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Available pressure charts from the UK Met Office provide a validation of the data set used as seen in Figure 1 below.įigure 1 – Met office and NOAA/NCEP reanalysis data used as forcing conditions for the model. The NOAA/NCEP reanalysis data is 6 hourly at a spatial resolution of 2.5 degrees. This data set can provide driving wind fields and pressures for the entire globe and a temporal and spatial subset was utilized for this demonstration. For this the NOAA/NCEP reanalysis data was used. In addition the driving forces of the storm in the North East Atlantic needed to be represented. Tidal data was obtained from the MIKE 21 toolbox to allow the flow model to be adequately resolved.
#Hydrodynamic models mike 21 sea level software#
The coupled model developed makes use of the Spectral Wave and Hydrodynamic modules of the MIKE by DHI software and uses freely available data sources as inputs.įor this regionally focused modeling study, bathymetry data has been sourced from the GEBCO 08 Grid bathymetry data set which provides a 30 arc-second grid of the entire globe.
#Hydrodynamic models mike 21 sea level series#
With this in mind, DHI have developed a demonstration model of this event to show how the Flexible Mesh series of models allows you to take large scale North East Atlantic basin driving forces to understand the impact at a local scale. With increasing emphasis from operating authorities being placed on beach management of such natural defences, it is important to understand the driving conditions in an event such as this to plan effective management. Greenwood (1984) noted that reflective beaches, which are already prone to sub-harmonic edge waves, can interact with longer period swell waves leading to an amplification of wave run up, a mechanism which leads to higher than anticipated overtopping and overwashing of the crest with consequent implications for barrier stability and hinterland flooding. It is important to note that many of the beaches along the south coast are gravel/shingle dominated barriers which are typically considered reflective in morphological classifications (Short 1979). Whilst this is not unusual in itself (beaches along the south coast have historically been subject to similar storms), the combination with high water of these small wave height, long period waves led to a series of flooding “near misses” along the South Coast as swell waves led to damage and overtopping of some defences including natural barrier beaches.
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In February this year (2011) a large storm in the North Atlantic caused swell waves with periods of 20-25 seconds to propagate into the English Channel. The RMAE and IoAd analysis revealed that model validation was found to be “excellent” for water level and “very good” for current.Example MIKE 21 Coupled Model to investigate swell wave propagation in the English Channel The relative mean absolute error (RMAE) and index of agreement (IoAd) were also computed for both seasons. The correlation was 0.89 and 0.99 for surface elevation and 0.56 and 0.73 for current speed. The model results of water level and current were compared with field observations for both seasons and found to be satisfactory. A two-dimensional hydrodynamic model was also set up and validated with the field data successfully. The average current was 17 cm/s N during SW monsoon and 10 cm/s S during NE monsoon. The data analysis revealed that tides were semidiurnal in nature and that the ratio of diurnal (O 1, K 1) and semidiurnal (M 2, S 2) constituents was 0.19 and 0.24 for the two respective seasons. To this end, time series oceanographic data on tide, current, and wind were collected for 15 days each during SW monsoon and NE monsoon seasons. The present study is aimed at characterizing the hydrodynamic regime of Chennai coastal waters through field investigations and numerical modelling. Hydrodynamic modelling of Chennai coast from a coastal zone management perspective.Ī thorough knowledge of hydrodynamic conditions of coastal waters is a primary requirement for understanding and resolving environmental management issues. Mohan, R., and Venkatachalapathy, R., 2013.