Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Observations Related to the Use of the Sigma Coordinate Transformation for Estuarine and Coastal Modeling Studies.
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
Library Call Number Additional Info Location Last
NTIS  PB95-124756 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 03/06/1995
Collation 18p
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.