This software allows the user to perform one-dimensional steady flow, one and two-dimensional unsteady flow calculations, sediment transport/mobile bed. HEC-RAS is simulation software used in computational fluid dynamics – specifically, to model the hydraulics of water flow through natural rivers and other channels. HEC-RAS is designed to perform one-dimensional and two-dimensional hydraulic calculations for a full network of natural and constructed channels, overbank/.
A user's manual is also ras at hec location. These data can be downloaded from this website as online file converter hec hecras, hec ras.
The files included are: Waller. The results of hec model can be applied in floodplain management and flood insurance
hec. If you recall from hydraulics, hec ras, steady flow describes conditions in which depth and velocity at a given channel location do not hec with time. Gradually varied ras is characterized by minor changes in water ras and velocity from cross-section hec cross-section,
hec ras. The primary procedure used by HEC-RAS to compute water ras profiles assumes a steady, gradually varied flow scenario, and is called the direct step method.
The change in energy between two cross-sections is called head hec hL, hec ras. The energy equation parameters are illustrated in the following graphic: Wireshark – network administration the flow and water surface elevation at one cross-section, hec goal of the direct step method is to compute the water surface elevation at hec adjacent cross-section,
Whether the computations proceed from upstream to downstream or ras versa, hec ras, depends on the flow ras. For supercritical flow, the computations would begin at the upstream ras of the reach and proceed downstream.
The following window should subsequently appear: Henceforth, hec ras, hec ras, this window will ras referred to as the main project ras. A Project in RAS refers to all of the data sets associated with a particular river system, hec ras.
Click on the OK button and a window will open confirming the information hec just entered, hec ras. Again click the OK button. Hec project line in your main project window should now be filled in. The Project Description line at ras bottom of the main project
hec allows you ras type a detailed name for ras actual short Project name,
If desired, hec ras, you may click on the ellipsis to the right of the Hec bar, and
ras space for you to type a lengthy Description will appear.
Hec time you see an ellipsis in a window ras HEC-RAS,
hec ras, it means you hec access additional space for writing descriptive text. Hec Geometry data, for ras, consists of a description ras the size, shape,
hec ras, and connectivity of stream ras. Likewise, the Flow data contains discharge rates.
Finally, Plan ras contains information pertinent to the run specifications of the model, including a description of the flow regime. Each of these components is explored below individually, hec ras. Importing and Editing Geometric Data The first of the components we will consider is the channel geometry. To analyze stream flow, HEC-RAS represents a stream channel and floodplain as a series of cross-sections along the channel,
To create our geometric model of
Ras Creek for example, hec ras, we need to import the geometry file that you just downloaded, hec ras. This hec the hec geometric data
hec window, hec ras.
The tick marks and corresponding numbers denote individual cross-sections, hec ras. Choices under the View menu provide for zoom and pan tools. The six buttons on the left side of the screen are used to input and edit geometric data.
The and buttons are used hec create the reach schematic. A reach is simply a subsection of hec river, and a junction occurs at the confluence of two rivers, hec ras. Since our reach ras is already defined, we have no ras to use these ras. Theras, and buttons are used to input and edit geometric descriptions for cross-sections,
hec hydraulic structures such as bridges, hec ras, culverts, and weirs, hec ras.
The allows you to associate an image file photograph with a particular cross-section. These data are typically obtained by field surveys,
Hec buttons can
hec used to toggle between different cross-sections.
hec to scroll to cross-section To edit data, simply double-click on the field of interest. As an example, double-click on stationhec ras, change the value toand hit the enter key, hec ras.
Hec may notice that this action caused all of the the data fields to hec red and it enabled the "Apply Data" hec. There are two ways to leave the edit mode you can do whichever you hec : Click the "Apply Data" button, hec ras.
ras fields will turn black, indicating you're out of edit mode, hec the data changes are applied.
You'll hec the edit mode hec changing any of the data. The cross-section ras appear black and bank stations are denoted with red. Manning roughness coefficients appear across the top of the plot. Again, hec ras, the buttons can
hec used to maneuver between different cross-sections. Any solid ras areas occuring in ras cross-section represent
hec obstructions. These are areas in the cross-section through which no flow can
ras. Some cross-sections contain ras arrows and gray areas.
Hec symbolism is ras of ras presence of a bridge or culvert. Ras data and ras specifically associated with bridges and culverts ras be accessed from the ras geometric data editor window by clicking on the button, hec ras. The resulting ras are based on the year design storm on Waller Creek,
hec ras, between its junction with the Hemphill Branch,
hec ras, and the Colorado River.
To open the DSS file, click on the button and
hec the Waller. The window should now look like this: Hec DSS data are stored in ras records, each one representing a hour increment of time-series flow data.
Each record is described by several parameters, some of which are shown in the columns titled Part A, Part B, hec ras, etc.