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Towards Identification of Environmentally Vulnerable Areas to Coral Bleaching Using Remote Sensing and GIS in the Coral Triangle

Barmawi, Muhammad (2009) Towards Identification of Environmentally Vulnerable Areas to Coral Bleaching Using Remote Sensing and GIS in the Coral Triangle.

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Abstract:The goal of this research is to test whether the bleaching vulnerability models (VM1 and VM2) that were developed in the Western Indian Ocean (WIO) gives satisfactory result when applied to the Coral Triangle compare against MaxEnt model (VM3). Coral bleaching observation data from Reefbase was used as the reference data. The environmental variable inputs to the models are sea surface temperature and its derived variables, chlorophyll-a concentration, photosynthetically active radiation (PAR), ultraviolet radiation, surface wind speeds, and ocean currents. Data collection and processing were done using distributed data access technologies. Model parameters for the WIO were applied to the environmental variables in the Coral Triangle. The same variables were used to model bleaching vulnerability using Maximum Entropy modeling. Model comparison was done by utilizing the Reefbase bleaching observation data. This research found the Reefbase bleaching observation data contains high variation because of the heterogeneous data sources. Chlorophyll-a and PAR showed negative relationship with the bleaching severity. The model outputs revealed that VM1 and VM2 models performed indifferently significance, but not to the VM3 model. The machine learning model provides better accuracy than model-based expert knowledge. Keywords: coral bleaching, marine protected area, vulnerability, Maximum Entropy, Western Indian Ocean, Coral Triangle, IDV.
Item Type:Essay (Master)
Faculty:ITC: Faculty of Geo-information Science and Earth Observation
Programme:Geoinformation Science and Earth Observation MSc (75014)
Link to this item:https://purl.utwente.nl/essays/93048
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