Statistical properties of directional ocean waves: the role of the modulational instability in the formation of extreme events M Onorato, T Waseda, A Toffoli, L Cavaleri, O Gramstad, P Janssen, ... Physical Review Letters 102 (11), 114502, 2009 | 206 | 2009 |

Statistical properties of mechanically generated surface gravity waves: a laboratory experiment in a three-dimensional wave basin M Onorato, L Cavaleri, S Fouques, O Gramstad, PAEM Janssen, ... | 166 | 2009 |

Influence of crest and group length on the occurrence of freak waves O Gramstad, K Trulsen Journal of Fluid Mechanics 582, 463, 2007 | 156 | 2007 |

Evolution of weakly nonlinear random directional waves: laboratory experiments and numerical simulations A Toffoli, O Gramstad, K Trulsen, J Monbaliu, E Bitner-Gregersen, ... Journal of Fluid Mechanics 664, 313, 2010 | 116 | 2010 |

Hamiltonian form of the modified nonlinear Schrödinger equation for gravity waves on arbitrary depth O Gramstad, K Trulsen Journal of fluid mechanics 670, 404, 2011 | 52 | 2011 |

Laboratory evidence of freak waves provoked by non-uniform bathymetry K Trulsen, H Zeng, O Gramstad Physics of Fluids 24 (9), 097101, 2012 | 46 | 2012 |

Projected changes in significant wave height toward the end of the 21st century: Northeast A tlantic OJ Aarnes, M Reistad, Ø Breivik, E Bitner‐Gregersen, L Ingolf Eide, ... Journal of Geophysical Research: Oceans 122 (4), 3394-3403, 2017 | 43 | 2017 |

Freak waves in weakly nonlinear unidirectional wave trains over a sloping bottom in shallow water O Gramstad, H Zeng, K Trulsen, GK Pedersen Physics of Fluids 25 (12), 122103, 2013 | 31 | 2013 |

Crossing sea state and rogue wave probability during the P restige accident K Trulsen, JC Nieto Borge, O Gramstad, L Aouf, JM Lefèvre Journal of Geophysical Research: Oceans 120 (10), 7113-7136, 2015 | 28 | 2015 |

Phase-averaged equation for water waves O Gramstad, M Stiassnie Journal of Fluid Mechanics 718, 280, 2013 | 28 | 2013 |

Fourth-order coupled nonlinear Schrödinger equations for gravity waves on deep water O Gramstad, K Trulsen Physics of Fluids 23 (6), 062102, 2011 | 28 | 2011 |

Rogue waves impact on ships and offshore structures EM Bitner-Gregersen, O Gramstad Det Norske Veritas Germanischer Lloyd Strategic Research and Innovation …, 2015 | 27 | 2015 |

Can swell increase the number of freak waves in a wind sea? O Gramstad, K Trulsen Journal of Fluid Mechanics 650, 57, 2010 | 26 | 2010 |

Manifold based optimization for single-cell 3D genome reconstruction J Paulsen, O Gramstad, P Collas PLoS Comput Biol 11 (8), e1004396, 2015 | 24 | 2015 |

Measurement of the dispersion relation for random surface gravity waves TMA Taklo, K Trulsen, O Gramstad, HE Krogstad, A Jensen Cambridge University Press (CUP), 2015 | 22 | 2015 |

Climate change and safe design of ship structures EM Bitner-Gregersen, E Vanem, O Gramstad, T Hørte, OJ Aarnes, ... Ocean Engineering 149, 226-237, 2018 | 16 | 2018 |

Sea-swell interaction as a mechanism for the generation of freak waves A Regev, Y Agnon, M Stiassnie, O Gramstad Physics of fluids 20 (11), 112102, 2008 | 16 | 2008 |

Modulational instability and rogue waves in crossing sea states O Gramstad, E Bitner-Gregersen, K Trulsen, JC Nieto Borge Journal of Physical Oceanography 48 (6), 1317-1331, 2018 | 14 | 2018 |

On Zakharov's kernel and the interaction of non-collinear wavetrains in finite water depth M Stiassnie, O Gramstad Journal of fluid mechanics 639, 433-442, 2009 | 13 | 2009 |

Non-Gaussian properties of second-order wave orbital velocity A Alberello, A Chabchoub, O Gramstad, AV Babanin, A Toffoli Coastal Engineering 110, 42-49, 2016 | 12 | 2016 |