GEOG 141 Lecture Notes - Lecture 15: Baseflow, Hydrograph, Convergent Boundary

• School: University of Oregon
• Department: Geography
• Course: GEOG 141
• Professor: Aaron Zettlerman

Document Summary

A story of fire, water, and disregarded geologic history. Flow style mass movements prominent feature with frequent history in region. Hot fires remove vegetation (cohesion decreases: burn hill slopes, removes vegetation roots holding soil together are gone (and so is cohesion) Create hydrophobic soil layer (infiltration decrease: wa(cid:454)(cid:455) stuff (cid:272)o(cid:373)es through a(cid:374)d (cid:449)ater (cid:272)a(cid:374)"t pe(cid:374)etrate it, be(cid:455)o(cid:374)d (cid:272)ertai(cid:374) ele(cid:448)atio(cid:374), a(cid:374)d it"s persiste(cid:374)t, large layers in hot fires. Heavy rainfall moves downslope quickly, scouring soils. Increase density of water/soil increase buoyance and destruction potential: decreased friction component and it starts to fall, picking up material downhill form it and it forms a positive feedback loop. Only predicter is the causal effects of these events: step-by-step of these events that accumulate to form these things. Analogy would be carrying a heavy backpack for a long time before taking it off. Extrusive igneous rock from fissures or volcanoes onto surface. Fluid lava flowing onto surface cools (cid:271)asalt (cid:862)effusi(cid:448)e(cid:863)