Extraction and spatio-temporal change analysis of the tidal flat in Cixi section of Hangzhou Bay based on Google Earth Engine

doi:10.6046/zrzyyg.2022021

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Abstract

At present, the common methods for extracting tidal flats using remote sensing images tend to estimate tidal flat boundaries. Therefore, it is difficult to ensure high extraction accuracy. This study combined remote sensing cloud computing platform Google Earth Engine with the geographic information system (GIS) technology and selected 77 Landsat images during 1990—2021. Meanwhile, the mean high-tide line was set to the artificial coastline obtained through visual interpretation, and the mean low-tide line was determined through the fitting of the shoreline. Based on these, this study extracted the tidal flat in the Cixi section on the south bank of the Hangzhou Bay and estimated its area. Furthermore, this study analyzed the spatio-temporal changes in the area of the tidal flat. The results are as follows. During 1990—2021, the area of the tidal flat in the Cixi section on the south bank of the Hangzhou Bay was roughly maintained in the range of 20 000~24 000 hm², and the tidal flat migrated from south to north at a speed of 286.9 m·a^-1. The main driving force behind the spatial and area changes of the tidal flat was local policies.

Keywords tidal flat Google Earth Engine DSAS shoreline Hangzhou Bay

ZTFLH:

TP79

Corresponding Authors: ZHOU Bin E-mail: 2017210214034@stu.hznu.edu.cn;zhoubin@hznu.edu.cn

Issue Date: 14 March 2022

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	Xiucheng ZHENG
	Bin ZHOU
	Hui LEI
	Qiyu HUANG
	Haolin YE

Cite this article:

Xiucheng ZHENG,Bin ZHOU,Hui LEI, et al. Extraction and spatio-temporal change analysis of the tidal flat in Cixi section of Hangzhou Bay based on Google Earth Engine[J]. Remote Sensing for Natural Resources, 2022, 34(1): 18-26.

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https://www.gtzyyg.com/EN/10.6046/zrzyyg.2022021 OR https://www.gtzyyg.com/EN/Y2022/V34/I1/18

Fig.1 Geographical location of the study area

Fig.2 Annually and monthly distribution of images

Fig.3 Technology roadmap for tidal flat extraction

Fig.4 Average low tide line extracted by DSAS module

Fig.5 Construction of buffers and sample points

Fig.6 Extraction results of tidal flat

Fig.7 Statistics of tidal flat area

Tab.1 Confusion matrix for evaluation of tidal flat extraction accuracy in 2021

Tab.2 Summary of evaluation results of tidal flat extraction accuracy

Fig.8 Spatio-temporal variation of geographical center of tidal flat

Tab.3 Migration of geographical center of tidal flat (m)

Tab.4 High (low) tidal line migration rate(m·a^-1)

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