Tool Name	Breach Depressions
Tool ID	7
Library ID	ta_preprocessor
Version	1.0
Author(s)	O.Conrad (c) 2020

Description

This tool removes all depressions in a DEM by breaching. It can be used to pre-process a digital elevation model (DEM) prior to being used for hydrological analysis. It uses a cost-distance criteria for deciding upon the breach target, i.e. the cell to which the tool will trench a connecting path, and for determining the breach path itself (from the WhiteBox GAT documentation).

This is a re-implementation of the 'Breach Depressions' Java code as provided by Dr. John Lindsay's WhiteBox GAT software.

References

WhiteBox GAT

Parameters

Name	Type	Identifier	Description	Constraints
Input
Elevation	grid, input	DEM
Output
Preprocessed	grid, output, optional	NOSINKS
Options
Maximum Breach Channel Length	integer number	MAX_LENGTH	[Cells]	Minimum: 1 Default: 50
Maximum Elevation Decrement	floating point number	MAX_ZDEC		Minimum: 0.000000 Default: 0.000000
Minimum Elevation Drop	floating point number	MIN_ZDROP		Minimum: 0.000000 Default: 0.000000