5 research outputs found
A comparison of robust polynomial fitting, global geopotential model and spectral analysis for regionalâresidual gravity field separation in the Doñana National Park (Spain)
Doñana National Park is a protected area of approximately 500 km2 located on the SW coast of Spain with
singular and interesting ecological and geological features. A gravimetric survey is presented where L&R
gravity metres were used in the gravimetric observations with GPS and high-precision levelling positioning.
Bouguer gravity anomalies were computed and least squares prediction was used for gross-error detection.
Robust polynomial fitting, the recent EGM2008 global geopotential model (complete to degree and order
2159), and spectral analysis were tested for regionalâresidual gravity field separation. A detailed description
of the gravimetric characteristics of the Doñana National Park is presented and the values of residual gravity
anomalies were correlated with geological features, where the use of the EGM2008 global geopotential model
has revealed an interesting tool for regionalâresidual gravity field separation. Finally, the interpretation of the
results is justified by the well-known geological aspects of the park, but some modifications in the boundaries
of the different geological features are needed in order to fit the modelled gravity with the residual gravity
anomalies in the two cross-sections analysed.The studies presented here were part of CICYT (Spanish Research Directorate) research project nos. HID 97-0321 and REN2001-1293. We would like to thank all UPC members participating in these projects and the staff from the Biological Station of Donana (CSIC), Palacio de Donana and Donana National Park. We remain deeply grateful for the fruitful discussion with Dr. Salvany and for the geological review of the manuscript.MartĂn Furones, ĂE.; Nuñez AndrĂ©s, M.; Gili, J.; Anquela JuliĂĄn, AB. (2011). A comparison of robust polynomial fitting, global geopotential model and spectral analysis for regionalâresidual gravity field separation in the Doñana National Park (Spain). Journal of Applied Geophysics. 75(2):327-337. https://doi.org/10.1016/j.jappgeo.2011.06.037S32733775