Tidal estuaries. Medical search. Frequent questions

The study addresses critical uncertainties identified in the research, monitoring, and evaluation (RME) program for the Federal Columbia River Estuary Program (FCREP). (noaa.gov)
Hydrographic patterns and chlorophyll concentrations in the Columbia River estuary were compared for spring and summer periods during 2004 through 2006. (elsevierpure.com)
Baptista, António M. / Climatic and Tidal Forcing of Hydrography and Chlorophyll Concentrations in the Columbia River Estuary . (elsevierpure.com)
In the highly energetic Columbia River estuary, river discharge and tides are known as dominant factors controlling circulation. (mdpi.com)

This document presents potential products and methods for monitoring a suite of tidal wetland habitat indicators designated for the Montezuma Wetlands Project using remote sensing technology. (sfei.org)
Ahuriri Estuary Conservation Area sunset over the tidal wetland and saltmarshes at Westshore. (naturespic.com)
The estuary is recognised as a wetland area of international importance and is designated as a Ramsar site. (wikipedia.org)

Carbon (C) standing stocks, C mass balance, and soil C burial in tidal freshwater forested wetlands (TFFW) and TFFW transitioning to low‐salinity marshes along the upper estuary are not typically included in "blue carbon" accounting, but may represent a significant C sink. (stroudcenter.org)
These tidal river wetlands exhibited high N mineralization in salinity‐stressed forested sites and considerable P mineralization in low‐salinity marshes. (stroudcenter.org)
Slightly brackish coastal shores, estuaries, marshes. (maine.gov)
Shoaling of subtidal and intertidal mud flats has permitted tidal marshes to spread across large marginal areas of the San Francisco Bay estuary during the past several thousand years. (usgs.gov)
By 1850 A.D. the tidal marshes of the estuary, including those of the Sacramento - San Joaquin Delta, covered an area nearly twice as large as the area of open water. (usgs.gov)
Species distributions along leveled transects at six tidal marshes indicate that elevation and water salinity are the principal ecological factors that-control the distribution of seed plants in the remaining natural tidal marshes of the northern San Francisco Bay estuary. (usgs.gov)
Marshes near the seaward end of the estuary are typically occupied by 10-15 salt-tolerant species (e.g. (usgs.gov)
Spartina foliosa, Salicornia virginica), whereas marshes at the riverward end of the estuary are inhabited by as many as 30 species, most of which are known to tolerate moderate or small amounts of salt (e.g. (usgs.gov)
The Avocet ( Recurvirostra avosetta ) is an Annex 1 species and is present in internationally important numbers on the Thames Estuary and Marshes SPA. (pla.co.uk)
They are the most numerous species on the Thames Estuary and Marshes SPA. (pla.co.uk)
It overwinters in nationally important numbers on the Thames Estuary and Marshes SPA. (pla.co.uk)
They take the form of salt marshes, tidal forests, beaches and steep river mouths. (crosscut.com)

A comparison with other estuaries witnessing tidal bores indicates that the Hooghly experiences a strong bore, despite the high dissipative forces owing to the rapid convergence of river width. (civilengineering365.com)

The SSSI includes most of the foreshore upstream from Cardiff and Brean Down and most of the upper estuary as far as Sharpness. (wikipedia.org)
New estimates of bore intensity in the Hooghly are presented confirming that the bore Froude number may reach 1.37 in the upper estuary for higher tidal ranges. (civilengineering365.com)

5. Improved life-cycle models to account for the estuarine life histories of juvenile salmon and estimating the potential effectiveness of estuary restoration actions on the recovery and viability of selected salmon stocks. (noaa.gov)
The Ordnance Survey refers on its published mapping to a section of the estuary seaward of the two estuarine motorway crossings as the Mouth of the Severn. (wikipedia.org)
This is the third most numerous estuarine British wader, with an average population of 220,000, the mudflats of the Thames estuary are important wintering sites for this species. (pla.co.uk)
Located at the end of the Arroyo Burro County Beach Park parking area and within the Douglas Family Preserve, the project was designed to restore coastal estuarine, riparian and coastal sage scrub habitats, and improve water quality in Mesa Creek, the estuary, and at Arroyo Burro Beach. (scwrp.org)
That actually made the research harder to do because Brophy and her collaborators from the Pacific Marine and Estuarine Fish Habitat Partnership created maps using lidar and digital elevation models to estimate the historic extent of tidal wetlands. (crosscut.com)

The model-predicted hydrodynamic processes have been analysed in detail, both without and with the structures, including the discharge processes at key sections, the contours of maximum and minimum water levels, the envelope curves of high and low water levels, the maximum tidal currents, the local velocity fields around the structures and the mean power output curves. (pnnl.gov)
A simple model of open coastal dynamics is adapted to provide an analytic solution of the vertical and axial structure of tidal currents in an estuary. (yale.edu)
SPM and NOM) with the tidal currents, which could further provide information to assess organotin ecological risks accurately in estuaries. (njit.edu)

Growing in coastal salt marshlands and tidal estuary, Pauatahanui Inlet, Porirua City District, Wellington Region, New Zealand (NZ). (naturespic.com)
The Columbia River differs from the more tidally dominated coastal estuaries in the Pacific Northwest by its large riverine phytoplankton production and transfer of this biogenic material to the estuary and coastal ocean. (elsevierpure.com)
However, all Pacific Northwest coastal estuaries investigated to date have exhibited advection of coastally derived chlorophyll during the upwelling season. (elsevierpure.com)
This constitutes a fundamental difference between Pacific Northwest estuaries and systems not bounded by a coastal upwelling zone. (elsevierpure.com)

California's Central Valley and San Francisco Bay Estuary have a long history of mercury contamination from past mercury mining and gold extraction. (usgs.gov)

Data for a hydrodynamic model of tidal exchange of fish larvae in the estuary mouth region were collected concurrently with sampling and were used to model exchange of larval fishes over the neap and spring tidal cycle by extrapolating actual densities, using modelled tidal volume. (ajol.info)

Therefore a two-dimensional finite volume numerical model, based on an unstructured triangular mesh, has been refined to study the hydrodynamic impact and flood inundation extent, post construction, of all three of these proposed tidal power projects. (pnnl.gov)
Such interventions lead to a range of hydrodynamic and morphological responses (a changing channel depth, tidal amplitude and/or suspended sediment. (tudelft.nl)
The numerical results represent the evolutionary processes and hydrodynamic characteristics of tidal bores ranging from weak to strong intensities. (bioone.org)

The Severn Estuary (Welsh: Aber Hafren) is the estuary of the River Severn, flowing into the Bristol Channel between South West England (from North Somerset, Bristol and South Gloucestershire) and South Wales (from Cardiff, Newport to Monmouthshire). (wikipedia.org)
Definitions of the limits of the Severn Estuary vary. (wikipedia.org)
This definition is used by the Severn Estuary Partnership and Visit England. (wikipedia.org)
The Upper Severn Estuary SSSI covers the tidal river between Purton and Frampton on Severn. (wikipedia.org)
The Severn Estuary SSSI original designation involves the then counties of Somerset, Avon and Gloucestershire in England, and Gwent and South Glamorgan in Wales. (wikipedia.org)
The Severn Estuary SSSI designation overlaps individual site designations for separate sites in Avon (Spring Cove Cliffs, Middle Hope, Portishead Pier to Black Nore, Aust Cliff), Gloucestershire (Purton Passage) and South Glamorgan (Penarth Coast). (wikipedia.org)
The SSSI forms the major part of a larger area which includes the Taff/Ely Estuary and Bridgwater Bay (as well as the Upper Severn Estuary) The Upper Severn Estuary SSSI designation involves the English county of Gloucestershire. (wikipedia.org)
The site (Severn Estuary and Upper Severn Estuary) is listed in the 'Forest of Dean Local Plan Review' as a Key Wildlife Site (KWS). (wikipedia.org)
The Severn Estuary, located in the UK between south east Wales and south west England, is an ideal site for tidal renewable energy projects, since this estuary has the third highest tidal range in the world, with a spring tidal range approaching 14 m. (pnnl.gov)

Using a multifactorial approach that accounts for asymptotic evolution, this study examines and compares four marsh sites in the maximum turbidity zone of the St. Lawrence Estuary. (allenpress.com)
Recognition of this variability brings into question the generalizability of tidal marsh dynamics in large systems. (allenpress.com)
Ultimately, modelling the trajectories and predictability of future marsh evolution in large systems such as the St. Lawrence Estuary requires a multifactorial approach over multiple seasons and at multiple sites. (allenpress.com)
2002. The tidal marsh food web . (sfei.org)
The area in red shows the historical extent of tidal salt marsh. (crosscut.com)

Results from two salinity transects along the tidal Waccamaw and Savannah rivers of the U.S. Atlantic Coast show that total C standing stocks were 322-1,264 Mg C/ha among all sites, generally shifting to greater soil storage as salinity increased. (stroudcenter.org)
In summer, conversely, upwelling winds induced input of high-salinity water from the ocean to the estuary, and this water was often associated with relatively high chlorophyll concentrations. (elsevierpure.com)

It has one of the highest tidal ranges in the world - about 50 feet (15 m). (wikipedia.org)

Phytoplankton Blooms in Macro - Tidal Estuaries. (koeltz.com)
In both spring and summer seasons and among years, modulation of the spring/neap tidal cycle determined stratification, patterns of mixing, and the fate of (especially freshwater) phytoplankton. (elsevierpure.com)

This document can also serve as a starting place for the Technical Advisory Committee of the San Francisco Estuary Regional Monitoring Program (WRMP) to develop a set of regional protocols for monitoring the same or similar habitat indicators. (sfei.org)
2. Determine stock-specific habitat use, life histories, and performance of juvenile salmon in key habitat complexes to fill data gaps in the tidal fluvial reaches of the estuary (2012-2016). (noaa.gov)
4. A hydrological model quantifying the dynamics of rearing habitat opportunities for juvenile salmon at estuary reach and habitat scales. (noaa.gov)
The tidal Thames provides habitat to a wide range of important bird species, particularly overwintering and migratory birds. (pla.co.uk)
Restoration funds were focused on the Arroyo Burro Estuary because it was highly degraded in terms of water quality and wildlife habitat. (scwrp.org)
Most of the West Coast's estuary habitat has vanished, according to a new study, the most thorough of its kind. (crosscut.com)

When the EMP was created in 2004, most previous research in the LCRE had occurred in the lower estuary, closest to the river mouth in Reaches A and B. There was a considerable lack of research and monitoring within the tidal freshwater section of the LCRE, resulting in little basic understanding of habitats, fish use and food web dynamics in this region. (estuarypartnership.org)

Its very high tidal range, approximately 50 feet (15 m), creates valuable intertidal habitats and has led to the area being at the centre of discussions in the UK regarding renewable tidal energy. (wikipedia.org)
The tidal range results in the estuary having one of the most extensive intertidal wildlife habitats in the UK, comprising mudflats, sandflats, rocky platforms and islands. (wikipedia.org)
Black-tailed godwits ( Limosa limosa ) prefer muddy estuaries, where they feed on intertidal invertebrates, including molluscs, ragworms, crustaceans and earthworms, locating their food by sight and touch. (pla.co.uk)

The shape of the mountains and river mouths that border some estuaries might prevent the wetlands from moving farther inland as the shoreline recedes. (crosscut.com)

3. Monitor juvenile salmon life histories and their contributions to adult returns in selected estuary tributaries, including tributary examples where tidal habitats have been restored (2012-2018). (noaa.gov)
2. Estimates of variations in Chinook salmon stock composition and stock-specific growth, food habits, consumption rates, and bioenergetic efficiencies within selected tidal-fluvial habitats. (noaa.gov)
The estuary is recognised as a Special Area of Conservation (SAC) under the EU Habitats Directive. (wikipedia.org)
3. A determination of the variety of salmon life histories currently expressed in the estuary and habitats that support them (from Bottomet al. (estuarypartnership.org)
Estuaries are also among the most endangered habitats on the planet. (crosscut.com)

Swimming in tidal waters can be fun if you do your research and follow advice on swimming safely outdoors generally, in rivers and the sea, and especially in tidal rivers and estuaries. (outdoorswimmingsociety.com)
Swimming is banned or only allowed with special permission in some tidal rivers, such as the Thames below Putney Bridge. (outdoorswimmingsociety.com)
On the north-west (Welsh) side, the rivers Wye and Usk flow into the estuary, and on the south-east (English) side, the River Avon joins at Avonmouth. (wikipedia.org)
Estuaries form where fresh water from rivers and streams meets the salt water of the ocean. (crosscut.com)

This funnel shape, large tidal range, and the underlying geology of rock, gravel and sand, produce strong tidal streams and high turbidity, giving the water a notably brown coloration. (wikipedia.org)
This study investigated the concentration fluctuation of organotin compounds in the Turbidity Maximum Zone (TMZ) of the Yangtze Estuary within a tidal cycle. (njit.edu)

The tidal-fluvial estuary study is part of an ongoing estuary research program initiated in 2002. (noaa.gov)
The current study expands upon earlier research conducted in the lower 100 km of the estuary from 2002 to 2008. (noaa.gov)

The goal of the tidal-fluvial estuary study is to determine the estuary's contribution to the spatial structure and life history diversity of Columbia River salmon stocks and the implications for estuary restoration. (noaa.gov)
4. Evaluate estuary restoration needs for recovery of all salmon ESUs and account for projected effects of climate change through application of a salmon life-cycle model (2011-1015). (noaa.gov)

Riverine and oceanic sources of chlorophyll were evaluated at stations along a 27-km along-estuary transect in relation to time series of wind stress, river flow, and tidal stage. (elsevierpure.com)

Fresh water spring-fed tributaries ran into the saline estuary. (angelfire.com)

The model, despite using a vertically averaged velocity field, simulates tidal wave propagation and estimates of velocity magnitude during bore propagation with significant accuracy. (civilengineering365.com)

The methodology comprises interannual and intersite surface-height measures, sediment concentration values, tidal inundation frequency, relative sea-level data, and a weather activity index. (allenpress.com)
The sediment composition of the seabed governs its mobility, hence determining sediment transport and morphological evolution of estuaries and tidal basins. (tudelft.nl)
By studying the bed shear stresses and depth-averaged vorticities of the tidal bores, it can be concluded that the sediment incipience intensity grows nonlinearly in the second order with an increase in the tidal bore intensity, while the sediment transportation intensity grows linearly. (bioone.org)

Diel and tidal variations in density of larval fishes were monitored over one neap and one spring tidal cycle in the mouth region of the warm temperate Gamtoos Estuary, South Africa. (ajol.info)

Laura Brophy, an estuary ecologist at the Institute for Applied Ecology in Corvallis, Oregon, is one of the study's authors. (crosscut.com)

Organotin concentrations varied greatly during the tidal cycle with dissolved organotins ranged from 39 to 682 ng Sn·L −1 and 40-1588 ng Sn·L −1 , and particulate organotins ranged from 59 to 467 ng Sn·g −1 dw and 21-429 ng Sn·g −1 dw in TMZ water close to Hengsha Island and Jiuduansha Island, respectively. (njit.edu)
Greenhouse gas concentrations and physio-chemical water properties for the Clyde estuary in Scotland to support understanding of the GHG sources and. (data.gov.uk)

A tidal bore is a natural hydraulic phenomenon normally formed in funnel-shaped estuaries with large tidal ranges. (bioone.org)

Although all objectives will be addressed by 2018 to correspond with a review of progress implementing the FCRPS Biological Opinion, some sampling activities may extend beyond this date to allow brood-year reconstruction of estuary contributions to adult returns in selected streams (Objective 3). (noaa.gov)

These results will directly address information needs to support estuary actions specified in the Federal Columbia River Power System (FCRPS) Biological Opinion for the Columbia River. (noaa.gov)
Today, at the upstream boundary, the tidal limit of the river is at Gloucester Docks. (wikipedia.org)
During the highest tides, rising water is funnelled up the estuary into the Severn bore, a self-reinforcing solitary wave that travels rapidly upstream against the river current. (wikipedia.org)
Applied to the Hey River estuary in northern Queensland, the model provides an accurate representation of the four major tidal constituents. (yale.edu)
The area bounded in blue on the map shows the area covered by flood alerts and warnings for Isolated riverside properties on the tidal River Deben estuary. (riverlevels.uk)
The Lower Columbia Estuary Partnership's (Estuary Partnership's) Ecosystem Monitoring Program (EMP) is an integrated status and trends program for the Lower Columbia River and Estuary (LCRE). (estuarypartnership.org)
The analysis also reveals new information about bores in the Hooghly estuary, which may be useful for planning shipping and berthing operations in the port terminals along the river. (civilengineering365.com)
The river widens vastly and continues a further few km to its estuary. (angelfire.com)

The numerical simulations highlight the impact of riverbed asymmetry in bore appearances in natural estuaries. (civilengineering365.com)

Findings suggest that for some species, tidal exchange could escalate to millions of individuals over a single tidal cycle. (ajol.info)
This species is widespread in the Thames Estuary. (pla.co.uk)

Since the maps were created using the maximum reach of tides, and many urban areas have been built up from lower elevation levels, those no-longer-tidal areas weren't detected. (crosscut.com)

The UK Government recently invited proposals for tidal renewable energy projects from the estuary and many proposals were submitted for consideration. (pnnl.gov)

Safety precautions are essential when paddling in tidal waters in the evening, and it's best done with others. (sunjournal.com)

The number of European white-fronted geese over-wintering on the Thames Estuary SPA has decreased sufficiently to trigger a long-term Medium alert. (pla.co.uk)
1990). The Greater Thames Estuary Natural Area supports at least 5% of the wintering British population (English Nature, 1997). (pla.co.uk)

And houses were built on tidal flats. (crosscut.com)

The frequency, duration, and intensity of upwelling events varied both seasonally and interannually, and this variation affected the timing and magnitude of coastally derived material imported to the estuary. (elsevierpure.com)
Water levels and flow velocities change rapidly in both magnitude and direction when a tidal bore arrives. (bioone.org)

Downstream, the International Hydrographic Organization places the boundary between the estuary and the open sea of the Bristol Channel at a line between Sand Point, North Somerset (north of Weston-super-Mare) and Lavernock Point (south of Penarth in south Wales). (wikipedia.org)
West of the Wye, the estuary forms the boundary between Wales and England. (wikipedia.org)
A tidal bore generation scheme suited for a mesh-free numerical method is also proposed based on the SPH open boundary technique. (bioone.org)

Dunlin ( Calidris alpina ) feed in extensive muddy areas of estuaries on a wide range of invertebrate prey, including polychaete worms, gastropod snails, bivalves, crustaceans and occasionally small fish. (pla.co.uk)

The mapping project found that, today, less than 15% of historic estuaries remain along the Washington, Oregon and California coastlines. (crosscut.com)
Especially in bigger cities along the Southern California coast, estuaries have been filled," Brophy said. (crosscut.com)

This study attempts to fill this gap using tidal gauge and velocity observations supplemented with simulation results obtained using the open-source numerical shallow-water solver TELEMAC 2D. (civilengineering365.com)

Large numbers of preflexion gobiid larvae were recorded on this tide state, this behaviour serving to facilitate movement out of the estuary for gobies that undergo a marine phase in their development. (ajol.info)
The behaviour of tidal basins has been predicted using a modelling approach in which a morphological equilibrium for an entire basin was used frequently in the past. (tudelft.nl)

Many estuaries and tidal basins are strongly influenced by various human interventions (land reclamations, infrastructure development, channel deepening, dredging and disposal of sediments). (tudelft.nl)

Northern Ireland Water has used a range of NEC contracts on an ongoing EU-funded project to help enhance water quality in the two estuaries shared by Northern Ireland and Ireland. (neccontract.com)
The scheme aims to improve water quality in the shared estuaries of Lough Foyle in the north and Carlingford Lough in the east through the upgrade of key wastewater assets. (neccontract.com)
Water pollution was also an issue at the estuary, with a number of samples every year exceeding the State contact standards for bacteria. (scwrp.org)

The estuary had been greatly reduced in size (in the early 1900's the estuary was over 500 feet wide, and prior to construction was approximately 50 feet wide), and a large portion of Mesa Creek had been diverted into a cement culvert. (scwrp.org)

By best-fit analysis of the model results to data from three current meters, the vertical eddy viscosity for the estuary is estimated as 2.8 × 10 −3 m 2 s −1 , and the linear friction coefficient as 8 × 10 −4 ms −1 . (yale.edu)
Using the simulation results, key features of the Hooghly bore, such as the distance of the bore inception from the ocean mouth and the threshold tidal range for bore formation are investigated. (civilengineering365.com)

To determine whether HEV is present in mussels collected locally for human consumption, we examined 48 mussels from 5 tidal locations in Scotland. (cdc.gov)

San Francisco Estuary Institute: Richmond. (sfei.org)
San Francisco Estuary Institute: Richmond, Ca. (sfei.org)

Waterbirds such as shorebirds, waders, and ducks depend on healthy and productive estuaries to "fuel up" for long distance migrations along the Pacific Flyway. (usgs.gov)

AbstractThe study establishes, with the aid of field measurements and numerical modeling, that the upper reach of the Hooghly estuary (India), though damped, registers an intense tidal bore. (civilengineering365.com)

The biggest threat to estuaries today is sea level rise, in my opinion," said Karen Thorne, a research ecologist at the U.S. Geological Survey Western Ecological Research Center. (crosscut.com)

The lower estuary is amplified but does not show signs of bore formation. (civilengineering365.com)
This project expanded the Arroyo Burro Estuary by restoring the lower portion of Mesa Creek, planting native vegetation, and improving public access. (scwrp.org)

Organisms21

Chemicals and Drugs3

Analytical, Diagnostic and Therapeutic Techniques and Equipment1

Phenomena and Processes15

Disciplines and Occupations2

Anthropology, Education, Sociology and Social Phenomena2

Technology, Industry, Agriculture4

Health Care15

Geographicals7

Columbia River Estuary4

Wetland3

Marshes12

Witnessing tidal bores1

Upper estuary2

Estuarine5

Currents3

Coastal4

Francisco Bay Estuary1

Model of tidal1

Hydrodynamic3

Severn Estuary9

Marsh5

Salinity2

Highest tidal1

Phytoplankton2

Habitat6

Freshwater1

Intertidal3

Wetlands1

Habitats5

Rivers4

Turbidity2

20022

Restoration2

Transect1

Tributaries1

Wave propagation1

Sediment3

Neap1

Ecology1

Concentrations2

Ranges1

Streams1

River8

Asymmetry1

Species2

Tides1

Renewable1

Waters1

Thames2

Flats1

Magnitude2

Boundary3

Muddy1

California2

Observations1

Behaviour2

Strongly1

Water3

Greatly1

Results2

Scotland1

Richmond2

Productive1

Measurements1

Level Rise1

Lower2