Submarine groundwater discharge revealed by aerial thermal infrared imagery: a case study on Jeju Island, Korea

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• 作者：Eunhee Lee ; Ki-mook Kang ; Sung Pil Hyun ; Kil-Yong Lee ; Heesung Yoon ; Seung Hee Kim ; Yongcheol Kim ; Zhen Xu ; Duk-jin Kim ; Dong-Chan Koh and Kyoochul Ha
• 刊名：Hydrological Processes
• 出版年：2016
• 出版时间：15 September 2016
• 年：2016
• 卷：30
• 期：19
• 页码：3494-3506
• 全文大小：1105K
• ISSN：1099-1085

文摘

Submarine groundwater discharge (SGD) is a global phenomenon that carries large volumes of groundwater and dissolved chemical species such as nutrient, metals, and organic compounds to coastal zones. We report the influence of SGD on the coastal waters of Jeju Island, Korea, using high-resolution aerial thermal infrared (TIR) mapping techniques and field investigations. An aircraft-based system was implemented using a cost-effective TIR camera for aerial TIR mapping. Ground-based calibrations and system integration with GPS/IMU (global positioning system/inertial measurement unit) were performed for the aerial systems. The aerial surveys showed distinct low-temperature signatures of SGD along the coasts of Jeju Island, revealing large groundwater inputs from the coastal aquifers to the ocean. Multiple aerial surveys over a range of seasons and tidal stages revealed that SGD rates dynamically affect the sea surface temperature (SST) of the coastal zone. The in-situ measurements supported that SGD has a substantial influence on the coastal water chemistry as well as SST. Our observations highlight the extent to which aerial-based TIR mapping can serve as a powerful tool for studying SGD and other coastal processes. Copyright