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Lecture 15

Lecture 15 - Running Water

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Earth Sciences
Earth Sciences 1022A/B
Stephen R Hicock

Running Water y Hydrologic Water Cycle o Water is transferred from the oceans to land then o Infiltration runoff evaporation transpiration by plants some locked up in glaciers o Most returns by streams y Stream Flow o Gradient channel slopesteeper faster flow o CrossSectional Shape can slow stream flow by friction o Discharge volume of water flowing through stream cross section each secondAs discharge increases other stream parameters width depth velocity also increaseDischargewidth x depth x velocitymeters x meters x 3meterssecondsmsecond y Work of Streams o Erosion use particles as tools to abrade channel walls and floor including potholes o Transport streams carry sediment loads in three waysDissolvedions in solution from chemical weatheringSuspendedfiner particles in the water column Bedloadcoarser particles sliding and rolling along the channel floorSaltationoccurs when particl
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