Now showing items 1-20 of 60

    • Accuracy of methods for field assessment of rill and ephemeral gully erosion 

      Casalí Sarasíbar, Javier Upna; Loizu Maeztu, Javier Upna; Campo Bescós, Miguel Ángel Upna; Santisteban Comino, Luisa María de; Álvarez Mozos, Jesús Upna (Elsevier, 2006)   Artículo / Artikulua  OpenAccess
      To properly assess soil erosion in agricultural areas, it is necessary to determine precisely the volume of ephemeral gullies and rills in the field by using direct measurement procedures. However, little information is ...
    • The added value of stratified topographic correction of multispectral images 

      Sola Torralba, Ion Upna; González Audicana, María Upna; Álvarez Mozos, Jesús Upna (MDPI, 2016)   Artículo / Artikulua  OpenAccess
      Satellite images in mountainous areas are strongly affected by topography. Different studies demonstrated that the results of semi-empirical topographic correction algorithms improved when a stratification of land covers ...
    • Assessing hillslope-channel connectivity in an agricultural catchment using rare-earth oxide tracers and random forests models 

      Masselink, Rens Hein; Temme, A. J. A. M.; Giménez Díaz, Rafael Upna; Casalí Sarasíbar, Javier Upna; Keesstra, S. D. (Universidad de la Rioja, 2017)   Artículo / Artikulua  OpenAccess
      Soil erosion from agricultural areas is a large problem because of off-site effects like the rapid filling of reservoirs. To mitigate the problem of sediments from agricultural areas reaching the channel, reservoirs and ...
    • Assessing soil properties controlling interrill erosion: an empirical approach under Mediterranean conditions 

      Ollobarren del Barrio, Paul; Giménez Díaz, Rafael Upna; Campo-Bescós, Miguel Upna (Wiley, 2017)   Artículo / Artikulua  OpenAccess
      Soil erodibility is a complex phenomenon that comprises a number of different soil properties. However, most current (empirical) erodibility indices are based on only a few soil properties. A feasible soil characterization ...
    • Assessment of soil factors controlling ephemeral gully erosion on agricultural fields 

      Ollobarren Del Barrio, Paul; Campo-Bescós, Miguel Upna; Giménez Díaz, Rafael Upna; Casalí Sarasíbar, Javier Upna (Wiley, 2017)   Artículo / Artikulua  OpenAccess
      The soil factor is crucial in controlling and properly modeling the initiation and development of ephemeral gullies (EGs). Usually, EG initiation has been related to various soil properties (i.e. sealing, critical shear ...
    • Automatic detection of uprooted orchards based on orthophoto texture analysis 

      Ciriza Labiano, Raquel; Sola Torralba, Ion Upna; Albizua, Lourdes; Álvarez Mozos, Jesús Upna; González Audicana, María Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
      Permanent crops, such as olive groves, vineyards and fruit trees, are important in European agriculture because of their spatial and economic relevance. Agricultural geographical databases (AGDBs) are commonly used by ...
    • Ayer y hoy de la estela discoidea en Navarra 

      Ukar Muruzábal, Jesús Upna (Gobierno de Navarra. Institución Príncipe de Viana, 1994)   Artículo / Artikulua  OpenAccess
      El presente trabajo analiza y cataloga las estelas discoideales en Navarra.
    • Bean moisture diffusivity and drying kinetics: a comparison of the liquid diffusion model when taking into account and neglecting grain shrinkage 

      Resende, O.; Correa, P. C.; Jarén Ceballos, Carmen Upna; Moure Gil, José Upna (Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), 2007)   Artículo / Artikulua  OpenAccess
      El objetivo de este trabajo fue ajustar el modelo de difusión líquida para predecir las pérdidas de volumen de grano en el secado de judía (Phaseolus vulgaris L.). Se recolectaron granos de judía con una humedad del 0,92 ...
    • Beyond precipitation: physiographic gradients dictate the relative importance of environmental drivers on savanna vegetation 

      Campo Bescós, Miguel Ángel Upna; Muñoz Carpena, Rafael; Kaplan, David A.; Southworth, Jane; Zhu, Likai; Waylen, Peter (Public Library of Science, 2013)   Artículo / Artikulua  OpenAccess
      Background: Understanding the drivers of large-scale vegetation change is critical to managing landscapes and key to predicting how projected climate and land use changes will affect regional vegetation patterns. This ...
    • Bulk optical of potato flesh in the 500 – 1900 nm range 

      López-Maestresalas, Ainara Upna; Aernouts, Ben; Beers, Robbe van; Arazuri Garín, Silvia Upna; Jarén Ceballos, Carmen Upna; Baerdemaeker, Josse de; Saeys, Wouter (Springer US, 2015)   Artículo / Artikulua  OpenAccess
      In this study, the optical properties of potato flesh tissue were estimated using double-integrating sphere (DIS) measurements combined with an inverse adding-doubling (IAD) light propagation model. Total reflectance, ...
    • Caracterización del modelo HEC-HMS en la cuenca de río Arga en Pamplona y su aplicación a cinco avenidas significativas 

      López Rodríguez, José Javier; González, Miguel; Scaini, Anna; Goñi, Mikel; Valdenebro García, José Vicente; Gimena Ramos, Faustino Upna (Universidad Católica de la Santísima Concepción (Chile), 2012)   Artículo / Artikulua  OpenAccess
      Pamplona es una ciudad que es atravesada por el río Arga a lo largo de una llanura aluvial, que es susceptible de inundaciones cuando se producen avenidas de cierta magnitud. Ante esta situación es importante contar con ...
    • Clasificación de cultivos en la zona media de Navarra mediante imágenes radar polarimétricas 

      Larrañaga, Arantzazu Upna; Albizua, Lourdes; Álvarez Mozos, Jesús Upna (Universidad Politécnica de Valencia, 2010)   Artículo / Artikulua  OpenAccess
      Navarra lleva años empleando la técnica de clasificación supervisada de imágenes multiespectrales de satélite para la realización de la estadística agraria. La cubierta nubosa, muy habitual en esta zona, limita e incluso ...
    • Combined spatial and temporal effects of environmental controls on long-term monthly NDVI in the Southern Africa savanna 

      Campo Bescós, Miguel Ángel Upna; Muñoz Carpena, Rafael; Southworth, Jane; Zhu, Likai; Waylen, Peter; Bunting, Erin (MDPI, 2013)   Artículo / Artikulua  OpenAccess
      Deconstructing the drivers of large-scale vegetation change is critical to predicting and managing projected climate and land use changes that will affect regional vegetation cover in degraded or threated ecosystems. We ...
    • Comparison between capacitive and microstructured optical fiber soil moisture sensors 

      López Aldaba, Aitor Upna; López Torres, Diego Upna; Campo Bescós, Miguel Ángel Upna; López Rodríguez, José Javier; Yerro Lizarazu, David; Elosúa Aguado, César Upna; Arregui San Martín, Francisco Javier Upna; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe; López-Amo Sáinz, Manuel Upna (MDPI, 2018)   Artículo / Artikulua  OpenAccess
      Soil moisture content has always been an important parameter to control because it is a deterministic factor for site-specific irrigation, seeding, transplanting, and compaction detection. In this work, a discrete sensor ...
    • Coupling hysteresis analysis with sediment and hydrological connectivity in three agricultural catchments in Navarre, Spain 

      Keesstra, Saskia D.; Davis, Jason; Masselink, Rens Hein; Casalí Sarasíbar, Javier Upna; Peeters, Edwin T.H.M.; Dijksma, Roel (Springer Verlag, 2019)   Artículo / Artikulua
      Purpose: Rain storm events mobilise large proportions of fine sediments in catchment systems. Sediments from agriculturalcatchments are often adsorbed by nutrients, heavy metals and other (in)organic pollutants that may ...
    • Demonstrating correspondence between decision-support models and dynamics of real-world environmental systems 

      Huffaker, Ray; Muñoz Carpena, Rafael; Campo-Bescós, Miguel Upna; Southworth, Jane (Elsevier, 2016)   Artículo / Artikulua  OpenAccess
      There are increasing calls to audit decision-support models used for environmental policy to ensure that they correspond with the reality facing policy makers. Modelers can establish correspondence by providing empirical ...
    • Desarrollo de productos avanzados para la misión SEOSAT/Ingenio 

      Sabater, N.; Ruiz Verdú, A.; Delegido, J.; Fernández Beltrán, R.; Latorre Carmona, P.; Pla, F.; González Audicana, María Upna; Álvarez Mozos, Jesús Upna; Sola Torralba, Ion Upna; Villa, G.; Tejeiro, J. A.; Miguel, E. de; Jiménez, M.; Molina, S.; Moreno, J. (Universitat Politecnica de Valencia, 2016)   Artículo / Artikulua  OpenAccess
      SEOSAT/Ingenio es la futura misión española de observación de la Tierra en el óptico en alta resolución espacial. Mientras que los productos de imagen a Nivel 1, radiancias geo-referenciadas a nivel de sensor, se encuentran ...
    • Effect of initial step height on headcut development in upland concentrated flows 

      Bennett, S.J.; Casalí Sarasíbar, Javier Upna (American Geophysical UnionWiley, 2001)   Artículo / Artikulua  OpenAccess
      Experiments were conducted to examine the effect of initial step height on growth, development, and upstream migration of headcuts in concentrated flows typical of rills, crop furrows, and ephemeral gullies. In a laboratory ...
    • Effective roughness modelling as a tool for soil moisture retrieval from C-and L-band SAR 

      Lievens, Hans; Verhoest, Niko E. C.; Keyser, E. de; Vernieuwe, Hilde; Matgen, P.; Álvarez Mozos, Jesús Upna; Baets, Bernard de (Copernicus Publications, 2011)   Artículo / Artikulua  OpenAccess
      Soil moisture retrieval from Synthetic Aperture Radar (SAR) using state-of-the-art backscatter models is not fully operational at present, mainly due to difficulties involved in the parameterisation of soil surface ...
    • Effects of spatial sampling interval on roughness parameters and microwave backscatter over agricultural soil surfaces 

      Barber, Matías Ernesto; Grings, Francisco Matías; Álvarez Mozos, Jesús Upna; Piscitelli, Marcela; Perna, Pablo Alejandro; Karszenbaum, Haydee (MDPI, 2016)   Artículo / Artikulua  OpenAccess
      The spatial sampling interval, as related to the ability to digitize a soil profile with a certain number of features per unit length, depends on the profiling technique itself. From a variety of profiling techniques, ...