Mapping coastal erosion at the Nile Delta western promontory using Landsat imagery |
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| Authors: | Mohamed E Hereher |
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| Institution: | (1) Department of Environmental Sciences, Faculty of Science at Damietta, Mansoura University, New Damietta, Egypt |
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| Abstract: | A set of six Landsat satellite images with 5–9 years apart was used in a post-classification analysis to map changes occurred
at Rosetta promontory between 1973 and 2008 due to coastal erosion. Spectral information were extracted from two multi-spectral
scanner (MSS) images (1973 and 1978), three thematic mapper (TM) images (1984, 1990, and 1999), and one enhanced thematic
mapper plus (ETM+) image (2008). To estimate the quantity of land loss in terms of coastal erosion, a supervised classification
scheme was applied to each image to highlight only two classes: seawater and land. The area of each class was then estimated
from the number of pixels pertaining to this class in every image. In addition, the shoreline position was digitized to address
retreat/advance pattern throughout the study period. Results showed that Rosetta promontory had lost 12.29 km2 of land between 1973 and 2008 and the shoreline withdrew southward about 3.5 km due to coastal erosion. Most land loss and
shoreline retreat occurred between 1973 and 1978 (0.55 km2/year and 132 m/year, respectively). Coastal protection structures were constructed successively at the promontory. These
structures have considerably contributed to reduce coastal erosion; however, they promoted downdrift erosion. |
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