Hi,
in the book "Geomorphometry - Concepts, Software, Applications" I've found a
short paragraph about the Stream power Index (SPI).
the SPI can be used to describe potential flow erosion related to landscape
processes.
in the book SPI is defined as:
SPI = A x tan(beta)
where A is the specific catchment area and beta is the local slope angle.
in link [1] there is the SAGA GIS formula.
sometimes SPI is also defined as:
SPI = ln(A x tan(beta))
my idea for SPI calculation in GRASS GIS may be:
A = {accumulation flow by r.watershed} x {ns resolution x ew resolution}
beta = r.slope slope
anyone ever used/calculated SPI in GRASS GIS? any hints for calculation?
[1] http://www.saga-gis.org/saga_module_doc/2.1.4/ta_hydrology_21.html
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best regards
Helmut
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