NATS 1750 Lecture Notes - Lecture 15: Downcutting, Water Cycle, Oxbow Lake
30 Dec 2019
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Document Summary
Jan/15/2019 portion could be collected in a sphere with a diameter of 275km. The hydrologic cycle = the movement of water around the earth"s system. Freshwater contains less than 500ppm dissolved salts. Most water on earth is salt water, and most of the freshwater is frozen or underground. All the water in the world could be collected in a sphere with a diameter of 1,300km; the freshwater. Excess surface water (runoff) comes from rain, from melting ice and snow, and from springs. Drainage networks: ground, water accumulates in puddles or swamps, but on slopes, it flows downslope in streams. Downcutting are tributaries draining into a trunk stream, providing a conduit for the removal of runoff throughout a region. Drainage basin = the overall region drained by a given drainage network. Divide = the boundary between two drainage basins. At a stream-gaging station , geologists measure the cross-sectional area, the depth, and the average velocity of the stream.
