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 34 for “"Sandbar"”.
-
Modeling sandbar effects on nearshore waves and morphological change using SWAN
… variations in the bathymetry of an outer sandbar (in about 5-m water depth) on the nearshore wave field as the shallow (< 3 m) bathymetry changes from near alongshore uniform to strongly spatially variable to understand wave driven morphologic evolution. Waves were observed at Duck, NC …
-
Modeling Sandbar Effects on Nearshore Waves and Morphological Change using SWAN
… variations in the bathymetry of an outer sandbar (in about 5-m water depth) on the nearshore wave field as the shallow (< 3 m) bathymetry changes from near alongshore uniform to strongly spatially variable to understand wave driven morphologic evolution. Waves were observed at Duck, NC …
-
Relation of Missouri river flows to sandbar morphology with implications for selected biota
… historically braided large rivers, have reduced sandbars and associated highly productive habitats for riverine biota. Sandbars are an important interface between aquatic and terrestrial environments, i.e. an aquatic-terrestrial zone (ATTZ), within the main channel of the lower Missouri River. …
-
Observations and modeling of wave-acceleration-induced sediment transport in the surfzone
Onshore sediment transport and sandbar migration are important to the morphological evolution of beaches, but are not understood well. Here, a new model that accounts for accelerations of wave-orbital velocities predicts onshore sandbar migration observed on an ocean beach. In both the observations …
-
Observations and modeling of wave-acceleration-induced sediment transport in the surfzone
Onshore sediment transport and sandbar migration are important to the morphological evolution of beaches, but are not understood well. Here, a new model that accounts for accelerations of wave-orbital velocities predicts onshore sandbar migration observed on an ocean beach. In both the observations …
-
Use of main channel and shallow-water habitat by larval fishes in the lower Missouri River
… catch-per-unit-effort (CPUE) was higher within sandbar aquatic terrestrial transition zone (ATTZ) than main channel. Local-environmental factors accounted for the greatest proportion of variance in larval fish CPUE within sandbar ATTZ, followed by hydrologic and finally geomorphic factors at …
-
Geomorphic Assessment and Flow Modeling of Pearl Darter (Percina aurora) Habitat in the Pascagoula River Watershed
… commonly seen in alluvial stream systems are sandbars, which are dynamic and variable sediment structures that are known to have many associated species. One such species is the Pearl Darter, <em>Percina aurora</em>, a federally threatened species that only resides in the Pascagoula River …
-
Community Compostition and Microhabitats of Macroinvertebrates on Sandbars within the Lower Missouri River as a Food Source for Foraging Migratory Shorebirds
This study took place on 3 lower Missouri River sandbars near Columbia, Missouri during June 2004 to June 2005. The objectives of the study were to describe sandbar microhabitats and determine the abundance and distribution of macroinvertebrates and fish using these microhabitats as a source of …
-
Sediment Transport and Morphodynamics at an Estuary Mouth: a Study using Coupled Remote Sensing and Numerical Modelling
… of the driving forces that control the sandbar dynamics at the Teignmouth inlet system. The sandbars that form the ebb tidal delta are highly dynamic, leading to a cyclic morphological behaviour. Application of the numerical model (MIKE21 HD, NSW, ST) served two separate functions. The …
-
Cross-shore transformation of breaking random waves in the surfzone
… bottom stress is largest (up to 20%) for shallow sandbar crest depths. The majority of the energy transferred to the roller is dissipated internally, while 15% - 25% of the energy in breaking waves first is transferred to the roller and then diffused back to the water column. Internal dissipation …
-
Cross-shore Transformation of Breaking Random Waves in the Surfzone
… bottom stress is largest (up to 20%) for shallow sandbar crest depths. The majority of the energy transferred to the roller is dissipated internally, while 15% - 25% of the energy in breaking waves first is transferred to the roller and then diffused back to the water column. Internal dissipation …
-
Sandbars managed for least terns within the Missouri River: evaluating the influence of fish, spatial scale and environment on habitat use
… nest on barren sandy habitats, typically sandbars and shorelines within large river systems of the central United States. Loss of natural ecosystem processes which create and maintain these habitats is considered the primary reason for population decline and Federal listing of this …
-
Management and Mother Nature: piping plover demography and condition in response to flooding on the Missouri River
… piping plover (Charadrius melodus) uses riverine sandbars to breed. From 2004 to 2009, due to limited breeding habitat and low population numbers, the U.S. Army Corps of Engineers constructed 255 ha of sandbar habitat to benefit piping plovers and least terns (Sternula antillarum). During the …
-
Effects of surfzone wave transformation on swash dynamics
… the degree of wave energy dissipation over the sandbar crest. Under mild, near-constant offshore wave conditions, the presence of a sandbar and the tidally-controlled water depth over its crest determined whether most of the incoming waves broke before reaching the shoreline. This forced a …
-
Delination of Coastal Shark Habitat within North Carolina Waters Using Acoustic Telemetry, Fisher-Independent Surveys, and Local Ecological Knowledge
… Juvenile Dusky (Carcharhinus obscurus) and Sandbar (Carcharhinus plumbeus) Sharks were tracked using acoustic telemetry, and 12 of 15 tagged Sandbar Sharks were detected over an area from New York City to Savannah, Georgia. The spatial extent of potential juvenile Sandbar Shark habitat was …
-
Multi-scale modeling of the hydrodynamics, sediment transport, and morphodynamics in the nearshore
… model, hydrodynamics and morphodynamics during sandbar migration events at Duck, NC, USA were simulated under high-energy and low-energy incident waves. It was found that the model calculations of intense offshore-directed flow referred to as undertow is highly dependent on the wave roller …
-
Population Dynamics of Piping Plovers (Charadrius melodus) on the Missouri River
… On the Missouri River, piping plovers nest on sandbars, but the damming of the mainstem of the Missouri in the mid-twentieth century reduced the natural capacity of the Missouri River to create sandbar habitat. In 2004, the United States Army Corps of Engineers (USACE) implemented a habitat …
-
Distribution, Productivity, and Habitat Use by Interior Least Terns and Piping Plovers on the Niobrara River in Northern Nebraska, 1996-1997
… Niobrara River in early June of 1996 and 1997. Sandbar characteristics including total area and areas of high, low, wet sand, and heavy vegetation were obtained from the videography. Least terns and piping plovers were found along the entire portion of the Niobrara River monitored in 1996 and …
-
Zooplankton, Macroinvertebrate, Herpetile, and Ichthyofaunal Biodiversity of Riverine Habitat on the Upper Missouri River
… channels, main channel borders, main channels, sandbar complexes, tributary confluences, and vegetated islands. Zooplankton sampling consisted of replicate vertical tows with a plankton net. Macroinvertebrate sampling included a petite ponar dredge for the benthos as well as dipnet smapling. …
-
SENSITIVITY ANALYSIS OF WATER LEVELS AND WAVES IN THE CARMEL RIVER STATE BEACH TO CHANGING BOUNDARY AND MORPHOLOGICAL CONDITIONS IN DELFT3D: CARMEL RIVER LAGOON
… showed that the presence of a berm, or building sandbar, also increased the mean water level within the lagoon. Delft3D also captures simple dynamics of sediment transport and provides realistic results for sedimentation and erosion, as compared to the observations from March 2020.
Page 1 of 2