At last, a comparison of erosive power on the Indus and Yarlung Tsangpo. The She Qu divide is where An Yinn sees evidence of the Yarlung Tsangpo reversing the flow of the Siqunama River and flowing into the Subansiri River. (download full-res image)
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Click here to download high resolution.
With proffix.py version 0.092, we created profiles for 684833 cells of the the
Tsangpo/Siang and 1414 tributaries, based on the depressless hydrosheds 3" DEM.
As a point-to-point slope would be too noisy, we defined to slope at each point
over the length from the next highest elevation to the next lowest elevation (or
to the end of the stream, if that cam first.) Three other versions of slope
were calculated, using the the additional constraint of looking at least 500m,
1000m, or 2000m in each direction. The last of these (twice 2000m or 4 km) is
the same method of caculating slope in Robl, Silwe,&Hergarten.
Three of the four slopes are shown below, both for the entire basin and for the Namche
Barwe region. Some of the detail is obscured by the point size.
and here are stream power figures based on those slopes and an eight-year mean
TRMM rainfall.
Following are three more version of power (based on the 4-km slope) with
different symbology and scaling.
And here is power is kilowatts/meter:
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