The shoreline changes in Da Rang estuary area (Phu Yen) from multi-time remote sensing data

Abstract

The shoreline changes in the Da Rang estuary area from 2004 to 2019 were assessed in detail by the technique of shoreline extraction based on two indexes (AWEI - Automatic Water Extract Index and NDWI - Normalization Differentiation Water Index) from multi-time remote sensing data (ASTER, Landsat 5-TM, Rapid-Eye, Formosat 2 and SPOT 5) as well as the technique of calculating shortline changes (DSAS - Digital Shoreline Analysis System). The depositional trend on both sides of the estuary in the Southwest monsoon and the erosion in the Northeast monsoon were identified. In addition, the river-bed inside Da Rang estuary tends to be deviated to the North. In recent years, the river-bed in this area has been remarkably expanded and some of the sand dunes have almost completely disappeared.

Keywords: Shoreline changes, Landsat TM, Sentinel-2-MSI, RapidEye-5, Da Rang river