HCIC - Hydrological Connectivity Indices Collection

Author: Sim M. Reaney (c) 2024-25
Menu: Simulation | SCIMAP Toolkit 1.1

Description

This is a collection of different hydrological conenctivity indicies which repersent how different parts of the landscape connect to the rivers or lakes.

Network Index (see Lane et al. 2004, Lane et al. 2009)
Percentage Downslope Saturated Length

References

Lane S., Reaney S., Heathwaite A. (2009): Representation of landscape hydrological connectivity using a topographically driven surface flow index. WATER RESOURCES RESEARCH, 2009. Volume 45, Issue 8. https://doi.org/10.1029/2008WR007336
Lane, S.N. and Brookes, C.J. and Kirkby, M.J. and Holden, J. (2004): A network-index based version of TOPMODEL for use with high-resolution digital topographic data. Hydrological Processes, 18 (1). pp. 191-201.

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Digital Elevation Model	grid, input	`DEM`	-	-
Input	Rainfall Pattern	grid, input, optional	`RAINFALL`	-	-
Output	Slope	grid, output, optional	`SLOPE`	-	-
	Catchment Area	grid, output, optional	`CAREA`	-	-
	Connectivity	grid, output	`WETNESS`	-	-
Options	Grid System	grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	Critical Area for Channels (m²)	floating point number	`CRITAREA`	-	Minimum: 800000.000000 Default: 5.000000
	DEM Pre-Processing	choice	`PREPROCESS`	-	Available Choices: [0] Deepen Drainage Routes [1] Fill Sinks [2] Fill Sinks XXL (Wang & Liu) [3] Fill Sinks (Planchon/Darboux, 2001) [4] none Default: 0
	Flow Direction Method	choice	`FLOWDIRMETHOD`	-	Available Choices: [0] Deterministic 8 [1] Rho 8 [2] Braunschweiger Reliefmodell [3] Deterministic Infinity [4] Multiple Flow Direction [5] Multiple Triangular Flow Directon [6] Multiple Maximum Downslope Gradient Based Flow Directon Default: 4
	Convergence	floating point number	`CONVERGENCE`	Convergence factor for Multiple Flow Direction Algorithm (Freeman 1991)	Minimum: 0.000000 Default: 1.100000
	Wetness Index Method	choice	`WETNESSINDEXMETHOD`	-	Available Choices: [0] Classic TWI (Kirkby 1976) [1] SAGA Wetness Index Default: 0
	Connectivity Index	choice	`CONNINDEX`	-	Available Choices: [0] Network Index of Connectivity [1] Percentage Downslope Saturated Length Default: 0
	Rescale wetness index?	boolean	`RESCALE_WET`	Rescale wetness index?	Default: 1

Command Line


Usage: saga_cmd sim_scimap 1 [-DEM ] [-RAINFALL ] [-SLOPE ] [-CAREA ] [-WETNESS ] [-CRITAREA ] [-PREPROCESS ] [-FLOWDIRMETHOD ] [-CONVERGENCE ] [-WETNESSINDEXMETHOD ] [-CONNINDEX ] [-RESCALE_WET ]
  -DEM:                  Digital Elevation Model
	grid, input
  -RAINFALL:             Rainfall Pattern
	grid, input, optional
  -SLOPE:                Slope
	grid, output, optional
  -CAREA:                Catchment Area
	grid, output, optional
  -WETNESS:              Connectivity
	grid, output
  -CRITAREA:          Critical Area for Channels (m²)
	floating point number
	Minimum: 800000.000000
	Default: 5.000000
  -PREPROCESS:           DEM Pre-Processing
	choice
	Available Choices:
	[0] Deepen Drainage Routes
	[1] Fill Sinks
	[2] Fill Sinks XXL (Wang & Liu)
	[3] Fill Sinks (Planchon/Darboux, 2001)
	[4] none
	Default: 0
  -FLOWDIRMETHOD:        Flow Direction Method
	choice
	Available Choices:
	[0] Deterministic 8
	[1] Rho 8
	[2] Braunschweiger Reliefmodell
	[3] Deterministic Infinity
	[4] Multiple Flow Direction
	[5] Multiple Triangular Flow Directon
	[6] Multiple Maximum Downslope Gradient Based Flow Directon
	Default: 4
  -CONVERGENCE:       Convergence
	floating point number
	Minimum: 0.000000
	Default: 1.100000
  -WETNESSINDEXMETHOD:   Wetness Index Method
	choice
	Available Choices:
	[0] Classic TWI (Kirkby 1976)
	[1] SAGA Wetness Index
	Default: 0
  -CONNINDEX:            Connectivity Index
	choice
	Available Choices:
	[0] Network Index of Connectivity
	[1] Percentage Downslope Saturated Length
	Default: 0
  -RESCALE_WET:          Rescale wetness index?
	boolean
	Default: 1