GLY-1104 Lecture 6: CH16.10-.12
Document Summary
Glaciation- rebound effects change in flow direction: crust sinking (w/ new glacier) accumulates glacial lake, crustal rebound (as glacier melts) Oh rebound effects change in flow direction: glacial limit, current divide, laurentide ice sheet. Glacial and sea-level effect change in base level: glacial advance falling sea level, glacial retreat rising sea level. Tectonism : influences sediment production, precipitates orographic effect, rain shadow deserts. Orographic effect sierras: squeezes water out of clouds before other side. Climate or urbanization stream incision forms terraces. Stream incision: terraces flat to gently sloping benches or steps flanked by steeper slopes, changing base level (lowering) leads to terraces, tectonic uplift results in incised meanders canyons. What is/ isn"t a flood: below floodstage, slow flood: prolonged precipitation/ snowmelt, flash flood: quick/ intense rainfall also rapid decrease. Flood causes: regional precipitation boone creek, march 08, locally heavy precipitation boscastle, uk, 04, snowmelt, volcanic eruption jokulklaups, iceland, dam failure- teton dam, id, urbanization boone creek.
