User Forum of Software BASEMENT

Matteo Facchini

Developer

From: Trento

Registered: 2014-09-05

Posts: 286

No Layer defined

In BASEMENT v 4.1.0 the Item description for SOILDEF reads

"A soil consists of one or several layers. For single grain size simulations,
one layer is needed (usually with the only mixture assigned to it) to define the fixed bed by its bottom elevation.
If no LAYER block is defined within a SOIL_DEF, a fixed bed without layer on top is assumed at this place."

My understading is that I can do something like

              {
                "LAYER": [],
                "name": "fix"
              }

or

              {
                "name": "fix"
              }

However, this raises an error, and to solve this one has to do something like

              {
                "LAYER": [
                  {
                    "mixture_name": "single",
                    "z_rel": 0.0
                  }
                ],
                "name": "fix"
              }

Is this a wanted behavior, or a bug?

Matthias Bürgler

Developer

From: Zürich

Registered: 2019-04-04

Posts: 175

Re: No Layer defined

Hi Matteo,

Unfortunately, the description in the GUI is wrong. The third example shows the intended behaviour. To summarize:

For a soil with a fixed bed:

              {
                "name": "fixed_bed",
                "LAYER": [
                  {
                    "mixture_name": "single",
                    "z_rel": 0.0
                  }
                ]
              }

For a soil with a fixed bed below the current bed elevation:

              {
                "name": "limited_erodible_bed",
                "LAYER": [
                  {
                    "mixture_name": "single",
                    "z_rel": -2.0
                  }
                ]
              }

For an infinitely erodible soil without fixed bed horizon:

              {
                "name": "erodible_bed",
                "LAYER": [
                  {
                    "mixture_name": "single",
                    "z_rel": -999.0
                  }
                ]
              }

Best regards,
Matthias