期刊
IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
卷 15, 期 -, 页码 2696-2708出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTARS.2022.3162622
关键词
Sediments; Optical wavelength conversion; Reflectivity; Rivers; Tides; Sea measurements; Minerals; Hyperspectral imaging; land surface; remote sensing; sediments; soil properties
类别
资金
- Japan Society for the Promotion of Science KAKENHI [18H01924]
- Grants-in-Aid for Scientific Research [18H01924] Funding Source: KAKEN
This article aimed to develop appropriate models using Sentinel 2A images to estimate the water content and grain size of surface sediments on the Red river delta. The study found correlations between spectral reflectance and water content/grain size, and accuracy of the models was verified. Maps of water content and sediment type distributions were produced using the models.
Sediment properties such as water content (WC) and grain size (GS) are essential to characterize the environmental conditions of tidal flats. This article aimed to develop appropriate models to estimate the WC and GS of surface sediments for an intertidal flat on the Red river delta (Vietnam) using Sentinel 2A (S2A) images. The spectral reflectance, WC, and GS of 96 sub-samples from 12 sediment samples collected on December 17, 2017 were measured to clarify their relationships. The WC was highly correlated with the reflectance ratio of two shortwave-infrared bands, R(2190)/R(1610) (R-2 = 0.93). The median GS (D-50) at 0%, 15%, and 20% of WC was significantly correlated with the reflectance ratio of the near-infrared band (842 nm) versus the visible-green band (560 nm) (R-2 > 0.78). Next, D-50 was estimated from a multivariate regression model using this band ratio, the visible-red band (665 nm), and WC. The accuracy of the models was verified by comparisons with WC and D-50 from 20 samples collected on March 12(th) 2019 (RMSE of both WC and D-50 < 15%). Then, the WC and sediment type distributions were mapped by applying these models to two S2A scenes. The maps showed high WC (>30%) in very fine sediments (silts), which is consistent with other intertidal flats with similar sediment types. This article was limited to fine sediment samples. Therefore, our next step is to incorporate coarse sediments into the models to provide more universal mapping of WC and sediment types.
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