A methodology to estimate the residence time of estuaries

The residence time has long been used as a classification parameter for estuaries and other semi- enclosed water bodies. It aims to quantify the time water remains inside the estuary, being used as an indicator both for pollution assessment and for ecological processes. Estuaries with a short residence time will export nutrients from upstream sources more rapidly then estuaries with longer residence time. On the other hand the residence time determines if micro-algae can stay long enough to generate a bloom. As a consequence, estuaries with very short residence time are expected to have much lower algae blooms, then estuaries with longer residence time. In addition, estuaries with residence times shorter than the doubling time of algae cells will inhibit formation of algae blooms (EPA, 2001). The residence time is also an important issue for processes taking place in the sediment. The fluxes of particulate matter and associated adsorbed species from the water column to the sediment depends of the particle’s vertical velocity, water depth and residence time. This is particularly important for the fine fractions with lower sinking velocities. The question is how to compute the residence time and how does it depend on the computation method adopted.

Acompanhamento de obra: optimização de soluções: técnicas de cofragem (Atlântico Estoril Residence)

Relatório de Estágio para obtenção do grau de Mestre em Engenharia Civil na Área de Especialização de Edificações

Residence Model

Model layout of the 3 stage residence expansion to the university proposed in September of 1967. This was a revision of the original master plan which called for high rise residences east of the Tower rather then the sprawling residences shown here. Although modified slightly from the model, the first stage of the residence would become a reality in the form of the Decew Residence. The realization of the second stage would also eventually take place when the Gordon and Betty Vallee Residence was constructed.

Residence Model

Model layout of the 3 stage residence expansion to the university proposed in September of 1967. This was a revision of the original master plan which called for high rise residences east of the Tower rather then the sprawling residences shown here. Although modified slightly from the model, the first stage of the residence would become a reality in the form of the Decew Residence. The realization of the second stage would also eventually take place when the Gordon and Betty Vallee Residence was constructed.

Decew Residence Construction

The Decew Residence was the first on-campus residence constructed and replaced the temporary student residences on Glenridge Avenue at the base of the escarpment. The Decew residence accommodated 400 students, and included a 300 seat dining hall, 10 activity rooms and 5 student lounges. Construction completed in 1970.

Decew Residence Construction

Construction work continuing on the Decew Residence.