CMS-Flow Bottom Friction: Difference between revisions

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[[image:SMS10p1_CMS-Flow_Model_Control-Cells_Tab.png|thumb|left|500px| Figure 2.1. Specification  of Manning's n coefficient in the ''Cells'' tab of the ''CMS-Flow Model  Control'' window in SMS 10.1]]
[[image:SMS10p1_CMS-Flow_Model_Control-Cells_Tab.png|thumb|left|500px| Figure 2.1. Specification  of Manning's n coefficient in the ''Cells'' tab of the ''CMS-Flow Model  Control'' window in SMS 10.1]]
[[image:CMS-Flow_Model_Control-Input_Tab.png|thumb|none|500px| Figure 2.2 Specification  of the ''Bottom Friction Dataset'' the ''Input'' tab of the ''CMS-Flow  Model Control'' window in SMS 11.1]]
[[image:CMS-Flow_Model_Control-Input_Tab.png|thumb|none|500px| Figure 2.2 Specification  of the ''Bottom Friction Dataset'' the ''Input'' tab of the ''CMS-Flow  Model Control'' window in SMS 11.0]]


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The bottom friction parameter (related to Manning  <math>n</math>) is spatially varying (cell-specific) over  the grid domain.  The default value upon grid creation is 0.025.  At times a user may desire to represent locations where added friction is  needed due to structures or increased turbulence due to sharp changes in  current speed.  More information on using this feature of CMS-Flow can  be found [[CMS-Flow:Bottom_Friction|'''here''']].
The bottom friction parameter (related to Manning  <math>n</math>) is spatially varying (cell-specific) over  the grid domain.  The default value upon grid creation is 0.025.  At times a user may desire to represent locations where added friction is  needed due to structures or increased turbulence due to sharp changes in  current speed.  More information on using this feature of CMS-Flow can  be found [[CMS-Flow:Bottom_Friction|'''here''']].


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[[image:CMS-Flow_Model_Control-Input-Default.png|thumb|left|500px|Figure 2.4. Initialization ofthe ''Bottom Friction Dataset'' in SMS 11.0]]


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| ROUGHNESS_HEIGHT_DATASET ||  CHARACTER CHARACTER || [<grid file>] [<grid  name>//"Datasets/RoughnessHeight"] || none || Grid file name and  dataset path for the input roughness height dataset ||  >=v4.0
| ROUGHNESS_HEIGHT_DATASET ||  CHARACTER CHARACTER || [<grid file>] [<grid  name>//"Datasets/RoughnessHeight"] || none || Grid file name and  dataset path for the input roughness height dataset ||  >=v4.0
|}
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== Editing a Bottom Friction Dataset ==


== Advanced Features==
== Advanced Features==
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! Card !! Arguments !! Default  !! Range !! Description !! Versions
! Card !! Arguments !! Default  !! Range !! Description !! Versions
|-
|-
| MANNING_N_CONSTANT || real number || none || 0.001-0.5 ||  Specifies input Manning n dataset || >=v3.5
| WAVE-CURRENT_MEAN_STRESS || character || W09 || W09  <nowiki>|</nowiki> DATA2 <nowiki>| </nowiki>  DATA13 <nowiki>| </nowiki> F85 <nowiki>|  </nowiki> HT95 || Defines the model used for calculating the mean  bottom shear stress used in hydro || >=4.0
|-
| MANNING_N_CONSTANT || real number || none || 0.001-0.5 ||  Specifies input Manning n dataset || >=v3.5
|-
|-
| WAVE-CURRENT_MEAN_STRESS || character || W09 || W09 <nowiki>|</nowiki> DATA2 <nowiki>| </nowiki>  DATA13 <nowiki>| </nowiki> F85 <nowiki>| </nowiki> HT95 || Defines the model used for calculating the mean bottom shear stress used in hydro || >=4.0
| BOTTOM_FRICTION_COEF_CONSTANT || real number ||   none || 0.001-0.5 ||  Specifies input Manning n dataset || >=v3.5
|-
| ROUGHNESS_HEIGHT_CONSTANT || real number ||   none || 0.001-0.5 ||  Specifies input Manning n dataset || >=v3.5
|}
|}


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[[CMS#Documentation Portal | Documentation Portal]]
[[CMS#Documentation Portal | Documentation Portal]]

Revision as of 18:24, 17 January 2011

Overview

In SMS versions 10.1 and earlier, the bottom roughness is specified using the Manning's n coefficient in the Cells tab of the CMS-Flow Model Control window (see Figure 2.1). In SMS 11.0, the option is provided to use a roughness height, or bottom friction coefficient. The bottom roughness is specified in the Bottom Friction Dataset section of within the Input tab of the CMS-Flow Model Control window (see Figure 2.2). The Bottom Friction Dataset is specified at every computational (ocean) cell and is required for each model simulation.

Figure 2.1. Specification of Manning's n coefficient in the Cells tab of the CMS-Flow Model Control window in SMS 10.1
Figure 2.2 Specification of the Bottom Friction Dataset the Input tab of the CMS-Flow Model Control window in SMS 11.0


Creating a Bottom Friction Dataset

Figure 2.3. Three SMS Project Explorer showing the Manning's n, Bottom Friction Coefficient and Roughness Height datasets.

In SMS 11.0 each time a new CMS-Flow simulation is created a bottom friction (roughness) dataset needs to be created using the Create Dataset button. The bottom friction parameter (related to Manning ) is spatially varying (cell-specific) over the grid domain. The default value upon grid creation is 0.025. At times a user may desire to represent locations where added friction is needed due to structures or increased turbulence due to sharp changes in current speed. More information on using this feature of CMS-Flow can be found here.

Figure 2.4. Initialization ofthe Bottom Friction Dataset in SMS 11.0


Table 1. SMS Cards related to the bottom friction

Card Arguments Default Range Description Versions
USE_WALL_FRICTION CHARACTER ON ON | OFF Turns on or off wall friction >=3.5
MANNING_N_DATASET CHARACTER CHARACTER [<grid file>] [<grid name>//"Datasets/ManningsN"] none Grid file name and dataset path for the input Manning's n dataset >=v3.5
BOTTOM_FRICTION_COEF_DATASET CHARACTER CHARACTER [<grid file>] [<grid name>//"Datasets/BottomFricCoef"] none Grid file name and dataset path for the input bottom friction coefficient dataset >=v4.0
ROUGHNESS_HEIGHT_DATASET CHARACTER CHARACTER [<grid file>] [<grid name>//"Datasets/RoughnessHeight"] none Grid file name and dataset path for the input roughness height dataset >=v4.0

Editing a Bottom Friction Dataset

Advanced Features

Table 2. Advanced Cards related to the bottom friction

Card Arguments Default Range Description Versions
WAVE-CURRENT_MEAN_STRESS character W09 W09 | DATA2 | DATA13 | F85 | HT95 Defines the model used for calculating the mean bottom shear stress used in hydro >=4.0
MANNING_N_CONSTANT real number none 0.001-0.5 Specifies input Manning n dataset >=v3.5
BOTTOM_FRICTION_COEF_CONSTANT real number none 0.001-0.5 Specifies input Manning n dataset >=v3.5
ROUGHNESS_HEIGHT_CONSTANT real number none 0.001-0.5 Specifies input Manning n dataset >=v3.5

Documentation Portal

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