[EN] The seagrass Posidonia oceanica is an important ecosystem endemic in the Mediterranean Sea and for their rightful protection they have been included as priority habitat in the European Union habitats directive. From the priority lines of investigation proposed by the Ministry of Environment, Rural and Marine care for the conversation of the habitat of communal interest 1120*. In regards to the seagrass Posidonia (Posidonion oceanicae) in Spain, in some of the protected marine spaces and managed by the Generalitat Valenciana, the following have been developed: The line "mapping and cataloging of the habitat type 1120*". The line "effect of invading species". The line "Effects of climate change in the priority habitat of seagrass of Posidonia oceanica". The line "Development and validation of state indicators of the conservation, structure and function of the habitat type 1120*". / [ES] Las praderas de Posidonia oceanica son un importante ecosistema endémico del mar mediterráneo y para su protección ha sido incluido como hábitat prioritario en la Directiva de Hábitats de la Unión Europea. De las líneas prioritarias de investigación propuestas por el Ministerio de Medio Ambiente, y Medio Rural y Marino, para la conservación del hábitat de interés comunitario 1120* Praderas de Posidonia (Posidonion oceanicae) en España, en algunos de los espacios marinos protegido creados y gestionado por la Generalitat Valenciana, se han desarrollado las siguientes: La línea "Cartografiado y catalogación del tipo de hábitat 1120*". La línea "Efecto de las especies invasoras". La línea "Efectos del cambio climático en el hábitat prioritario praderas de Posidonia oceanica". La línea "Desarrollo y validación de indicadores de estado de conservación, estructura y función del tipo de hábitat 1120*" . / [CA] Els herbers de Posidonia oceanica són un important ecosistema endèmic del mar mediterrani i per a la seua protecció ha sigut inclòs com a hàbitat prioritari en la Directiva d'Hàbitats de la Unió Europea. De les línies prioritàries d'investigació proposades per el Ministeri de Medi Ambient , i Medi Rural i Marí, per a la conservació de l'hàbitat d'interés comunitari 1120* Herbers de Posidonia (Posidonion oceanicae) a Espanya, en alguns dels espais marins protegit creats i gestionat per la Generalitat Valenciana, s'han desenrotllat les següents: La línia "Cartografiat i catalogació del tipus d'hàbitat 1120*". La línia "Efecte de les espècies invasores". La línia "Efectes del canvi climàtic en l'hàbitat prioritari herbers de Posidonia oceanica". La línia "Desenrotllament i validació d'indicadors d'estat de conservació, estructura i funció del tipus d'hàbitat 1120*". / Enguix Egea, A. (2016). Desarrollo de lineas prioritarias de investigación del hábitat de interés comunitario 1120* Praderas de Posidonia (Posidonion oceanicae) en espacios marinos protegidos de la Comunidad Valenciana [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/63242

Intra-archipelago waterways, including tidal strait networks, present a complex set of barriers to, and conduits for sediment transport between marine basins. Tidal straits may also be the least well understood tide-dominated sedimentary environment. To address these issues, currents, sediment transport pathways, and seabed sedimentology & geomorphology were studied in the central Salish Sea (Gulf and San Juan Islands region) of British Columbia, Canada and Washington State, USA. A variety of data types were integrated: 3D & 2D tidal models, multibeam bathymetry & backscatter, seabed video, grab samples, cores and seismic reflection. This dissertation included the first regional sediment transport modelling study of the central Salish Sea. Lagrangian particle dispersal simulations were driven by 2D tidal hydrodynamics (~59-days). It was found that flood-tide dominance through narrow intra-archipelago connecting straits resulted in the transfer of sediment into the inland Strait of Georgia, an apparent sediment sink. The formative/maintenance processes at a variety of seabed landforms, including a banner bank with giant dunes, were explained with modelled tides and sediment transport. Deglacial history and modern lateral sedimentological and morphological transitions were also considered. Based on this modern environment, adjustments to the tidal strait facies model were identified. In addition, erosion and deposition patterns across the banner bank (dune complex) were monitored with 8-repeat multibeam sonar surveys (~10 years). With these data, spatially variable bathymetric change detection techniques were explored: A) a cell-by-cell probabilistic depth uncertainty-based threshold (t-test); and B) coherent clusters of change pixels identified with the local Moran's Ii spatial autocorrelation statistic. Uncertainty about volumetric change is a considerable challenge in seabed change research, compared to terrestrial studies. Consideration of volumetric change confidence intervals tempers interpretations and communicates metadata. Techniques A & B may both be used to restrict volumetric change calculations in area, to exclude low relative bathymetric change signal areas. / Graduate / 2018-12-07