There has been some discussion on this list before about using
TOPMODEL in GRASS. Most of us have just figured that using the r.watershed
was good for calculating the parameter "a".However, I have recently learned that it is important that the
water be allowed to follow MULTIPLE FLOWPATHS for a reasonable accurate
saturated area map. Has anyone implemented such a routine in GRASS?
S. Chairat and J. Delleur have published a paper on this, but I don't know
how to get their algorithm (S. Chairat is in Tunisia). I would be very
interested in discussing this further with anyone.Jane Rossing
jr20@cornell.edu
Below are some references, see Costa-Cabral & Burges for an extensive
discussion on single/multiple flowpaths. Freeman contains an algorithm
(but note the difference of the power coefficient between Freeman and
Holmgren!). I have some preliminary code but *not* for grass because
there is not floating point raster support yet. You may contact me
directly if you need more info.
Could you provide a pointer to the Chairat/Deleur paper?
-Raymond (venn@geo.vu.nl)
[WRR: Wat. Resour. Res.; CG: Comp. & Geosc.; HP: Hydrol. Proc.]
@Article{b-costacabral-burges-94,
author = "M. C. Costa-Cabral and S. J. Burges",
title = "Digital Elevation Model Networks {(DEMON)}: A Model of
Flow over Hillslopes for Computation of Contributing and
Dispersal Areas",
journal = WRR,
volume = "30",
number = "6",
pages = "1681--1692",
year = "1994",
}
@Article{b-freeman-91,
author = "T. G. Freeman",
title = "Calculating Catchment Area with Divergent Flow Based
on a Regular Grid",
journal = CG,
year = "1991",
volume = "17",
number = "3",
pages = "413--422",
}
@Article{b-holmgren-94,
author = "P. Holmgren",
title = "Multiple Flow Direction Algorithms for Runoff Modelling
in Grid Based Elevation Models: An Empirical Evaluation",
journal = HP,
volume = "8",
pages = "327--334",
year = "1994",
}
@Article{b-quinn-et-al-91,
author = "P. Quinn and K. Beven and P. Chevallier and O. Planchon",
title = "The Prediction of Hillslope Flow Paths for Distributed
Hydrological Modelling Using Digital Terrain Models",
journal = HP,
volume = "5",
pages = "59--79",
year = "1991",
note = "Reprinted in Beven and Moore (Eds), 1992",
}