드론 기반 측량을 활용한 강릉 하시동 사빈지형 변화 탐지
Coastal Changes Detected Using Drone-Based Mapping in Hashidong Beach, Gangneung, South Korea
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참고문헌
키워드
초록
Countermeasures to protect coastal areas with artificial structures such as groins and submerged reefs are common along the eastern coastline of South Korea. However, these structures brought unwanted effects on adjacent beaches in many cases such as Gusan Harbor and Wolsongjeong Beach in Uljin. To identify such side effects, it needs a proper method to survey topographic changes in disturbed areas and neighboring beaches. The drone-based survey is one of the new emerging techniques to produce orthoimagery and digital surface model (DSM). In this study, we applied drone-based survey coupled with GPS surveying using a network real-time kinematic system (NRTK) to detect the topographic changes in Hashidong coast, Gangneung, South Korea, from October, 2014 to October, 2015. As a result, the beach volume in the study area was determined to increase by 26,000 m3 during the winter, but it decreased again by 12,000 ㎥ during the summer. The beach changed seasonally, at a rate of approximately 18.5 m3 m-1 yr-1. This rate could be applied for beach nourishment when we consider artificial recovery for eroded areas. However, continuous monitoring is more required to assess the beach status and to build effective countermeasures to conserve the coastal areas well.
Abstract
Countermeasures to protect coastal areas with artificial structures such as groins and submerged reefs are common along the eastern coastline of South Korea. However, these structures brought unwanted effects on adjacent beaches in many cases such as Gusan Harbor and Wolsongjeong Beach in Uljin. To identify such side effects, it needs a proper method to survey topographic changes in disturbed areas and neighboring beaches. The drone-based survey is one of the new emerging techniques to produce orthoimagery and digital surface model (DSM). In this study, we applied drone-based survey coupled with GPS surveying using a network real-time kinematic system (NRTK) to detect the topographic changes in Hashidong coast, Gangneung, South Korea, from October, 2014 to October, 2015. As a result, the beach volume in the study area was determined to increase by 26,000 m3 during the winter, but it decreased again by 12,000 ㎥ during the summer. The beach changed seasonally, at a rate of approximately 18.5 m3 m-1 yr-1. This rate could be applied for beach nourishment when we consider artificial recovery for eroded areas. However, continuous monitoring is more required to assess the beach status and to build effective countermeasures to conserve the coastal areas well.
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