Welcome to the RAS Solution › Forums › HEC-RAS Help › Sediment results – grading curve

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  • May 23, 2015 at 7:37 pm #5806
    Anonymous
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    Hey, greetings!

    I’m working with Hec-Ras 4.1 and already simulating the sediment changing at one river site. My question is, that how could I get the changed bed gradiation curve after the simulation? I see, that I can set up the output level of the sediment modeling, but the grading curve isn’t involved.

    May 24, 2015 at 7:24 pm #9330
    Anonymous
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    RAS is designed to produce minimal output by default to keep the output files small. To make the sediment transport output available for the graphic displays and tabulation the output variables need to be selected (under Sediment Transport Analysis > Options> Sediment Output Options choose an output level 6 to get the info. by grain size.) Execute the simulation. Then, from the main RAS window, choose Options>View>Sediment Spatial Plot. This leads you to a menu of what output is available and when. Under “variables” you will find a list of items available for plotting or tabulating, including instantaneous loads and contents of the various bed sediment sources (cover layer, subsurface, etc.) by grain size fraction. These values are available in both plots and tables. The traditional “percent-finer” plot for size gradation is not directly available, but can be constructed from the detailed tables provided.

    May 24, 2015 at 11:37 pm #9331
    Anonymous
    Guest

    “The traditional “percent-finer” plot for size gradation is not directly available, but can be constructed from the detailed tables provided.”

    Yeah, thank you, that is the method, what I’m looking for, and couldn’t figure it out, how.

    May 25, 2015 at 4:29 pm #9332
    Anonymous
    Guest

    Finally got it, it was in front of my eyes, just couldn’t see somehow…

    So, you can get the gradiation curve for each cross-section, by using within the sediment spatial plot table the Cover layer (ALL then 1-21) in tons, for the actual time. It will give you the weights per fractions, therefore you can construct the curve.

    But you have to know, that this results (Cover layers) as an output is exist just with the choice of Exner 5 sorting method (sediment options), and with Output level 6 (sediment output options within the sediment simulating window).

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