Record Display for the EPA National Library Catalog
RECORD NUMBER: 71 OF 117Main Title | Observations Related to the Use of the Sigma Coordinate Transformation for Estuarine and Coastal Modeling Studies. | |||||||||||
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Author | Paul, J. F. ; | |||||||||||
CORP Author | Environmental Research Lab., Narragansett, RI. | |||||||||||
Publisher | 1994 | |||||||||||
Year Published | 1994 | |||||||||||
Report Number | EPA/600/A-94/180 ;ERLN-1539; | |||||||||||
Stock Number | PB95-124756 | |||||||||||
Additional Subjects | Estuaries ; Coastal regions ; Environmental effects ; Mathematical models ; Time dependence ; Three-dimensional calculations ; Water quality ; Hydrodynamics ; Ocean circulation ; Ocean bottom ; Topography ; Reprints ; Sigma coordinate transformation model | |||||||||||
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Collation | 18p | |||||||||||
Abstract | One of the common techniques used in application of time-dependent, three-dimensional models addressing estuarine and coastal environmental problems is the sigma coordinate transformation. This transformation has proven useful in applications with highly irregular bottom topography. However, numerous modeling studies have noted difficulties, including spurious density-induced motions and increased velocity fields at depth in variable topography domains. Calculations are presented to illustrate that the common practice of neglecting terms proportional to deltah/deltax and deltah/deltay in the transformed equations can be responsible for spurious velocities. |