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 27 for “"Tide Gauge"”.
-
Relative sea-level variations revealed by tide-gauge records of long duration
… In Part 1, twenty-eight of the world's longest tide-gauge records are examined for clues to the uncertain balance among factors contributing to relative sea-level (RSL) fluctuations. Obtaining these clues requires a description of t he data in terms of component functions, whether chosen for t …
-
The South African tide gauge network and its contribution to maritime safety
… study of climate change, sea-level rise and the tides effects on marine life is well known. However, little work has been done on the more technical aspects of tidal measurements and the use within maritime safety in accordance with international standards. This thesis will address the key …
-
Relative sea-level variations revealed by tide-gauge records of long duration
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1990.
-
A Feasibility Study of Dynamical Assimilation of Tide Gauge Data in the Chesapeake Bay
… dynamical assimilation of surface elevation from tide gauges is investigated to estimate the bottom drag coefficient and surface stress as a first step in improving modeled tidal and wind-driven circulation in the Chesapeake Bay. A two-dimensional shallow water model and an adjoint variational …
-
Towards a geoid consistent vertical datum in South Africa
… mean sea level (MSL) data, at one or more tide gauge station(s), followed by a precise levelling procedure to establish a network of benchmarks. Most countries around the world are still using mean sea level based vertical datums, and South Africa is not an exception. However, these …
-
Drivers of coastal sea level variability along the east and south of South Africa
… mean sea level records of seven individual tide gauges, from the east and south coast of South Africa were used to analyse the embedded timescales of variability. These timescales were separated through the Empirical Mode Decomposition (EMD) method. This is the first time that the EMD method …
-
Understanding the Effect of Internal Climate Variability on 20th Century Indian Ocean Sea Level: Results from Newly Reconstructed Sea Level Data
… understood primarily due to short and sparse tide gauge observations. Although satellite altimetry provides accurate basin-wide sea level measurements, trends computed from its relatively short (~27-year) data record are heavily influenced by interannual to multi-decadal variability. To …
-
The GPS Geodetic Infrastructure in the Puerto Rico and Virgin Islands Region and Its Applications for Faulting, Landslide, and Sea-Level Change Study
… positioning method. We performed a GPS, tide gauge, and satellite altimeter integrated sea-level change study in the PRVI and the whole Caribbean region. Our results show that current absolute sea-level rise rate along PRVI coasts is 1.7±0.3 mm/year, according to the tide gauge dataset …
-
Analysis of the spatio-temporal sea level variability in extreme regions using in-situ and satellite remote sensing data: South Shetland region (Antarctica)
… altimetric sea level anomaly products against tide gauge data showed that the agreement between satellite and in-situ measurements was highly sensitive to processing parameters and environmental conditions. Optimised settings, particularly the use of nine surrounding measurements to the …
-
Aspects of sea level variability in the southwest Indian Ocean and the east coast of Africa - (latitude 0-35°S and from the coast to 60°E)
Analysis of tide gauge sea level observations of varying durations in the southwest Indian Ocean and the East coast of Africa (Lamu, Mombasa, Zanzibar, Durban, Port La Rue and Port Louis) show variability which are related to global, regional time scales, local weather and climatic changes, …
-
Extreme sea levels around the coast of Southern Africa
Tide gauge data from ten ports around the coast of Southern Africa are used to study the nature and behaviour of extreme high sea levels with a view towards predicting the likelihood of extremes occurring in the future. A recorded sea level height can be thought of as a combination of an …
-
Tidal velocity asymmetries and bedload transport in shallow embayments
… elucidated here to enable one to determine from tide gauge data and sediment transport relations whether tidal asymmetry may cause net sediment transport. Tidal elevation and tidal velocity are related through the equations of motion of the fluid. If the estuary is shallow, the change in …
-
A comparison of the least squares collocation and the fast Fourier transform methods for gravimetric geoid determination
… vertical datum based on more than 100 years old tide gauge measurements of mean sea level (MSL). The LLD is poorly defined so an alternative is required. The SAGEOID10 (Merry, 2009) hybrid geoid model was computed for the purpose of replacing the existing vertical datum. Two gravimetric geoid …
-
Earthquakes and sea-level change in Hokkaido, north-east Japan
… unknown amount of this subsidence at the Kushiro tide gauge likely reflects anthropogenic activities associated with sediment compaction as well as mining-induced subsidence. An analysis of the tide-gauge records from Hokkaido show a more varied pattern of land motions, although they also confirm …
-
Regional Sea Level Rise Along the United States Coasts
… record. Prior to the satellite altimeter era, tide gauges must be used to study past sea level variability. Tide gauges suffer from sampling challenges that make regional studies difficult, and as a result, there has been relatively little discussion and few comprehensive efforts on reproducing …
-
Tsunami Excitation Estimation from Real-time GNSS
… DART buoys, and a global distribution of tide gauges. While these tools work well for tsunamis traveling teleseismic distances, saturation of seismic magnitude estimation in the near field can result in significant underestimation of tsunami excitation for local warning (Wang et al., …
-
Sea level variability and coastal trapped waves around southern Africa
… daily mean sea level data from 16 coastal tide gauges, as well as outputs of sea level anomalies from the Hybrid Coordinate Ocean Model (HYCOM) at a grid point closest to each tide gauge station under consideration. The observed records showed sea level variability dominated by the short …
-
Sea level variations and the impacts along the coastal areas of Nigeria
… subsidence has not been determined because the tide gauge benchmark have not been connected to a stable control point and monitored regularly. Maximum surges of the order of 7m were observed. Other variations and characteristics of the sea level on the Nigerian Coast include seasonal, tidal …
-
Spatio-temporal analysis of coastal sediment erosion in Cape Town through remote sensing and geoinformation science
… through a combination of Sentinel -1 GRD and tide gauge data. The accuracy, validation and correction of these elevation models was conducted at the pixel level by comparison to an in-field RTK GPS survey used to capture the current state of the beaches. The results depict a sediment deficit …
-
Expanding the stratigraphic record of tsunami inundation along the semi-arid, siliciclastic coast of north-central Chile
… (33.5°S), registering as much as 4.5 m on the tide gauge at Coquimbo (30.0°S) with run-up heights >10 m at a few exposed locations between Limarí (30.7°S) and Coquimbo. The tsunami provided an invaluable opportunity to examine the nature of tsunami deposit evidence in a semi-arid, siliciclastic …
Page 1 of 2