i11fluvial - 11/13/2008 Fluvial Systems and Landforms...

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11/13/2008 1 Fluvial Systems and Landforms • Overland Flow – Perennial Streams – water runs all year – Ephemeral Streams – water runs only part of year • Sources of stream water: – Groundwater – Melting Ice – Surface Runoff Drainage Basins • Drainage Basin – area contributing groundwater and runoff to a stream – also called Watershed • Drainage Divide – elevated terrain forming rim around a drainage basin • Water flows from Tributaries high in basin to Trunk Stream, largest stream in basin core • Drainage basins vary tremendously in size • Basins are nested, smaller within larger Drainage Patterns • Dendritic – uniform rock structure • Rectangular – jointed • Trellis – extreme fold- ing of rock layers • Radial – rounded upland like volcano Drainage Density Total length of all streams Drainage Density = Area of drainage basin Stream Ordering • Represents stream size • Smallest streams in basin order 1 • order rises when 2 streams of same order come together at confluence
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11/13/2008 2 Hydraulic Geometry • Geometric attributes of river channels • Variables: – w = channel width – d = channel depth – v = velocity of water – s = slope (gradient) – Q = discharge
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This note was uploaded on 10/06/2011 for the course GEOL 101 taught by Professor Staff during the Spring '11 term at S.F. State.

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i11fluvial - 11/13/2008 Fluvial Systems and Landforms...

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