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A statistical framework to quantify spatial variation in channel gradients using the integral method of channel profile analysis
Author(s) -
Mudd Simon M.,
Attal Mikaël,
Milodowski David T.,
Grieve Stuart W. D.,
Valters Declan A.
Publication year - 2014
Publication title -
journal of geophysical research: earth surface
Language(s) - English
Resource type - Journals
eISSN - 2169-9011
pISSN - 2169-9003
DOI - 10.1002/2013jf002981
Subject(s) - channel (broadcasting) , stream power , erosion , spurious relationship , geometry , elevation (ballistics) , power law , exponent , flow (mathematics) , statistics , geology , hydrology (agriculture) , mathematics , soil science , geodesy , computer science , geomorphology , geotechnical engineering , telecommunications , linguistics , philosophy
We present a statistical technique for analyzing longitudinal channel profiles. Our technique is based on the integral approach to channel analysis: Drainage area is integrated over flow distance to produce a transformed coordinate, χ , which has dimensions of length. Assuming that profile geometry is conditioned by the stream power law, defined as E = KA m S n where E is erosion rate, K is erodibility, A is drainage area, S is channel gradient, and m and n are constants, the slope of a transformed profile in χ ‐elevation space should reflect the ratio of erosion rate to channel erodibility raised to a power 1/ n ; this quantity is often referred to as the channel steepness and represents channel slope normalized for drainage area. Our technique tests all possible contiguous segments in the channel network to identify the most likely locations where channel steepness changes and also identifies the most likely m / n ratio. The technique identifies locations where either erodibility or erosion rates are most likely to be changing. Tests on a simulated landscape demonstrate that the technique can accurately retrieve both the m / n ratio and the correct number and location of segments eroding at different rates where model assumptions apply. Tests on natural landscapes illustrate how the method can distinguish between spurious channel convexities due to incorrect selection of the m / n ratio from those which are candidates for changing erodibility or erosion rates. We also show how, given erosion or uplift rate constraints, the method can be used to constrain the slope exponent, n .