IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
Log On
About IAHRDirectoryCommitteesMy IAHRNews & JournalseLibraryeShopEventsJoin IAHRWorld CongressDonate
spacer.gif
spacer.gif eLibrary
spacer.gif eLibrary
You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Extreme events, natural variability and climate change : Evolution of surge levels and tide/surge interactions inside the seine bay
Evolution of surge levels and tide/surge interactions inside the seine bay
Author : EVOLUTION OF SURGE LEVELS AND TIDE/SURGE INTERACTIONS INSIDE THE SEINE BAY
ABSTRACT
Within the Technical Commission for the Study and the Evaluation of Maritime Submersions in the Seine Estuary
(CteeSMES), whose aim is to improve the collective knowledge on physical processes related to maritime surge levels, a
numerical model of the Atlantic French Coast based on TELEMAC2D was used to study the evolution of surge levels
from the ocean to the harbour area of Le Havre and to evaluate the interactions between tide and surge levels in the
Seine Bay.
The numerical model was specifically calibrated on JOHANNA and XYNTHIA storm events, which respectively occurred
in March 2008 and in February 2010. To calibrate the global signal (tide + surge levels), measurements available on
seven outputs of the Atlantic coast were used to optimize the coefficient for wind influence and for bottom friction.
Maritime boundary conditions were provided by the North East Atlantic Atlas (LEGOS). Winds and pressure fields were
CFSR data.
Once the numerical model had been calibrated both for tide and surge levels, it as been possible to draw the evolution of
surge levels from the ocean to Le Havre (quai Meunier) and then to compare the signal obtained at each point of the
Seine Bay with that obtained without taking into consideration tide for each event. That also allowed us to evaluate the
contribution of interactions between tide and surge levels inside of the Seine Bay for Xynthia and Johanna events, but
also for other events in the slice [1979-2010].
To improve the knowledge about tide/interactions on the French Atlantic Coast and specifically in the Seine Bay, data
analysis and modeling approaches with a numerical model of storm surges in the Seine Bay were used. A preliminary
data analysis based on 15 years at several harbours' locations highlighted that the largest instantaneous storm surges
occur preferentially at low and rising tide at Le Havre. That is why, to better quantify tide/surge dependence, specific
numerical computations with the shallow-water model TELEMAC2D were carried out for two events: Johanna and
Xynthia. The existence of strong interactions explained by strong tidal currents and shallow water depths in the Seine Bay
were put in evidence. Finally, skew surges were also studied for Xynthia event, but further investigations must be done on
other events or spring tides to conclude about the necessity to take into account the dependency in extreme water level
analyzes in the Seine Bay.
File Size : 4,603,820 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Extreme events, natural variability and climate change
Date Published : 28/08/2015
Download Now