WMS:Defining Roughness: Difference between revisions

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Roughness values are determined for cross sections based on a set of material properties defined for the cross sections. Material properties are defined in a four step process.
Roughness values are determined for cross sections based on a set of material properties defined for the cross sections. Material properties are defined in a four step process.


#Create a master set of materials (land use) types that define the possible choices to be found in the floodplain you are modeling. Typically you will want to define as many materials as you will be defining manning's roughness values. This is done using the '''Materials''' command in the ''SMPDBK'' menu.
#Create a master set of materials (land use) types that define the possible choices to be found in the floodplain being modeled. Typically, define as many materials as there will be defined manning's roughness values. This is done using the '''Materials''' command in the ''SMPDBK'' menu.
#:[[Image:WMSImage154.png|350 px]]
#:[[Image:WMSMaterialsData.png|350 px]]
#Create an Area Property Coverage that consists of polygons corresponding to the different land use (roughness) types found in the floodplain. After building the coverage you will need to define each polygon attribute by double-clicking on the polygon and assigning the appropriate roughness value. Generally these polygons will be a more generalized version of a land use map.
#Create an Area Property Coverage that consists of polygons corresponding to the different land use (roughness) types found in the floodplain. After building the coverage, define each polygon attribute by double-clicking on the polygon and assigning the appropriate roughness value. Generally these polygons will be a more generalized version of a land use map.
#:[[Image:WMSImage155.png|300 px]]
#:[[Image:SMPDBK2.png|300 px]]
#Define the manning's roughness values that correspond to each material property. This dialog is accessed from the ''SMPDBK'' menu using the '''Material Properties''' command.
#Define the manning's roughness values that correspond to each material property. This dialog is accessed from the ''SMPDBK'' menu using the '''Material Properties''' command.
#:[[Image:image156.jpg|150 px]]
#:[[File:WMS HEC RAS MP.png|150 px]]
#Assign the created materials properties to the cross section database being used. This will make sure that properties mapped to the cross sections when cut from a digital terrain model have a roughness value assigned. This is done using the '''Model Control''' option in the ''SMPDBK'' menu.
#Assign the created materials properties to the cross section database being used. This will make sure that properties mapped to the cross sections when cut from a digital terrain model have a roughness value assigned. This is done using the '''Model Control''' option in the ''SMPDBK'' menu.
#:[[Image:image157.jpg|180 px]]
#:[[Image:HEC-RES MC.png|180 px]]


When WMS writes the SMPDBK input file, average roughness values are computed based on the conveyance for the elevation/top-width increment.
When WMS writes the SMPDBK input file, average roughness values are computed based on the conveyance for the elevation/top-width increment.
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{{WMSMain}}
{{WMSMain}}
[[Category:SMPDBK|D]]
[[Category:SMPDBK|D]]
[[Category:WMS Dialogs|Defining]]
[[Category:SMPDBK Dialogs]]

Latest revision as of 20:30, 8 June 2023

Roughness values are determined for cross sections based on a set of material properties defined for the cross sections. Material properties are defined in a four step process.

  1. Create a master set of materials (land use) types that define the possible choices to be found in the floodplain being modeled. Typically, define as many materials as there will be defined manning's roughness values. This is done using the Materials command in the SMPDBK menu.
    WMSMaterialsData.png
  2. Create an Area Property Coverage that consists of polygons corresponding to the different land use (roughness) types found in the floodplain. After building the coverage, define each polygon attribute by double-clicking on the polygon and assigning the appropriate roughness value. Generally these polygons will be a more generalized version of a land use map.
    SMPDBK2.png
  3. Define the manning's roughness values that correspond to each material property. This dialog is accessed from the SMPDBK menu using the Material Properties command.
    WMS HEC RAS MP.png
  4. Assign the created materials properties to the cross section database being used. This will make sure that properties mapped to the cross sections when cut from a digital terrain model have a roughness value assigned. This is done using the Model Control option in the SMPDBK menu.
    HEC-RES MC.png

When WMS writes the SMPDBK input file, average roughness values are computed based on the conveyance for the elevation/top-width increment.


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