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首页> 外文期刊>Estuarine Coastal and Shelf Science >An optimal waterline approach for studying tidal flat morphological changes using remote sensing data: A case of the northern coast of Vietnam
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An optimal waterline approach for studying tidal flat morphological changes using remote sensing data: A case of the northern coast of Vietnam

机译：利用遥感数据研究潮滩形态变化的最佳水线方法：以越南北部海岸为例

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摘要

Tidal flats on the north coast of Vietnam suffer diurnal tide with a tide range varying between 0.3 m and 3.5 m. Along the 350 km long coastline, the diversity of environmental conditions induces various tidal flats with different characteristics. This study applies the waterline method for multi-temporal satellite images to build Digital Elevation Models (DEMs) of tidal flats during the last 25 years. 117 Landsat images acquired with TM, ETMthorn, and OLI have been processed to construct tidal flat DEMs in 1989, 2000, and 2014. Waterlines extracted from single spectral bands (near-infrared [NIR], short wave infrared [SWIR]) or band ratios (normalized difference water index [NDWI], normalized difference vegetation index [NDVI], Green/SWIR) of the Landsat data have been compared with waterlines digitalized on Spot, Aster and Worldview 2 images. This experiment allows us to determine the best band (or band ratio) for extracting waterlines depending on local conditions. Consequently, the study shows that the Green/SWIR ratio image is a good solution for extracting waterlines in the black coal tidal flats of Cam Pha. However, the NDWI index appears to be a better choice for the other parts of the study area. The vertical accuracy of the tidal flat DEMs reaches 0.144 m. The change analysis of the DEMs also emphasizes the tidal flat evolution in both vertical and horizontal dimensions, i.e. erosion or accretion. The erosion of the tidal flats along the northern coast of Vietnam is particularly developed in the area extending from Yen Hung to Mong Cai, especially in Mong Cai with an amount of about 50 x 10(6) m(3) of sediments lost between 1989 and 2014. On the contrary, the tidal flats in the south of the study area show a high rate of deposition due to the sediments fed by Red and Thai Binh rivers. About 35 x 10(6) m(3) of sediments deposited in the tidal flat surrounding the Red River mouth between 1989 and 2014. This study represents a development of the waterline extraction method to investigate the evolution of tidal flat at a large scale and a diversified coastal environment using optical satellite images and fieldwork.
机译：越南北海岸的滩涂日间潮汐，范围在0.3 m至3.5 m之间。沿着350公里长的海岸线，环境条件的多样性诱发了各种具有不同特征的潮滩。这项研究将水线方法用于多时相卫星图像，以建立过去25年间的滩涂数字高程模型（DEM）。分别在1989年，2000年和2014年处理了用TM，ETMthorn和OLI采集的117张Landsat图像，以构建潮汐平面DEM。从单个光谱带（近红外[NIR]，短波红外[SWIR]）或波段中提取了水线已将Landsat数据的比率（归一化差异水指数[NDWI]，归一化差异植被指数[NDVI]，Green / SWIR）与在Spot，Aster和Worldview 2图像上数字化的水线进行了比较。该实验使我们能够根据当地条件确定提取水线的最佳波段（或波段比）。因此，研究表明，Green / SWIR比图像是提取Cam Pha黑煤滩涂水线的良好解决方案。但是，NDWI指数似乎是研究区域其他部分的更好选择。潮汐平面DEM的垂直精度达到0.144 m。 DEM的变化分析还强调了潮汐平面在垂直和水平方向上的演变，即侵蚀或增生。越南北部海岸沿滩的侵蚀尤其发生在从颜红到旺仔的地区，尤其是旺仔，在1989年之间损失了大约50 x 10（6）m（3）的沉积物和2014年。相反，由于红河和泰平河的沉积物，研究区南部的滩涂显示出很高的沉积率。在1989年至2014年之间，大约有35 x 10（6）m（3）的沉积物沉积在红河河口周围的滩涂中。该研究代表了等高线提取方法的研究进展，以调查大规模的滩涂演化。利用光学卫星图像和野外作业在多元化的沿海环境中工作。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2020年第may5期|106613.1-106613.15|共15页
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  • 作者单位

    Univ Sci & Technol Ha Noi USTH VAST Space & Applicat Dept 18 Hoang Quoc Viet Hanoi Vietnam|Univ Reims GEGENAA EA 3795 FR CNRS Condorcet 3417 2 Esplanade Roland Garros F-51100 Reims France;

    Univ Reims GEGENAA EA 3795 FR CNRS Condorcet 3417 2 Esplanade Roland Garros F-51100 Reims France;

    Ha Noi Univ Min & Geol 18 Pho Vien Hanoi Vietnam;

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  • 正文语种 eng
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  • 关键词

    Tidal flats; Landsat; Waterlines extraction; Morphological change; Gulf of tonkin;

    机译：滩涂;陆地卫星等高线提取;形态变化;顿金湾;

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