Technical note: Bathymetry observations of inland water  bodies using a tethered single-beam sonar controlled by  an unmanned aerial vehicle

Bandini, Filippo; Olesen, Daniel; Jakobsen, Jakob; Kittel, Cécile Marie Margaretha; Wang, Sheng; García, Mónica; Bauer‐Gottwein, Peter

doi:10.5194/hess-22-4165-2018

Cited by 61 publications

(36 citation statements)

References 61 publications

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“…Alongside solely airborne techniques, the combination of USVs and UAVs has become more prominent. Although there are examples of UAVs being used to “tether” USVs (Alvarez et al, ; Bandini et al, ), the majority of studies operate the platforms separately. By combining the two techniques, it is possible to collate information on either the topographic and bathymetric or the above and below canopy nature of a river corridor.…”

Section: The State Of the Artmentioning

confidence: 99%

Remote sensing of river corridors: A review of current trends and future directions

Tomsett

Leyland

2019

River Research & Apps

103

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River corridors play a crucial environmental, economic, and societal role yet also represent one of the world's most dangerous natural hazards, making monitoring imperative to improve our understanding and to protect people. Remote sensing offers a rapidly growing suite of methods by which river corridor monitoring can be performed efficiently, at a range of scales and in difficult environmental conditions. This paper aims to evaluate the current state and assess the potential future of river corridor monitoring, whilst highlighting areas that require further investigation. We initially review established methods that are used to undertake river corridor monitoring, framed by the context and scales upon which they are applied. Subsequently, we review cutting edge technologies that are being developed and focussed around unmanned aerial vehicle and multisensor system advances. We also "horizon scan" for future methods that may become increasingly prominent in research and management, citing examples from within and outside of the fluvial domain. Through review of the literature, it has become apparent that the main gap in fluvial remote sensing lies in the trade-off between resolution and scales. However, prioritising process measurements and simultaneous multisensor data collection is likely to offer a bigger advance in understanding than purely from better surveying methods alone. Challenges regarding the legal deployment of more complex systems, as well as effectively disseminating data into the science community, are amongst those that we propose need addressing. However, the plethora of methods currently available means that researchers and monitoring agencies will be able to identify suitable techniques for their needs.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: The State Of the Artmentioning

confidence: 99%

Remote sensing of river corridors: A review of current trends and future directions

Tomsett

Leyland

2019

River Research & Apps

103

View full text Add to dashboard Cite

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“…Raw data points were interpolated into a bathymetry grid using the Topo-to-Raster tool in ArcGIS, retaining sinks in the data. We assumed an uncertainty in the sonar measurements, and hence a lake volume of 4%, following [32] who compared the Deeper Smart Sonar PRO+ to plumb-line measurements and a second reference sonar device (SS510 Smart Sensor). Lake bathymetry is measured to a reference elevation of 794.70 ± 0.06 m, derived from an average of three water-level measurements taken with an Emlid Reach RS acting as a rover (≥5-minute occupation).…”

Section: Lake Bathymetry and Surrounding Topographymentioning

confidence: 99%

Shrinkage of Nepal’s Second Largest Lake (Phewa Tal) Due to Watershed Degradation and Increased Sediment Influx

et al. 2019

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Phewa Lake is an environmental and socio-economic asset to Nepal and the city of Pokhara. However, the lake area has decreased in recent decades due to sediment influx. The rate of this decline and the areal evolution of Phewa Lake due to artificial damming and sedimentation is disputed in the literature due to the lack of a historical time series. In this paper, we present an analysis of the lake’s evolution from 1926 to 2018 and model the 50-year trajectory of shrinkage. The area of Phewa Lake expanded from 2.44 ± 1.02 km2 in 1926 to a maximum of 4.61 ± 0.07 km2 in 1961. However, the lake area change was poorly constrained prior to a 1957–1958 map. The contemporary lake area was 4.02 ± 0.07 km2 in April 2018, and expands seasonally by ~0.18 km2 due to the summer monsoon. We found no evidence to support a lake area of 10 km2 in 1956–1957, despite frequent reporting of this value in the literature. Based on the rate of areal decline and sediment influx, we estimate the lake will lose 80% of its storage capacity in the next 110–347 years, which will affect recreational use, agricultural irrigation, fishing, and a one-megawatt hydroelectric power facility. Mitigation of lake shrinkage will require addressing landslide activity and sediment transport in the watershed, as well as urban expansion along the shores.

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“…in many of the world's largest rivers), may be more challenging unless there are future significant technological advances (e.g. UAVs tethered to miniaturised, boat-mounted, echo-sounders as illustrated by Alvarez et al (2018); Bandini et al (2018)).…”

Section: The Potential Of Using Aerial Imagery To Quantify the Dynamimentioning

confidence: 99%

Quantification of bedform dynamics and bedload sediment flux in sandy braided rivers from airborne and satellite imagery

Strick

Ashworth

Smith

et al. 2019

Earth Surf Processes Landf

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Images from specially‐commissioned aeroplane sorties (manned aerial vehicle, MAV), repeat unmanned aerial vehicle (UAV) surveys, and Planet CubeSat satellites are used to quantify dune and bar dynamics in the sandy braided South Saskatchewan River, Canada. Structure‐from‐Motion (SfM) techniques and application of a depth‐brightness model are used to produce a series of Digital Surface Models (DSMs) at low and near‐bankfull flows. A number of technical and image processing challenges are described that arise from the application of SfM in dry and submerged environments. A model for best practice is presented and analysis suggests a depth‐brightness model approach can represent the different scales of bedforms present in sandy braided rivers with low‐turbidity and shallow (< 2 m deep) water. The aerial imagery is used to quantify the spatial distribution of unit bar and dune migration rate in an 18 km reach and three ~1 km long reaches respectively. Dune and unit bar migration rates are highly variable in response to local variations in planform morphology. Sediment transport rates for dunes and unit bars, obtained by integrating migration rates (from UAV) with the volume of sediment moved (from DSMs using MAV imagery) show near‐equivalence in sediment flux. Hence, reach‐based sediment transport rate estimates can be derived from unit bar data alone. Moreover, it is shown that reasonable estimates of sediment transport rate can be made using just unit bar migration rates as measured from 2D imagery, including from satellite images, so long as informed assumptions are made regarding average bar shape and height. With recent availability of frequent, repeat satellite imagery, and the ease of undertaking repeat MAV and UAV surveys, for the first time, it may be possible to provide global estimates of bedload sediment flux for large or inaccessible low‐turbidity rivers that currently have sparse information on bedload sediment transport rates. © 2018 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd.

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Technical note: Bathymetry observations of inland water bodies using a tethered single-beam sonar controlled by an unmanned aerial vehicle

Cited by 61 publications

References 61 publications

Remote sensing of river corridors: A review of current trends and future directions

Remote sensing of river corridors: A review of current trends and future directions

Shrinkage of Nepal’s Second Largest Lake (Phewa Tal) Due to Watershed Degradation and Increased Sediment Influx

Quantification of bedform dynamics and bedload sediment flux in sandy braided rivers from airborne and satellite imagery

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