i11fluvial - Fluvial Systems and Landforms Overland Flow...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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 & faulted rock 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
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon