| 講演要旨(和文) | | 近年，小型無人航空機（UAV）を用いた物理探査手法への関心が急速に高まっている．従来，広域や立ち入り困難地域での効果的な探査のためには，ヘリコプターや固定翼機を用いた重磁力・電磁探査が用いられてきた．しかし，機体改造手続きや，特に人口密集地区では飛行高度の制御などの問題から適用に制限があった．一方で，既存の地表探査手法も地表条件によって探査効率が低下するなどの問題に直面してきた．そのため，既存の空中探査と地表探査の間を埋める手法としてUAVを用いた探査手法への期待が高まっている．それに加え，頻発する土砂災害や火山災害を鑑みれば，立ち入り困難箇所での迅速・安全・正確な調査技術の確立は急務である．そこで本研究では，既存の周波数領域電磁探査法装置をUAVに吊下げる新しいシステムについて，野外実験結果を含む開発概要を紹介する． |
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| | 講演要旨(英文) | | In recent years, interest in the development of geophysical methods using unmanned aerial vehicles (UAVs, i.e., drones) has been growing rapidly. Conventional gravity/magnetic and electromagnetic (EM) exploration by helicopter and fixed-wing aircraft has been used traditionally for efficient exploration of extensive and inaccessible areas. However, the applicable targets have become limited owing to the operational difficulties of meeting the regulations, such as airframe remodeling and flight altitude control, especially in densely inhabited districts (DID). On the other hand, the traditional ground surveying method has been beset with various problems, such as a decline in the exploration efficiency for surface conditions (topography, vegetation, accessibility, and the like), high surveying costs, and others. Accordingly, there is high expectation that the new exploration method, namely, geophysical exploration using UAVs could fill the gap between the conventional airborne and ground surveying methods. Furthermore, in view of natural disasters, such as the Ontake volcanic disaster in 2014 and the Kumamoto earthquake in 2016, there is an urgent need to establish underground surveying methods that are quick, safe, and accurate in inaccessible areas. Therefore, we have been developing a new system that uses the existing portable frequency domain EM electromagnetic system with UAV/drone suspended flight. In this presentation, we introduce the progress and details of the development of this drone suspended EM surveying system, including the results of our field experiments. |
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