General Manual - Geo-MHYDAS 12.01

General Manual Geo-MHYDAS 12.01

These scripts are made for the Digital Landscape Representation (DLR) for MHYDAS model running with the OpenFLUID platform 1.6.x or superior.
Ubuntu linux operating system and GIS GRASS software version 6.3 or superior are needed.

The two following units can be produced: Surface Units (SU) and Reach Segments (RS). For more informations about these concepts, see OpenFLUID website

For more informations, please read:

Lagacherie, P., Rabotin, M., Colin, F., Moussa, R. and Voltz, M., 2010. Geo-MHYDAS: A landscape discretization tool for distributed hydrological modeling of cultivated areas, Computers & Geosciences, 36, p.1021 - 1032. See more

The following input geographical layers can be provided for the segmentation procedures :

- DEM raster (compulsory) (e.g. ArcInfo Raster, Ascii file ...)

- land use vector layer (e.g. shapefiles ESRI, ArcInfo Coverage)

- soil use vector layer (e.g. shapefiles ESRI, ArcInfo Coverage)

- reach segments vector layer (e.g. shapefiles ESRI, ArcInfo Coverage)

- subwatersheds vector layer (e.g. shapefiles ESRI, ArcInfo Coverage)

Importing these layers in GRASS GIS software can be done by r.in.gdal command for raster data and v.in.ogr command for vector layer. If you use these scripts for the whole Digital Landscape Representation procedures and want to create the two unit types (SU and RS), at the minima the bold scripts are compulsories, the others are optionals.

Processsing geographical objects

m.disline	Dissolving small linear entities.
m.dispolyg	Dissolving small areal entities.
m.douglas	Smoothing areal entities (Douglas Peucker algorithm).
m.network	Hydrological network verification (rooted tree).
m.sbw	Subwatershed calculation program with hydrological network influence.
m.segline	Splitting linear entities by points.
m.snaplp	Snapping linear entities on areal entities.

Creating hydrological units by selective overlays

m.colseg	Patch desired columns from the input polygon vector to the segmented output vector.
m.dispolygseg	Dissolving small areal entities (with hierarchical level) after segmentation.
m.extractlineseg	Linear units extraction after segmentation.
m.seg	Segmentation Procedure.
m.sliverpolygseg	Dissolving sliver entities with hierarchical level after segmentation (use Gravelius Index).

Building oriented topologies of hydrological units

m.toporeach	Topology calculation for reach segments and generation of MHYDAS RSdefs.dat file.
m.toposu	Topology calculation for surface units and generation of MHYDAS SUdefs.dat files.
m.definput	Creation xml input files for OpenFluid Engine 1.4.

AUTHORS

Michael Rabotin, UMR LISAH, Montpellier, France

rabotin@supagro.inra.fr

Last Changed: 23 January 2012