A study on the changes in coastal tidal flats in the Laizhou Bay based on MSIC and OTSU

LI Yi; CHENG Lina; LU Yingying; ZHANG Bochun; YU Sen; JIA Mingming

doi:10.6046/zrzyyg.2022182

2022 Vol. 34, No. 4

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Article navigation > Remote Sensing for Natural Resources > 2022 > 34(4): 68-75

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LI Yi, CHENG Lina, LU Yingying, ZHANG Bochun, YU Sen, JIA Mingming. 2022. A study on the changes in coastal tidal flats in the Laizhou Bay based on MSIC and OTSU. Remote Sensing for Natural Resources, 34(4): 68-75. doi: 10.6046/zrzyyg.2022182

Citation:

LI Yi, CHENG Lina, LU Yingying, ZHANG Bochun, YU Sen, JIA Mingming. 2022. A study on the changes in coastal tidal flats in the Laizhou Bay based on MSIC and OTSU. Remote Sensing for Natural Resources, 34(4): 68-75. doi: 10.6046/zrzyyg.2022182

A study on the changes in coastal tidal flats in the Laizhou Bay based on MSIC and OTSU

1. School of Surveying, Mapping and Exploration Engineering, Jilin Jianzhu University, Changchun 130118, China；
2. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China；
3. College of Earth Science, Jilin University, Changchun 130061, China；4. Changchun New District Beihu Yingcai School, Changchun 130000, China

Received Date: 09 May 2022

Revised Date: 15 December 2022

Publish Date: 27 December 2022

Abstract

Abstract

Coastal tidal flats, as a major type of coastal wetlands, have significant ecological value in maintaining biodiversity and influencing global climate and environmental change. Since they are only exposed in their entirety at the lowest tide, the previous remote sensing interpretation results showed significant omissions and misclassifications of the tidal flats. Based on the Google Earth Engine (GEE) platform and the Landsat series satellite data, this study constructed high-quality dense time series image stacks for four time periods, i.e., 1990, 2000, 2010, and 2020. Then, these image stacks were combined with the maximum spectral index composite (MSIC) algorithm and the Otsu algorithm (OTSU) for rapid and automatic extraction of coastal tidal flats resources in Laizhou Bay of China. Furthermore, the land cover around the coastal tidal flats was delineated based on the object-oriented analysis technology and the fuzzy-based segmentation parameter (FbSP) optimal scale. Finally, the spatial and temporal evolution patterns of the coastal tidal flats were analyzed. The results are shown as follows. During 1990—2020, the coastal tidal flats in Laizhou Bay gradually decreased, with an area of 822.38 km2 in 2020, a reduction of about 40% compared with that in 1990. The largest reduction was 304.78 km2 during 2000—2010. The coastal tidal flats near the Yellow River estuary showed a seaward migration, while the coast tidal flat patches in other regions of Laizhou Bay showed a landward migration. Human activities were the dominant factors in the changes in tidal flats in Laizhou Bay in the past 30 years. Among them, the expansion of aquaculture ponds/salt fields directly encroached on 414.20 km2 of coastal tidal flats.
- coastal tidal flat /
- Landsat imagery /
- MSIC /
- OTSU /
- Google Earth Engine (GEE)

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References

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