Tuesday, December 6, 2016

Time Series Outflows for Dams

Written by Chris Goodell, P.E., D. WRE | WEST Consultants
Copyright © The RAS Solution 2016. All rights reserved.

Want to simulate a time series of outflows for a dam?  It's easy.  In Version 5.0.3 there's a new feature called Outlet T.S. (Outlet Time Series) in the inline structure editor.  



Click the Outlet TS button and give your new time series a name.  You might name it "Powerhouse" or "Fish Bypass" or something like that.  Once you name it and click OK, it seems like nothing happens.  But what you've done is added the ability for the inline structure to have a flow hydrograph assigned to it in the unsteady flow editor.  

Open up the unsteady flow editor and select the "Add RS..." button.  Then select the inline structure to add it to the list of Boundary Conditions.  Notice in this example, I already have a time series of gate openings assigned to this inline structure.  No matter...just add another boundary condition.  If you click on the empty cell next to the inline structure, you'll see that "Flow Hydrograph" is now an available boundary condition type.


Select the Flow Hydrograph button and now you can enter in a time series of flows for whatever feature you are modeling.  



By the way, this new feature is also available for lateral structures.  

Wednesday, November 23, 2016

Resources for 2D Modeling

Now that we've had 2D modeling in HEC-RAS for almost 2 years, I'm curious to know what your favorite 2D Hydraulic Modeling resources are. Of course, for HEC-RAS modeling, the HEC-RAS 2D Manual is excellent, but what about for a more general discussion of 2D Hydraulic Modeling?  Books?  Journal articles?

I like the Australian Rainfall & Runoff Revision Projects, Project 15:  Two Dimensional Modelling in Urban and Rural Floodplains http://arr.ga.gov.au/revision-projects/project-list/projects/project-15

I also like reading the works of Vincenzo Casulli.  Google him.

If you have a favorite resource for 2D modeling, please share it in the comments section below.


Wednesday, October 19, 2016

Creating Static Results Maps (Shapefiles or Rasters) using RAS Mapper

Written by Mikell Warms  |  WEST Consultants
Copyright © The RAS Solution.  2016.  All rights reserved.
Many readers have been asking how to create shapefiles and other static maps in RAS Mapper. One of the main differences between RAS Mapper in RAS 4.1 and RAS 5.0 is the existence of Dynamic Maps. What makes these maps dynamic is that when you have that Results Layer selected in RAS Mapper, you can use the slider bar (top right) to animate through the simulation and see the results of that layer at each mapping output interval (or each profile for steady flow models). These maps are not saved to the disk, they are temporarily stored in memory.



With this change, you can no longer “Export Layer to Shapefile” as you could previously, due to the fact that these dynamic layers are not one map, they are many maps.

To create static maps, such as shapefiles or rasters, we must first tell RAS Mapper what type of static map we want (Inundation Boundary, Velocity, Shear Stress, etc.) and whether we want the data from a specific timestep, or max/min. To do this, right click on the bold “Results” heading in the Layer Manager in RAS Mapper, then choose “Manage Results Maps”.  All of your plans and default layers will load (like below):


Choose the plan you are interested in, and click on “Add New Map.”

If you’re running a Steady model, the window that pops up will look like this: 

If you’re running an Unsteady model, the window that pops up will look like this: 

Choose the Map Type you are interested in creating; in this case we are creating a maximum Inundation Boundary. Notice we have chosen “Maximum” under the Unsteady Profile options, but we could have chosen “Minimum” or a specific point in time. On the right hand side of the window, make sure to change the Map Output Mode to one of the “Stored (saved to disk)” options, depending on your needs. In this case, we are creating a shapefile polygon. Then click Add Map.

One last step. The Manage Results Maps layer should now look like below:


Notice the static map we have added has appeared. However, the Inundation Boundary map status says “Map Not Created”. You will need to select that map, and click on “Compute/Update Stored Maps” at the top right. If you have multiple static maps, you can select them all by holding the CTRL key and selecting multiple maps prior to computing them.

Once the computations have completed, the status will change to “Map files up to date” and RAS will save your shapefile in your HEC-RAS project folder, in a subfolder that has the same name as the plan from which the shapefiles were created.


Thursday, October 13, 2016

Mississippi River Basin Model Clean-Up Day

For all the HEC-RAS users in the Mississippi area, please consider participating in this service event.  A great opportunity to network with others interested in hydraulic models and to help with the restoration of the historic Mississippi River Basin Physical Model.

Please contact Ms. Sarah McEwan at friendsofMRBM@gmail.com or visit https://www.facebook.com/FriendsofMississippiRiverBasinModel
http://www.friendsofmrbm.org/


Wednesday, October 5, 2016

HEC-RAS Version 5.0.3 has been released!

Version 5.0.3 is now available from the HEC website.  Besides bug fixes, there are a few new or improved features of note:  
  • Culvert Inlet/Outlet Control
  • Using 2D Flow Equations at Lateral Structures
  • Flow and Volume Time Series Output on Profile Lines in RAS Mapper
  • Profile Line Point and Tick Marks
  • Legend for RAS Mapper
  • Improvements to sloping and hybrid map rendering modes
Please read the release notes for more information.

Version 5.0.3 can be downloaded here:




Good luck and enjoy!

Tuesday, October 4, 2016

HEC-RAS 5 2D Course in Barcelona / Curso de Modelación Bidimensional con HEC-RAS 5 en Barcelona

Para los compañeros usuarios de HEC-RAS hispanohablantes, mi colega Marty Teal estará dictando nuestro curso de modelación bidimensional con HEC-RAS 5 en español en Barcelona el 19-21 de octubre, solo queda esta semana para inscribirse.

Vaya aquí para más información.

For my fellow Spanish speaking HEC-RAS Users, my colleague Marty Teal will be teaching our HEC-RAS 5 2D Course in Spanish October 19-21 in Barcelona, Spain. 

Go here for more information.