Projecte llegit
Títol: Desenvolupament de mètodes per minimitzar els efectes de salinity spiking en dades oceanogràfiques
Estudiants que han llegit aquest projecte:
TARRAGONA FORADADA, GERARD ALBERT (data lectura: 31-03-2009)- Cerca aquest projecte a Bibliotècnica
TARRAGONA FORADADA, GERARD ALBERT (data lectura: 31-03-2009)Director/a: QUESADA LOPEZ, RUBÉN
Departament: TSC
Títol: Desenvolupament de mètodes per minimitzar els efectes de salinity spiking en dades oceanogràfiques
Data inici oferta: 27-10-2008 Data finalització oferta: 27-05-2009
Estudis d'assignació del projecte:
| Tipus: Individual | |
| Lloc de realització: EETAC | |
| Segon director/a extern: Jaume Piera Fernàndez | |
| Paraules clau: | |
| Salinity, Spikes, microstructura, Processat del senyal, CTD | |
| Descripció del contingut i pla d'activitats: | |
| Aquest Projecte senmarca dintre del àmbit del processat de dades de sondes oceanografiques. Aquest tipus de sondes disposen de sensors de temperatura i conductivitat, entre daltres.
Les dades daquests sensors sutilitzen per poder realizar calculs com poden ser la salinitat o la densitat. Degut a que el temps de resposta dambdos sensors és diferent, es produeixen errors en els càlculs de salinitat i densitat. L'estudiant haurà de fer un estudi sobre les diferents tècniques proposades a la bibliografía per la reducció dels efectes del salinity spiking sobre dades oceanogràfiques. Posteriorment, haurà danalitzar la viabilitat dutilitzar aquestes eines amb dades procedents de sondes de microestructura. Finalment lalumne haurà de desenvolupar una eina específica que ens permeti els efectes del salinity spiking mantenint les singularitats de les dades de temperatura i conductivitat. |
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| Overview (resum en anglès): | |
| This Project is placed in the acquisition and processing field of oceanographic data extracted from several kinds of probes. This subject is getting more important day by day on the analysis of biological processes as well as aquatic environments such as oceans, lakes and coast areas. Oceanographic probes contain several sensors, such as temperature, conductivity, chlorophyll concentration and oxygen, and they obtain data for a later processing.
The project focuses on temperature and conductivity sensors. Their measurements provide data about other oceanographic quantities, like salinity and density. Depending on the desired application and the spatial features of the profile to measure, we can use low spatial resolution equipment (such as CTD probes) or higher spatial resolution equipment (e.g. microprofilers or microstructure probes). This project focuses on the last ones, due to the features of the water column to measure. Microstructure probes have high sensitivity and resolution, suitable for the measurements of profiles where spatial variables change quickly; for instance, environments of little depth. However, they have some drawbacks in reference to acquisition and data processing. Firstly, they are rather sensitive to the noise, which adds distortion and uncertainty on the measurement. On the other hand, another problem is the phenomenon named salinity spiking, which represents the main topic to study in this project. Salinity spiking is an effect arisen as a consequence of the fact that temperature and conductivity sensors have different response times. This mismatch causes error appearance in the computation of salinity and density parameters. Furthermore, it also causes troubles on the detection of turbulent zones or water mixtures. The main aims of the project are the analysis of existing correction methods for CTD probes, the study of correction methods for microstructure probes, the assessment of correction techniques for these probes and the creation and development of own methods which minimize salinity spiking effect in an oceanographic data profile. |
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