Glossary of Terms
NOTE: We used EM 1110-2-4000, 15 Dec 89, Appendix B, Sedimentation
Glossary of Terms, and have added other glossary entries for the SED2 manual.
ASCII
The American Standard Code for Information Interchange 8-bit character set. ASCII
values represent letters, digits, special symbols, and other characters.
An ASCII file, or text file, is a file which contains only ASCII characters in the
range from 0 to 127.
Achers-White Transport Equation
The transport formulation for assessing sediment transport for sand adopted for the
SED2D numerical model. The Achers-White formula (see Eq11-13) computes the
total bed load, including suspended load and bed load, and was developed originally
for fine sand. The formulation was later updated to include coarser sands and these
revised coefficients are included in SED2D. See reference Ackers P. and White W.
Sediment Transport: New Approach and Analysis. Journal of the Hydraulics
Division, American Society of Civil Engineers, 1973, 99, HY11 ,2041-2060.
See Also Equations 11-13
Aggradation
The geologic process by which stream beds, flood plains, and the bottoms of other
water bodies are raised in elevation by the deposition of material eroded and
transported from other areas. It is the opposite of degradation.
Alluvial
Pertains to alluvium deposited by a stream of flowing water.
Alluvium
A general term for all detrital deposits resulting directly or indirectly from the
sediment transported of (modern) streams, thus including the sediments laid down in
riverbeds, flood plains, lakes, fans, and estuaries.
Glossary of Terms 151
Users Guide To SED2D-WES
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