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Remote Sensing for Natural Resources    2022, Vol. 34 Issue (4) : 68-75     DOI: 10.6046/zrzyyg.2022182
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A study on the changes in coastal tidal flats in the Laizhou Bay based on MSIC and OTSU
LI Yi1,2(), CHENG Lina2,3(), LU Yingying2,4, ZHANG Bochun1,2, YU Sen1,2, JIA Mingming2
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
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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.
Keywords coastal tidal flat      Landsat imagery      MSIC      OTSU      Google Earth Engine (GEE)     
ZTFLH:  TP79  
Issue Date: 27 December 2022
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Yi LI
Lina CHENG
Yingying LU
Bochun ZHANG
Sen YU
Mingming JIA
Cite this article:   
Yi LI,Lina CHENG,Yingying LU, et al. A study on the changes in coastal tidal flats in the Laizhou Bay based on MSIC and OTSU[J]. Remote Sensing for Natural Resources, 2022, 34(4): 68-75.
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https://www.gtzyyg.com/EN/10.6046/zrzyyg.2022182     OR     https://www.gtzyyg.com/EN/Y2022/V34/I4/68
Fig.1  Geographical location of the study area
Fig.2  Interannual distribution and proportion of each image stack
Fig.3  Technical flowchart
类别 海水 养殖池/盐田 滨海植被 农田 内陆植被 滩涂 人工表面 内陆水体 裸地 总计
海水 105 0 0 0 0 7 0 1 0 113
养殖池/盐田 1 224 0 2 0 0 0 4 0 231
滨海植被 0 2 65 0 0 2 0 0 0 69
农田 0 4 0 222 1 0 2 0 1 230
内陆植被 0 0 4 0 17 0 0 0 0 21
滩涂 7 5 6 0 0 220 0 2 0 240
人工表面 0 0 1 9 1 0 110 0 1 122
内陆水体 2 0 0 0 0 2 0 31 0 35
裸地 0 0 0 0 0 0 0 0 7 7
总计 115 235 76 233 19 231 112 38 9 1 068
Tab.1  Confusion matrix of land cover classification results of tidal flats and surrounding land covers in 2020
Fig.4  Land cover of intertidal zone in Laizho Bay from 1990 to 2020
Fig.5  Mutual transformation tidal flats and surrounding features from 1990 to 2020
土地利用类型 2020年
内陆植被 滨海植被 海水 裸地 内陆水体 农田 人工表面 滩涂 养殖池/盐田 总计
1990
年		 内陆植被 49.03 1.51 0.00 0.16 0.69 45.67 20.80 0.00 7.53 125.39
滨海植被 1.66 219.78 6.39 1.81 8.53 73.29 12.56 9.75 227.43 561.20
海水 0.00 0.01 2 716.50 0.00 17.62 0.00 29.12 155.58 54.19 2 973.02
裸地 0.00 0.00 0.00 3.40 0.00 0.11 0.19 0.00 0.92 4.62
内陆水体 0.09 18.42 4.74 0.07 85.93 8.98 1.20 10.17 8.92 138.52
农田 9.78 14.22 0.00 0.65 5.84 1 137.57 87.21 0.23 79.62 1 335.12
人工表面 0.12 0.43 0.82 0.41 0.22 15.53 334.53 0.37 5.98 358.41
滩涂 3.67 100.30 129.08 0.00 46.06 2.58 24.68 645.27 414.20 1 365.84
养殖池/盐田 2.02 2.70 0.91 0.73 2.32 16.61 100.21 1.02 694.39 820.91
总计 66.37 357.37 2 858.44 7.23 167.21 1 300.34 610.50 822.39 1 493.18 7 683.03
Tab.2  Land use transition matrix from 1990 to 2020(km2)
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