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Now showing items 1-20 of 35

    • 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
      Open Access
      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 ...

    • 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
      Open Access
      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)
      Conference lecture
      Open Access
      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
      Open Access
      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
      Open Access
      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
      Open Access
      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 ...

    • 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)
      Conference report
      Open Access
      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
      Open Access
      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 ...

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

      Mujal Colilles, Anna (Universitat Politècnica de Catalunya, 2008-01-22)
      Minor thesis
      Open Access
      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
      Open Access
      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)
      Conference report
      Open Access
      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)
      Conference report
      Open Access
      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)
      Conference report
      Restricted access - publisher's policy
      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)
      Conference report
      Restricted access - publisher's policy
      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)
      Conference report
      Open Access
      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)
      Conference lecture
      Open Access
      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)
      Conference report
      Open Access
      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 ...

    • Numerical simulation of wave interaction with a suspended cylinder using OpenFOAM 

      Wang, Ming; Mujal Colilles, Anna; Molins i Borrell, Climent (Taylor & Francis, 2022)
      Conference report
      Restricted access - publisher's policy
      The objective of the present work is to investigate the hydrodynamic loads of a fixed cylinder subjected to regular waves inside a wave flume using OpenFOAM. The suspended cylinder can be considered as a simplification of ...

    • PIV applications in vortex rings and oscillatory boundary layers 

      Mujal Colilles, Anna (Universitat Politècnica de Catalunya, 2013-05-13)
      Doctoral thesis
      Open Access
      Particle Image Velocimetry (PIV) is one of the most used experimental techniques in fluid mechanics to obtain the velocity field of a flow. One of its most celebrated characteristics is that it does not have interference ...

    • Relationship between eroded volume and main scour hole dimensions near quay walls caused by internal counter-rotating twin-propellers 

      Curulli, Giuseppe; Llull Marroig, Antoni Ignaci; Penna, Nadia; Mujal Colilles, Anna; Gironella Cobos, Xavier; Sánchez Arcilla, Agustín; Gaudio, Roberto (2022-07-14)
      Article
      Open Access
      The present study aims at computing and analysing the eroded sediment volumes induced by twin-propeller jets near a vertical quay wall from the main geometric characteristics of the scour hole. Two different scouring ...