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Thesis (M.S.) in Earth Sciences--University of Maine, 2008. / Includes vita. Includes bibliographical references (leaves 93-98).

Thesis (M.S.)--Brigham Young University. Dept. of Geology, 2005. / Includes bibliographical references (p. 37-40).

Thesis (doctoral)--Université de Rennes 1, 2005. / Includes bibliographical references. Also available on the World Wide Web.

Thesis (M.E.)--University of Canterbury, 2007. / Typescript (photocopy). Includes bibliographical references (leaves 133-135). Also available via the World Wide Web.

The thesis aims to reconstruct the Holocene sea-level history in Bangladesh. Detailed litho-, bio-, and chrono-stratigraphic techniques have been applied to elucidate the nature of sedimentary sequences in association with the events of the Holocene marine transgressions and regressions. Samples have been collected from two separate sites, one at Panigati near Khulna and another at Matuail near Dhaka. The study shows evidence of five periods of marine transgression, each followed by a regression, during the Holocene. Each minerogenic sediment layer indicates a marine episode and these sediments were deposited under intertidal to estuarine conditions; each peat layer is in situ and indicates a retreat of the sea. It is difficult to separate the eustatic components contributing to these relative sea-level movements, although processes operating locally and regionally are clearly evident. Two separate sea-level curves, together with possible error ranges, have been proposed for Bangladesh; since the early mid-Holocene, an average relative sea-level rise of 1.07 mm. yr -1 has been estimated. The reconstructed sea-level curves show that during the early and mid-Holocene both sedimentation and subsidence rates were much lower than during the last millennium. Differential spatio-temporal progradation and coastline movements have also been evident. The Ganges and Brahmaputra rivers have provided a continuous sediment supply but their convergence is only of recent origin. A possible hypothesis of two separate estuarine systems for these two rivers has been put forward.

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Sea level and the alongshore component of wind stress data at seven locations on the Pacific coast of Canada and the United States were analyzed. The effective data period was from August 1, 1973 to September 9, 1975. The seven locations were Tofino, British Columbia; Neah Bay and Toke Point, Washington; South beach (Newport) and Charleston, Oregon; and Crescent City and San Francisco, California. Sea level relative to the two year mean is higher at the northern locations during the winter months than it is at the southern stations. There appears to be an annual cycle in the sea level though the amplitudes are different for the two years. The monthly mean wind stress is northward during the winter months, and has a larger value at the northern locations. During the spring and summer the monthly mean wind stress is southward and has a larger value at the southern stations. Linear correlation analysis was performed on the sea level data and on the alongshore component of wind stress for the entire time period and seasonally. Auto-correlations and cross correlations were computed for the adjusted sea levels and wind stress. This analysis shows that the sea level and wind stress fluctuations among these seven locations are coherent. These show that the correlation is a function of location and that it has a seasonal variation. It also appears that by examining plots of correlation coefficients and of sea level slopes, that the region may be divided into two major regimes. This separation might be interpreted as the locale where the West Wind Drift impinges on the coast. / Graduation date: 1978

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