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Structure-from-motion photogrammetry analysis of historical aerial photography: determining beach volumetric change over decadal scales

journal contribution
posted on 2020-09-15, 00:00 authored by Rafael Cabral Carvalho, D M Kennedy, Yakufu Niyazi, C Leach, T M Konlechner, Daniel IerodiaconouDaniel Ierodiaconou
Historical aerial photographs are an invaluable tool in shoreline mapping and change detection in coastal landscapes. We evaluate the extent to which structure-from-motion (SfM) photogrammetric methods can be applied to quantify volumetric changes along sandy beaches, using archival imagery. We demonstrate the application of SfM-derived digital surface models (DSMs) at East Beach and Lady Bay in southwest Victoria, Australia, using photographic datasets taken in 1969, 1977 and 1986, and compare them to LiDAR-derived DSMs acquired at both sites in 2007. The SfM approaches resulted in two entire and two partial suitable DSMs out of six datasets. Good-quality DSMs were spatially continuous with a good spread of ground control points (GCPs) near the beach at Lady Bay, whereas unsuitable DSMs were mostly restricted by poor distribution and number of GCPs in spatially segmented areas of East Beach, due to limited overlapping of images, possible poor quality of GCPs and also the propagation of errors in the derived point clouds. A volume of approximately 223 000 ± 72 000 m3 was deposited at Lady Bay between 1969 and 2007, despite minimal erosion observed near the breakwater. The partially suitable dataset of East Beach indicated that beach erosion of at least 39 m3 m−1 occurred immediately to the east of the seawall after 1977. We also discuss the drawbacks and strengths of SfM approaches as a benchmark of historical erosion assessments along sandy beaches. © 2020 John Wiley & Sons, Ltd.

History

Journal

Earth surface processes and landforms

Volume

45

Issue

11

Pagination

2540 - 2555

Publisher

Wiley

Location

Chichester, Eng.

ISSN

0197-9337

eISSN

1096-9837

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal