River basin delineation
NUNATARYUK will determine the impacts of thawing coastal and subsea permafrost on the global climate, and will develop targeted and co-designed adaptation and mitigation strategies for the Arctic coastal population. As part of this work NUNATARYUK develops quantitative understanding of the fluxes from land to sea. This demands modeling the flow of water across the Arctic landscape. This blog and repository contains the codes and scripts, and instructions, for an analysis framework developed as part of Nunatrayuk and with the aim of modeling landforms, hydrology and water flow.
Installations and setup
Introduction
Water flow and river basins have a momentous influence on both natural landscapes and processes as well as on human societies. To understand water flow through and out of the landscape, correctly delineate the boundaries between different basins is essential.River basin delineation
This blog is on how to delineate river basins from Digital Elevation Models (DEM) using a combination of different applications. The core tools used are GRASS GIS and Python scripting bundled to GDAL. QGIS is used for visualisation and inspection. If you want to follow this tutorial series in all its details, you first need to make som installations and setup.Installations and setup
GRASS 7 setup Introduction Eclipse for Basin extraction Setup Eclipse for the Python packages Basin_extraction git clone basin_delineate git clone basin_delineate from GitHub for use in Eclipse Make a git repo Make a GitHub repo for basin_delineate, clone it locally and add the PyDev project and push it back to GitHub
River basin delineation
Basin delineation: 1 patch up DEM Patch up the DEM using GRASS Basin delineation: 2 GRASS watershed analysis Use GRASS7 r.watershed module for analysing drainage direction and accumulated upstream area Basin delineation: 3 Python distilling Python script for analysing and distilling basin candidates, and producing GRASS script for step 4 Basin delineation: 4 GRASS basin delineation Use GRASS7 for delineating river basins
GRASS 7 setup Introduction Eclipse for Basin extraction Setup Eclipse for the Python packages Basin_extraction git clone basin_delineate git clone basin_delineate from GitHub for use in Eclipse Make a git repo Make a GitHub repo for basin_delineate, clone it locally and add the PyDev project and push it back to GitHub
River basin delineation
Basin delineation: 1 patch up DEM Patch up the DEM using GRASS Basin delineation: 2 GRASS watershed analysis Use GRASS7 r.watershed module for analysing drainage direction and accumulated upstream area Basin delineation: 3 Python distilling Python script for analysing and distilling basin candidates, and producing GRASS script for step 4 Basin delineation: 4 GRASS basin delineation Use GRASS7 for delineating river basins
Basin delineation: 1 patch up DEM Patch up the DEM using GRASS Basin delineation: 2 GRASS watershed analysis Use GRASS7 r.watershed module for analysing drainage direction and accumulated upstream area Basin delineation: 3 Python distilling Python script for analysing and distilling basin candidates, and producing GRASS script for step 4 Basin delineation: 4 GRASS basin delineation Use GRASS7 for delineating river basins