Difference between revisions of "SSW BBL"
(New page: class="title">SSW bottom boundary layer formulation</div> __TOC__ ==Wave-orbital calculations== <wikitex>Near-bed wave-orbital characteristics, including representative orbital velocity $u...) (change visibility) |
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u_{br} = \frac{H_s}{2\sinh (kh)} | u_{br} = \frac{H_s}{2\sinh (kh)} | ||
$$ | $$ | ||
where $kh$ is [[SoulsbyKH | wavenumber] x depth. | where $kh$ is [[SoulsbyKH | wavenumber]] x depth. | ||
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==Ripple Geometry== | ==Ripple Geometry== | ||
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Revision as of 19:03, 3 November 2008
class="title">SSW bottom boundary layer formulation
Wave-orbital calculations
<wikitex>Near-bed wave-orbital characteristics, including representative orbital velocity $u_{br}$, representative period $T_r$, and average direction of wave propagation $\theta_w$ (degrees, nautical convention, which is positive clockwise from north) are defined according to Madsen (1994). When SWAN results are used, these correspond to UBOT, PWAVE, and DWAVE. If surface-wave statistics (e.g., $H_s$, $T_d$, and $\theta_w$) are provide, they can be converted to bottom orbital velocity externally (using, for example, the routines suggested in Wiberg and Sherwood (2008) and provided as UBOT in a SWAN input file. Alternatively, if SSW_CALC_UB is defined, orbital velocity $u_{br}$is calculated according to linear wave theory as follows: $$ u_{br} = \frac{H_s}{2\sinh (kh)} $$ where $kh$ is wavenumber x depth.
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Ripple Geometry
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Bottom Roughness
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Wave-current combined stress and roughness
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Skin friction - form drag partitioning
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Maximum shear stress
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