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http://dx.doi.org/10.3741/JKWRA.2021.54.2.121

Development of suspended solid concentration measurement technique based on multi-spectral satellite imagery in Nakdong River using machine learning model  

Kwon, Siyoon (Department of Civil and Environmental Engineering, Seoul National University)
Seo, Il Won (Department of Civil and Environmental Engineering, Seoul National University)
Beak, Donghae (Department of Civil and Environmental Engineering, Seoul National University)
Publication Information
Journal of Korea Water Resources Association / v.54, no.2, 2021 , pp. 121-133 More about this Journal
Abstract
Suspended Solids (SS) generated in rivers are mainly introduced from non-point pollutants or appear naturally in the water body, and are an important water quality factor that may cause long-term water pollution by being deposited. However, the conventional method of measuring the concentration of suspended solids is labor-intensive, and it is difficult to obtain a vast amount of data via point measurement. Therefore, in this study, a model for measuring the concentration of suspended solids based on remote sensing in the Nakdong River was developed using Sentinel-2 data that provides high-resolution multi-spectral satellite images. The proposed model considers the spectral bands and band ratios of various wavelength bands using a machine learning model, Support Vector Regression (SVR), to overcome the limitation of the existing remote sensing-based regression equations. The optimal combination of variables was derived using the Recursive Feature Elimination (RFE) and weight coefficients for each variable of SVR. The results show that the 705nm band belonging to the red-edge wavelength band was estimated as the most important spectral band, and the proposed SVR model produced the most accurate measurement compared with the previous regression equations. By using the RFE, the SVR model developed in this study reduces the variable dependence compared to the existing regression equations based on the single spectral band or band ratio and provides more accurate prediction of spatial distribution of suspended solids concentration.
Keywords
River suspended solid; Remote sensing; Multi-spectral satellite imagery; Support vector machine (SVR); Recursive feature elimination (RFE); Spatial monitoring;
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