Kinesiology 1080A/B Lecture Notes - Lecture 22: Bed Load, Distributary, Transpiration
13 Nov 2014
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Document Summary
Water is transferred from the oceans to land, then. Infiltration, runoff, evaporation, transpiration by plants, some locked up in glaciers. Cross-sectional shape can slow stream, flow by friction. Discharge: volume of water flowing through stream cross section each second. As discharge increases other stream parameters (width, depth, velocity) also increase. Erosion: use particles as tools to abrade channel walls and floor, including potholes. Transport: streams carry sediment loads in three ways . Dissolved ions in solution from chemical weathering. Suspended finer particles in the water column. Bed load coarser particles sliding and rolling along the channel floor. Saltation occurs when particles alternate between the bed and suspended loads. Deposition: occurs when a stream slows down big particles settle first, then small ones Coarser channel deposits as bars; finer floodplain deposits. Narrow: v-shaped by down cutting on a steep gradient as the sides cave in; waterfalls and rapids common. Wide: mainly sideways cutting on a gentle gradient; floodplains.
