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Topic: Tidal estuary


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In the News (Thu 12 Nov 09)

  
  Estuaries 1
Estuaries are not always associated with drainage from land; but our understanding of estuarine dynamics was formed by pioneering research efforts in the lower reaches of rivers, and the definition of the term estuary is still often based on the assumption that the water of estuaries has to be diluted by freshwater.
In contrast, the circulation in an estuary is maintained by the large density differences produced by the salinity contrast between freshwater and oceanic water (or, in the case of the inverse estuary, by the salinity contrast between the hyper saline estuary and the open ocean).
The characteristics of the inverse estuary are: The salinity in the upper layer decreases towards the sea; the salinity in the lower layer increases towards the estuary head.
www.es.flinders.edu.au /~mattom/ShelfCoast/notes/chapter11.html   (5608 words)

  
 EPA > National Estuary Program > About Estuaries   (Site not responding. Last check: 2007-11-05)
An estuary is a partially enclosed body of water formed where freshwater from rivers and streams flows into the ocean, mixing with the salty sea water.
Estuaries and the lands surrounding them are places of transition from land to sea, and from fresh to salt water.
Although influenced by the tides, estuaries are protected from the full force of ocean waves, winds, and storms by the reefs, barrier islands, or fingers of land, mud, or sand that define an estuary's seaward boundary.
www.epa.gov /owow/estuaries/about1.htm   (1217 words)

  
 estuary   (Site not responding. Last check: 2007-11-05)
Estuaries are of immense importance and are frequently areas of high fertility and large phytoplankton and zooplankton populations.
An estuary is a semi-enclosed coastal body of water which has free connection with the sea, thus is strongly affected by the tidal action.
The term lagoon is the region between a barrier island or spit and the mainland, a slough is a shallow estuary with large areas of the bottom exposed during low tides, a salt marsh is a shallow tidal estuary protected from ocean waves and inhabited by plants and can withstand submergence.
darter.ocps.net /classroom/klenk/Estuary.htm   (1157 words)

  
 Mid-Hudson River Estuary
The distribution of tidal marsh communities and plants in the Hudson is influenced by surface water salinity during the growing season.
The open water and tidal wetlands in this 48 kilometers (30 miles) reach of the Hudson are regionally significant as spawning and nursery habitats and as a migratory pathway between the upper and lower estuary for anadromous and resident fish.
Constitution Marsh is a 161-hectare (400-acre) freshwater to brackish tidal marsh, dominated by narrow-leaved cattail emergent marsh; the remainder is intertidal mudflats and subtidal aquatic vegetation beds.
training.fws.gov /library/pubs5/web_link/text/mhr_form.htm   (5233 words)

  
 Nat' Academies Press, Problems and Opportunities in the Design of Entrances to Ports and Harbors Proceedings of a ...
Tidal range varies greatly throughout the U.S. The tide range in Gulf Coast estuaries is generally less than 2.0 feet, while tide ranges greater than 30 feet are common in Cook Inlet, Alaska.
Additionally, the inflow of fresh water is the means by which a tidal waterway purges itself of pollutants introduced by man, and variations in the freshwater discharge rate alter the extent of salinity intrusion, as shown for the Delaware estuary in Figure 6.
The salinity at the entrance to the estuary is that of seawater; and it decreases with distance upstream from the entrance.
www.nap.edu /openbook/POD094/html/115.html   (4974 words)

  
 CHAPTER 1
In cases where tidal range is in the order of the mean depth, the physics is non-linear.
At the mouth of the estuary near Portsmouth the average tidal range is 2.7m decreasing to 2.0m at Dover Point, increasing slightly to 2.1m at the mouth of Squamscott River (Short, 1992).
In this study, in order to resolve the wetting and drying on the tidal flats, the ADAM model (Ip et al., 1998) is chosen, which combines the two-dimensional wave physics with a porous medium beneath the sediment surface to simulate the wetting/drying process of the tidal flats on a fixed, high-resolution mesh.
www.geocities.com /dawn_saf/PhD_Thesis/ch1.htm   (1842 words)

  
 NYSDEC - Hudson River Estuary Basics   (Site not responding. Last check: 2007-11-05)
The Hudson estuary stretches 153 miles from Troy to New York Harbor, nearly half the river's 315 mile course between Lake Tear of the Clouds, its source in the Adirondacks, and the Battery at the tip of Manhattan.
The estuary's productivity is ecologically and economically valuable to much of the Atlantic Coast; key commercial and recreational species like striped bass, bluefish, and blue crab depend on nursery habitat here.
Tidal marshes, mudflats, and other significant habitats in and along the estuary support a great diversity of life, including endangered species like the shortnose sturgeon.
www.dec.state.ny.us /website/hudson/hre.html   (823 words)

  
 The Academy of Natural Sciences - Research - Patrick Center - Research Programs   (Site not responding. Last check: 2007-11-05)
We assessed the extent of tidal freshwater wetlands in the upper tidal Delaware River.
Although the current area of tidal freshwater wetlands is greatly reduced compared with their historical extent, the remaining wetlands may have an impact on the chemical form of nitrogen and phosphorus (e.g., oxidized forms versus organic forms) to the more saline portion of the estuary and the eventually the coastal ocean.
Compared to salt marshes in the lower estuary, tidal freshwater wetlands are some of the first aquatic habitats to be affected by runoff from the upper Delaware Basin watershed and large urban areas, and hence they could have a greater per-area impact on estuarine water quality.
www.acnatsci.org /research/pcer/drbc.html   (2415 words)

  
 [No title]   (Site not responding. Last check: 2007-11-05)
At the tidal scale, velocities were separated into their diurnal and semi-diurnal components using continuous wavelet transforms, which preserved the temporal variability of the velocity amplitudes.
Semi-diurnal tides (tidal amplitudes »ð 1m) are the prominent tides, though diurnal tides (tidal amplitudes »ð 0.4 m) are important as well. Atmospheric wind conditions are determined from a wind gage on an offshore NOAA buoy (Buoy 46029). The buoy is located approximately 35 km west of the mouth of the Columbia River estuary.
When the diurnal and semi-diurnal tidal elevation amplitudes are out of phase, the asymmetry in the two tides of the day are minimal during the larger tides, resulting in fluctuations in the horizontal density gradients showing up on the semi-diurnal velocity signature.
www.ccalmr.ogi.edu /~arun/adp_analysis_v3.doc   (6195 words)

  
 IUGG 2003 Scientific Program
The estuary is sandy and characterised, at low water, by intertidal sandflats and shallow channels and, at high water, by a well mixed, or partially stratified, water column.
The estuary is exposed to large waves from the North Atlantic but much of the wave energy is dissipated across a wide shoreface before waves reach the estuary mouth.
A testable hypothesis is that the landward transport of marine sand is due to tidal pumping associated with the time-velocity asymmetry of the tidal currents rather than to storm events.
www.olympus.net /IAPSO/abstracts03/JSP08/02/017608-1.html   (492 words)

  
 [No title]   (Site not responding. Last check: 2007-11-05)
In many systems, the interactions between a river and the ocean is not confined to the estuary itself, and extends into the continental shelf in the form of a fresh water plume.
The head of the Columbia River estuary is at Bonneville dam approximately 250 km upstream of the mouth of the Columbia River estuary knowledge of the system, enabling sustainable and eco-friendly management decisions.
Tidal forcings are determined from a NOAA tidal gage located inside the estuary (see Figure 1).
www.ccalmr.ogi.edu /~arun/cmwr_chawlaetal.doc   (4073 words)

  
 Fishing Locality Guide - Trinity Inlet Cairns Harbour - North Queensland - Australia   (Site not responding. Last check: 2007-11-05)
This magnificent tropical tidal estuary is home to such a diversity of fish, over 40 species are readily encountered, and is only 2 minutes away from the heart of Cairns.
This waterway is primarily a huge tidal basin (map) with no actual river flowing into it, and offers almost year-round action.
One of the golden rules of estuary fishing is to fish the deep water on slow moving tides, fish shallow water on fast moving tides.
www.fishingcairns.com.au /page3-7.html   (1185 words)

  
 Hudson River Estuary Management Action Plan Table of Contents   (Site not responding. Last check: 2007-11-05)
It is the intent of the Estuary Management Plan to identify and foster those uses of the estuary which utilize the estuary's many renewable resources and, while providing for appropriate uses that may permanently alter and cause significant impact to the ecosystem, to minimize any negative impacts associated with such uses.
The estuary's wetlands are currently regulated under the Freshwater Wetlands Act, Article 24 of the ECL from the Tappan Zee Bridge north and under the Tidal Wetlands Act, Article 25, of the ECL from the Tappan Zee Bridge south.
Although this portion of the river is tidal, it is largely freshwater and its fisheries are managed by the DEC Division of Fish and Wildlife.
unix2.nysed.gov /edocs/encon/hud_plan.htm   (18517 words)

  
 EPA > Water > Wetlands, Oceans and Watersheds > Oceans, Coasts and Estuaries > Partnerships > National ...   (Site not responding. Last check: 2007-11-05)
Estuaries are critical to the health of coastal environments and to our enjoyment of them.
EPA’s National Estuary Program was established by Congress in 1987 to improve the quality of estuaries of national importance.
This includes protection of public water supplies and the protection and propagation of a balanced, indigenous population of shellfish, fish, and wildlife, and allows recreational activities, in and on water, requires that control of point and nonpoint sources of pollution to supplement existing controls of pollution.
www.epa.gov /owow/estuaries   (274 words)

  
 Energy Resources: Tidal power
If one was built across the Severn Estuary, the tides at Weston-super-Mare would not go out nearly as far - there'd be water to play in for most of the time.
The largest tidal power station in the world (and the only one in Europe) is in the Rance estuary in northern France.
A barrage across an estuary is very expensive to build, and affects a very wide area - the environment is changed for many miles upstream and downstream.
www.darvill.clara.net /altenerg/tidal.htm   (736 words)

  
 San Francisco Bay References   (Site not responding. Last check: 2007-11-05)
Cheng, R.T., 1982, Modeling of tidal and residual circulation in San Francisco Bay, California: Proceedings for the Seminar on 2-D Flows, HEC Report, U.S. Army Corps of Engineers, Davis, July 1981, p.
Cheng, R.T. and Casulli, V., 1992, Dispersion in tidally averaged transport equation, in Prandle, D., ed., Dynamics and Exchanges in Estuaries and the Coastal Zone: Coastal and Estuarine Studies, American Geophysical Union, v.
Cloern, J.E., 1991, Tidal stirring and phytoplankton bloom dynamics in an estuary: Journal of Marine Research, v.
sfbay.wr.usgs.gov /~resmith/sfb_bib.html   (12347 words)

  
 GEOMORPHIC EVOLUTION OF A FRESH-WATER TIDAL ESTUARY DURING LATE QUATERNARY SEA LEVEL AND CLIMATE CHANGES   (Site not responding. Last check: 2007-11-05)
Variations in sedimentation style and in landform patterns indicate that changes in sea level and climate influenced the Late Pleistocene and Holocene evolution of the lower Mattaponi River, eastern Virginia, USA.
In the fresh-water tidal (FWT) section of the river, large wetlands with thick (>3m) mucky silt or clay lie inside sinuous meander bends.
Some wetlands may have formed as the channel migrated laterally, but most marshes accreted vertically, particularly at sites downstream of obdurate cliffs that influence the thalweg at high flows.
gsa.confex.com /gsa/inqu/finalprogram/abstract_55937.htm   (469 words)

  
 Need help fishing a tidal estuary/ river on the Fishing Forum
Need help fishing a tidal estuary/ river on the Fishing Forum
Ok guys I just found a sweet little river but it has many complications for one, they put up a dam on it a couple of years ago which caused it to turn to from a freshwater river to a tidal estuary.
In this river there are carp, catfish, striped bass, large and small mouth bass, perch, and sunfish.
www.fishing-forum.info /printthread.php?t=2993   (404 words)

  
 Need help fishing a tidal estuary/ river Freshwater Fishing General
Need help fishing a tidal estuary/ river Freshwater Fishing General
Re: Need help fishing a tidal estuary/ river
Send a private message to Fishing Forum Admin
www.fishing-forum.info /showthread.php?t=2993   (378 words)

  
 CT DEP: Table of Contents - Connecticut River Estuary and Tidal River Wetlands Complex
CT DEP: Table of Contents - Connecticut River Estuary and Tidal River Wetlands Complex
D. Dredging and the Disposal of Dredged Sediments
Connecticut River Estuary and Tidal River Wetlands Complex
dep.state.ct.us /olisp/ramsar/contents.htm   (65 words)

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