GEOG 2051 : Exam 3 Notes
Document Summary
Building a dam on a river raise the local base level of that river channel. This would result in : aggradation, we no longer have energy to pull that stuff, so we are going to dump the sediment there. Ultimate base level determined by sea level, but sea level has varied over earth"s history as a result of natural and more recently human-induced climate change. How would a drop in sea level affect rivers near the coast: rivers would start to erose deeper down to decrease the elevation of the river bottom (called degradation) Sediment transport: flowing water, moving sediment, changing form. Longitudinal bar: if oriented perpendicular, transverse bars. Most of the change is in channel width: if we are looking at how a river changes, its. Width is going to increase the most: single-cross section, as the discharge increases, the width will not change, instead, the flow depth is increasing, depth, velocity. Scouring out of channel via fluvial erosion.
