Author(s): Zhan Hu; Shuai Liu
Linked Author(s):
Keywords: Tidal flats; Suspended sediment concentration; Morphological evolution; Remote sensing; China
Abstract: Recent global remote sensing studies have highlighted a substantial decline in tidal flats, but the mechanisms behind these changes are not well understood. To clarify this, we undertook an in-depth analysis of 2538 tidal flat transects across China to understand how their morphological features are influenced by factors such as suspended sediment concentration (SSC), tidal range, and wave height. Our research has shown that the width and slope of tidal flats are correlated with local SSC and tidal range, respectively. We also documented a nationwide reduction in the width of tidal flats from 2002 to 2016, which correlates with a decrease in SSC. Notably, we found that sediment-rich tidal flats are more sensitive to decreases in SSC compared to areas that are sediment-starving. However, when SSC levels increase, it is the sediment-starving areas that show a more immediate response. These varied reactions are attributed to the adaptive capacity of tidal flats to restore their morphological balance. This study provides crucial insights into the morphological dynamics of extensive tidal flats and underscores the importance of developing a national strategy for sediment distribution to protect these vital intertidal habitats.
Year: 2024