Spatial-temporal variations of coastlines in Bohai Rim based on fractal dimension and their causes analysis

doi:10.3969/j.issn.1001-909X.2016.01.006

Abstract

Abstract: The coastline information of Bohai Rim in the year of 1980, 1990, 2000 and 2010 was extracted using remote sensing images of Landsat MSS, TM and ETM+ and GIS techniques, and the fractal dimension of the coastline was calculated by box-counting method. The characteristics of spatial-temporal variations of the coastline's length and the driving forces of coastline changes were assessed, and the relationship between the coastal development activities on various scales and fractal dimension changes were also discussed. The results showed that during the research period, the coastline length of the study area increased by 1 074.35 km and the rising intensity increased progressively. The coastline length entered a period of rapid growth after 2000. The most significant change of coastline length was found in Bohai Bay. During the study period, the coastline mainly expanded to the sea. Human development activities were the leading factor for coast change. Before 2000, coastal development was predominantly constituted by reclamation of aquaculture and salt fields; while after 2000, factors causing coastal change tended to become diversified and rates of harbor construction and construction lands increased. The fractal dimension of the overall coastline was increased steadily, indicating that the geometry of the coastline of the study area became more complex. The magnitude and variations of fractal dimension were directly related to material composition and evolution process in the coastal zone. A large numbers of coastal engineering construction of various scales were the leading factor in fractal dimension variation.

Key words: coastline, fractal dimension, spatial-temporal variations, GIS, remote sensing

CLC Number:

P737.1

XU Ning, GAO Zhi-qiang, NING Ji-cai. Spatial-temporal variations of coastlines in Bohai Rim based on fractal dimension and their causes analysis[J]. Journal of Marine Sciences, 2016, 34(1): 45-51.

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