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A Subsoil Inspection in a Mangrove Habitat Using Electrical Resistivity Tomography
Shang-Hung Pao 1, Yen-Kung Hsieh 2, Helsin Wang 3, Yao-Chu Tsai 3, Li Lo 4, Chun-Sheng Lee 5, Chia-Jung Chen 5, Chih-Hsin Hu 3 and Hsing-Juh Lin 1
1 Department of Life Science, National Chung Hsing University, Taichung, Taiwan
2 Climate Change Research Center, National Environmental Research Academy, Taoyuan, Taiwan
3 HCK Geophysical, Taipei, Taiwan
4 Department of Geology Science, National Taiwan University, Taipei, Taiwan
5 EverWin Engineering Consultants Co., Ltd., Taichung, Taiwan
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Abstract:
Blue carbon refers to organic carbon sequestered in marine ecosystems, which can make a significant contribution to the removal of carbon dioxide from the atmosphere. Coastal blue carbon ecosystems are important transition areas connecting land, ocean, and even freshwater, including mangroves, salt marshes, and seagrass beds. Among the three major coastal blue carbon ecosystems, mangroves are the most widely distributed in Taiwan. The electrical resistivity tomography (ERT) method has been used for a wide range of near-surface geological, engineering, and environmental purposes. In this study, the ERT method was used for the first time to assist in depth inspection tasks for organic carbon storage in the mangroves located in the Wazihwei Nature Reserve of northern Taiwan. Several ERT survey lines, each around 800 meters in length, were aligned at two sites of the mangroves. The proposed survey depth was set up to approximately 20-30 meters deep. A single borehole sampling was carried out at the northern boundary of the mangrove reserve to confirm the corresponding stratigraphic profile and core sampling analysis. The results of the ERT images showed that the organic carbon of the mangroves in the subsoil can extend up to 3 to 5 meters deep. The volume of organic carbon storage in the mangroves can reach 0.9×106-1.5×106 m3 according to a mangrove area of 30 hectares.
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Keywords: Electrical resistivity tomography, mangroves, subsoil, organic carbon storage.
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*Corresponding author; e-mail: hjlin@dragon.nchu.edu.tw
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©
2024
Marine Research , ISSN 2709-6629
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