Displacement Analysis of Geothermal Field Based on PSInSAR and SOM Clustering Algorithms: A Case Study of Brady Field, Nevada—USA
| Autor: | Hilal Soydan, Ge Jin, Jaime Moraga, Sebnem Duzgun, Mahmut Cavur |
|---|---|
| Přispěvatelé: | Çavur, Mahmut |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
010504 meteorology & atmospheric sciences
Field (physics) Science 0211 other engineering and technologies Subsidence 02 engineering and technology Geodesy 01 natural sciences Displacement (vector) law.invention displacement on Brady geothermal Interferometry time-series analysis for displacement law SOM for displacement analysis General Earth and Planetary Sciences PSI Vertical displacement Radar Cluster analysis Geothermal gradient Geology 021101 geological & geomatics engineering 0105 earth and related environmental sciences |
| Zdroj: | Remote Sensing, Vol 13, Iss 349, p 349 (2021) Remote Sensing Volume 13 Issue 3 Pages: 349 |
| ISSN: | 2072-4292 |
| Popis: | The availability of free and high temporal resolution satellite data and advanced SAR techniques allows us to analyze ground displacement cost-effectively. Our aim was to properly define subsidence and uplift areas to delineate a geothermal field and perform time-series analysis to identify temporal trends. A Persistent Scatterer Interferometry (PSI) algorithm was used to estimate vertical displacement in the Brady geothermal field located in Nevada by analyzing 70 Sentinel-1A Synthetic-Aperture Radar (SAR) images, between January 2017 and December 2019. To classify zones affected by displacement, an unsupervised Self-Organizing Map (SOM) algorithm was applied to classify points based on their behavior in time, and those clusters were used to determine subsidence, uplift, and stable regions automatically. Finally, time-series analysis was applied to the clustered data to understand the inflection dates. The maximum subsidence is –19 mm/yr with an average value of –6 mm/yr within the geothermal field. The maximum uplift is 14 mm/yr with an average value of 4 mm/yr within the geothermal field. The uplift occurred on the NE of the field, where the injection wells are located. On the other hand, subsidence is concentrated on the SW of the field where the production wells are located. The coupling of the PSInSAR and the SOM algorithms was shown to be effective in analyzing the direction and pattern of the displacements observed in the field. |
| Databáze: | OpenAIRE |
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