Modeling Programs
GSTARS
2.1 Sediment Transport Computer Model
GSTARS 2.1 is a numerical model developed by the
US Bureau of Reclamation for Hydraulics and Sediment
Transport simulating alluvial rivers with movable
boundaries. It is a steady state model based on a
one-dimensional backwater algorithm that can compute
mixed regime flows (sub critical, supercritical, or
any combination of the two). Sediment transport
capabilities include: fractional transport, bed
sorting and armoring, over 10 sediment transport
functions for sizes ranging from clay to gravel,
non-equilibrium transport, computation of channel
width changes, etc. The model can be used as a
one-dimensional model, as a semi-two-dimensional
model by the use of stream tubes, or simulates
changes is channel geometry in a semi-three
dimensional manner. Through the use of stream tubes
within an essentially one-dimensional backwater
model, the intense data and computational
requirements of more sophisticated two- and
three-dimensional models are eliminated with results
that are consistent with more sophisticated modeling
approaches. The hydraulics computations are based on
the standard step method. Both the momentum and the
energy equations are used, allowing the computation
of subcritical, supercritical, and both flow regimes
simultaneously, including the simulation of flow
with hydraulic jumps. The user interacts with the
model via an interactive graphical user interface.
1102-001 GSTARS 2.1
Package 2.5 lbs.
BrEase 3.2 Bridge Scour and
Stream Stability Computer Program
BrEase is a tool intended to provide a
consistent, time-efficient means for monitoring
stream stability, estimation of hydraulic parameters
and calculation of potential pier scour. BrEase is
currently being used by Caltrans and the Oregon DOT
for their scour critical evaluation programs and to
estimate basic hydraulic parameters needed to
perform scour analysis. The program automates the
time-consuming process of drawing bridge diagrams
and can be used to maintain accurate records of
stream cross-sections at bridges. BrEase was
developed using Microsoft Excel and incorporates
over 6600 lines of Visual Basic Code. The program is
designed to be easy to use and employs a Custom Menu
Bar, on-screen Buttons and over 40 dialog input
boxes to simplify the input process. The program is
designed to be used in the field for quick
validation of field measurements and in the office
for hydraulic and maintenance studies. BrEase can
save engineers a substantial amount of time and
provide them with critical information for various
engineering studies. Some of the benefits of using
the program are listed below.
-
¥
Accurately draws the bridge substructure and
superstructure accounting for up to 2 vertical
curves, varying cross slopes, and variable
structural depths for arch type structures.
- ¥ Automatically calculates terrain elevation
from simple cross section field measurements. This
information is invaluable for determining the
amount of ground cover over footings for scour
critical determinations.
- ¥ Plots up to 10 channel cross-sections with
varying line styles and markers to allow the
engineer to quickly see historic degradation or
migration of the stream.
- ¥ Easily estimates and plots the normal depth
of an irregular channel.
- ¥ Approximates the velocity distribution of
flow.
- ¥ Simultaneously determines the potential pier
scour depths at a bridge for various scour
conditions including migration of the thalweg and
complex pier scour.
1102-005 BrEase 3.2
Package 2 lbs.
TR-20 Hydrologic Analysis Model
The TR-20 Hydrologic Analysis Modeling Program
was developed by the NRCS (Soil Conservation
Service) to assist in hydrologic evaluation of flood
events for use in analysis of water resources
projects. It is a physically-based event model which
computes runoff resulting from any synthetic or
natural rainstorm. Uses the widely accepted SCS
curve number for rainfall to direct runoff
calculations and runoff hydrograghs using the SCS
unit hydrograph method. The program package includes
a comprehensive users guide with sample
applications.
1102-010 TR-20
Package 3 lbs.
HEC-1 Flood Hydrograph Model
The HEC-1 was developed by the U.S. Army Corps of
Engineers and is designed to simulate the surface
runoff response of a river basin to precipitation by
representing the basin as an interconnected system
of hydrologic and hydraulic components. The program
features hydrologic analysis including unit
hydrograph development, loss rate methods, flood
routing in reservoirs and rivers. It includes
development of design storms and flood flows under
modified conditions. The design and analysis of
urban storm water detention basins are included.
1102-012 HEC-1
Package 3 lbs.
HEC-2 Flood Hydraulics Model
The HEC-2 was developed by the U.S. Army Corps of
Engineers for water surface profiles and features
open channel flow energy concepts, gradually varied
flow theory, and backwater analysis methods. The
hydraulics package includes normal and special
bridge methods, floodway determination and channel
improvements. Water surface profiles include channel
and overbank changes, flow through bridges, special
modeling problems, floodway determination, and
channel design.
1102-021 HEC-2
Package 3 lbs.
WMS-Watershed Modeling System
The Watershed Modeling System (WMS) is a
comprehensive modeling environment for hydrologic
analysis. WMS provides tools for all phases of
watershed modeling including automated watershed and
sub basin delineation, geometric parameter
computation, hydrologic parameter computation (CN,
time of concentration, rainfall depth, etc.) and
result visualization. WMS merges information
obtained from terrain models and GIS with industry
standard lumped parameter hydrologic analysis models
such as HEC-1 and TR-20.
Terrain models can obtain geometric attributes
such as area, slope and run off area. Many display
options are provided to aid in modeling and
understanding the drainage characteristics of
terrain surfaces.
The distinguishing difference between WMS and
other applications designed for setting up
hydrologic models like HEC-1 and TR-20 is its unique
ability to take advantage of digital terrain for
hydrologic data development. WMS uses GIS, DEM, and
TIN data sources for model development.
1102-014 WMS-Watershed
Modeling System 3 lbs.
USGS Graphical Constituent
Loading Analysis System (GCLAS)
The U.S. Geological Survey has developed a
program called GCLAS (Graphical Constituent Loading
Analysis System) to aid in the computation of daily
constituent loads transported in stream flow. GCLAS
provides a visual environment for evaluating the
relation between hydraulic and other covariate time
series and the constituent chemograph. GCLAS
replaces the computer program Sedcalc, which is the
most recent USGS sanctioned tool for constructing
sediment chemographs and computing
suspended-sediment loads. Written in a portable
language, GCLAS has an interactive graphical
interface that permits easy entry of estimated
values and provides new tools to aid in making those
estimates. The use of portable language for program
development imparts a degree of computer platform
independence that was difficult to obtain in the
past, making implementation more straightforward
within the USGS's diverse computing environment.
Some of the improvements introduced in GCLAS include
(1) the ability to directly handle periods of zero
or reverse flow, (2) the ability to analyze and
apply coefficient adjustments to concentrations as a
function of time, streamflow, or both, (3) the
ability to compute discharges of constituents other
than suspended sediment, (4) the ability to easily
view data related to the chemograph at different
levels of detail, and (5) the ability to readily
display covariate time series data to provide
enhanced visual cues for drawing the constituent
chemograph.
1102-015 GCLAS
2 lbs.
Top
