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Aranguren Erice, Itxaso

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https://academica-e.unavarra.es/handle/2454/48563

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Aranguren Erice

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Itxaso

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Ingeniería

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0009-0000-5253-1426

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1175209

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812270

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2020 - 20212
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    PublicationOpen Access
    Relleno de huecos en series temporales de índices Sentinel-2 en cubiertas agrícolas con datos procedentes de Sentinel-1
    (2021) Aranguren Erice, Itxaso; Álvarez-Mozos, Jesús; Escuela Técnica Superior de Ingeniería Agronómica y Biociencias; Nekazaritzako Ingeniaritzako eta Biozientzietako Goi Mailako Eskola Teknikoa
    La teledetección ofrece la posibilidad de realizar un seguimiento del desarrollo de los cultivos mediante la adquisición de imágenes de forma repetida por sensores alojados en plataformas satelitales. El objetivo del presente trabajo fin de master es rellenar la falta de información en las series temporales de índices Sentinel-2 (sensor óptico-multiespectral) causadas por las nubes, con datos procedentes de Sentinel-1 (sensor radar cuya funcionalidad no se ve limitada por la nubosidad). Para ello, se calcularon y evaluaron índices ópticos y radar que ofrecieran una mayor sensibilidad al desarrollo de siete cultivos representativos de una zona de estudio en Navarra. Posteriormente, se realizó un análisis estadístico y evaluó la correlación entre los índices calculados. Finalmente, se estudiaron y evaluaron las técnicas de relleno aplicadas. Los resultados muestran que podría ser factible rellenar la falta de información en series temporales de NDVI a través de datos de índices de Sentinel-1.
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    PublicationOpen Access
    Assessment of the main factors affecting the dynamics of nutrients in two rainfed cereal watersheds
    (Elsevier, 2020) Hernández García, Iker; Merchán Elena, Daniel; Aranguren Erice, Itxaso; Casalí Sarasíbar, Javier; Giménez Díaz, Rafael; Campo-Bescós, Miguel; Valle de Lersundi, Jokin del; Ingeniaritza; Institute on Innovation and Sustainable Development in Food Chain - ISFOOD; Ingeniería
    Nutrient dynamics and factors that control nutrient exports were observed in two watersheds, namely Latxaga and La Tejería, with similar climatic and management characteristics throughout 10 years (2007–2016). Similar patterns were observed in intra-annual and inter-annual dynamics with higher NO3 − concentration and NO3 −-N yield during the humid seasons (i.e., winters and hydrological year 2013). Regarding concentration, Latxaga showed a higher decrease of nitrate due to a higher development of vegetated areas. High discharge events produced nitrate dilution due to the presence of tile-drainage at La Tejeria. At Latxaga, where tile-drainage was not observed, an increase in concentration occurred as a response to high discharge events. Comparing both watersheds, La Tejería presented ca. 73 ± 25 mg NO3 − L−1 while at Latxaga, the concentration observed was almost three times lower, with ca. 21 ± 15 mg NO3 − L−1 throughout the study period. Similar patterns were observed for the NO3 −-N yield, with 32 kg NO3 −-N ha−1 year−1 and 17 kg NO3 −-N ha−1 year−1 at La Tejería and Latxaga, respectively. Regarding phosphorous, the observed concentrations were 0.20 ± 0.72 mg PO4 3− L−1 and 0.06 ± 0.38 mg PO4 3− L−1 at La Tejería and Latxaga, respectively, with PO4 3−-P yields being 71 kg PO4 3−-P ha−1 year−1 and 33 kg PO4 3−-P ha−1 year−1. Annual phosphate-P yield distribution in both watersheds followed similar patterns to those observed for the nitrate-N yield, with higher yields in the humid season. Regarding concentration, highly erosive rainfall that occurred in summer, mobilizing sediments and probably generating desorption of phosphorous in the stream channel, increased phosphate concentration. This research adds to the knowledge base regarding the dynamics of nutrients and the controlling factors in complex agricultural systems with Mediterranean characteristics.