FLOOD05586

• County: Statewide
• Basin: Statewide
• Title: The Hydrologic Engineering Center Computer Program Abstracts
• Date: 2/1/1980
• Prepared By: US Army Corps of Engineers
• Floodplain - Doc Type: Educational/Technical/Reference Information

ELECTROMIC COMPUTER PROGRAM ABSTRACT

~"E~AI"MG AGENCY The Hydrologic Engineering Center, u. S. Army
60Q , Street Davis Califnrnia 9<;616
u~, K , '''''.~~K'TED
January 1972
Revised March 1976

I'PROG...,.,.. "'0.
723-G2-L2470

Corps of EngineerS;

TITL.E O~ PfllOGJIIAM
Scour and Deposition in Rivers and Reservoirs, HEC-6

AUT 1'40""1

IT AT us 0' flfllOG "AM
"H"'.. T_T AG I:

Init. IOn.
A, PU"~OIE 0' ....00..0,.. The total sediment load is transported along a stream and
changes in the stream's bed elevation and water surface profile with respect to
time are calculated at each cross section considering the following: the
inflowing water discharge, inflowing sediment load, gradation of material in
the stream's bed, armoring and destruction of the armor layer. A series of
reservoirs in tandem can be utilized. A dredging option is available. Diver-
sions of water can be specified and inflowing water and sediment can be
entered at tributary junctions. Clay, silt, sand and gravel sizes are trans-
ported and cobble sizes can be included for armor calculations.
., ~..oo..... ....C"'CAT'ON. The program is dimensioned for up to 150 cross sections,
15 grain sizes, 20 tributary inflow points and 20 reservoirs in tandem.

William A. Thomas

.
c. ..nHOOl Water surface profiles are calculated by the standard step method.
The bed material load is transported by either Toffaleti's application of the
Einstein Bed Load Function, Madden's modification of the Laursen Transport
Relationship or a transport capacity per foot of width versus the depth-slope
product. The silt and clay sizes are transported until the shear stress on
the streambed becomes less than critical. Then deposition begins using fall
velocity as a variable in the exponential decay function. Changes in the bed
elevation are calculated with the Exner equation for continuity of sediment
material.
D. EQUI....E..T DnA,uThe program is written in FORTRAN IV and utilizes about
40,000 words of memory. Three magnetic tape units are required for secondary
storage.

E. ,,,",T-OUT,,UT Card input and printer output.

,. ADDITIONAL ..nA"... This is a one-dimensional solution of the moveable boundary
problem and utilizes a sequence of steady flows to approximate the hydrograph.

DIG 'ORII
, AUG 60

2883

",utYloue .DITION8 AflIa O..OLtl:T&.

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