Remote survey of large-scale braided, gravel-bed rivers using digital photogrammetry and image analysis

Westaway, Richard; Lane, Stuart N.; Hicks, D. Murray

doi:10.1080/01431160110113070

Cited by 173 publications

(222 citation statements)

References 19 publications

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“…At the sub-reach scale, geomorphic units, large wood, water depth and bed sediment sizes have been measured from high-resolution RS data (Westaway et al 2003;Legleiter 2012Legleiter , 2014. For example, image texture has been used successfully to estimate bed sediment size as areas with larger sediment have more shadows, which suggest a more heterogeneous texture (Carbonneau et al 2004(Carbonneau et al , 2005Buscombe et al 2010).…”

Section: Woody Debris (Smikrud and Prakash 2006)mentioning

confidence: 99%

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The use of remote sensing to characterise hydromorphological properties of European rivers

et al. 2015

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Remote sensing (RS) technology offers unparalleled opportunities to explore river systems using RADAR, multispectral, hyper spectral, and LiDAR data. The accuracy reached by these technologies recently has started to satisfy the spatial and spectral resolutions required to properly analyse the hydromorphological character of river systems at multiple scales. Using the River Hierarchical Framework (RHF) as a reference we describe the state-of-the-art RS technologies that can be implemented to quantify hydromorphological characteristics at each of the spatial scales incorporated in the RHF (i. e. catchment, landscape unit, river segment, river reach, sub-reach-geomorphic and hydraulic units). We also report the results of a survey on RS data availability in EU member states that shows the current potential to derive RHF hydromorphological indicators from high-resolution multispectral images and topographic LiDAR at the national scale across Europe. This paper shows that many of the assessment indicators proposed by the RHF can be derived by different RS sources and existing methodologies, and that EU countries have sufficient RS data at present to already begin their incorporation into hydromorphological assessment and monitoring, as mandated by WFD. With cooperation and planning, RS data can form a fundamental component of hydromorphological assessment and monitoring in the future to help support the effective and sustainable management of rivers, and this would be done most effectively through the establishment of multi-purpose RS acquisition campaigns and the development of shared and standardized hydromorphological RS databases updated regularly through planned resurveyed campaigns.

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Section: Woody Debris (Smikrud and Prakash 2006)mentioning

confidence: 99%

“…Lateral migration, planform changes, Bed incision/aggradation Lateral migration, channel pattern changes, bed incision/aggradation (Fuller et al 2003;Westaway et al 2003;Notebaert et al 2009;Wheaton et al 2013;Pirot et al 2014;Lallias-Tacon et al 2014) LiDAR and DEM (various resolutions and sources)…”

Section: Channel Dimensions and Featuresmentioning

confidence: 99%

The use of remote sensing to characterise hydromorphological properties of European rivers

et al. 2015

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“…Another advantage compared to both sonar-based and terrestrial mapping lies in the fact that no contact with the water body and the alluvial environment is necessary which is especially beneficial for capturing ecologically sensitive areas (Irish and Lillycrop, 1999) and dangerous river sections (cliffs, currents, etc.). The same argument applies for shallow water capturing techniques based on passive imagery (Marcus and Fonstad, 2008) either by exploiting spectrally based information (Legleiter, 2012) or via two-media-photogrammetry (Westaway et al, 2003), but image * Corresponding author based methods often fail in case of (overhanging) riparian vegetation whereas ALB can potentially penetrate the vegetation through small openings in the leaf structure (Mandlburger et al, 2015a).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a Novel Uav-Borne Topo-Bathymetric Laser Profiler

Mandlburger¹,

Pfennigbauer²,

Wieser³

et al. 2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:We present a novel topo-bathymetric laser profiler. The sensor system (RIEGL BathyCopter) comprises a laser range finder, an Inertial Measurement Unit (IMU), a Global Navigation Satellite System (GNSS) receiver, a control unit, and digital cameras mounted on an octocopter UAV (RiCOPTER). The range finder operates on the time-of-flight measurement principle and utilizes very short laser pulses (<1 ns) in the green domain of the spectrum (λ=532 nm) for measuring distances to both the water surface and the river bottom. For assessing the precision and accuracy of the system an experiment was carried out in October 2015 at a pre-alpine river (Pielach in Lower Austria). A 200 m longitudinal section and 12 river cross sections were measured with the BathyCopter sensor system at a flight altitude of 15-20 m above ground level and a measurement rate of 4 kHz. The 3D laser profiler points were compared with independent, quasi-simultaneous data acquisitions using (i) the RIEGL VUX1-UAV lightweight topographic laser scanning system (bare earth, water surface) and (ii) terrestrial survey (river bed). Over bare earth the laser profiler heights have a std. dev. of 3 cm, the water surface height appears to be underestimated by 5 cm, and river bottom heights differ from the reference measurements by 10 cm with a std. dev. of 13 cm. When restricting the comparison to laser profiler bottom points and reference measurements with a lateral offset below 1 m, the values improve to 4 cm bias with a std. dev. of 6 cm. We report additionally on challenges in comparing UAV-borne to terrestrial profiles. Based on the accuracy and the small footprint (3.5 cm at the water surface) we concluded that the acquired 3D points can potentially serve as input data (river bed geometry, grain roughness) and validation data (water surface, water depth) for hydrodynamic-numerical models.

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“…One of the main challenges for the empirical surveys has been how to achieve sufficient temporal resolution to study rapidly evolving fluvial processes and forms in the required level of detail [16,18]. In addition, the bathymetric surveys suffer from lower spatial resolution and accuracy compared to the topographical surveys [19,20]. This is why, in the wake of new technological developments during the 21st century, an increasing number of studies aiming of deepening the understanding of meander dynamics and challenging the fundamental theories of meandering rivers have been published.…”

Section: Introductionmentioning

confidence: 99%

Flow Patterns and Morphological Changes in a Sandy Meander Bend during a Flood—Spatially and Temporally Intensive ADCP Measurement Approach

Kasvi

Laamanen²,

Lotsari

et al. 2017

Water

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Abstract:The fluvio-geomorphological processes in meander bends are spatially uneven in distribution. Typically, higher velocities and erosion take place near the outer bank beyond the bend apex, while the inner bend point bar grows laterally towards the outer bank, increasing the bend amplitude. These dynamics maintain the meander evolution. Even though this development is found in meandering rivers independent of soil or environmental characteristics, each river still seems to behave unpredictably. The special mechanisms that determine the rate and occasion of morphological changes remain unclear. The aim of this study is to offer new insights regarding flow-induced morphological changes in meander using a novel study approach. We focused on short-term and small-spatial-scale changes by conducting a spatially and temporally (daily) intensive survey during a flood (a period of nine days) with an ADCP attached to a remotely controlled mini-boat. Based on our analysis, the flood duration and the rate of discharge increase and decrease seems to play key roles in determining channel changes by controlling the flow velocities and depth and the backwater effect may have notable influence on the morphological processes. We discuss themes such as the interaction of inner and outer bend processes and the longer-term development of meander bends.

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Remote survey of large-scale braided, gravel-bed rivers using digital photogrammetry and image analysis

Cited by 173 publications

References 19 publications

The use of remote sensing to characterise hydromorphological properties of European rivers

The use of remote sensing to characterise hydromorphological properties of European rivers

Evaluation of a Novel Uav-Borne Topo-Bathymetric Laser Profiler

Flow Patterns and Morphological Changes in a Sandy Meander Bend during a Flood—Spatially and Temporally Intensive ADCP Measurement Approach

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