An important part of the classic version of
TOPMODEL is the topographic index given by
is the upslope area per unit
contour length and
is the surface slope.
(e.g. Lane et al., 2004 for a modification).
Recently, Ambroise et al. (1996) and others have
proposed generalisations of this to deal with
different catchment characteristics (e.g.
parabolic and linear transmissivity profiles).
Ambroise B., Beven K., Freer J. 1996. Toward a generalization of the
TOPMODEL concepts: Topographic indices of hydrological similarity,
Water Resources Research
Lane SN, Brookes CJ, Kirkby MJ, Holden J. 2004. A network-index based
version of TOPMODEL for use with high-resolution digital topographic