Extreme skew surge estimation combining systematic skew surges and historical record sea levels on the English Channel and North Sea coasts

Coastal planning implies the estimation of extreme sea levels. As distribution astronomical high tides can be predicted, most recent publications suggest focusing on skew surges. Historical information, record levels observed before beginning systematic tide gauge recordings, improve estimations. The corresponding surges estimated but are not necessarily exhaustive. Indeed, some historical remain unnoticed if they combined with low or moderate tides, for a variety reasons. To deal this exhaustiveness issue, previous publication proposed an unbiased method combining period This appeared more reliable than previously approaches. present study aims at presenting broader evaluation method, based its application to nine sites located English Channel and North Sea coasts. is also improved consider several periods various types information. Results confirm reliable, useful, relevant. A number recommendations formulated selection use information level frequency analyses.