Application of data fusion methods of index overlay, Dempster Shafer and fuzzy AHP in geothermal resources potential mapping and their prioritization in Zanjan Province

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RIAHI SHOKOUH; MORADZADEH ALI; PAHLAVANI PARHAM; Keshtdar Ali

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Journal: JOURNAL OF RESEARCH ON APPLIED GEOPHYSICS Year:2020 | Volume:6 | Issue:1 Page(s): 61-74

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Title

Application of data fusion methods of index overlay, Dempster Shafer and fuzzy AHP in geothermal resources potential mapping and their prioritization in Zanjan Province

Author(s)

RIAHI SHOKOUH | MORADZADEH ALI | PAHLAVANI PARHAM | Keshtdar Ali | Issue Writer Certificate

Keywords

Geothermal resources potential

Zanjan Province

Geophysical information Layers

Data fusion

Exploration information layers

Overlay

Index overlay

Dempster Shafer (DS)

Fuzzy AHP

Abstract

Summary Geothermal energy is a clean, renewable and economic energy resource, therefore its exploration is very important. In Iran there are many hot springs and there are so much evidences in many areas that show geothermal resources. So far, many exploration operations have been carried out to discover this resources. Considering the evidences of geothermal resources in Zanjan Province, it is tried in this study to recognize and prioritize the areas having geothermal resource potential using several information layers such as geophysical layers obtained from airborne magnetic data; Curie depth, thermal gradient and thermal flow maps, which have been weighted using Fuzzy AHP method. Then, these layers were fused by index Overlay method and the regions with geothermal potential were obtained. These regions were then prioritized and defined as the best regions that have geothermal potential by using Fuzzy AHP/Dempster-Shafer (DS) method. As a result, regions 11, 16 and 13, with scores values of 0. 702, 0. 621 and 0. 592 were recognized as the best regions for having geothermal potential. Final results have shown that Overlay and fusion data by means of DS method is acceptable and reliable, once the weights of the layers are obtained using Fuzzy AHP scheme. Using existing evidences such as hot springs and other information related to the geothermal resources, we validated the obtained results and concluded that the results were sufficiently accurate. Introduction In spite of the occurrence many evidences that indicate several rich regions of the geothermal resource in Iran, very few exploration studies have been carried out so far specially in Zanjan Province that have a lot of hot springs and other relevant evidences. Geothermal heat flux is one of the main parameters to be investigated in geothermal exploration programs but few direct heat flux measurements are available in Iran. We can get reliable and better result by using all exploration criteria related to the geothermal resources such as lithological, remote sensing, structural and Geophysical information Layers, if we use a suitable method to Overlaying and fusion these layers. In this study we firstly use index Overlay and fuzzy methods for Overlaying these data and the DS-Fuzzy AHP technique is then used for Data fusion and prioritizing of the results. Methodology and Approaches In the first step, relevant digital information layers were prepared. They comprised of lithology layer, alteration layer obtained from ASTER data, structural layer acquired from lithology, ASTER and airborne magnetic data. Then, Curie depth, thermal gradient and thermal flow maps were obtained using a set of high resolution airborne magnetic data. All of these layers were then integrated by fuzzy logic and index Overlay methods to determine the promise regions of geothermal resources. Finally, the favorable geothermal areas, obtained in the previous stage, were prioritized using DS-FAHP fusion method. Results and Conclusions By examining and evaluating the results and considering the existing evidences such as hot water springs, it is found that the Data fusion DS-Fuzzy AHP methods can provide an acceptable and reliable results. Moreover, the prioritization of the results using these Data fusion methods indicates that high potential geothermal regions are related to all the evidences of geothermal resources. The obtained results also show that by applying Fuzzy AHP for weighting exploration layers, one can consider uncertainty in decision making, and then, by using DS method for Data fusion more reliable results can be acquired.

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APA: Copy

RIAHI, SHOKOUH, MORADZADEH, ALI, PAHLAVANI, PARHAM, & Keshtdar, Ali. (2020). Application of data fusion methods of index overlay, Dempster Shafer and fuzzy AHP in geothermal resources potential mapping and their prioritization in Zanjan Province. JOURNAL OF RESEARCH ON APPLIED GEOPHYSICS, 6(1 ), 61-74. SID. https://sid.ir/paper/268584/en

Vancouver: Copy

RIAHI SHOKOUH, MORADZADEH ALI, PAHLAVANI PARHAM, Keshtdar Ali. Application of data fusion methods of index overlay, Dempster Shafer and fuzzy AHP in geothermal resources potential mapping and their prioritization in Zanjan Province. JOURNAL OF RESEARCH ON APPLIED GEOPHYSICS[Internet]. 2020;6(1 ):61-74. Available from: https://sid.ir/paper/268584/en

IEEE: Copy

SHOKOUH RIAHI, ALI MORADZADEH, PARHAM PAHLAVANI, and Ali Keshtdar, “Application of data fusion methods of index overlay, Dempster Shafer and fuzzy AHP in geothermal resources potential mapping and their prioritization in Zanjan Province,” JOURNAL OF RESEARCH ON APPLIED GEOPHYSICS, vol. 6, no. 1 , pp. 61–74, 2020, [Online]. Available: https://sid.ir/paper/268584/en

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