Multi-temporal change detection of Seagrass beds using integrated Landsat TM and OLI imagery in Bahrain marine area for the last 30 years

Authors: Sabah Saleh Aljenaid*, Arabian Gulf University, Manaf Fadhel AlKuzaei, University of Brighton, UK , Ghadeer Mohd Redha Khadeem, Arabian Gulf University (AGU), Khalil Al-Wedaei, University of Bahrain (UOB), Mohammad Sulaiman Abido, Arabian Gulf University, Humood Abdulla Naser, University of Bahrain (UOB)
Topics: Environment, Geographic Information Science and Systems, Remote Sensing
Keywords: Seagrass, Change Detection, Bahrain, Landsat,
Session Type: Poster
Day: 4/5/2019
Start / End Time: 1:10 PM / 2:50 PM
Room: Lincoln 2, Marriott, Exhibition Level
Presentation File: No File Uploaded

Seagrass beds are present around Bahrain islands, mainly in the eastern and western subtidal waters. Seagrass is considered as important breeding and feeding grounds for many fish species, prawns, and the globally threatened green turtle as well as the endangered dugong whose population in the Arabian Gulf is the second largest in the world. Seagrass is under continuous threats from natural and anthropocentric pressures. In this study, Landsat TM and OLI imagery combined with field survey data, and ancillary data were used to investigate, map and detect the changes of Seagrass beds area surrounding Bahrain marine area for the last 30 years. The preprocessing techniques implemented on the data sets include, radiometric and atmospheric correction, masking, sunglint correction by using Lyzenga algorithm and applied on the same data and location, water column correction and unsupervised image classification using the K-mean method. In 1985 Seagrass with eleven different classes were mapped using Landsat 5. A total of 1393 Km 2 was estimated as a Seagrass class area, while 694 Km 2 was estimated as a mixed with Algae and Rock class. The Seagrass distributed over 2087 Km 2. In 2017 Landsat 8 /OLI was used to map the benthic habitat. Seagrass was estimated to cover 753 Km 2, and was founded mixed with Algae, and Sand, over an area equal to 668 Km 2. The final maps of the two dates (1985, 2017) revealed that the area of Seagrass beds was deteriorated, and more than 640 Km 2 were lost.

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