This (rather short) post is for my office mate Christina Carr, because she gets off on alluvial fans. This is an alluvial fan I photographed (in action!!!) this summer along the coast of Oregon. Based on the size, gradient, sediment, and geomorphology, this can be characterized as a debris flow fan. You can clearly see abandoned (and more importantly, unvegetated) depositional lobes, in addition to a new channel incision to the left of the old lobe.