GEO 101 Lecture Notes - Lecture 24: Karst, Headward Erosion, Drainage Divide
28 Mar 2017
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Document Summary
Discussed groundwater contamination, caves, and karst topography. Precipitation (rain) occurs: begins as sheetwash, sheetwash digs tiny channels called rills, rills downcut; develop into streamflow. Smaller tributaries join a larger trunk stream. The array of linked channels is a drainage networks. Common drainage patterns: dendritic, rectangular, trellis, radial, deranged. Water cuts channels through softer geologic units. Land-areas that drain into a specific stream system. Drainage basins are separated up upland, high topography areas called divides. Drainage basins exist at a variety of scales. Continental divides separate flow to different oceans. Land-area contributing water to stream drainage basin. Imaginary line separating one basin from another drainage divide. Two types: laminar flow (from slow flow) No mixing between layers: turbulent flow (from fast flow) Type of flow depends on velocity, which is controlled by several different factors. The slope of a stream (steep or shallow) Steeper in upper parts and gentler in lower parts.
