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What are Coastal Barriers? The principal danger to beaches and barriers is not intense storms but a steady reduction in the sand supply caused by dams on tributary streams and the diversion or interruption of littoral transport along the seaward edge of beaches and barriers by bulkheads, groins, and jetties. Spits and low-lying barrier beaches survive severe storms with relatively slight effects as long as there is a supply of sand available to restore the beach. Sometimes a spit is eroded back or shortened and the dunes reduced or moved, but the sand begins to build up again towards its equilibrium condition almost as soon as the storm ends. www.fws.gov /habitatconservation/cbra2.htm   (1327 words)

Apostle Islands National Lakeshore - Sandscapes of the Apostles (U.S. National Park Service) Sand spits are long, narrow sand deposits that extend outward from the tip of land or at the mouth of a bay. A large sand spit is found on the southern end of Outer Island and a smaller one can be found on the southern end of Cat Island. Sand deposits that connect an island to the mainland or two islands to each other are called tombolos. www.nps.gov /apis/naturescience/sandscapes.htm   (827 words)

WDNR - Apostle Islands Sandscapes State Natural Area Sand spits are long, narrow sand deposits extending outward into the water from a tip of land or at the mouth of a bay. Sand deposits that connect an island to the mainland or connect two islands are called tombolos. The southeast side of Raspberry Island is dominated by a sand spit and associated dunes and beach. www.dnr.state.wi.us /ORG/LAND/er/sna/sna268.htm   (442 words)

Lake Superior Coastal Zone - WI Coastal Wetlands Assessment Report Among the most distinctive and noteworthy are the freshwater estuaries and sand spits that characterize the southwestern Lake Superior shoreline, the wave carved sandstone cliffs of the northern Bayfield Peninsula and Apostle Islands, and the floristically rich “red clay” wetlands that occupy ancient lacustrine deposits. Extensive beds of emergent, submergent, and floating-leaved aquatic plants occur in the shallower waters of the estuaries, partially protected from wind, wave and ice action by the sand spits situated at the mouths of streams entering the lake. The larger sand spits typically contain beach, dune, and pine forest communities, and where the dunes are active interdunal swales support unusual assemblages of wetland plants. www.dnr.state.wi.us /org/land/er/publications/cw/Lake_Superior_intro.asp   (230 words)

Coasts Wave action turns the smooth valley sides into receding cliffs with sand spits and tombolos common. Barrier island coasts are those paralleled by deposits of sand separated from land by a lagoon. Sand and silt are the first to deposit while the mixing of fresh and salt water cause clay particles to bind together forming larger particles that settle to the bottom. www.uwsp.edu /geo/faculty/ritter/geog101/textbook/coastal_systems/coasts.html   (471 words)

Oregon Estuary Plan Book: Introduction, Estuaries in Oregon Except for the wide valley carved by the several rivers now feeding Tillamook Bay, and Nehalem Bay at the mouth of the winding Nehalem River, the estuaries on the north coast tend to be small, fed by streams which drain small watersheds, and enclosed in indentations between rugged headlands and sand spits. Along this portion of the coast, the mountains are mostly older marine sediments and sands, clays, and muds eroded from ancient mountains to the south and east. Bar-built: Others, like Sand Lake and Netarts Bay, are "bar-built," where a sand spit creates a separate estuarine environment which receives very little freshwater inflow. www.inforain.org /mapsatwork/oregonestuary   (932 words)

Welcome to Tweed River Entrance Sand Bypassing Project Website   (Site not responding. Last check: 2007-10-26) Issues addressed that were associated with dredging included: consultation, community information, sand removal and placement strategy, sand and water quality management, noise and vibration management, historic shipwreck management and accident and emergency responses. Sand from Letitia Spit is very clean, comprising mainly quartz grains and shell fragments. When this sand is first received at Snapper Rocks East, it may have a different appearance from the existing sand. www.tweedsandbypass.nsw.gov.au /enviromgt.html   (560 words)

Wikinfo | Sand Sand is a naturally occurring, finely divided rock, comprised of particles ranging in size from 0.063 to 2 mm. Sand is transported by wind or water and deposited in the form of beaches, dunes, sand spits, sand bars, and the like. Sand is often a principal component of the aggregate used in the preparation of concrete. www.wikinfo.org /wiki.php?title=Sand   (299 words)

Coasts Sand spits are anchored to coast off of natural or man-made projections, such as sea stacks or jetties. Sand spits grow downcurrent of the longshore current and are anchored to coast. Tombolos are sand spits that grow from the shore to an offshore land mass. www.coloradocollege.edu /DEPT/GY/rweb/coasts.html   (2413 words)

Sand Summary Sand is a naturally occurring, finely divided rock, comprising particles or granules ranging in size from 0.0625 (or 1/16) to 2 millimeters. The most common constituent of sand in inland continental settings and non-tropical coastal settings is silica (silicon dioxide), usually in the form of quartz which because of its chemical inertness and considerable hardness is quite resistant to weathering. Arkose is a sand or sandstone with considerable feldspar content which is derived from the weathering and erosion of a usually nearby granite. www.bookrags.com /Sand   (1628 words)

DNR - Coastal Dunes The sands were either eroded from glacial drift along the coast by wave activity or eroded from inland deposits and carried by rivers and streams. Sand, moved by waves and long shore currents, was blown up the steep faces of the moraines by on shore winds, accumulating along the summits and leeward sides, forming perched dunes. The sand wolf spider is adapted to extreme temperatures by living in a burrow deep under the sand. www.michigan.gov /dnr/0,1607,7-153-10370_22664-61314--,00.html   (2734 words)

Reach the Beach -- Wisconsin Natural Resources magazine, June 2004 Sand spits are found at Long Tail Beach in Brown County and Seagull Bar in Marinette County. Sand deposited during the last glacial advance was carried by longshore currents and slowed by the shallow U-shaped harbor. The ridges closest to the shoreline are the youngest. www.wnrmag.com /supps/2004/jun04/rock.htm   (1788 words)

Coastal Hazards and Climate Change - Appendix 3: The response of different coastline types to coastal hazards [New ... Sand exchange between the dunes and the beach is retarded by the growth of vegetation, which traps material. Sand can also be delivered to the beaches by rivers and streams, from cliff erosion, from neighbouring coastal areas by wave-driven littoral drift, from the breakdown of shells, and reworked ashore from offshore seabed sediments. Sand beach foreshores tend to be very flat, with slopes of 1:20 to 1:50 being common. www.climatechange.govt.nz /resources/local-govt/coastal-hazards-may04/html/page14.html   (2286 words)

WDNR - Apostle Islands Sandscapes State Natural Area Sand spits are long, narrow sand deposits extending outward into the water from a tip of land or at the mouth of a bay. Sand deposits that connect an island to the mainland or connect two islands are called tombolos. The southeast side of Raspberry Island is dominated by a sand spit and associated dunes and beach. www.wiparks.net /org/land/er/sna/sna268.htm   (442 words)

Mudflats and Beaches   (Site not responding. Last check: 2007-10-26) While sand and gravel beaches can be found in high wave energy environments, such as the western side of the Homer Spit, mudflats form only in low energy areas where finer sediments can settle, such as Mud Bay on the Spit's eastern side. Continuing west, gravel and sand spits and beaches are interspersed with rocky headlands (Sears and Zimmerman 1977). Although protected by the Homer Spit from swells and waves from the west, Mud Bay is exposed to winds from the head of the Bay. www.habitat.adfg.state.ak.us /geninfo/kbrr/coolkbayinfo/kbec_cd/html/ecosys/estuarin/mudflats.htm   (2593 words)

California's Beaches Most of the sand removed from winter beaches is deposited in offshore sandbars and is returned to the beach during the mild summer months by gentle swells that push the sand to the exposed shore. Barrier beaches and sand spits are also present along the coast at river mouths, bays, and lagoons; examples are Silver Strand Beach in San Diego, Zuma Beach in Malibu, and beaches at the Smith, Salinas, Pajaro, and Santa Maria River mouths. At low tide, water retained between the sand particles is filled with millions of microscopic diatoms and zooplankton upon which the buried bivalves feed, using long siphons that reach to the sand surface. ceres.ca.gov /ceres/calweb/coastal/beaches.html   (1159 words)

Beach Nourishment - Coastal Geology   (Site not responding. Last check: 2007-10-26) Barrier islands are elongate accumulations of sand that are separated from the mainland by open water in the form of estuaries, bays, or lagoons. The Pacific Coast, extending from Washington to California, is characterized by numerous short barrier spits that are elongate, primarily sand accumulations, generally connected to the mainland at a rocky headland. The principal factors involved in sand dune development are the presence and width of dry beach, and the abundance of sediment being supplied to the backshore areas. www.csc.noaa.gov /beachnourishment/html/geo/barrier.htm   (2596 words)

OC/GEO 103 Lecture 18   (Site not responding. Last check: 2007-10-26) Commonly engineered structures built to stabilize a section of the coast, or to prevent damage to coastal property, include jetties and groins (usually constructed perpendicular to the coast), seawalls and revetments (usually parallel to the coast), and breakwaters which tend to adopt a number of different configurations. Sand spits extend from and are attached to the shoreline and are formed by the movement of sediment by lonshore currents. Barrier islands are formed by large deposits of sand that is separated from the mainland by the water of estuaries, bays, and lagoons. oregonstate.edu /instruct/oc103/lec18.html   (269 words)

Alliance For The Great Lakes Forged by wind, water and vegetation in the presence of an abundant sand supply, dunes have graced the landscape of Michigan for a mere 3,000 to 4,000 years. Sand from river and longshore currents molded spits and sand bars, eventually closing off the bays from the lake. The pleasures are many...the silent ballet of marram grass shadows on the sand, the shriek of hawks soaring on the thermals over towering dunes, and the feel of warm beach sand as it slips across your fingers. www.lakemichigan.org /restoration/formation.asp   (861 words)

Snowy Plover People are their biggest threat; destroying nests in the sand by running over them with vehicles, allowing dogs to roam the beaches without a leash, and generally driving them away by seeking summer fun on the beaches. The beaches selected are generally open sand spits where they won't get trapped against driftwood piles or cliffs at high tide. One favorite winter spot is on the Bayocean sand spit at Tillamook Bay, Oregon, where a handful are usually found at the jetty - a 3 mile hike from the parking area. thebirdguide.com /sample/snpl.htm   (1214 words)

General Geology of Barnstable County, Massachusetts Later, as the sea drowned the glacial cape, the drift along the shoreline was eroded and re-deposited as beaches and spits. Winds carried the sand inland and to the top of sea cliffs, where it was re-deposited as extensive dune fields atop spits and dunes (fig. Spits, beaches, and dunes expand and are reshaped by major storms. nesoil.com /barnstable/barngeology.htm   (1463 words)

SAND Articles Sand is a granular material made up   (Site not responding. Last check: 2007-10-26) Sand is commonly divided into five sub-categories based on size: very fine sand (1/16 - 1/8 mm), fine sand (1/8 mm - 1/4 mm), medium sand (1/4 mm - 1/2 mm), coarse sand (1/2 mm - 1 mm), and very coarse sand (1 mm - 2 mm). It is called sharp sand in the building trade where it is preferred for concrete, and in gardening where it is used as a soil amendment to loosen clay soils. While the gorgeous white sands and sparkling emerald green waters are always the most memorable sight in Panama City Beach, you never have to leave this gorgeous view behind when you stay in a vacation home rental. amazines.com /Sand_related.html   (3255 words)

Lake Superior Coastal Zone - WI Coastal Wetlands Assessment Report Among the most distinctive and noteworthy are the freshwater estuaries and sand spits that characterize the southwestern Lake Superior shoreline, the wave carved sandstone cliffs of the northern Bayfield Peninsula and Apostle Islands, and the floristically rich “red clay” wetlands that occupy ancient lacustrine deposits. Extensive beds of emergent, submergent, and floating-leaved aquatic plants occur in the shallower waters of the estuaries, partially protected from wind, wave and ice action by the sand spits situated at the mouths of streams entering the lake. The larger sand spits typically contain beach, dune, and pine forest communities, and where the dunes are active interdunal swales support unusual assemblages of wetland plants. dnr.wi.gov /org/land/er/publications/cw/Lake_Superior_Intro.asp   (230 words)

Whatcom County CAO and SMP Update   (Site not responding. Last check: 2007-10-26) Many species such as surf smelt and sand lance depend on the integrity of the nearshore environment to provide them with habitat essential for sustaining their populations. Surf smelt and sand lance are forage fish species that rely on sheltered upper intertidal sand or sand-gravel beaches where they can spawn during high tide. Because surf smelt and sand lance spawn in the upper intertidal zone, spawning habitat for both fish populations are vulnerable to shoreline development. www.co.whatcom.wa.us /pds/shorelines_critical_areas/vtour10_5.jsp   (251 words)

Puget Sound Shorelines: Beaches - Sand Sand dollars, which feed on detritus, can become so dense that they form a strip along the shore visible from a plane. Several species of shorebirds often rest together in mixed flocks on the upper beach, sand spits, or beach grass. Beach hoppers or sand fleas can also be found here feeding on detritus (decaying plant and animal matter). www.ecy.wa.gov /programs/sea/pugetsound/beaches/sand.html   (374 words)

Flag Ponds Nature Park The beach at Flag Ponds was formed gradually as sand from beach ridges and sand spits accumulated over the last 2000 years. There are three conditions necessary to develop a cuspate foreland such as Flag ponds: sand, waves that move the sand in a predominate direction, and a place along the shoreline to receive large deposits of sand. Waves along Calvert County are predominantly from the north, generating a long shore current that moves to the south, carrying sand from the northern part of Calvert County. www.dnr.state.md.us /baylinks/14.html   (804 words)

Department of Geology and Mineral Industries Landslide hazards in Oregon In most mass movement, water plays a pivotal role by assisting in the decomposition and loosening of rock, lubricating rock and soil surfaces to enhance the beginning of movement, adding weight to an incipient landslide, and imparting a buoyancy to the individual particles, which helps overcome the inertia to move. The composition of slides is also very important, and the proportions of rock, sand, clay, and water will dictate the initiation, speed, and areal extent of each slide. The placement of buildings, to capture a spectacular view, on slide-prone coastal dunes, eroding headlands and sand spits, or at the edge of a receding shoreline, may lead to the loss of the structure. www.oregon.gov /DOGAMI/Landslide/Landslidehome.shtml   (530 words)

High-angle wave instability and emergent shoreline shapes: 1. Modeling of sand waves, flying spits, and capes For nearly symmetric wave climates (small net alongshore sediment transport), cuspate coasts develop that exhibit increasing relative cross-shore amplitude and pointier tips as the proportion of high-angle waves is increased. For asymmetrical wave climates, shoreline features migrate in the downdrift direction, either as subtle alongshore sand waves or as offshore-extending “flying spits,” depending on the proportion of high-angle waves. Numerical analyses further show that the rate that the alongshore scale of model features increases through merging follows a diffusional temporal scale over several orders of magnitude, a rate that is insensitive to the proportion of high-angle waves. www.agu.org /pubs/crossref/2006/2005JF000422.shtml   (417 words)

Mozambique: treasure islands - Telegraph The landscapes of Benguerra Island in Mozambique's Bazaruto Archipelago are stunning: on its eastern coast, massive sand-dunes tumble down to the breakers of the Indian Ocean on one side and to a series of freshwater lakes, inhabited by Nile crocodiles, on the other. To the north of the island, the sand flats are populated by migrant waders and the inlets are dotted with the triangular sails of small wooden dhows, which tack silently back and forth in a seascape that could be centuries old. To the south and west, sand spits and empty beaches ring the coastline. www.telegraph.co.uk /travel/main.jhtml?xml=/travel/2005/06/11/etmoz11.xml&page=1   (656 words)

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