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Arabian Journal of Geosciences

, Volume 6, Issue 5, pp 1527–1535 | Cite as

Optical remote sensing of turbidity and total suspended matter in the Gulf of Gabes

  • Rim KatlaneEmail author
  • Bouchra Nechad
  • Kevin Ruddick
  • Fouad Zargouni
Original Paper

Abstract

Optical remote sensing was used to provide scientific information to support environmental management in the Gulf of Gabes that is located in the southeastern coast of Tunisia. This region is characterized by shallow continental shelf subjected to semi-diurnal tides. Industrial activities in this area since the early 1970s may have contributed to the degradation of the biodiversity of the ecosystem with eutrophication problems and disappearance of benthic and planktonic species. To assess the long-term effect of anthropogenic and natural discharges on the Gulf of Gabes, the optical environment of the coastal waters is assessed from in situ measurements of total suspended matter concentration (TSM), Secchi depth and turbidity (TU). This monitoring requires regular seaborne measurements (monthly), which is very expensive and difficult to obtain. The objective of the present study is the evaluation of the Moderate Resolution Imaging Spectrometer (MODIS) AQUA data compared with two sampling campaigns realized at the study area. To map turbidity data from MODIS images, a semi-empirical algorithm was applied at band 667 nm. This bio-optical algorithm has already been calibrated and validated on the Belgian coast. The validation of this algorithm on the Gulf of Gabes using in situ measurements of turbidity and remotely sensed turbidity obtained from MODIS imagery shows a correlation coefficient of 68.9%. Seasonal and annual average maps for TSM and TU were then computed over the Gulf of Gabes using MODIS imagery. The obtained results of TSM and TU from remotely sensed data are conformable with those obtained through the analysis of in situ measurements. Therefore, remote sensing techniques offer a better and efficient tool for mapping and monitoring turbidity over the whole region.

Keywords

Remote sensing Turbidity Total suspended matter Gulf of Gabes 

Notes

Acknowledgments

This study was funded by the Unit of Structure and Geologic Model of University of Sciences of Tunisia. Thanks are extended to the Tunisian Chemical Group GCT for their assistance in collecting the in situ measurement in the Gulf of Gabes. The NASA ocean colors product distribution teams at The Goddard Space Flight Center GSFC are acknowledged for the distribution of MODIS products. This study was carried out in collaboration with the BELCOLOUR-2 project funded by the Belgian Science Policy Office STERO program.

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Copyright information

© Saudi Society for Geosciences 2011

Authors and Affiliations

  • Rim Katlane
    • 1
    Email author
  • Bouchra Nechad
    • 2
  • Kevin Ruddick
    • 2
  • Fouad Zargouni
    • 1
  1. 1.Geology Department, Geomatic and Structural Geology UnitUniversity of Sciences, Mathematics, Physics and Naturals of TunisiaTunisTunisia
  2. 2.Management Unit of the North Sea Mathematical Models (MUMM)Royal Belgian Institute for Natural Sciences (RBINS) MUMM|BMM|UGMM GulledelleBrusselsBelgium

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