Coupling Unmanned Aerial Vehicle (UAV) and hydraulic surveys to study the geometry and spatial distribution of aquatic macrophytes

H J Biggs (Corresponding Author), V I Nikora, C N Gibbins, S Fraser, D R Green, K Papadopoulos, D M Hicks

Research output: Contribution to journalArticle

Abstract

Aquatic macrophytes are a key component of river systems around the world. Surveys of macrophyte surface cover, cross-sectional blockage and plant/patch sizes provide data for river managers to assess in-stream habitat, hydraulic resistance, and the success of stream restorations. Manual surveying techniques are labour intensive, provide low spatial detail and are predominantly applied at the cross-section scale, resulting in a lack of published data on macrophyte size distributions. In this study, 1099 Ranunculus penicillatus patches were surveyed using a UAV-mounted digital camera. Geometric properties such as patch area, length, aspect ratio and orientation were determined from the aerial orthophotos. These data were then coupled with hydraulic measurements. Macrophyte abundance corresponded to specific ranges of velocity, Froude number and stream power, indicating clear patterns of hydraulic habitat use (and preferential modification) by Ranunculus. At the reach scale, flow redirection around dense vegetation clusters was observed, with implications for localised sedimentation and bank erosion. The reported data can improve the design of laboratory experiments to represent Ranunculus characteristics in the field. The aerial surveying techniques can be used to efficiently estimate vegetation abundance, surface area blockage factor and also to visualise flow through patch mosaics, enabling targeted management of aquatic vegetation.
Original languageEnglish
Pages (from-to)45-58
Number of pages14
JournalJournal of Ecohydraulics
Volume3
Issue number1
Early online date17 Oct 2018
DOIs
Publication statusPublished - 2018

Fingerprint

macrophyte
spatial distribution
hydraulics
geometry
surveying
vegetation
orthophoto
bank erosion
Froude number
patch size
habitat use
river system
surface area
cross section
labor
sedimentation
vehicle
habitat
river

Keywords

  • UAV
  • Hydraulic
  • River
  • Survey
  • Macrophytes
  • Aquatic vegetation
  • Drone
  • Aerial imagery
  • Orthophoto
  • Image analysis
  • Stream power
  • Hydraulic control
  • Vegetation management
  • surveys
  • ADCP
  • Piezometer
  • Ecohydraulics

Cite this

Coupling Unmanned Aerial Vehicle (UAV) and hydraulic surveys to study the geometry and spatial distribution of aquatic macrophytes. / Biggs, H J (Corresponding Author); Nikora, V I; Gibbins, C N; Fraser, S; Green, D R ; Papadopoulos, K; Hicks, D M.

In: Journal of Ecohydraulics, Vol. 3, No. 1, 2018, p. 45-58.

Research output: Contribution to journalArticle

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