Meander Geometry Calculations will provide both curvilinear and Cartesian
coordinates for a meander planform based on the sine-generated
curve.
Riprap Size, Known Velocity and Depth, will calculate riprap size according to
the procedure in EM 1110-2-1601 (USACE 1991, 1994) for
cases when the velocity and depth are given.
Most of the above calculation options have additional options within. These
are briefly described below. The input required to trigger these options will be
discussed in detail in following sections.
In the uniform flow calculations hydraulic parameters can be
calculated by one of four compositing methods: (1) alpha method, (2)
equal velocity method, (3) total force method or (4) conveyance method.
Bed-form roughness prediction may be accounted for by using
Brownlie's method, which uses velocity, hydraulic radius, slope, particle
specific gravity, D50 and the geometric standard deviation of the bed
sediment mixture.
Regime dimensions using the Blench equation can be calculated when
requested with specific input, but this option is not available in SAMwin.
(An editor can be used to alter an input file see Appendix C.) Channel
width, depth and slope are calculated as a function of bed-material grain
size, channel-forming discharge, bed-material sediment concentration,
and bank composition.
Geometry can be simple, as defined by a Channel Template (CT
record), or complex, as prescribed by multiple CT records, or with
station/elevation data, as in X1/GR-record data sets from HEC-2/HEC-6.
In either case the geometry will be transformed into effective hydraulic
parameters for sediment transport calculations.
Riprap can be added to most options.
The installation CD contains an example application, and discussion, in the
LWV folder. This folder is not copied to the CD during installation, so to review
the example application, see the CD.
Program execution
The hydraulic calculations can made in SAMwin by selecting a
calculation type from the "Edit" dropdown menu, inputting the data, and
selecting "solve," or from the "Run" dropdown menu, see Figure 6.1. This
second option is useful if a ready-to-run data set exists.
78
Chapter 6
Input Requirements and Program Output for SAM.hyd
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