Civil Engineering Reference
In-Depth Information
HAMSOM uses Era-Interim data and a forcing mix of METRAS and ECMWF
data for meteorological forcing. The mix of meteorological data was necessary
because of the detriment caused by the METRAS model setup; only the atmosphere
over the investigation area of the German Bight was simulated by METRAS. The
atmosphere data over the remaining North Sea area are defined by another, the
ECMWF, data set.
Atmospheric forcing includes 10-m wind fields, surface pressure, 2-m and 10-m
temperature and humidity fields, precipitation, and cloud cover.
Horizontal resolutions of atmospheric fields are 1.5 for Era-Interim and 1 for
ECMWF data, which cause a gridding to HAMSOM ' s horizontal resolution, and
METRAS data have a resolution identical with that of HAMSOM.
Additional data necessary for ocean simulation are oceanic forcing at lateral
open boundaries for ocean simulation, which consists of ocean temperature, salinity
concentration, surface elevation, and river runoff. Thereby, those data are monthly
climatological means based on the climatological ocean data set of World Ocean
Atlas 2001 (WOA-01) by Boyer et al. ( 2005 ) for salinity and temperature. The river
runoff is considered by runoff fluxes of 46 rivers along the North Sea coasts,
gathered by Damm ( 1997 ) and O
Driscoll et al. ( 2012 ).
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3.2.2 Measurements
The BSH supported hydrographical and hydrological measurements around the test
wind park alpha ventus . The cruise aboard VWFS (Vermessungs-, Wracksuch-,
und Forschungsschiff) WEGA allowed the use of Acoustic Doppler Current Pro-
filer (ADCP) and CTD probe (Conductivity, Temperature, Depth probe) within
11th-13th of May 2013. The data set comprises three ADCP stations, which took
measurements over 2 days and 39 + 3 CTD profiles within 1 day. Some impressions
of the WEGA cruise are given in Appendix C.1. An explanation of the CTD probe
and the ADCP instruments is documented in Chap. 9 . Data presentation and
evaluation are placed in Sect. 5.4 .
3.3 Methodology
To analyze the effect of OWFs on the atmosphere and ocean, mainly model data
were consulted. As mentioned, model results were based on METRAS simulations,
which again were used as meteorological forcing for ocean simulation with model
HAMSOM. Various simulations were carried out to investigate on the different
factors triggering the OWF effect on the atmosphere and ocean. To fully capture the
possible effects, the analysis is separated into two main approaches. Hence, the
analysis is based on two types of simulation, shortened to TOS.
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