Extraction of knickzones

Title  Extraction of knickzones

Summary

Knickzone Extraction Tool. Part 2

Included as the second part of KET, this tool uses the relative steepness raster (Finalraster.tif) computed previously to extract fluvial knickzones along the longitudinal river profile using some user input. It also calculates the, height and length of the knickzones.

The final output "Knickzones" contains these information as attributes. A separate text file with the attributes "Zonal_.csv" will also be a part of the output in the workspace.

References:


Usage

Extraction of fluvial knickzones


Syntax

KET2 (Workspace, Input_DEM, Relative_steepness_raster, Knickzone_threshold, Knickzone_length_threshold, {Flow_accumulation_threshold}, {Stream_network}, Knickzones)

Parameter Explanation Data Type
Workspace Dialog Reference

The workspace that will be used for the analysis.

Workspace
Input_DEM Dialog Reference

The input raster representing a continuous surface.

Raster Dataset
Relative_steepness_raster Dialog Reference

The relative steepness raster. (Output of the part1 of the KET: "Calculation of relative steepness" )

Raster Dataset
Knickzone_threshold Dialog Reference

The value of gradient decrease Rd , below which the areas will be marked as knickzones.

Double
Knickzone_length_threshold Dialog Reference

The minimum length (in meters) of knickzones to be considered for analyses.

Double
Flow_accumulation_threshold (Optional) Dialog Reference

Number of cells draining into a cell along the stream network.

Use larger values for sparse drainage networks and smaller values for denser stream networks.

(If pre-calculated stream is provided, the tool will skip the stream generation)

Double
Stream_network (Optional) Dialog Reference

Supply, if previously calculated. Supplying a pre-determined stream network will skip the steps for stream calculation and considerably lessen the calculation time.

If not specified, a stream network file will be placed in the working directory in the first run.

Dataset
Knickzones Dialog Reference

The output knickzones.

Shapefile

Code Samples

Tags

Knickzone

Credits

Use limitations