The Sea Hazard Group in the EGU Natural Hazards Division has grown significantly and consists of 5 different sessions in the 2011 EGU General Assembly:

- NH5.1 New developments in tsunami science and in mitigation of tsunami risk, including early warning;
- NH5.2 Extreme sea waves;
- NH5.3 Nonlinear dynamics of the coastal zone;
- NH5.4 Coastal flooding and erosion risk: present and future;
- NH5.5 Storm surges and coastal areas: extreme events, damages, and risk.

We propose publishing of the NHESS special issue \"Sea Hazards\" collecting the best contributions presented in EGU 2011 under NH5 Group. Participation in this special issue will be by invitation only. We expect 20-30 papers, which will be selected during EGU General Assembly in Vienna. All Guest Editors are conveners of the NH5 sessions.