EAS100 Lecture Notes - Lecture 13: Baseflow, Hydrosphere, List Of U.S. States And Territories By Elevation

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EAS 201: Lecture 13
February 4, 2019
Notes referring to Karlis Muehlenbachs’ slides, February 4, 2019.
pH as a measure of how much hydrogen ions are present (hydrogen ions produced by
dissociation of water).
o If H+ concentration goes up, water becomes acidic.
o If it goes down, water becomes alkaline.
o Rain water has pH ~ 5.6.
Density:
o Pure water has a density maximum at 4 degrees Celsius.
o Salty water higher salinity means higher density.
Properties of Ice:
o Is an unusual mineral.
o Has an open crystal lattice has lower density than liquid.
o It floats, water expands as it freezes expanding freezing water can fracture
rocks.
Phases of Water:
o Solid, liquid, gas.
o Energy Absorbed: (gain) solid liquid gas
o Energy Released: (loss) gas liquid solid
Hydrosphere all water at or near the surface
of the Earth.
o Surface of the Earth is 3/4s water.
o Image from Karlis Muehlenbachs’ lecture
slides.
o Oceans = 97.5% Earth’s water.
o Glacial Ice = 1.81% Earth’s water.
o Ground Water = 0.63%.
Water moves downhill during rainfall.
o Initially as sheet flow (overland flow).
o Is concentrated into stream flow.
Consists of storm flow & base
flow.
No base flow = ephemeral.
Base flow = perennial.
Body of flowing water confined to a channel is defined as a
stream.
o River is used to describe major branches of a stream
system.
o Area where stream draws its water supply from is the
drainage basin.
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