Difference between revisions of "TUFLOW Message 3519"

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(Created page with "{{TUFLOW_Message |tuflow_message=ERROR 3519: Using MIN or GULLY option in SGS model. |alt_msg=NA |type=ERROR |message_desc=If the DEM is fine enough, SGS can preserve the...")
 
 
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{{TUFLOW_Message
 
{{TUFLOW_Message
|tuflow_message=ERROR 3519: Using MIN or GULLY option in SGS model.
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|tuflow_message=CHECK 3519: Using MIN or GULLY option in SGS model.
 
|alt_msg=NA
 
|alt_msg=NA
|type=[[ERROR]]  
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|type=[[CHECK]]
|message_desc=If the DEM is fine enough, SGS can preserve the gully along the cells without using any gully line. in such case using a gully line may overestimate the width of the flow path as it make the entire cell and face flat.
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|message_desc=If the DEM's resolution is fine enough, SGS can preserve the flow path along the cells/faces without using any gully line. By default, a gully line applies a gradient along the faces based on the cell corners and
|suggestions=Check if "SGS Sample Distance" and resolution of the DEM is fine enough to capture the gully line without using topography modification.
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cell side Zpt values, and creates sloping cells using the ZC, ZU, ZV and ZH values. It does insure a continuous flow path, but the spatial accuracy may become lower comparing to the approach of sampling elevation directly from DEM. For more discussion, please see <u>[[Quadtree_and_Sub-Grid_Sampling_FAQ#Why_shouldn.27t_I_use_Z_Shape_gully.2Fmin_lines_with_SGS_models.3F|SGS FAQ page]]</u>.
|discussion_page=* [[Talk:TUFLOW Message 3519|Discuss Message 3519]]
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|suggestions=Check if "SGS Sample Distance" and resolution of the DEM is fine enough to capture the gully line. If so, the topography modification MIN or GULLY option can be removed.
|link3=''
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|link4=''
 
|prelink=[[TUFLOW_Message_3517|Message 3517]]
 
 
|uplink=[[3xxx_TUFLOW_Messages|3xxx Messages]]
 
|uplink=[[3xxx_TUFLOW_Messages|3xxx Messages]]
|nextlink=[[TUFLOW_Message_3522|Message 3522]]
 
 
}}
 
}}

Latest revision as of 10:26, 3 March 2023

TUFLOW Message
CHECK 3519: Using MIN or GULLY option in SGS model.

Alternate Message
NA

Message Type
CHECK

Description
If the DEM's resolution is fine enough, SGS can preserve the flow path along the cells/faces without using any gully line. By default, a gully line applies a gradient along the faces based on the cell corners and cell side Zpt values, and creates sloping cells using the ZC, ZU, ZV and ZH values. It does insure a continuous flow path, but the spatial accuracy may become lower comparing to the approach of sampling elevation directly from DEM. For more discussion, please see SGS FAQ page.

Suggestions
Check if "SGS Sample Distance" and resolution of the DEM is fine enough to capture the gully line. If so, the topography modification MIN or GULLY option can be removed.


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