Study of the spatial and temporal distributions of tidal flat surface sediment based on multitemporal remote sensing

Abstract

IntroductionThe ecological environment of tidal flats often changes due to tidal erosion and sedimentation. The distribution of tidal flat surface sediment is a natural reflection of the changes in the external dynamic environment, the spatial and temporal distribution pattern is of great significance.MethodsIn this study, the output structure of traditional convolutional neural network is combined with BP neural network. Meanwhile, four phases of Sentinel-2 multispectral images were collected and combined with field data from the Doulonggang tidal flat in Jiangsu Province, China, to construct the sediment composition inversion model.ResultsThe inversion accuracy was higher than 80% compared with the measured results. According to the inversion result, from 2017 to 2022, the surface sediment particle size of the tidal flat in Jiangsu varied seasonally and was coarse in summer and fine in winter. Additionally, the sediment composition tended to coarsen, showing an interannual change trend of increasing sand content and decreasing clay and silt contents.DiscussionThe above change of the sedimentary environment of the tidal flat may be caused by the decrease of fine grained sediment deposition, the introduction of exotic vegetation, the global sea level rise and the influence of human activities.

Evaluating the Impact of Engineering Works in Megatidal Areas Using Satellite Images—Case of the Mont-Saint-Michel Bay, France

“…Studies on the British flats such as the Wash, the Bristol Channel, and particularly Morecambe Bay also demonstrate the effectiveness of remote sensing for measuring long-term morphological change in the tidal flats [11]. Asian tidal flats such as the Korean coast [12], the coast of Jiangsu Province, China [13], or the Red River estuary in Vietnam [14] have been investigated more recently, and the studies show an interest in waterline methods or different classification methods. In France, the Arcachon Basin [15], the Baie des Veys [16] and the Mont-Saint-Michel Bay [17,18] have been extensively studied.…”

Evaluating the Impact of Engineering Works in Tidal Flats Using Time-Series Satellite Images – Case of the Mont-Saint-Michel Bay, France

“…2 Optical and radar remote sensing is particularly suitable for studying tidal flats [6][7][8]. Some areas have been deeply investigated such as the Wadden Sea [9][10][11], British flats such as the Wash, the Bristol Channel or Morecambe Bay [12], the Korean coast [13], the coast of Jiangsu Province, China [14] or the Red River estuary in Vietnam [15]. In France, the Arcachon Basin [16], the Baie des Veys [17] and the Mont-Saint-Michel Bay [18,19] have been extensively studied.…”