Now showing items 1-20 of 72

    • A field test of a linear stability model for crescentic bars 

      Tiessen, M.C.H.; Leeuwen, S.M.Van; Calvete Manrique, Daniel; Dodd, Nicholas (2010-01)
      Article
      Restricted access - publisher's policy
      A morphodynamical linear stability analysis is used to predict the natural development of crescentic bed patterns and rip channels. The purpose is to investigate whether this technique, which is useful for understanding ...
    • A mechanism for sandbar straightening by oblique wave incidence 

      Garnier, Roland; Falqués Serra, Albert; Calvete Manrique, Daniel; Thiebot, Jerome; Ribas Prats, Francesca (2013-06-06)
      Article
      Open Access
      Breaker bars in the surf zone of sandy beaches generally evolve between straight bars parallel to the shore and meandering crescentic bars associated with intense (dangerous) currents flowing seaward through rip channels. ...
    • A mechanism inhibiting rip channel formation for oblique waves 

      Garnier, Roland; Dodd, Nicholas; Falqués Serra, Albert; Calvete Manrique, Daniel (World Scientific Publishing Company, 2009)
      Conference lecture
      Restricted access - publisher's policy
      Previous numerical modelling studies based on 2DH morphodynamical model show that oblique waves tend to inhibit the formation of rip channel systems, but the mechanisms were not investigated. Field observations do not ...
    • A model for grain-size sorting over tidal sand ridges 

      Walgreen, M; de Swart, Huib E.; Calvete Manrique, Daniel (2004-07)
      Article
      Restricted access - publisher's policy
      A model was developed and analyzed to quantify the effect of graded sediment on the formation of tidal sand ridges. Field data reveal coarse (fine) sediment at the crests (in the troughs), but often phase shifts between ...
    • A model for sand ridges on the shelf: effect of tidal and steady currents 

      Calvete Manrique, Daniel; Walgreen, M.; Swart, Huib E. de; Falqués Serra, Albert (2001-05)
      Article
      Open Access
      The dynamics of sand ridges, as observed on the innershelves and midshelves of various coastal seas, are investigated within the framework of an idealized model. These seabed undulations include shoreface-connected sand ...
    • A new instability mechanism related to high-angle waves 

      Falqués Serra, Albert; Kakeh Burgada, Nabil; Calvete Manrique, Daniel (2018-06-27)
      Article
      Open Access
      Waves with a large incidence angle in deep water can drive a morphodynamic instability on a sandy coast whereby shoreline sand waves, cuspate forelands, and spits can emerge. This instability is related to bathymetric ...
    • A new shoreline instability mechanism related to high-angle waves 

      Kakeh Burgada, Nabil; Falqués Serra, Albert; Calvete Manrique, Daniel (2017)
      Conference lecture
      Open Access
      The alongshore wave driven sediment transport can render a rectilinear coastline unstable in case of very oblique wave incidence.
    • A new shoreline instability mechanism related to high-angle waves 

      Falqués Serra, Albert; Kakeh Burgada, Nabil; Calvete Manrique, Daniel (2017)
      Conference report
      Open Access
      A new shoreline instability triggered by high-angle waves and leading to sand wave formation is investigated. In contrast with the well-known high angle wave instability, which involves both the surf and shoaling zones and ...
    • A nonlinear model study on the long-term behaviour of shore face-connected sand ridges 

      Calvete Manrique, Daniel; Swart, Huib E. de (2003-05)
      Article
      Open Access
      A morphodynamic model is analyzed to gain further knowledge about the finite amplitude behavior of shore face–connected sand ridges observed on storm-dominated inner shelves. The present work elaborates on previous studies ...
    • An idealised study for the long term evolution of crescentic bars 

      Chen, W.L.; Dodd, Nicholas; Tiessen, M.C.H.; Calvete Manrique, Daniel (2018-01-01)
      Article
      Open Access
      © 2017 Elsevier Ltd. An idealised study that identifies the mechanisms in the long term evolution of crescentic bar systems in nature is presented. Growth to finite amplitude (i.e., equilibration, sometimes referred to as ...
    • Camera calibration for coastal monitoring using available snapshot images 

      Simarro, Gonzalo; Calvete Manrique, Daniel; Souto, Paola; Guillén Aranda, Jorge (Multidisciplinary Digital Publishing Institute (MDPI), 2020-06-06)
      Article
      Open Access
      Joint intrinsic and extrinsic calibration from a single snapshot is a common requirement in coastal monitoring practice. This work analyzes the influence of different aspects, such as the distribution of Ground Control ...
    • Comparison of modelled nearshore transverse sandbars with field observations 

      Ribas Prats, Francesca; Calvete Manrique, Daniel; Falqués Serra, Albert (2010)
      Conference report
      Open Access
    • Dynamics of shoreface-connected and inactive sand ridges on a shelf, Part 2: The role of sea level rise and associated changes in shelf geometry 

      Nnafie, Abdel; de Swart, Huib E.; Calvete Manrique, Daniel; Garnier, Roland Charles (2015-08)
      Article
      Open Access
      Many inner continental shelves are characterized by the presence of large rhythmic bedforms, such as shoreface-connected ridges and the more offshore located sand ridges, which have heights of several meters and are spaced ...
    • Effect of depth-dependent wave stirring on the final amplitude of shoreface-connected sand ridges 

      Calvete Manrique, Daniel; Swart, Huib E. de; Falqués Serra, Albert (2002-12)
      Article
      Restricted access - publisher's policy
      A nonlinear morphodynamic model is analysed to gain fundamental knowledge about the initial growth and long-term behaviour of observed shoreface-connected sand ridges. Themodel describes quasi-steady, depth-averaged flow ...
    • Effect of grain size sorting on the formation of shoreface-connected sand ridges 

      Walgreen, M; Deswart, H E; Calvete Manrique, Daniel (2003-03)
      Article
      Open Access
      Field data of shoreface-connected ridges show persistent spatial variations of mean grain size over the bed forms. In the shore-normal direction, the profiles of bottom topography and mean grain size are approximately 90° ...
    • Effect of surface rollers on the formation crescentic bars 

      Calvete Manrique, Daniel; Ribas Prats, Francesca; de Swart, Huib E.; Falqués Serra, Albert (2011)
      Conference lecture
      Restricted access - publisher's policy
      The effect of surface rollers on the formation of crescentic bars/rip channel systems is examined with a morphodynamic model. A linear stability analysis is applied to find the fastest growing bottom patterns that develop ...
    • Effect of surface rollers on the formation of crescentic bars: large angles of incidence 

      Calvete Manrique, Daniel; Ribas Prats, Francesca; Swart, Huib E. de; Falqués Serra, Albert (2012)
      Conference lecture
      Open Access
      The formation of crescentic bars is examined using a morphodynamic model based in linear stability analysis. The effect of surface rollers for off-normal wave conditions is examined. The effect of the rollers is to increase ...
    • Effect of wave-bedform feedbacks on the formation of, and grain sorting over shoreface-connected sand ridges 

      Vis-Star, Nicolette C.; Swart, Huib E. de; Calvete Manrique, Daniel (2009-11)
      Article
      Restricted access - publisher's policy
      The influence of wave–bedform feedbacks on both the initial formation of shoreface-connected sand ridges (sfcr) and on grain size sorting over these ridges on micro-tidal inner shelves is studied. Also, the effect of ...
    • Effect of wave-topography interactions on the formation of sand ridges on the shelf 

      Vis-Star, Nicolette C.; Swart, Huib E. de; Calvete Manrique, Daniel (2007-06)
      Article
      Open Access
      The role of wave-topography interactions in the formation of sand ridges on microtidal inner shelves is investigated with an idealized morphodynamic model. The latter uses the two-dimensional shallow water equations to ...
    • Effects of sea level rise on the formation and drowning of shoreface-connected sand ridges, a model study 

      Nnafie, Abdel; Swart, Huib E. de; Calvete Manrique, Daniel; Garnier, Roland (2014-06-01)
      Article
      Restricted access - publisher's policy
      Shoreface-connected sand ridges occur on many storm-dominated inner shelves. These rhythmic features have an along-shelf spacing of 2-10 km, a height of 1-12 m, they evolve on timescales of centuries and they migrate several ...