Hi!
I'm trying to model riverbed erosion with HEC-RAS with a 1D model. My unsteady flow runs pretty smoothly, but as soon as i add the sediment module, i encounter different errors.
My cross sections are pretty complex, i guess, but that's the way they are (see attached geometry file). I tried different sediment transport functions and layer thicknesses. I get different errors depending on what i'm changing: minimum error exceeds allowable tolerance, unrealistic vertical adjustment, One or more cross section(s) eroded to the bottomof the sediment control volume.
About my model: I want to simulate a period of 10 years and my discharges range from 30 to 350 m³/s. The attached pictures show the grain size distribution and my current settings. I'm using an adaptable time step with a max. Courant number of 3.
I believe that my riverbed erodes too fast, but i cannot change the grain size distributions. Since my experience with HEC-RAS is very limited i'm getting a bit desperate. I already looked at the HEC-RAS page for common runtime errors, but could not really implement the suggestions there. Do you have any ideas what i could change?
I appreciate any feedback!
Thank you
I'm trying to model riverbed erosion with HEC-RAS with a 1D model. My unsteady flow runs pretty smoothly, but as soon as i add the sediment module, i encounter different errors.
My cross sections are pretty complex, i guess, but that's the way they are (see attached geometry file). I tried different sediment transport functions and layer thicknesses. I get different errors depending on what i'm changing: minimum error exceeds allowable tolerance, unrealistic vertical adjustment, One or more cross section(s) eroded to the bottomof the sediment control volume.
About my model: I want to simulate a period of 10 years and my discharges range from 30 to 350 m³/s. The attached pictures show the grain size distribution and my current settings. I'm using an adaptable time step with a max. Courant number of 3.
I believe that my riverbed erodes too fast, but i cannot change the grain size distributions. Since my experience with HEC-RAS is very limited i'm getting a bit desperate. I already looked at the HEC-RAS page for common runtime errors, but could not really implement the suggestions there. Do you have any ideas what i could change?
I appreciate any feedback!
Thank you
