Tides

Question 1

crest

Answer 1

high tide

Question 2

trough

Answer 2

low tide

Question 3

tidal range

Answer 3

difference between high/low tide

Question 4

tidal period

Answer 4

time difference between high/low tide, from 12hrs 25 mins to 24hr 50 min

Question 5

measure tides

Answer 5

tide stations (floats on sea and measures tides)

Question 6

spring tides

Answer 6

highest high tide, lowest low tide

Question 7

neap tide

Answer 7

highest low tide, lowest high tide

Question 8

what do high tides coincide with

Answer 8

storm surges

Question 9

how does coastal flooding occur

Answer 9

when high pressure pushes on ocean, if there’s tides it can cause flooding

Question 10

diurnal tides

Answer 10

one high/low tide a day

Question 11

semidiurnal tides

Answer 11

two high/low tides a day

Question 12

mixed tides

Answer 12

two high/low tides a day on unequal tidal range

Question 13

how often do spring/neap tides occur

Answer 13

twice a month

Question 14

how many tides does earth have a day

Answer 14

2 high/low tides

Question 15

how are tides formed

Answer 15

gravitational force on ocean from moon and part of sun

Question 16

how does distance/mass effect pull

Answer 16

further away is weaker, heavier is stronger

Question 17

what forms high tide

Answer 17

gravitational pull from moon pulls ocean towards it creating high tide, the part that isnt pulled is low tide

Question 18

what time does high tide occur

Answer 18

12hr 25, 24hr 50

Question 19

what creates bulges that are positioned opposite to each other

Answer 19

gravity and centrifugal force

Question 20

how much more gravitational pull does moon exert

Answer 20

twice

Question 21

centrifugal effect

Answer 21

earth pushes water out so can be pulled by moon

Question 22

equilibrium model assumes

Answer 22

earth has no land, progressive waves and water is equilibrium with tide generating forces

Question 23

what does equilibrium model mean

Answer 23

high latitudes have diurnal, mid latitude has mixed tides, low latitudes have semi diurnal

Question 24

when do spring tides occur

Answer 24

when earth/moon/sun aligned in straight line, bulges are larger than usual, equal pulling, greatest pull

Question 25

when do neap tides occur

Answer 25

when earth/moon/sun aligned at 90 degrees, tidal bulges destructive, least pull, lowest bulge

Question 26

why do tides occur 50 mins later each day

Answer 26

due to earth’s rotation/moon orbit

Question 27

when does lunar day occur

Answer 27

24hrs 50 min

Question 28

dynamic model

Answer 28

actual earth, as earth rotates it forces water west which piles up and causes pressure gradient, water flows high to low which gets deflected by Coriolis to right and piles to south and builds up, high to low then Coriolis to east side then north etc

Question 29

micro tidal

Answer 29

less than 2m

Question 30

macro tidal

Answer 30

greater than 4m

Question 31

diurnal (model)

Answer 31

1 cycle round basin

Question 32

semi diurnal (model)

Answer 32

2 cycles round basin

Question 33

wave progression

Answer 33

wave progresses over node (no displacement in middle of basin) to antinode (displacement, edge of basin)

Question 34

where is highest tidal wave

Answer 34

furthest from node

Question 35

what does dynamic model result in

Answer 35

rotary wave

Question 36

long/narrow basins

Answer 36

not enough room to rotate to rush in/out, cotidal/corange parallel

Question 37

tidal bore

Answer 37

water surges upriver with advancing high tide in narrow basins

Question 38

factors needed for tidal bore to happen

Answer 38

large tidal range, narrow basin, decreasing depth upriver

Question 39

flood current

Answer 39

water approaching land with high tide