechlivanidis, Ilias; Gustafsson, David (Wiley, 2023)Although many potential evapotranspiration (PET) formulas are available, there is still a lack of knowledge on when and where to use them in catchment modeling world-wide. Here we experimented with three different formulas ...