caa a22 4500 605546541 CHVBK 20210128100941.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s10236-015-0852-8 doi (NATIONALLICENCE)springer-10.1007/s10236-015-0852-8 Modeling of turbulent dissipation and its validation in periodically stratified region in the Liverpool Bay and in the North Sea [Elektronische Daten] [Kaushik Sasmal, Subhendu Maity, Hari Warrior] The present work explores the applicability of an alternative eddy viscosity formulation in numerical models dealing with the dynamics of the coastal ocean. The formulation is based on the Reynolds stress anisotropy-anisotropy being an important tool for capturing turbulent mixing. Initially idealized entrainment scenarios are evaluated that are typical for shelf seas viz. entrainment in linearly stratified and two-layer fluids caused by surface wind stress or barotropic pressure gradient-driven bottom stress. An attempt is made to simulate the realistic semi-diurnal cycle of turbulent dissipation in Liverpool Bay Region of Freshwater Inflow (ROFI) in the Irish Sea characterized by strong horizontal gradients and interactions with tidal flow. Turbulent dissipation cycles with a 25-h period using free-falling light yo-yo (FLY) dissipation profiler exhibits a strong asymmetry between ebb and flood. The above dynamics involving tidal straining during the ebb and mixing during the flood has been simulated using k- ε $$ \varepsilon $$ and the alternative formulated turbulence scheme in a one-dimensional (1-D) dynamic model. The model is forced with observed tidal flow and horizontal gradients of temperature and salinity. Simulated dissipation cycles show good agreement with observation. The present work also involves a comparison of dissipation rate measurements in northern North Sea using the abovementioned turbulence schemes—the measurements being taken using free-falling shear probes and CTD (conductivity, temperature, and depth) sensors. The main forcing provided for the upper and bottom boundary layers are atmospheric forcing and tides, respectively. To compare the observations and model results, quantitative error measurements have also been studied which reveal the applicability of the alternative turbulence scheme. Springer-Verlag Berlin Heidelberg, 2015 Dissipation nationallicence Tidal straining nationallicence Turbulence modeling nationallicence Turbulence mixing nationallicence Stratification nationallicence Sasmal Kaushik Department of Ocean Engineering and Naval Architecture, Indian Institute of Technology Kharagpur, 721302, Kharagpur, India aut Maity Subhendu Department of Mechanical Engineering, National Institute of Technology Meghalaya, 793003, Shillong, India aut Warrior Hari Department of Ocean Engineering and Naval Architecture, Indian Institute of Technology Kharagpur, 721302, Kharagpur, India aut Ocean Dynamics Springer Berlin Heidelberg 65/7(2015-07-01), 969-988 1616-7341 65:7<969 2015 65 10236 https://doi.org/10.1007/s10236-015-0852-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10236-015-0852-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sasmal Kaushik Department of Ocean Engineering and Naval Architecture, Indian Institute of Technology Kharagpur, 721302, Kharagpur, India aut NATIONALLICENCE 700 1- Maity Subhendu Department of Mechanical Engineering, National Institute of Technology Meghalaya, 793003, Shillong, India aut NATIONALLICENCE 700 1- Warrior Hari Department of Ocean Engineering and Naval Architecture, Indian Institute of Technology Kharagpur, 721302, Kharagpur, India aut NATIONALLICENCE 773 0- Ocean Dynamics Springer Berlin Heidelberg 65/7(2015-07-01), 969-988 1616-7341 65:7<969 2015 65 10236