Exam Three

Geoscience 102 with Benham at Pacific Lutheran University

About this deck

By: nicole jordan
Textbook:

Essentials of Oceanography (with OceanographyNOW, InfoTrac 1-Semester Printed Access Card)

Oceanography: An Invitation to Marine Science
Created: 2011-11-23
Size: 32 flashcards
Views: 6

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Waves breaking on a gently sloping beaxh will generally be ...

spilling breakers

what are three major factors that lead to the formation of large waves in the open ocean

strong winds

long distance

long time

Waves begin to break (become asymmetrical) when...

wave energy touches wave base

how are tsunami's created

island/ice big faring in ocean

meteroits falling in ocean

underwater earthquake in subduction zone

underwater land slide

underwater volcano

Which of the following are directly related to wave base

A-beach erosion during a storm

b storm surge

c-wave refraction

d- tsunami

e- tidal bore

f - seiche

A - beach erosion during a storm

c- wave refraction

Seiche

high/low pressure ( temperature change) on one side of the Large river

forcing a wave to flow back and forth from

resembles rocking

NOT A TIDAL WAVE

wave refraction

when wave base hits the sediment

and depending and the direction of the wind bends the wave North or South

causing a clear distinction in the ocean floor

tidal bore

river tries to flow into ocean but tide xomes in stronger pushes it back up river

wave length

Trough - trough /// crest- crest the distance from the to adjoining points is measured

wave height

trough to crest of a wave is measured

swell

symmetrical offshore wave

why do tropical regions have lower tidal range than the Northwest

rotation of the earth contradicted by the gravity from the moon and the sun

maximum tidal variation is observed when...

earth, sun and moon are lined up with moon another

A sand spit pointing north at the entrance to Grays Harbor ( Washington coast) indicates what?

longshore drift is from south to north

How are the tides altered when hurricane approaching Miami, FL during a normal high tide cycle

onshore winds, storm surge, makes tides higher than predicted

How are the tides altered when there is very nice, calm, cloud free, cold weather in the winter along the WA coast

cold weather- High pressure, pushing water offshore, tides lower than predicted

How are the tides altered when strong, onshore winds on a rainy, warm day along the WA coast

onshore winds brings water onshore,

warm day= low pressure= water rising

higher than predicted

Why is Hawaii, and some beaches in Cali, so much better for surfing as compared to the Gulf of Mexico and the eastern U.S.

gulf and east coast - warm water - comfortable gently sloping slope - no wave cut terraces

Hawaii/Cali - plunging waves fun for surfing

Identify two climatic factors that makes tides substantially higher than the printed tidal predictions

strong onshore winds

low pressure

wave cut terraces are commonly found on

erosional coasts with high banks

Mixed semidiurnal tides might be illustrated by

Two highs and two lows within a tidal day

the highs at two distinctly different heights

and two lows at two distinctively different heights

diurnal

one high and one low

semidiurnal

two highs and two lows

lows are at relatively same heights

highs are at relatively same heights

tidal bors flow how?

upstream as the tide floods

flood

when a tide/wave comes in

ebb

when a tide/wave goes out

when are tidal power plants effective

when there is a high tidal range in good geographic conditions to construct a dam

what are the negative aspects of tidal power

not always there when you need it -- tides can come in at four in the morning

it cant be stored efficiently at a good price

what are two organisms commonly found at the high tide level of Burly Lagoon how are they attached

mussels - cemented with byssal threads

barnecles - cemented

Why were there so few organisms living in the mid tide level on the Hendersonn Bay side of the Purdy spit

high wave energy, popular side, wood get washed on shore also crushing juveniles

rocky