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Louisiana State University

1. Feng, Zhixuan. Hydrodynamic response to cold fronts along the Louisiana coast.

Degree: MS, Oceanography and Atmospheric Sciences and Meteorology, 2009, Louisiana State University

URL: etd-06102009-153456 ; https://digitalcommons.lsu.edu/gradschool_theses/3221 

Cold fronts play important roles in flushing water out of the Louisiana estuaries. This study is aimed at examining the impact of cold front passages on the hydrodynamics in autumn-winter-spring of 2006-2007, and tries to determine the geographic difference, correlation and relative importance of winds, tides, and river discharge on water level variability and flow field. The amplitude spectra of water level reveal that diurnal tides dominate most stations. Areas west of 91°W have relatively high semidiurnal tides. The subtidal fluctuations are mainly wind-driven. Only the station in the Atchafalaya River shows obvious response to the spring flood of the Mississippi/Atchafalaya Rivers. Coastal bays have different water exchange rates depending on their water body area and geomorphology. Five largest flushing events correspond to migrating extratropical cyclones with frontal orientation perpendicular to the coastline, suggesting that wind direction is one of the controlling factors in the flushing rate and total transport. Both alongshore and cross-shore winds may effectively induce bay-shelf exchange. Northwest/north winds appear to be the most effective wind forcing in driving water movement from bay to shelf. Strong cold fronts may flush more than 40% of the bay waters onto the shelf within a period less than 40 hours. The near-surface current on the Louisiana inner shelf is mainly wind-driven, but tidal forcing becomes more important in the sub-surface layers or in the vicinity of the coastline of shallow waters. A prevailing down-coast flow occurs 81% and 70% of the time at CSI-6 and CSI-3, respectively. Strong cold front events may disturb this down-coast flow system by inducing a 1- to 3-day up-coast flow. At CSI-6, the Mississippi river discharge has little influence in non-flood seasons. During the period of spring flood, however, the large amount of freshwater exerts significant barotropic and baroclinic forcings on the current field and reinforces the down-coast flow. The analytical model reveals that the amplitudes of water level variations induced by alongshore and cross-shore wind forcings have the same order of magnitude (i.e., 10-1 m), indicating that they play almost equally important roles in driving the subtidal water level variability inside the bays.

Subjects/Keywords: cold fronts; Mississippi and Atchafalaya River discharge; subtidal wind-driven oscillations; bay-shelf exchange; alongshore and cross-shore wind forcings; down-coast westward flow; Louisiana estuaries and inner continental shelf

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Feng, Z. (2009). Hydrodynamic response to cold fronts along the Louisiana coast. (Masters Thesis). Louisiana State University. Retrieved from etd-06102009-153456 ; https://digitalcommons.lsu.edu/gradschool_theses/3221

Chicago Manual of Style (16th Edition):

Feng, Zhixuan. “Hydrodynamic response to cold fronts along the Louisiana coast.” 2009. Masters Thesis, Louisiana State University. Accessed March 04, 2021. etd-06102009-153456 ; https://digitalcommons.lsu.edu/gradschool_theses/3221.

MLA Handbook (7th Edition):

Feng, Zhixuan. “Hydrodynamic response to cold fronts along the Louisiana coast.” 2009. Web. 04 Mar 2021.

Vancouver:

Feng Z. Hydrodynamic response to cold fronts along the Louisiana coast. [Internet] [Masters thesis]. Louisiana State University; 2009. [cited 2021 Mar 04]. Available from: etd-06102009-153456 ; https://digitalcommons.lsu.edu/gradschool_theses/3221.

Council of Science Editors:

Feng Z. Hydrodynamic response to cold fronts along the Louisiana coast. [Masters Thesis]. Louisiana State University; 2009. Available from: etd-06102009-153456 ; https://digitalcommons.lsu.edu/gradschool_theses/3221

2. Marquez, Mainara da Rocha Karniol. \"Morfodinâmica de um segmento da praia da Ilha Comprida, litoral sul do Estado de São Paulo\".

Degree: Mestrado, Oceanografia Química e Geológica, 2007, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/21/21133/tde-19072007-132207/  ;

A dinâmica de praia constitui conhecimento elementar em obras de engenharia e na compreensão da evolução costeira ao longo do Quaternário recente. Buscou-se avaliar a variação temporal de curto período da morfologia e do volume de sedimento em um segmento na porção sul da praia da Ilha Comprida, litoral sul de São Paulo. Os resultados permitiram algumas interpretações, tanto em escala diária, como sazonal. As morfologias e os volumes do trecho estudado apresentaram maior similaridade entre as campanhas de maio de 2005 e janeiro de 2006, com estágio morfodinâmico de praia dissipativa, e entre agosto e novembro de 2005, com estágio de praia intermediária do tipo banco e calha. As ondas de sul com alturas de até 1 m e período médio entre 7 e 8 s atuaram no processo de engordamento da praia emersa, enquanto que as ondas desta mesma direção com alturas a partir de 1,5 m e período médio entre 8 e 10 s exerceram papel erosivo. De forma inversa, as ondas de leste com até 1 m de altura e período médio entre 6 e 8 s exerceram papel erosivo e com até 1,5 m e período médio entre 6 e 7 s, papel deposicional.

The knowledge of beach dynamics is fundamental in any coastal engineering projects as well as in the coastal evolution comprehension during the Late Quaternary. The aim of this study is to evaluate the short-term variations in morphology and sediment volume in a beach segment located in the southern portion of the Ilha Comprida, southern coast of the state of São Paulo, Brazil. The results allowed us to get important conclusions on daily and seasonal variations in beach morphology and behaviour. The morphology and volume data show similarity between may/2005 and jan/2006, with dissipative morphodynamic state characteristics, as well as between aug/2005 and nov/2005, characterized by an intermediate morphodynamic state. Southerly waves reaching 1m high and mean period between 7 and 8 s acts on the emerged part of the segment in a depositional way as well as southerly waves higher than 1,5 m and period between 8 and 10 s cause erosion in the same part of the beach profile. Easterly waves act in an opposite way, with lower heights causing erosion and higher causing deposition.

Advisors/Committee Members: Mahiques, Michel Michaelovitch de.

Subjects/Keywords: alongshore transport; avaliação de curto período; Beach morphodynamic; cross-shore transport; Ilha Comprida; Ilha Comprida; Morfodinâmica de praia; short-term evaluation; transporte longitudinal; transporte transversal; variação de volume; volume variation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Marquez, M. d. R. K. (2007). \"Morfodinâmica de um segmento da praia da Ilha Comprida, litoral sul do Estado de São Paulo\". (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/21/21133/tde-19072007-132207/ ;

Chicago Manual of Style (16th Edition):

Marquez, Mainara da Rocha Karniol. “\"Morfodinâmica de um segmento da praia da Ilha Comprida, litoral sul do Estado de São Paulo\".” 2007. Masters Thesis, University of São Paulo. Accessed March 04, 2021. http://www.teses.usp.br/teses/disponiveis/21/21133/tde-19072007-132207/ ;.

MLA Handbook (7th Edition):

Marquez, Mainara da Rocha Karniol. “\"Morfodinâmica de um segmento da praia da Ilha Comprida, litoral sul do Estado de São Paulo\".” 2007. Web. 04 Mar 2021.

Vancouver:

Marquez MdRK. \"Morfodinâmica de um segmento da praia da Ilha Comprida, litoral sul do Estado de São Paulo\". [Internet] [Masters thesis]. University of São Paulo; 2007. [cited 2021 Mar 04]. Available from: http://www.teses.usp.br/teses/disponiveis/21/21133/tde-19072007-132207/ ;.

Council of Science Editors:

Marquez MdRK. \"Morfodinâmica de um segmento da praia da Ilha Comprida, litoral sul do Estado de São Paulo\". [Masters Thesis]. University of São Paulo; 2007. Available from: http://www.teses.usp.br/teses/disponiveis/21/21133/tde-19072007-132207/ ;

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