Docsity.com
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Guidelines and tips
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
The Earth-Moon System and Tides: Gravitational Forces, High Tides, and Coastal Impacts, Slides of Geology
The earth-moon system's influence on tides, including the gravitational and centrifugal forces that create high and low tides. It also discusses tidal braking, the impact of the sun, and coastal erosion caused by sea level rise and seawalls. Examples of coastal locations and geological features.
Typology: Slides
2012/2013
1 / 20
This page cannot be seen from the preview
Don't miss anything!
Related documents
Partial preview of the text
Download The Earth-Moon System and Tides: Gravitational Forces, High Tides, and Coastal Impacts and more Slides Geology in PDF only on Docsity!
Earth-moon system creates a double pull on Earth’s water at it rotates around a common center: 1. Gravitational toward moon 2. Centrifugal (inertial) away from moon Both of these deform thewater envelope of Earth andcreate a high tide. Earth’ssurface “slides” under thewater envelope during itsdaily rotation.
Tides
Image removed due tocopyright restrictions.
Tidal braking changes day length
Tidal braking: days lengthen by 2.3 milliseconds/day/century620 Mybp:
21.9 hours
900 Mybp:
(Williams, 1997, GRL)
2.5 Gybp:
3 Gybp:
(Walker et al., 1983)
3.2 Gybp:
(Ericsson and Simpson, 2000)
NW coast of Scotland
Elkins-Tanton
Beach cobbles from northern Maine
Elkins-Tanton
Pothead whale, NW coast Newfoundland
Elkins-Tanton
Sea stack, St. Finton’s, Newfoundland
Elkins-Tanton
Barrier islands
NASA
Docsity.com
Sandy shorelines erode ~100 increments for every 1 increment of sea-level rise. For a 1 m rise by 2100, beaches will recede 100 m
Sea level rise:Beach erosion = 1:
Image removed due tocopyright restrictions.
Many Hawaiian beaches
suffer erosion because their^ dunes have been destroyed^ (even before seawalls have
been built)
Coastal dunes are a storehouse
of sand for the beach
Image removed due tocopyright restrictions.
Image removed due tocopyright restrictions.
Seawalls worsen erosion by
impounding dune sand.
This starves the beach, often leading
to accelerated
erosion on adjoining beaches –
widespread beach
loss can develop
Image removed due to copyright restrictions.
Continental shelves are apparent in bathymetry
National Geophysical Data Center/NOAA
Turbidites
USGS
Namibian turbidite Ecole des Mines de Paris
Image removed due tocopyright restrictions.
Winter north swell Summer south swell Trade wind waves
and swell
Kona storm waves Hurricane waves and
swell
Sources of Hawaiian waves
Image removed due tocopyright restrictions.