Initial Landform

10 Iterations

100 iterations of mass removal based on preferential flow of water as calculated by r.topidx in GRASS. Notice how landform is cutdown most in stream channels, least at the ridges. The basins between ridges appear to "fill" with sediment near the 50th iteration as the entire landform is lowered to sea level (0m). Absolute change in elevation is visble in the elevation profiles below. Example GRASS commands below. Here is a link to a movie, containing all 100 iterations.

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Insolation duration on solar day 100, near Machete Ridge, Pinnacles National Monument.
Note the occurance of regions of less than 7 hours of sunlight on day 100.

Less than 7 hours	Less than 8 hours