CMS-Flow Coordinate System: Difference between revisions

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<center>[[File:fig_2_1.bmp]]
<center>[[File:fig_2_1.bmp]]


Figure 2-1. Vertical conventions used for the bed and mean water surface elevation.</center>
 
'''Figure 2-1. Vertical conventions used for the bed and mean water surface elevation.'''</center>

Revision as of 17:09, 11 August 2014

Coordinate System

Before presenting the depth-integrated and wave-averaged governing equations, it is useful to define the coordinate system and basic variables. Variables are defined spatially in a Cartesian coordinate system , where x and y are the horizontal coordinates, and z is the vertical coordinate (positive is upwards). A schematic of several of the main variables in the vertical direction is provided in Figure 2-1. The vertical coordinate datum is usually the Still Water Level (SWL). The bed elevation (zb) is measured from the vertical datum (i.e., negative downwards).

Fig 2 1.bmp


Figure 2-1. Vertical conventions used for the bed and mean water surface elevation.