1 edition of Tidal circulation and flushing characteristics of the Nauset Marsh System found in the catalog.
Tidal circulation and flushing characteristics of the Nauset Marsh System
Various interested bodies (i.e., National Park Servce, Cape Cod Commssion, and the Town of Orleans) charged with management of the Nauset Marsh system on Cape Cod, MA, commissioned a study of the estuarine circulation within the Nauset system. Recent signficant morphological changes in the system have changed mixing processes and residence times for the embayment. This study specifically addressed the differing water circulation and residence times arising from a migrating single inlet (dominant condition) and dual inlet (1992-1996) situations. These residence times are to be used by the Cape Cod Commission to identify nitrogen-sensitive sub-embayments based on various assumptions of build-out and nutrient loading. The Nauset Marsh system has experienced considerable development in recent years; proper management of this resource area requires knowledge of the consequences of such development. Application of field observations of bathymetry, sea surface elevation, temperature, salinity and currents, leads to better understanding the physics of the system. These data, analyzed in various forms, served as input data for a numerical, two-dimensional circulation model of the embayment. The circulation model provided flow and discharge data with which the residence times were calculated. Bathymetric measurements defined the volumes of the various sub-embayments to be used in the calculation of residence times. Residence times were calculated for six sub-embayments of the system, defined on the basis of their common hydrodynamic and morphologic characteristics. Two scenarios were evaluated: one for the present single-inlet system, which is near typical for most system states, and one for a dual inlet system such as existed for a period of time from 1992 through 1996. Residence times were evaluated for twelve cases, to demonstrate the range of residence times that can be defined based on varing assumptions. For instance, residence times can be defined on the basis of mean low water volumes or mean water levels, the latter being the more conservative (yielding a longer residence time). In addition, residence times depend on whether spring tides, neap tides, or average tidal conditions are used. We provide data on all three conditions: the neap tidal case is the most conservative in the sense of providing a longer residence time. This case can serve as the basis for flushing if conservatism is desired. Finally, residence time can be defined based on the amount of time it takes for water to renew itself with water from adjacent sub-embayments, or more conservatively assuming renewal from the offshore waters (which are presumed to be cleaner). Based on these various inputs, assumptions and calculations, residence times for Salt and Mill ponds under conditions of a single inlet are the longest of the various sub-embayments. Town Cove is still relatively quickly renewed, though not as fast as the main channels serving the system. Flow pattern under dual-inlet condition does seem to be partioned well, with the northern inlet serving the northern part of the system and the southern inlet serving the southern part of the system, with litte hydrodynamc communication between the two divisions. This new hydrodynamc behavior results in shorter residence times under dual inlets than under a single inlet. Calculations indicate that the slowest flushing occurs in Mill and Salt ponds. The main body of the embayment, consisting of narrow channels between well-flushed salt marsh and tidal flats, flushes rapidly. Two-dimensional calculations show that Town Cove also flushes relatively rapidly, on average. However, its greater depth and occasional temperature stratification create conditions which might accumulate nutrients in bottom sediments, which, when released, can cause decrease in water quality (such as plankton blooms). A more sophisticated low-trophic level ecosystem model combined with vertical hydrodynamic structure could clarfy the dynamics of this process. This study provides a defensible basis for evaluating nutrient loading and potential eutrophication arising from development in the watershed around Nauset embayment. However, since morphological changes occur on a rapid basis in this area, the issue of residence time should be re-examined periodically. For instance, rapid onshore migration of the southern barrier beach is threatening closure of the south chanel, a condition which could adversely affect water quality in Nauset Harbor in the near futue. A process should be established to examine the sensitivity of residence times for rapidly changing morphology.
|Statement||by David G. Aubrey ... [et al.].|
|Series||WHOI -- 97-11., WHOI (Series) -- 97-11.|
|Contributions||Aubrey, David G., Woods Hole Oceanographic Institution.|
|The Physical Object|
|Pagination||viii, 112 p. :|
|Number of Pages||112|
q=Aqp (1) length of a marsh channel is very small compared to a tidal wavelength and as- where q has the dimensions of volume per sures that the tidal slope will be small ullit time, A is the fret surface area inside within this system. The remaining assump- the section, and 72 is tidal stage. “Tidal Circulation and Flushing Characteristics of the Nauset Marsh System.” Woods Hole Oceanographic. Institution Technical Report, WHOI, pp. Oguz, T., P. Malanotte-Rizzoli, and D.G. Aubrey. “Wind and Thermohaline Circulation of the Black Sea Driven by Yearly Mean Climatological Forcings.” CIESM, Malta, March (abs.).
Home. A rapidly growing number of tidal marsh restoration projects are ongoing or in the planning stages throughout the Western United States. Pre and post restoration monitoring are critical components of any tidal marsh restoration project to assess project outcomes, evaluate whether objectives are being achieved, to support adaptive management decisions, and investigate the implications of. analyses that evaluated individual systems for general flushing characteristics. Residence times were calculated for each tidal creek and tributary, which then were classified using simple designations based on modeling output (ie. quickly flushed, intermediately flushed, slowly flushed). The initial focus was on shellfish growing areas (DSS, ).
in these marshes are semidiurnal with a strong diurnal inequality. Tides in this system are microtidal (mean tidal range, m), resulting in as much as 45 cm of marsh inundation during summer spring tides. The Florida marshes are vegetated almost exclusively by dense stands. Tidal circulation and flushing characteristics of the Nauset Marsh system. Report to the Town of Orleans. Woods Hole Oceanographic Institution Technical Report No. WHOI Woods Hole Oceanographic Institution, Woods Hole, Massachusetts pp. CrossRef Google Scholar.
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Environmental quality analysis
Tidal circulation and flushing characteristics of the Nauset Marsh System: report to the Town of Orleans Article (PDF Available) June with Reads How we measure 'reads'.
Tidal circulation and flushing characteristics of the Nauset Marsh System: report to the Town of Orleans. Tidal circulation and flushing characteristics of the Nauset Marsh System: report to the Town of Orleans.
View/ Open. WHOIpdf (Mb) Date Author. Aubrey, David G. Concept link Voulgaris, George: Concept link Spencer, Wayne D. Tidal circulation and flushing characteristics of the. WHOI Tidal Circulation and Flushing Characteristics of the Nauset Marsh System Report to the Town of Orleans June David G.
Aubrey, George Voulgaris, Wayne D. Spencer and. Tidal circulation and flushing characteristics of the Nauset marsh system. Woods Hole, Massachusetts: Woods Hole Oceanographic Institution.
Technical Report WHOI, p. Tidal Circulation and Flushing Characteristics of the Nauset Marsh System Report to the Town of Orleans by David G.
Aubrey, George Voulgaris, Wayne D. Spencer and Stephen P. O'Malley July Technical Report Funding was provided by the Town of Orleans, the National Park Service and the Andrew W.
Mellon Foundation. Tidal circulation and flushing characteristics of the Nauset Marsh System: report to the Town of Orleans commissioned a study of the estuarine circulation within the Nauset system.
Recent. A highly resolved, 3D model of hydrodynamics and Alexandrium fundyense in an estuarine embayment has been developed to investigate the physical and biological controls on a recurrent harmful algal bloom.
Nauset estuary on Cape Cod (MA, USA) consists of three salt ponds connected to the ocean through a shallow marsh and network of tidal channels. The model is. Tidal circulation and flushing characteristics of the Nauset Marsh System: report to the Town of Orleans Aubrey, David G.
; Voulgaris, George ; Spencer, Wayne D. ; O'Malley, Stephen P. (Woods Hole Oceanographic Institution, ). David G. Aubrey's research works with 3, citations and 3, reads, including: Persistent organic pollutants (POPs) in Caspian seals of unusual mortality event during and Tidal circulation and Flushing characteristics of the Nauset marsh system.
Woods Hole Oceanographic Inst. Tech. Rept., WHOIl. Google Scholar. Brosnahan, Brosnahan, M., Life cycle studies of the red tide dinoflagellate species complex Alexandrium tamarense. The lagoon is an almost closed water body connected to the open ocean through a meter deep, meter wide pass.
The Tiareroa pass is located on the north-west side of the atoll rim (Fig. 1b). Several very shallow hoa (about 30 cm deep, between 10 and meter wide, with a total cumulated width of 4 km), represent about 5% of the rim perimeter (77 km). Tidal discharge and area‐averaged current speed were measured over complete tidal cycles at the entrance to a salt marsh drainage system near Wachapreague, Virginia.
A pronounced asymmetry in curves of discharge and current speed through time was observed which can be simulated by a model incorporating semidiurnal tides and “overtides” in. Tidal marshes are productive ecosystems that serve as nursery grounds and habitat for aquatic organisms (Minello et al.,Minello et al., ) and food and habitat for many coastal environments, much of the primary production that occurs in tidal marshes is exported to adjacent waters in the form of detritus, which becomes a part of the estuarine food web providing.
River freshwater tidal marshes to determine if tidal restriction was present and whether restriction impacted water characteristics potentially affecting marsh development or fish habitat quality. Restriction was found to be present in two marshes, and the influence of restriction on ebb tide oxygen levels appeared to vary depending on.
Taiping Wang and Zhaoqing Yang, A modeling study of tidal energy extraction and the associated impact on tidal circulation in a multi-inlet bay system of Puget Sound, Renewable Energy, /,(), ().
Use the model to evaluate changes in tidal-flow, circulation, and flushing characteristics that might result if freshwater inflow were reduced or if the Sanibel Causeway were altered.
Data that were collected, analyzed, or published as part of the overall environmental assessment of Charlotte Harbor were used for this study. Tidal circulation and Flushing characteristics of the Nauset marsh system. Woods Hole Oceanographic Inst Tech Rept, WHOIl [Google Scholar] Brosnahan M.
Ph D thesis. Massachusetts Institute of Technology and the Woods Hole. Kings Bay is an estuary on the gulf coast of peninsular Florida with a surface area of less than one square mile. It is a unique estuarine system with no significant inflowing rivers or streams.
As much as 99 percent of the freshwater entering the bay originates from multiple spring vents at the bottom of the estuary. The circulation and flushing characteristics of Kings Bay were evaluated by.
Site characteristics are reviewed in Table 1 –.Introduced P. australis was more prevalent in restricted marshes than in the restored marshes (K.L. Dibble, personal observation). At restored marshes the increase in tidal flow and associated salinity over time has decreased the cover of introduced P.
australis and/or forced distributional shifts of the invasive plant toward the upland edge of.Tidal flushing refers to the systematic replacement of water in a bay or estuary as a result of tidal flow.
The ocean is assumed to be a sink for water discharged during the ebb and a source of new water carried in by the flood. Ketchum (a) broadly defined tidal flushing in terms of an exchange ratio (r) representing the fraction of water in a specified location that is replaced during a.
These experiments compare two inlet/estuarine systems (Nauset Inlet, MA and Wachapreague Inlet, VA) with different tidal responses. Nauset Inlet is characterized by strong harmonic growth, particularly of the M4 constituent, and an asymmetry favouring longer ebbs than flood (e.g.
Aubrey & Speer,).