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:

Hayakawa, Y.S., Oguchi, T., 2009: GIS analysis of fluvial knickzone distribution in Japanese mountain watersheds. Geomorphology 111, 27–37.
Hayakawa, Y.S., Oguchi, T., 2006: DEM-based identification of fluvial knickzones and its application to Japanese mountain rivers. Geomorphology 78, 90–106.

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. There is no python reference for this parameter.	Workspace
Input_DEM	Dialog Reference The input raster representing a continuous surface. There is no python reference for this parameter.	Raster Dataset
Relative_steepness_raster	Dialog Reference The relative steepness raster. (Output of the part1 of the KET: "Calculation of relative steepness" ) There is no python reference for this parameter.	Raster Dataset
Knickzone_threshold	Dialog Reference The value of gradient decrease Rd , below which the areas will be marked as knickzones. There is no python reference for this parameter.	Double
Knickzone_length_threshold	Dialog Reference The minimum length (in meters) of knickzones to be considered for analyses. There is no python reference for this parameter.	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) There is no python reference for this parameter.	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. There is no python reference for this parameter.	Dataset
Knickzones	Dialog Reference The output knickzones. There is no python reference for this parameter.	Shapefile

Extraction of knickzones

Title Extraction of knickzones

Summary

Usage

Syntax

Code Samples

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