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Ara es mostren els items 1-20 de 38

    • A new morphodynamic instability associated with cross-shore transport in the nearshore 

      Falqués Serra, Albert; Ribas Prats, Francesca; Mujal Colilles, Anna; Puig i Polo, Càrol (2021-07-16)
      Article
      Accés obert
      The existing theory for shore-transverse rhythmic sand bars relies on morphodynamic instabilities involving the wave-driven longshore current and rip currents. Intriguingly, transverse finger bars are common on coasts with ...

    • A workflow for standardizing the analysis of highly resolved vessel tracking data 

      Mendo, Tania; Mujal Colilles, Anna; Stounberg, Jonathan; Glemarec, Gildas; Mugerza, Estanis; Egekvist, Josefine; Mega Rufino, Marta; Swift, Rene; James, Mark Andrew (2024-01-11)
      Article
      Accés obert
      Knowledge on the spatial and temporal distribution of the activities carried out in the marine environment is key to manage available space optimally. However, frequently, little or no information is available on the ...

    • Alternative manoeuvres to reduce ship scour 

      Castells Sanabra, Marcel·la; Mujal Colilles, Anna; Llull Marroig, Antoni Ignaci; Moncunill Marimon, Jorge; Gironella Cobos, Xavier; Martínez de Osés, Francesc Xavier (Cambridge University Press, 2020-08-03)
      Article
      Accés obert
      Scouring and sedimentation effects on the seabed induced by ship propellers during ship manoeuvring near harbour structures affect both structure stability and ship manoeuvring capabilities. This contribution proposes ...

    • Analysis of vessel induced erosion through manoeuvre simulation and AIS data 

      Llull Marroig, Antoni Ignaci; Moncunill Marimon, Jorge; Castells Sanabra, Marcel·la; Mujal Colilles, Anna; Gironella Cobos, Xavier (Universitat Politècnica de Catalunya. Iniciativa Digital Politècnica, 2022-06-21)
      Comunicació de congrés
      Accés obert
      This manuscript presents an erosion induced by manoeuvring ships assessment methodology in harbour basins with low bed clearance conditions. From the evolution of the bottom morphology, obtained from bathymetric surveys ...

    • Coherent structures in oscillatory flows within the laminar-to-turbulent transition regime for smooth and rough walls 

      Mujal Colilles, Anna; Christensen, Kenneth T.; Bateman Pinzón, Allen; Garcia, Marcelo Horacio (2016-04)
      Article
      Accés obert
      We investigate coherent structures present in oscillatory boundary layers over smooth and rough beds for Reynolds numbers between 103 and 104, in the transition to turbulence regime. A two-camera 2D- particle image velocimetry ...

    • Composite methodology to prevent ship propeller erosion 

      Llull Marroig, Antoni Ignaci; Mujal Colilles, Anna; Castells Sanabra, Marcel·la; Gironella Cobos, Xavier (2020-01)
      Article
      Accés obert
      The jet flow generated by manoeuvring ships nearby vertical structures is known to erode the seabed sediment but is still difficult to predict the effects of a particular ship operating in a harbour basin. This paper ...

    • COVID-19 impact on maritime traffic and corresponding pollutant emissions. The case of the Port of Barcelona 

      Mujal Colilles, Anna; Nieto Guarasa, Javier; Fonollosa Magrinyà, Jordi; Llull Marroig, Antoni Ignaci; Castells Sanabra, Marcel·la (2022-02)
      Article
      Accés obert
      The impact of the SARS-CoV pandemic has gone well beyond health concerns, reaching the maritime industry. The study on the environmental impact of shipping industry during COVID-19 pandemic can provide useful insights to ...

    • Data acquisition differences between two AIS receiving antennas. 

      Mujal Colilles, Anna; Fonollosa Magrinyà, Jordi (2023)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Raw AIS messages are key to interpret the validity of AIS messages used in science for maritime spatial planning purposes. The Barcelona School of Nautical Studies has hosted two AIS antennas, storing raw messages ...

    • Dynamics of the rhythmic morphology on the low-energy Trabucador beach (Ebro delta) 

      Mujal Colilles, Anna; Grifoll Colls, Manel; Ribas Prats, Francesca; Falqués Serra, Albert (Consejo Superior de Investigaciones Científicas (CSIC), 2019)
      Text en actes de congrés
      Accés obert
      Observations of rhythmic morphology along the Trabucador beach are contrasted with two numerical models to unravel the mechanisms of their formation. The Trabucador is a long narrow barrier at the SW side of the Ebro ...

    • Erosion caused by propeller jets in a low energy harbour basin 

      Mujal Colilles, Anna; Gironella Cobos, Xavier; Sánchez-Arcilla Conejo, Agustín; Puig i Polo, Càrol; García León, Manuel (2017-01)
      Article
      Accés obert
      Field data of a harbour basin are compared with analytical formulations for predicting maximum scouring depth due to propeller jets. Spatial data analysis of seven-year biannual bathymetries quantifies the evolution of the ...

    • Estimating fishing effort from highly resolved geospatial data: Focusing on passive gears 

      Mendo, Tania; Glemarec, Gildas; Mendo Aguilar, Jaime Humberto; Hjorleifsson, Einar; Smout, Sophie Caroline; Northridge, Simon; Rodriguez, Julien; Mujal Colilles, Anna; James, Mark Andrew (Elsevier, 2023-08-24)
      Article
      Accés obert
      Increasing competition for marine space requires the appropriate development of indicators to best represent the use of marine areas and the value (whether economic, social and/or cultural) derived from such use. Fishers ...

    • Estudi experimental de l'eficiència de la mescla en dipòsits d'abastament d'aigua 

      Mujal Colilles, Anna (Universitat Politècnica de Catalunya, 2008-01-22)
      Tesina
      Accés obert
      El fenomeno de la mezcla en depósitos de abastecimiento de aguas tiene un efecto directo en la calidad del agua saliente. La creación de zonas de mezcla pobre y la estratificación pueden tener efectos negativos en la ...

    • Estudio del potencial energético de las energías renovables y su impacto en el archipélago de las Perlas (Panamá). Primeras Aproximaciones 

      Castells Sanabra, Marcel·la; Mujal Colilles, Anna; Martínez Parera, Andreu; López, Marilyn (2017-11)
      Article
      Accés obert
      The current situation of the inhabitants of the Las Perlas archipélago highlights the lack of energy resources in this area. The study of the energetic potential of renewable energies and their environmental impacts in the ...

    • Hybrid tool to prevent ship propeller erosion 

      Llull Marroig, Antoni Ignaci; Mujal Colilles, Anna; Castells Sanabra, Marcel·la; Gironella Cobos, Xavier; Martínez de Osés, Francesc Xavier; Martín Mallofré, Agustí; Sánchez-Arcilla Conejo, Agustín (American Society of Mechanical Engineers (ASME), 2018)
      Text en actes de congrés
      Accés obert
      The present contribution aims to implement a new methodology to prevent Roll on-Roll off vessels (RO-RO) from causing severe scouring actions. The methodology combines field, experimental, theoretical and numerical tools ...

    • Low energy transverse sand bars at el Trabucador beach, Ebro delta: a preliminary study 

      Mujal Colilles, Anna; Grifoll Colls, Manel; Falqués Serra, Albert (2017)
      Text en actes de congrés
      Accés obert
      The complex rhythmic morphology of the inner side of the Trabucador barrier beach is investigated. This system fea-tures transverse bars along with shoreline undulations. From visual inspection, the typical spacing between ...

    • Low-cost tracking system to infer fishing activity from small scale fisheries in Scotland 

      Mujal Colilles, Anna; Mendo, Tania; Swift, Rene; James, Mark; Crowe, Swithun; McCann, Patrick (Taylor & Francis, 2022)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Large Scale Fisheries (LSF), with Length Over All (LOA) larger than 12 to 15 m are gener- ally subject to national and international regulations that require they carry some form of tracking system that is capable of ...

    • Maneuvering and operational strategies using AIS data 

      Mujal Colilles, Anna; Bagés Yáñez, Carolina; Fonollosa Magrinyà, Jordi (CRC Press, 2020)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Automatic Identification System (AIS) is a transmitter information system mandatory for ma- rine traffic. Although it was originally designed to help vessels in avoiding collisions, AIS data can be used as a decision-making ...

    • Manoeuvre analysis and simulation to prevent seabed scour due to ship propellers 

      Mujal Colilles, Anna; Castells Sanabra, Marcel·la; Gironella Cobos, Xavier; Llull Marroig, Antoni Ignaci (Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria Nàutiques, 2020-09)
      Text en actes de congrés
      Accés obert
      Erosion of the seabed is produced by cargo and passenger vessels when manoeuvring in a harbour basin due to the high-speed jet flow generated by the main propellers. In case of twin propeller vessels, the ability to perform ...

    • Numerical investigation of nonlinear diffraction wave loads on a suspended cylinder 

      Wang, Ming; Mujal Colilles, Anna; Molins i Borrell, Climent (Universitat Politècnica de Catalunya. Iniciativa Digital Politècnica, 2022-06-21)
      Comunicació de congrés
      Accés obert
      Floating offshore wind turbines (FOWTs) interact with waves in complex sea conditions, inparticular wave-induced nonlinear diffraction wave loads can excite the resonant response of FOWTs in the low frequency range. In ...

    • Numerical modeling of underwater noise induced by shipping traffic in the Balearic Sea 

      Castro Alves Oliveira, Tiago; Fonollosa Magrinyà, Jordi; Mujal Colilles, Anna (2020)
      Text en actes de congrés
      Accés obert
      We present a novel methodology to model theunderwater noise induced by ship traffic in the Balearic Sea. Inthis regard, a three-dimensional underwater sound propagationmodel is used with realistic time-dependent physical ...