Discharge Estimation with the Use of Unmanned Aerial Vehicles (UAVs) and Hydraulic Methods in Shallow Rivers

Although river discharge is essential hydrologic information, it is often absent, especially for small rivers and remote catchment areas. Practical difficulties frequently impede the installation and operation of gauging stations, while satellite-sensed data have proved to be relatively useful only...

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Bibliographic Details
Published in:Water (Basel) 2021-10, Vol.13 (20), p.2808
Main Authors: Lagogiannis, Sergios, Dimitriou, Elias
Format: Article
Language:English
Subjects:
Altitude
Catchment areas
Creeks & streams
Discharge measurement
Empirical equations
Environmental monitoring
Flow velocity
Gaging stations
Hydraulic radius
Hydraulics
Hydrology
Photogrammetry
Remote sensing
River beds
River discharge
River flow
Rivers
Satellites
Sensors
Software
Stream discharge
Stream flow
Unmanned aerial vehicles
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Summary:Although river discharge is essential hydrologic information, it is often absent, especially for small rivers and remote catchment areas. Practical difficulties frequently impede the installation and operation of gauging stations, while satellite-sensed data have proved to be relatively useful only for discharge estimation of large-scale rivers. In this study, we propose a new methodology based on UAV-sensed data and photogrammetry techniques combined with empirical hydraulic equations for discharge estimation. In addition, two different riverbed particle size distributions were incorporated, to study the effect of fine sediment inclusion (or exclusion) in the estimation process. Accordingly, 17 study sites were selected and six different approaches were applied in each. Results show that at 75% of sites at least one approach produced an accurate discharge estimation, while in 10 out the 17 sites (58.8%) all six approaches produced accurate estimations. A strong correlation between a threshold value for the hydraulic radius (Rh = 0.3 m) of cross-sections and high estimation errors for sites exceeding it was also observed. The fine sediment inclusion improved only the performance of certain approaches and did not have a consistently positive effect. Overall, the relatively high percentage of sites with satisfactory discharge estimates indicates that using UAV-derived data and simple hydraulic equations can be used for this purpose, with an acceptable level of accuracy.
ISSN:2073-4441
2073-4441
DOI:10.3390/w13202808