Analysis 02: OWF Effect on the Ocean - On the Effect of Offshore Wind Farms on the Atmosphere and Ocean Dynamics - page 76

a

b c d

e f g

Fig. 5.17 Overview of maximal OWF effect on the ocean after 1 day of OWF operation along
cross-section S-N in comparison with sensitivity runs regarding the horizontal exchange. Y -axis
gives the change of the variables (a) surface elevation, (b) velocity component u ,(c) velocity
component v ,(d) velocity component w ,(e) temperature, (f) salinity, and (g) density. X -axis
comprises simulations of sensitivity study src.*: 50 denotes ' normal run ' ; 61 is run without
horizontal exchange of momentum, advection, and diffusion; 53 ignores horizontal diffusion;
55 ignores horizontal advection; 57 avoids horizontal advection and diffusion; and 58 is no use of
Smagorinsky (HAMSOM parameter horcon ¼ 0)

Therefore, the negligence of Smagorinsky diffusion leads to a stronger wake and
hence stronger changes in the velocity components in src58, compared to normal
run (Fig. 5.17 ). Changes in the horizontal velocity field again affect the vertical
eddy viscosity coefficient A vc , which impacts the vertical velocity component and
the hydrographic variables.
The reduction of the hydrographic conditions in the case of no horizontal TS
diffusion (src53) shows that the horizontal diffusion intensifies the gradients in the
density field and thereby impacts velocity field and surface

elevation.