Journal of Korean Society for Geospatial Information Science (대한공간정보학회지)

Korea Spatial Information Society (대한공간정보학회)
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The Analysis of Eulsukdo Shoreline Change Using Multi-temporal Aerial Photo And DSAS Program

다시기 항공사진과 DSAS 기법을 이용한 을숙도 해안선 변화 분석

  • Received : 2012.11.05
  • Accepted : 2012.12.26
  • Published : 2013.03.31
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Abstract

Eulsukdo located in the Nakdong Estuary plays important role in ecosystem and coastal wetland. There have been various changes in Eulsukdo up to now. Recently, we expect a great change of the western part of shoreline in Eulsukdo due to the floodgate construction but there is few databases. In this study, shorelines were digitized after we had produced the ortho-images by using aerial photos taken for 30 years(8 times). SCE, NSM and EPR were analysed by DSAS 4.2 program using vector data. In addition, the changes of shoreline were analysed in October 2011 from before Eulsukdo water gate construction to now by adding field surveying with VRS. The amount of years shoreline change is -0.34m/yr in 2009(before water gate construction) and -0.50m/yr in 2011(during the water gate construction), and the change trend shows an accumulation aspect.

낙동강 하구에 위치한 을숙도는 생태환경의 중요한 지역으로서 국제적인 해안습지 지역이기도 하다. 을숙도 지역은 많은 변화를 통하여 지금의 지형 형태를 나타내고 있으며 최근 을숙도 서편에는 대규모 수문 공사로 인한 해안선 변화가 생길 것으로 예상되지만 그에 대한 기초적인 자료 보전은 미비한 실정이다. 본 연구에서는 을숙도에 대한 지난 30년간(8개년도 구분)의 항공사진을 취득하여 정사영상으로 제작한 뒤, 수치도화 과정을 거쳐 해안선을 추출하였다. 추출된 벡터 자료는 DSAS(Digital Shoreline Analysis System) 4.2 프로그램을 통하여 SCE(Shoreline Change Envelope), NSM(Net Shoreline Movement), EPR(End Point Rate) 분석을 실시하였다. 그리고 2011년 10월에 VRS(Virtual Reference Station) 측량을 실시하여 을숙도 서편에 대한 기준선을 확보하고 이를 통하여 을숙도 수문 공사 전부터 지금까지의 변화를 비교 분석하였다. 수문 공사 전(2009)의 경우 연간 해안선 변화량이 약 -0.34m/yr이었으나, 공사 중(2011)에는 약 -0.50m/yr로 점차 퇴적양상을 나타내고 있었다.

Keywords

References

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