CHYM Cetemps HYdrological Model
Watershed extraction and representation for different domains

Tests for Watershed extraction and representation using Rolling Stones (RSA), Cellular Automata(CA) and Salmone(SA) algorithms are reported for different domains. For all the considered domains the above algorithms are able to realistically reproduce the actual drainage network. For a correct interpretation of the plots, please consider what follow:

• The drainage networks is rebuilt considering only the rivers whose mouth belongs to the set domain. In order to avoid confusion the drainage networks are paint using only rivers and streams of first two orders;
• CHyM implements Land Use from USGS database with 99 landuse categories and not all categories are included in the legend. Because of this few zones (for example Scandinavia or Amazzonia) appera "white" in the landuse plot;
• In order to display a significant part of big basins we used, in few cases (for example the Rio delle Amozzoni basin), a very large domain. In this cases drainage network could appear not continuous, this is just a small graphic bug (the number of pixel may be lower than the number of numerical cells);
• In few cases (for example North West of Spain) Drainage network is not rebuilt. This is due to the low resolution we set in order to reproduce the drainage network for thw whole Iberic Peninsula.
• Often it can be see segments of rivers just as a sequence of "dot". This is due to the fact that USGS database "sees" few segmets of large river catchemets as internal water.

In the following tables the last line of each header reports the CHyM Parameters used to simulate the domain, respectively: NLON is the number of longitudes, NLAT is the number of latitudes, SLON is the first longitude, SLAT is the first latitude, DIJ is the lat/lon resolution. At medium latitudes, the value 0.020 for this parameter corresponds to about 2 Km. DEMF is a flag specifing the source for DEM data (1=Italian DEM 300m of resolution, 2=World DEM 0.00833 deg of resolution, 3=both DEM's are used).

The rivers dear to my old friend Fred The Weser river go through Bremen (where Fred Kucharski was born), The mouth of Elba river is close to Amburg (right westward of Danish Peninsula), political boundaries between Germany and Poland follow for many chilometres the path of Oder river. NLON = 550, NLAT = 350, SLON = 6.00, SLAT = 49.00, DIJ = 0.020, DEMF = 2
The Digital Elevation Model	The drainage network	The landuse map	The Flow Check

Po and Danubio Rivers NLON = 650, NLAT = 350, SLON = 6.00, SLAT = 44.00, DIJ = 0.020, DEMF = 3
The Digital Elevation Model	The drainage network	The landuse map	The Flow Check

Main Rivers of Indian Peninsula The Indo river mouth is located in the North West part of the Domain. In South East it can be recognized the mouth of the Krisna river, in the Central Est part the mouth of Godaveri river. NLON = 450, NLAT = 450, SLON = 72.50, SLAT = 13.00, DIJ = 0.025, DEMF = 2
The Digital Elevation Model	The drainage network	The landuse map	The Flow Check

The Holy River The imposing delta of Gange river, and souther Mahanadi river. NLON = 550, NLAT = 350, SLON = 79.50, SLAT = 19.50, DIJ = 0.025, DEMF = 2
The Digital Elevation Model	The drainage network	The landuse map	The Flow Check

Le rives de France It can be recognized the basins of Senne, Loire, Gironde and Rodano. NLON = 500, NLAT = 400, SLON = -2.50, SLAT = 42.10, DIJ = 0.020, DEMF =3
The Digital Elevation Model	The drainage network	The landuse map	The Flow Check

The rivers of Iberic Peninsula It can be recognized the basins of Guadiana, Ebro, Tago and Guadalquivir. NLON = 550, NLAT = 400, SLON = -9.50, SLAT = 36.00, DIJ = 0.020, DEMF = 2
The Digital Elevation Model	The drainage network	The landuse map	The Flow Check

The rivers of Scandinavian Peninsula The drainage network of Scandinavian Peninsula is characterized by many small basins, for example the Gota, the Dalalveri and Stroms Vattudal. NLON = 750, NLAT = 400, SLON = 4.50, SLAT = 57.90, DIJ = 0.020, DEMF =2
The Digital Elevation Model	The drainage network	The landuse map	The Flow Check

The historical delta of Nilo River The definition of the catchements in this case is not perfect because of low resolution. In any case this is the Nilo basin. NLON = 450, NLAT = 700, SLON = 25.00, SLAT = 20.00, DIJ = 0.020, DEMF =2
The Digital Elevation Model	The drainage network	The landuse map	The Flow Check

"Swing low Alabama, You got spare change, you got to feel strange" (Neil Young) Confluence between Alabama river and Tombigbee river, just before the mouth in the Gulf of Mexico. NLON = 400, NLAT = 450, SLON = -90.00, SLAT = 30.00, DIJ = 0.020, DEMF =2
The Digital Elevation Model	The drainage network	The landuse map	The Flow Check

Rio delle Amazzoni The huge Rio delle Amazzoni basin NLON = 800, NLAT = 650, SLON = -65.00, SLAT = -10.00, DIJ = 0.020, DEMF =2
The Digital Elevation Model	The drainage network	The landuse map	The Flow Check