Tool Name	CIT Index
Tool ID	31
Library ID	ta_hydrology
Version	1.0
Author(s)	V. Wichmann (c) 2021

Description

The tool allows one to calculate a variant of the Stream Power Index, which was introduced to detect channel heads (channel initiation) based on a drainage area-slope threshold. The Channel Initiation Threshold (CIT) index is calculated as: CIT = SCA * tan(Slope)^2

References

Montgomery, D.R., Dietrich, W.E. (1989): Source areas, drainage density and channel initiation. Water Resources Research 25, p.1907-1918.

Montgomery, D.R., Foufoula-Georgiou, E. (1993): Channel network source representation using digital elevation models. Water Resources Research 29, p.3925-3934.

Parameters

Name	Type	Identifier	Description	Constraints
Input
Slope	grid, input	SLOPE	The slope grid [radians].
Catchment Area	grid, input	AREA	The catchment area grid [map unitsz^2].
Output
CIT Index	grid, output	CIT	The Channel Initiation Threshold index.
Options
Area Conversion	choice	CONV		Available Choices: [0] no conversion (areas already given as specific catchment area) [1] 1 / cell size (pseudo specific catchment area) Default: 0