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Geology 1010 - Lecture 17 already graded A+ 2023/2024
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Geology 1010 - Lecture 17 already graded A+ 2023/2024
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Geology 1010 - Lecture 17Why do we care? - ANSmajor agent of weathering and erosion; important sources of freshwater
for drinking and irrigation; flood is the most common type of natural hazard
drainage basin - ANSentire low lying area where all the water will drain into that river/stream
channels - ANSwhere all the water has filled in and is moving; causes v-shaped valleys
v-shaped valleys - ANSvalley around river that has been sharpened due to water erosion
tributaries - ANSsmaller streams that feed water into larger ones
3 different patterns of tributaries: - ANSbranching/dendritic, radial, rectangular
branching/dendritic pattern - ANSlook like branches or veins; small acute angle where rivers
meet; very common
radial pattern - ANSrivers around edges, but not center; helps to see the high points of
landscape; middle is top of a hill
rectangular pattern - ANSrivers meet at 90 degree angles; very blocky look; indicates fractures
in bedrock underneath river like joints, water follows joint patterns
levee - ANSarea of raised elevation on either side of channels; form naturally from dropped
sediment due to flooding, but can be manmade as well
floodplain - ANSflat plain-like area that will flood when river overflows its banks; popular for
development, so must be mindful
braided stream/river - ANSseveral channels similar in size that intertwine with each other; rare
3 causes of braided streams/rivers - ANSvariable discharge, large sediment supply, easily
erodible banks
variable discharge - ANSwater amount varies a lot
large sediment supply - ANSerodes a lot of material, depositions clog channels and water must
divert and flow around it
easily erodible banks - ANSallows channel to widen and split
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