Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 292 for “"Estuaries"”.
-
Tidal distortion in shallow estuaries
… asymmetries in tidal currents. Flood-dominant estuaries are characterized by longer falling tides and stronger flood currents while ebb-dominant estuaries have longer rising tides and stronger ebb currents. The asymmetries are reflected in the non-linear growth of harmonics and compound tides …
-
Tidal distortion in shallow estuaries
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1984.
-
Nutrient dynamics in shallow tidally-dominated estuaries
Te Puna and Waikareao estuaries are shallow tidally-dominated estuaries in Tauranga Harbour located on the Bay of Plenty Coast, New Zealand. Tauranga Harbour is the site of a large commercial port surrounded by urban development. The primary aim of this thesis was to determine the variations of …
-
Copper speciation in estuaries and coastal waters
… ability of ligands that control Cu toxicity in estuaries and harbors, where elevated Cu concentrations have caused documented toxic effects on microorganisms, fish, and benthic fauna. I modified and improved a commonly used approach to determine metal speciation (competitive ligand exchange …
-
Long-term morphological response of tide dominated estuaries
Most estuaries of the world are influenced by tides. The tidal action is a fundamental mechanism for mixing river and estuarine waters, resuspending and transporting sediments and creating bedforms. The planform of tide-dominated estuaries is characterized by a funnel-shaped geometry with a high …
-
The Distribution and Reactivity of Organochlorines in Estuaries
In February 1997, the Governing Council of the United Nations Environment Programme initiated a protocol to reduce the risks to human health and the environment arising from persistent organic pollutants. The initial list of 12 families of organochlorine pollutants included polychlorinated …
-
Marsh-Exported Dissolved Organic Matter Fate in Estuaries
<p>Dissolved organic matter (DOM) is a significant driver of estuarine productivity and nutrient cycling. The colored component of DOM, chromophoric dissolved organic matter (CDOM), impacts coastal optical properties, ocean color, and light attenuation. While marshes are largely considered sinks …
-
Modification on the Schofield stochastic model for estuaries
… are being developed for the use of modeling estuaries. Schofield and Krutchkoff developed a one dimensional stochastic model to predict the concentration of twelve components, five biological and seven chemical. It was criticized because all the components had to be included in the model in …
-
Variation in the use of intermittently open estuaries by birds : a study of four estuaries in the Eastern Cape, South Africa
… was to describe the use of intermittently open estuaries (IOEs) along a section of the Eastern Cape coast by waterbirds, and the factors that influence avifaunal community composition in space and time. The study area consisted of four IOEs of varying sizes within a 40 km stretch of coastline in …
-
High frequency acoustic propagation and modeling in stratified estuaries
Acoustic propagation measurements are made in a highly variable and stratified estuary using high frequency transducers (120kHz) on tripods placed across the main channel of the river flow. The measurements are taken in the Connecticut River across several tidal cycles, when the flood tide causes a …
-
Denitrification response to nutrient enrichment in New Zealand estuaries
As coastal catchment land use intensifies, estuaries receive increased nutrient and sediment loads, resulting in habitats dominated by muddy organic-rich sediments. Nutrient processing and denitrification in estuarine sediments represent important ecosystem functions regenerating nutrients for …
-
Spectral Irradiance and Phytoplankton Community Composition In Blackwater Estuaries
… composition were examined in two South Carolina estuaries: Winyah Bay and North Inlet. In Winyah Bay, the composition of the phytoplankton community in CDOM-rich upstream regions of the estuary was distinct from low-CDOM downstream communities. Cryptophytes dominated when wind-induced mixing was …
-
COMPLEXATION AND PARTICLE-WATER INTERACTIONS OF NICKEL IN ESTUARIES
… interactions of Ni were investigated in three estuaries with contrasting pollution levels, hydrodynamics and geochemical characteristics. Samples of water and sediments were collected seasonally from the Tamar, Tweed and Mersey Estuaries. The chemical speciation of dissolved Ni was determined …
-
High Frequency Acoustic Propagation and Modeling in Stratified Estuaries
Acoustic propagation measurements are made in a highly variable and stratified estuary using high frequency transducers (120kHz) on tripods placed across the main channel of the river flow. The measurements are taken in the Connecticut River across several tidal cycles, when the flood tide causes a …
-
Mechanisms and variability of salt transport in partially-stratified estuaries
The variability of salt transport determines the variation of the length of the salinity intrusion and the large-scale density gradient in an estuary. This thesis contains three studies that address salt transport and the salt balance. The variation of salt transport with the depth, the …
-
Physical constraints on phytoplankton in estuaries and shallow coastal waters
Highly dynamic aquatic systems have often been reported to support actively growing populations of phytoplankton. The partially-mixed, macrotidal, temperate estuary Southampton Water is no exception, with reports of frequent temporal patterns of spring and summer maxima in algal biomass. During …
-
Estuaries as Sources of Methylated Arsenic to the North Sea
… were higher than MMA. The Humber and the Thames Estuaries both had sources of inorganic As, but As methylation within the estuaries was not significant. MMA and DMA in the estuarine plumes and the North Sea showed strong seasonality, with concentrations below detection in winter, and maximum …
-
Mechanisms and variability of salt transport in partially-stratified estuaries
The variability of salt transport determines the variation of the length of the salinity intrusion and the large-scale density gradient in an estuary. This thesis contains three studies that address salt transport and the salt balance. The variation of salt transport with the depth, the …
Page 1 of 15