The RAS Solution


Just noticed that HEC-RAS Version 4.1 is credited away in about 1 week. I thought I’d take this opportunity to post the Version 4.1 Release Notes to give you all a sneak maximum of what’s to come. Check the HEC website in the next week or so for the state software release. Version 4.1 of the River Analysis System (HEC-RAS) is currently available.

This version supersedes version 4.0, which was released in March of 2008 to the general public, and all earlier versions. Several new simulation features have been put into the scheduled program after that. Other minor enhancements were also added. The development team has also continuing careful and systematic testing of the planned program since the last release.

The results of this testing in combination with reports from users has allowed the recognition and repair of various problems. Some small problems that did not have an effect on results but caused problems in this program interface have been fixed without having to be specifically documented. This new release is installed separately of any previous versions of the program.

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Users may have the new version and previous versions of HEC-RAS software installed simultaneously for parallel use or assessment. This new version is fully compatible with projects developed in virtually any earlier version of the planned program. However, a task has been opened in Version 4 once.1 and saved, it might not be possible to open it with a mature version of the software and reproduce the old results. The brand new installation package is designed to be simple to use.

It will take you through the steps of choosing the directory for this program data files and making other settings. 1. Download the installation deal from the HEC website to a temporary folder using the pc. If the program was provided for you on the CD-ROM or other media, insert it in the correct drive.

Run the set up program. In Windows Explorer, double-click the icon for the installation program. You must have administrator privileges to run the installer. Follow the on-screen prompts to install the scheduled program. This program allows the user to define portions of a model to be routed with a hydrologic routing technique rather than using the entire unsteady flow equations.

The software will concurrently solve the unsteady circulation equations and the hydrologic routing gets to each time step. This program is very helpful when encountering servings of the model that are extremely steep, and full unsteady stream routing is either unpredictable or extremely hard at all. The only hydrologic routing method available is Modified Puls routing. This option only works as part of an unsteady flow model, and it is ignored when utilizing a geometry file in steady flow mode. For details about how to use the Hydrologic Routing Option in a Unsteady flow setting, please review Chapter 6 of the User’s Manual.

The Unsteady Flow Data Editor was modified to be more flexible, as well as add the ability to attach more than one inflow hydrograph to a storage space. The Boundary conditions Tab, and how boundary conditions locations are established has changed. For details on how to use the new Unsteady Flow Boundary Conditions editor, please review the section on Flow Data in Chapter 8 of the User’s Manual. Generally, development and contraction loss are not found in unsteady flow, and the default coefficients are 0 therefore.0. Pushes due to expansions and contractions are handled in the momentum equation through pressure pressure variations.

However, because HEC-RAS is a one-dimensional unsteady movement model, the one-dimensional momentum formula will not always capture all of the forces functioning on the movement field at a razor-sharp contraction and/or growth zone. To be able to better approximate the potent makes functioning on the water, and the resulting water surface elevation, at a contraction and/or expansion, the user can enter empirical contraction and enlargement coefficients for unsteady movement modeling.

These coefficients will be multiplied by a big change in velocity mind, like in stable circulation modeling just, but the ensuing energy loss gets converted to an equivalent force for placement into the momentum equation. For details on how to use the contraction and expansion losses option for unsteady flow modeling in HEC-RAS, please review Chapter 6 of the User’s Manual. Minor losses due to bends, junctions, etc… can be put into both the regular circulation and the unsteady movement solution.