1 |
Laboratory studies on the ecophysiology of 'green tide' algae from Langstone Harbour, south coast of EnglandTaylor, Rebecca January 1997 (has links)
No description available.
|
2 |
Cruise tourism on the Baltic Sea and implications of water quality legislation : A case study on balancing the interests of the cruise industry and local economies with long-term environmental sustainabilityPolack Huamán de Duijvelaar, Sandy January 2012 (has links)
No description available.
|
3 |
AplicaÃÃo da Teoria Fuzzy em Modelos de Transporte de Massa para o CÃlculo do Risco na ConcessÃo de Outorga para LanÃamento de Efluentes em Rios / Application of Fuzzy Theory in Mass Transport Models for the Calculation of Risk in the Provision of Grant to Launch Effluent in RiversSÃlvia Helena Lima dos Santos 30 March 2012 (has links)
FundaÃÃo de Amparo à Pesquisa do Estado do Cearà / Este trabalho desenvolveu uma metodologia, com base na aplicaÃÃo da teoria fuzzy,
em modelos de transporte de poluentes, para estudar o risco fuzzy de
contaminaÃÃo, na concessÃo de outorga de lanÃamentos de efluentes em rios. Para
isso, as equaÃÃes diferenciais do modelo de transporte sÃo transformadas em
equaÃÃes diferenciais fuzzys, de modo que o campo de concentraÃÃes representado
pelo modelo matemÃtico seja transformado em campos de funÃÃes de pertinÃncias
de concentraÃÃes. O estudo se utiliza de parÃmetros definidos na lei para
estabelecer a classe do rio e, assim, calcular, para cada tipo de lanÃamento, o risco
de contaminaÃÃo e a capacidade de assimilaÃÃo do mesmo. Para a soluÃÃo do
modelo matemÃtico foi usado o mÃtodo das diferenÃas finitas, com esquema
implÃcito para o equacionamento das equaÃÃes das diferenÃas. Para a realizaÃÃo
das simulaÃÃes foi desenvolvido um programa computacional, em linguagem
FORTRAN que deu suporte na obtenÃÃo dos resultados para os mais diversos
cenÃrios propostos. Os resultados mostraram que a teoria fuzzy pode se tornar uma
alternativa segura no auxilio do controle de poluiÃÃo dos rios em geral, fornecendo,
assim, fundamentos para a gestÃo dos recursos hÃdricos / This research developed a methodology, based on application of fuzzy theory in the
pollutant transport models, to study the fuzzy risk of contamination, in awarding
grants for discharge of effluents into rivers. In such way, the differential equations of
the transport model are transformed into fuzzy differential equations, so that, the field
of concentrations, represented by the mathematical model is transformed into fields
of concentration membership functions. The study makes use of parameters defined
in the law to establish the class of the river, so that, it calculates, for each type of
release, the risk and its assimilative capacity of the river to receive effluents. For the
solution of the mathematical model the finite difference method was used, with
implicit scheme on order to get the difference equation. For the accomplishment of
the simulations a computational program, in FORTRAN language, was developed,
that gave support in the obtaining of the results for the most several proposed
sceneries. The results have shown that the fuzzy theory can become a safe
alternative to help control pollution of rivers in general, providing, in such way,
subsidies for resources management
|
4 |
The Effects of Eutrophication on Reef Health; A Study in Zanzibar, TanzaniaDunn, Jennifer Judith 04 1900 (has links)
<p> A study of two shallow fringing reefs off the coast of Zanzibar Island was conducted. The study site was Grave Island, 1 km off the shore of Zanzibar town. The comparison site was Chumbe Island, 10 km upcurrent of the town, adjacent a less densely inhabitated coast. The major anthropogenic stress on these reefs could be considered nutrient loading from sewage discharge.</p> <p> Studies of the sea urchin Diadema setosum, indicated mean densities at Grave Island of 6.4 urchins/m^2 and 1.2 urchins/m^2 at Chumbe Island. Urchin densities comparable to those at Grave Island have been related to overfishing and reduced coral recruitment. Coral associate densities were also considered with a mean density of 87/m^2 at Grave Island and 31/m^2 at Chumbe Island. High coral associate densities have been linked to structurally and physiologically weakened coral.</p> <p> Transect studies were conducted and suggested there were significantly reduced coral cover and reduced amounts of live coral at Grave Island (cf Chumbe Island). As well, coral species diversity was significantly lower at Grave Island than at Chumbe Island. Lowered species diversity suggests an unstable community structure, and reduced coral cover may indicate a faltering reef.</p> <p> Stable Isotope studies were conducted on tissue samples from both sites. They showed no significant difference.</p> <p> This study reflects the poor health of Grave Island. The high abundance of urchins and filter feeders, combined with reduced coral cover and diversity, suggest high nutrient loading on these reefs. The high abundance of urchins and associates also suggest coral mortality will be high and recruitment low. If these trends continue, it is unlikely the reef at Grave Island will be able to survive.</p> / Thesis / Bachelor of Science (BSc)
|
Page generated in 0.0409 seconds