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• W2048676851 abstract "Substantial changes are taking place in the coastal landscape as a result of rapid urbanization. A series of environmental and resource problems have emerged owing to rapid urban development, including encroachment of agricultural land, land reclamation, silt deposition in rivers, and severe flooding. These problems have had a significant impact on sustainable development in Lingding Bay, the largest estuary of the Pearl River. This paper demonstrates that remote sensing can be effective in monitoring the dynamics of coastal zones, such as coastline movement, urban expansion, land-use changes, and migration of shoals and deep-water channels. Remote sensing data from 1978 to 1998 were used to detect the accelerating changes that have taken place in the study area. A hybrid approach has proved to be an effective way of improving remote sensing image classification, with multi-temporal compound imaging, for coastal change analysis. Geographic information system (Intergraph's modular GIS environment, MGE) software was used to assist planners in the analysis of such changes, by combining the maps from 1974, 1989 to 1997 and integrating the multiple (spatial and attribute) databases. The result demonstrates that: (1) the Pearl River estuary is being reclaimed, estuarine waterways are getting narrower; the area of water near Humen town has narrowed by 4–6 km; (2) shoals in Lingding Bay have reduced the area of water by 114 km2 over the past 23 years; the area of deep-water channels has declined by ∼24 km2, even with dredging; on average, the area of water has decreased by 5.9 km2 annually; western channels migrated eastwards 0.8 and 1.1 km during the first and second 10-year period, respectively; according to this scenario, the western channel will disappear from Lingding Bay in approximately 183 years; (3) land-use changes: 92% of shoal reclamation occurred in the 1980s and 80% of waterway reclamation happened during the 1990s; Panyu District of Guangzhou city leads the table in land reclamation, Zhongshan city is second, and Zhuhai city third; the area of reclamation in the last 10 years is slightly more (1.18 times) than in the previous 10 years, in particular, there was a 1.6- and 1.8-fold increase, respectively, for the Zhongshan and Zhuhai coastal regions; at the current rate of reclamation, Tangjia Bay in Zhuhai and Jiaoyi Bay in Dongwan will vanish in approximately 25 and 70 years, respectively; the decline of the bays will cause large-scale destruction of the aquatic environment—the consequences should not be ignored. The impact of such changes on flood control and prevention, and coastal planning, are also discussed. We stress the importance of regulating and controlling the long-term development of coastal areas in the Pearl River Delta." @default.
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• W2048676851 date "2005-01-01" @default.
• W2048676851 modified "2023-10-16" @default.
• W2048676851 title "Remote sensing and GIS-based integrated analysis of coastal changes and their environmental impacts in Lingding Bay, Pearl River Estuary, South China" @default.
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• W2048676851 doi "https://doi.org/10.1016/j.ocecoaman.2004.11.004" @default.
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