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http://dx.doi.org/10.3741/JKWRA.2020.53.10.845

A standardized procedure on building spectral library for hazardous chemicals mixed in river flow using hyperspectral image  

Gwon, Yeonghwa (Department of Civil & Environmental Engineering, Dankook University)
Kim, Dongsu (Department of Civil & Environmental Engineering, Dankook University)
You, Hojun (IIHR-Hydroscience & Engineering, University of Iowa)
Publication Information
Journal of Korea Water Resources Association / v.53, no.10, 2020 , pp. 845-859 More about this Journal
Abstract
Climate change and recent heat waves have drawn public attention toward other environmental issues, such as water pollution in the form of algal blooms, chemical leaks, and oil spills. Water pollution by the leakage of chemicals may severely affect human health as well as contaminate the air, water, and soil and cause discoloration or death of crops that come in contact with these chemicals. Chemicals that may spill into water streams are often colorless and water-soluble, which makes it difficult to determine whether the water is polluted using the naked eye. When a chemical spill occurs, it is usually detected through a simple contact detection device by installing sensors at locations where leakage is likely to occur. The drawback with the approach using contact detection sensors is that it relies heavily on the skill of field workers. Moreover, these sensors are installed at a limited number of locations, so spill detection is not possible in areas where they are not installed. Recently hyperspectral images have been used to identify land cover and vegetation and to determine water quality by analyzing the inherent spectral characteristics of these materials. While hyperspectral sensors can potentially be used to detect chemical substances, there is currently a lack of research on the detection of chemicals in water streams using hyperspectral sensors. Therefore, this study utilized remote sensing techniques and the latest sensor technology to overcome the limitations of contact detection technology in detecting the leakage of hazardous chemical into aquatic systems. In this study, we aimed to determine whether 18 types of hazardous chemicals could be individually classified using hyperspectral image. To this end, we obtained hyperspectral images of each chemical to establish a spectral library. We expect that future studies will expand the spectral library database for hazardous chemicals and that verification of its application in water streams will be conducted so that it can be applied to real-time monitoring to facilitate rapid detection and response when a chemical spill has occurred.
Keywords
Hyperspectral; Fluvial remote sensing; Spectral library; Hazardous chemicals; Chemical accident;
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