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Topic: Longshore drift


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In the News (Wed 19 Jun 19)

  
  Longshore drift Summary
Longshore drift is the transport of sand along a beach by waves impinging or breaking at an angle to the beach.
Longshore drift is one of the principal processes in the construction of spits, bars and tombolos, and in the overall sustainability of beach deposits.
Jetties and groynes generally do not stop longshore drift, but interfere with it to the extent of retaining some of the beach material which might otherwise be removed.
www.bookrags.com /Longshore_drift   (1050 words)

  
  Longshore Drift - Search Results - MSN Encarta
Longshore Drift, movement of sand parallel to the shoreline, in the “along-the-shore” direction.
Longshore drift is caused by the water waves...
Drift mining is used when a horizontal seam of coal emerges at the surface on the side of a hill or mountain, and the opening into the mine can be...
encarta.msn.com /Longshore_Drift.html   (0 words)

  
  Longshore Drift: World of Earth Science
Longshore drift is the transport of sand along a beach by waves impinging or breaking at an angle to the beach.
Longshore drift occurs when a wave breaks, lifts sand into suspension, and then throws a pulse of sand-bearing water (swash) up the slope of the beach.
Longshore drift is one of the few processes that can transport sand for long distances along a slope at a fixed altitude.
science.enotes.com /earth-science/longshore-drift   (307 words)

  
 OC/GEO 103 Lab 8
Longshore drift transports sediments along shorelines by way of longshore currents, which cause some of the changes that we see in the distribution of sands at a beach.
Longshore currents are maintained by the wave energy component travelling parallel to the shoreline, which causes part of the water mass to be transported along the shoreline as well.
Longshore transport of sand is caused by the longshore current in combination with the stirring up of sand by wave action.
oregonstate.edu /instruct/oc103/lab7.html   (953 words)

  
 Longshore Drift
This process is called longshore drift and is generated by wave and current action.
The net effect of sediment moving southward causes the north end of barrier islands in the southeastern United States to erode and the south end to accrete (Keener-Chavis, P. and Sautter, L, 2000).
The action of southerly-directed longshore currents, wave refraction, and tidal currents, large reservoirs of sand in the form of sand bars tend to drift downward and inward toward the upper parts of islands that are south of coastal inlets.
www.cofc.edu /CGOInquiry/longshoredrift.htm   (314 words)

  
 Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal
Longshore drift (sometimes known as longshore drift or littoral drift) is a geological process by which sediments such as sand or other materials, move along a beach shore, by the waves
The longshore drift from the east has brought material to the eastern side of the central groyne while the nearby reef has prevented deposition in quite the classical manner for such a position.
Jetties and groynes generally do not stop longshore drift, but interfere with it to the extent of retaining some of the beach material which might otherwise be removed.
www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=longshore_drift   (0 words)

  
 Longshore Current   (Site not responding. Last check: )
Longshore currents form because waves are continuous and, in most cases, approach the shore at an angle.
Longshore Current –; A current located in the surf zone and running parallel to the shore as a result of waves breaking at an angle on the shore.
Using the formulas given, calculate the speed of the longshore current for both trials, and then calculate the average of the longshore current today.
www.njmsc.org /Education/Lesson_Plans/Longshore_Current.htm   (889 words)

  
 longshore current and beach drift
Figure 1 illustrates that the direction of longshore current is a function of the angle of wave appoach.
But longshore current and the resulting transport of sediment is only one of the dynamic processes that constantly alters the shoreline.
Sediment transported by beach drift as well as that moved by longshore current together are called littoral transport.
faculty.gvsu.edu /videticp/longshore.htm   (540 words)

  
 Science Fair Projects - Longshore drift
In geography, longshore drift (LSD) (or littoral drift) refers to a process by which sediments move along a beach shoreline.
The process arises when waves approach the shore obliquely (which in turn is determined by factors such as prevailing wind and fetch).
Longshore drift is one of the principal processes in the construction of spits, bars and tombolos, and the overall sustainability of beach deposits.
www.all-science-fair-projects.com /science_fair_projects_encyclopedia/Longshore_drift   (307 words)

  
 IAG 1999 Regional Conference Abstract   (Site not responding. Last check: )
Each drift cell is based on net uni-directional longshore movement of sediments over a long period of time, in spite of any lesser, seasonal, movement in the opposite direction.
Drift cells may begin and end in broad, poorly defined zones, and may vary from tens of meters to scores of kilometres in length.
The systematic use of geomorphic and sedimentological indicators to determine net longshore drift cells along a coastline is a quick and accurate method with which to provide qualitative information to support an initial framework for coastal management decisions.
www.geomorph.org /sp/arch/br99/c11.html   (215 words)

  
 Light Hall ::: Geography ::: Pupils ::: Coastal Processes ::: longshore drift2
Longshore drift is the process by which the action of waves moves material along a beach or coastline.
Longshore drift supplies material to beaches along a coastline, making sure that the beaches are not eroded away by the action of the waves.
The reason for doing this (widening the beach) is to force the waves to break on the beach and not at the base of the cliff which would cause the cliff to collapse and recide.
www.school-portal.co.uk /GroupHomepage.asp?GroupID=34152   (276 words)

  
 Sitges Coastal Management Hypotheses
The smaller material is carried by the process of longshore drift to be deposited down-drift.
Assumption: (a) that longshore drift occurs and that some sections of the beach are more prone to sediment accumulation than others; (b) that some sections of the beach are subjected to high energy (destructive) rather than low energy (constructive) waves.
Assumption: (a) that longshore drift occurs and that some sections of the beach are more prone to erosion than others; (b) some sections of beach may be aligned with a longer fetch and more prone to erosion from high energy waves.
www.geographyfieldwork.com /coastal_management_hypotheses.htm   (467 words)

  
 Coastal Erosion on Cape Cod: Some Questions and Answers, Questions and Answerw
Longshore drift is the movement of sand grains along the beach by waves.
Longshore currents and longshore drift are generally considered to be constructive processes.
Sand carried southward along the north part of the barrier by longshore drift and longshore currents is swept into the lagoon by tidal currents.
woodshole.er.usgs.gov /staffpages/boldale/capecod/quest.html   (2582 words)

  
 Information About Tides - Ocean Current - Beach Erosion
When this happens it produces a current along the beach called a longshore drift which may consistently flow in one direction, or maybe the reverse depending on the wind.
The longshore drift runs parallel to the shore picking up sand with it as it goes.
Even though they have been successful in holding the fine sand on the bathing beaches, the beaches farther down are being deprived of their normal supply of traveling sand, and have been severely scoured and changed from sandy beaches to gravel or pebble ones.
gometaldetecting.com /ocean-tides.html   (846 words)

  
 Age determination of coastal submarine placer, Val'cumey, northern Siberia
Longshore currents transport and disperse the eroded sediments laterally along the shore from the top of Val’cumey Point toward the north.  Sediment transport is restricted to the surface layers of the near-shore zone, here termed the active zone.  High concentrations of tin are deposited as lenses of cassiterite (SnO
x=distance from the beginning of the lateral coastal drift, with the x-axis position in the drift direction and parallel to the shoreline.
The longshore drift velocity was estimated at the active placer tongue near the source of tin-bearing material at the cliff.  The estimated volume of sediment eroding from the source into the drift zone is about 3,000 m
www.answersingenesis.org /tj/v14/i3/placer.asp   (0 words)

  
 Surfrider Foundation USA - Coastal A to Z
Littoral Drift: Sand and courser material moved in the breaker and swash zones by waves and longshore currents along the shoreline.
Longshore Current: Current moving along (parallel to) the shore, generated by waves breaking at an angle to the shoreline.
Longshore Sediment Transport: Sediment transport along the beach (parallel to the shoreline) caused by longshore currents and/or waves approaching obliquely to the shoreline.
www.surfrider.org /whatwedo4b.asp   (3422 words)

  
 Florida Oceanographic Online - Barrier Islands
Longshore drift is the movement of sand parallel to the shore caused by the angle of the waves breaking on the beach.
Longshore drift can cause the beach to build out from the mainland, across the mouth of a shoreline indentation such as a bay or estuary.
Wave action and longshore drift reworked and enlarged the dune ridge into a barrier island.
www.floridaoceanographic.org /environ/bar_isl.htm   (569 words)

  
 drift - Search Results - ninemsn Encarta
Continental Drift, movement of continents relative to each other across the surface of the Earth.
Longshore Drift, movement of material along a beach resulting from waves approaching and breaking on the beach at an angle.
Wegener, Alfred Lothar (1880-1930), German meteorologist and geophysicist, noted chiefly for advocating the theory of continental drift at a time...
au.encarta.msn.com /drift.html   (137 words)

  
 Architecture- Clipart ETC
Marmagao Breakwater Breakwaters are structures on coasts as part of coastal defense or to protect an anchorage from the effects of weather and longshore drift.
San Vincenzo Breakwater Breakwaters are structures on coasts as part of coastal defense or to protect an anchorage from the effects of weather and longshore drift.
Sunderland Southern Breakwater Breakwaters are structures on coasts as part of coastal defense or to protect an anchorage from the effects of weather and longshore drift.
etc.usf.edu /clipart/galleries/Arts/architecture_2.htm   (1802 words)

  
 Light Hall ::: Geography ::: Pupils ::: Coastal Processes ::: longshore drift
Longshore drift is the movement of material along the shore by wave action.
Longshore drift happens when waves moves towards the coast at an angle.
Longshore drift provides a link between erosion and deposition.
www.school-portal.co.uk /GroupHomepage.asp?GroupID=34000   (273 words)

  
 The shoreline is where the sea meets the land
Describe longshore current and their significance to longshore drift of sand.
**Longshore current - a current of water that travels parallel to the coast due to the waves that break on the shore at an angle.
**Longshore drift of sediment - sediment is transported parallel to the shore by the longshore current.
www.nwic.edu /tenrm/spring2002/landgeol/objectivescoasts.htm   (827 words)

  
 Coastal Transportation
Swash aligned beaches are rare and Longshore drift is the movement of sediment along the beach.
This results in a zigzag migration of sediment along the beach by the processes of Saltation and Trachon called longshore drift.
Longshore drift is dependent on the wind direction E.g.
www.revision-notes.co.uk /revision/702.html   (384 words)

  
 Shorelines
Ø Longshore current and Longshore drift - As the waves approach the coast at an angle a current develops which moves parallel to the shore (longshore current).
Beach sediments move along with this current (longshore drift).
The longshore drift continues to deposit sediments parallel to the shoreline even when estuaries are encountered.
physics.uwstout.edu /IntroGeo/shorelines.htm   (817 words)

  
 Shore.html   (Site not responding. Last check: )
Longshore Currents - currents moving parallel to shore in the same general direction as the approaching waves.
They are produced by the movement of oblique waves in the surf zone, and can transport large amounts of sediment by longshore drift.
Sediment is transported along beaches by beach drift (zigzag motion of sediment particles in the swash and backwash of waves).
www.geo.ua.edu /intro03/Shore.html   (1649 words)

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