Vegetation Stress Analyses using Sentinel 2A Image and Field Measurement at Geothermal Surface Manifestation
Keywords:
Vegetation Stress, Geological, Kamojang, SENTINELAbstract
The high-temperature geothermal areas in Java Island are located mainly within the volcanic zone extending from west to east. The demand for electrification of the areas increases, as well as the green energy utilization in Indonesia. Kamojang Geothermal Field (KGF) was selected as a study site due to the oldest geothermal field in Indonesia with high steam temperature. The analyses of vegetation indices based on remote sensing techniques at high-temperature geothermal areas have been reported by previous studies. However, comprehensive analyses with ground measurement is still limited. In this study, the normalized difference vegetation index (NDVI) was selected as an apriori indicator for vegetation stress related to the hydrothermal fluid contamination in the soil. Verifying the NDVI calculation using Sentinel 2A image, we measured the plant's physiological condition, such as chlorophyll content in their leaves, leaf dimension, and branches' length. We also measured the soil temperature at depth ±15 cm and mapped the homogeneous vegetation types (ferns). According to this study, we present the vegetation stress signature at the surface manifestation of KGF. The physiological condition of fern species, chlorophyll content, and soil temperature showed a clear negative response to the presence of geothermal surface manifestation.
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References
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