Abstract
This study highlights the coastline position changes of Qingdao coastal area from 2000 to 2019, using GIS and remote sensing technologies through Digital Shoreline Analysis System and LANDSAT images. Understanding the coastline movement by suitable method is an important challenge for this extremely dynamic coast. The shoreline changes were statistically measured using three techniques, namely; Linear Regression Rate, End Point Rate and Net Shoreline Movement. For the automatic coastline extraction, different methods were applied, but among them most suitable techniques is the canny edge algorithm technique, which gives the accurate result. The result show maximum accretion reached was 266.07m/yr, 2391.85m,124.47m/yr for End point rate, net shoreline movement and linear regression rate, respectively. While, the maximum erosion was −142.55m/yr, −1234.59m, −63.22m/yr for End point rate, net shoreline movement and linear regression rate, respectively. This paper hence presents the monitoring processes of coast and analyzing the coastline change by the use of geospatial techniques that would be helpful for the coastal planning and management of the Qingdao coast. The applicability of the proposed model is tested with other generic edge detection algorithms that include; Sobel, Prewitt, and Robert edge detection techniques and it was concluded that our model outperforming in accurately detecting the coastline.
Highlights
The coastline is the meeting line of sea with land by the side of a definite tidal elevation point, that is one of the most significant landform as well as an essential attribute of earth surface, which might be changed in a very short period of time [1]–[4]
For this study the data is pre-processed by USGS and delivered level-one terrain-corrected (LIT) Landsat data in WGS84 geodetic datum, Universal transverse Mercator Map projection (UTM, Zone 51N), because of the LIT nature of the data the radiometric and geometric deformation were previously rectified before provision [59]–[61]
The natural processes owing to geomorphology and geology, the combined stroke of currents and waves, storms, tectonics and sea level fluctuation transform the coastlines
Summary
The coastline is the meeting line of sea with land by the side of a definite tidal elevation point, that is one of the most significant landform as well as an essential attribute of earth surface, which might be changed in a very short period of time [1]–[4]. Shore environment, which is prejudiced with marine as well as terrestrial forces and alters the coastal landforms. The coastal area generally focuses better economic, social and recreational opportunities [13]. It is of great significance for the economic development and natural environment, in spite of offering higher risk of natural disasters, like tsunamis, dangerous waves and coastal erosion [14].
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