However, tidal flats are among the most highly vulnerable areas on Earth and are particularly sensitive to global changes. Because of this, tidal flats have received considerable attention from scientists in many parts of the world. Meanwhile, tidal flats provide habitats for migrating birds and are reserved land resources for urban sprawl with exploding populations. They play an irreplaceable role in coastline protection and biodiversity conservation, and against storm surges and other natural disasters. Tidal flats, which are areas between the mean low tide and mean high tide, serve as the most important coastal geomorphic systems in the coastal zone and are widely distributed in many coastal zones across the world, including the coast of England, the Wadden coast in Northern Europe, the Amazon River mud bank in French Guiana, the Gomso Bay in Korea, and the Chinese coast. Our findings will provide useful information for local managers and researchers to support future environmental management because increasing demand for land and rising sea levels are expected in the future.Ĭoastal zones are an important interface for the interaction between land and sea, and are also the most rapid and sensitive zones in response to global changes and various land and sea dynamics. In addition, the erosion of the tidal flats was associated with a reduced sediment supply. Land reclamation was the main factor affecting the reduction in the tidal flat area, as the reclamation area has increased by 1300 km 2, with an average of 35.14 km 2/year. We also found that the coastal tidal flats in the modern RSRs were generally undergoing erosion in the low tidal flats, especially in the Northern Swing and Southern Swing areas, while the high tidal flats showed a slowed accretionary change. The total tidal flat area in the study area showed an obviously decreasing trend overall, and approximately 992 km 2 of the tidal flat was lost. We found that the shoreline of the tidal flats showed an advanced seaward trend, and the waterline of the tidal flat presented a gradual process during different periods. Hence, we employed a novel remote sensing method by obtaining the instantaneous high/low tide line positions from over 112 scenes of Landsat satellite images of the study area from 1975 to 2017, which were used to track the recent evolution of the coastal tidal flats in the modern RSRs over the past four decades. However, a comprehensive understanding of spatiotemporal changes in tidal flats in RSRs remains lacking. ![]() These tidal flats play a critical role in coastline protection and biodiversity conservation, and against storm surges, but have recently been displaying drastic changes in geomorphic dynamics because of human activities. ![]() Each pixel was classified into tidal flat, permanent water or other with reference to a globally distributed set of training data.The coastal tidal flats of the modern Radial Sand Ridges (RSRs) are typical silt-muddy tidal flats in Central Jiangsu Province. The Murray Global Intertidal Change Dataset contains global maps of tidal flat ecosystems produced via a supervised classification of 707,528 Landsat Archive images.
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