Forum Replies Created
-
AuthorPosts
-
userParticipant
Like what cameron said, you need to connect the 1D river network with the 2D cells by using lateral structure. Its a way to let HEC-RAS know that the flow can be transferred over to the 2D grid.
userParticipantBasically in this format
river reach Station X Y Z
river1 reach1 10 X1 Y1 Z1
river1 reach1 10 X2 Y2 Z2
river1 reach1 10 X3 Y3 Z3userParticipantTry to assign higher Manning’s N value to the buildings in the 2D flow areas.
userParticipantTo run multiple plan.
In HecRAS, under Run menu > Run Multiple Plans
userParticipantyes
userParticipantyes
November 11, 2015 at 10:58 am in reply to: Hydraulic performance of multibarrel culvert under inlet control #9568userParticipantYes. If you want the individual flow for culverts of different sizes , just specify more culvert groups . At the end , you would get the summation of their flows.
November 10, 2015 at 9:40 am in reply to: Hydraulic performance of multibarrel culvert under inlet control #9566userParticipantOne way I can think of is adjusting the ineffective flow area before and after the multiple culverts.
userParticipantI’m also having the same issue in the August version,but you can run the model by going to unsteady flow analysis > Option > Untick data before execution.
userParticipantYou can’t delete all your lateral structure at one time , you will have to manually delete them one by one.
userParticipantMake sure there is no missing values in your flow data. Your flow data must also be sufficiently long enough.
userParticipantYou should define the terrain model to be used for your mesh computations in RAS Mapper. If the background image is not showing in geometry editor , go to view > set schematic plot extends > set to computed extends OR manually set the extends .
userParticipantYour lowest point of your cross section is simply lower than the stage hydrograph. You will have to specify a higher stage value.
userParticipantHave you tried combining the two reaches into one ( use 1 cross section to represent the two reaches) ? As I’m aware , the bridge must be on the same reach to be properly modeled.
June 25, 2015 at 8:00 am in reply to: Calibration of dam break downstream routing + velocity distribution in the cross section #9375userParticipant1. I would personally use high water marks as rating curve is only valid for normal channel flow. Large flows during dam break would require large extrapolations,which isn’t quite accurate.
2. If given a choice , I would rather present the velocity using RAS Mapper for better visualization. In dam break , the channel most likely will be over topped , so the overall velocity in this case would represent the velocity better.
-
AuthorPosts