1. Malin and Edgett, 2000 (Mars) Costard et al., 2002 (Greenland) Gullies on Mars and Earth

2. PSP_002932_1445

3. Mangold: ‘Debris flows’ Some Levees (argues they are visible in Fig. 1 & 2). Cyclical sinuosity: Argues for ‘wet’ Nature of terminal deposits is not a discriminating factor (wet v dry). Terminal slope may help discriminate if flow properties and inertia are correctly modeled.

4. 5-m high flow, Jiangjia Gully, China (location referenced to by Coussot) Repeat Time in this channel is roughly 9-10 events/yr. (Chen et al., 2005, Environmental Geology, 48, 771-777. Image USGS/K. Scott, June 24, 1990

5. Stock and Dietrich, GSA Bulletin, 118, 1125-1148, 2006.

6. Discussion Points What are discriminating factors for recognizing debris flows? Flow magnitude/discharge in gullies? Are ‘typical’ flow characteristics inferred from images: –debris flows, hyperconcentrated flows, or something more quiescent? [two-phase vs one-phase…] –What is the formative flow conditions on gullied slopes? Is there a spectrum of behaviors? –Mechanics of sediment incorporation…