Applications of Close‐Range Imagery in River Research

Bertoldi, Walter; Piégay, Hervé; Buffin‐Bélanger, Thomas; Graham, David J.; Rice, Stephen P.

doi:10.1002/9781119940791.ch15

Cited by 11 publications

(7 citation statements)

References 71 publications

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“…In co-evolution with UAV and ultralight trikes, SfM photogrammetry has largely resolved the issue of image orthorectification and digital elevation model (DEM) production (James and Robson, 2012;Westoby et al, 2012;Fonstad et al, 2013). Such low-cost platforms are usually equipped with commercial digital cameras, with varied configurations and technical options as technology is rapidly evolving (Marcus and Fonstad, 2010;Bertoldi et al, 2012;Entwistle et al, 2018). More recently, there is a growing availability of drones equipped with real-time kinematic (RTK) GPS allowing for centimetre accuracy positioning of the imagery.…”

Section: Airborne Techniquesmentioning

confidence: 99%

Remotely sensed rivers in the Anthropocene: state of the art and prospects

Piégay

Arnaud

Belletti

et al. 2020

Earth Surf Processes Landf

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103

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The rivers of the world are undergoing accelerated change in the Anthropocene, and need to be managed at much broader spatial and temporal scales than before. Fluvial remote sensing now offers a technical and methodological framework that can be deployed to monitor the processes at work and to assess the trajectories of rivers in the Anthropocene. In this paper, we review research investigating past, present and future fluvial corridor conditions and processes using remote sensing and we consider emerging challenges facing fluvial and riparian research. We introduce a suite of remote sensing methods designed to diagnose river changes at reach to regional scales. We then focus on identification of channel patterns and acting processes from satellite, airborne or ground acquisitions. These techniques range from grain scales to landform scales, and from real time scales to inter-annual scales. We discuss how remote sensing data can now be coupled to catchment scale models that simulate sediment transfer within connected river networks. We also consider future opportunities in terms of datasets and other resources which are likely to impact river management and monitoring at the global scale. We conclude with a summary of challenges and prospects for remotely sensed rivers in the Anthropocene.

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Section: Airborne Techniquesmentioning

confidence: 99%

Remotely sensed rivers in the Anthropocene: state of the art and prospects

Piégay

Arnaud

Belletti

et al. 2020

Earth Surf Processes Landf

Self Cite

160

103

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“…Systematic examination of hydraulics across gradients of these microtopographic variables in flume experiments (Sambrook Smith and Nicholas, ; Canavaro et al ., ; Hardy et al ., ) and using numerical simulations may be valuable. However, notwithstanding numerous recent advances (Hodge et al ., ; Large and Heritage, ; Bertoldi et al ., ) there is also a continued (cf. Lane, ) and parallel need to develop better means of routinely acquiring patch‐scale DEMs or other surface representations, from which suitable roughness parameterizations are extracted.…”

Section: Discussionmentioning

confidence: 99%

Sensitivity of interfacial hydraulics to the microtopographic roughness of water‐lain gravels

Rice

Buffin‐Bélanger

Reid

2013

Earth Surf Processes Landf

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Flow within the interfacial layer of gravel-bed rivers is poorly understood, but this zone is important because the hydraulics here transport sediment, generate flow structures and interact with benthic organisms. We hypothesized that different gravel-bed microtopographies generate measurable differences in hydraulic characteristics within the interfacial layer. This was tested using a high density of spatially and vertically distributed, velocity time series measured in the interfacial layers above three surfaces of contrasting microtopography. These surfaces had natural water-worked textures, captured in the field using a casting procedure. Analysis was repeated for three discharges, with Reynolds numbers between 165000 and 287000, to evaluate whether discharge affected the impact of microtopography on interfacial flows. Relative submergence varied over a small range (3.5 to 8.1) characteristic of upland gravel-bed rivers. Between-surface differences in the median and variance of several time-averaged and turbulent flow parameters were tested using non-parametric statistics. Across all discharges, microtopographic differences did not affect spatially averaged (median) values of streamwise velocity, but were associated with significant differences in its spatial variance, and did affect spatially averaged (median) turbulent kinetic energy. Sweep and ejection events dominated the interfacial region above all surfaces at all flows, but there was a microtopographic effect, with Q2 and Q4 events less dominant and structures less persistent above the surface with the widest relief distribution, especially at the highest Reynolds number flow. Results are broadly consistent with earlier work, although this analysis is unique because of the focus on interfacial hydraulics, spatially averaged 'patch scale' metrics and a statistical approach to data analysis. An important implication is that observable differences in microtopography do not necessarily produce differences in interfacial hydraulics. An important observation is that appropriate roughness parameterizations for gravel-bed rivers remain elusive, partly because the relative contributions to flow resistance of different aspects of bed microtopography are poorly constrained.

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“…To better understand these interactions, it is important to consider a multidisciplinary approach, capable of providing managers with insights of the beneficial and detrimental feedbacks that LiDAR that can be collected by ground-, airborne-and satellite-based instruments) of anabranching river systems is emerging as a key solution as it is capable of describing a wide range of temporal and spatial scales (Marcus & Fonstad, 2010). The recent increasing spatial and temporal resolution of remote sensing technologies is constantly improving our capacity to monitor rivers and their proximal landforms (Bertoldi et al, 2012).…”

Section: Future Directionsmentioning

confidence: 99%

Riparian vegetation and geomorphological interactions in anabranching rivers: A global review

et al. 2021

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Anabranching rivers are characterized by multiple active channels. Vegetation, flow regime and sediment retention are critical components for the formation, evolution and stability of these rivers; however, the connections relating river dynamics with riparian vegetation development and distribution are still not well known. This review discusses the relationship between anabranching rivers and riparian vegetation, showing examples of how vegetation affects anabranching rivers and how it is also affected by river dynamics. Consequences of poor management and human activities that can disrupt river–vegetation systems are also explored, presenting some examples of modifications to the stability and longevity of anabranching rivers. Challenges to design and implement appropriate policy and management practices in anabranching rivers are most frequently driven by poor experimental evidence due to difficulties in collecting data in these often remote and large river systems. Remote sensing technologies that account for key interactions between riparian vegetation, river flow and morphology changes can provide means to overcome these challenges.

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Applications of Close‐Range Imagery in River Research

Cited by 11 publications

References 71 publications

Remotely sensed rivers in the Anthropocene: state of the art and prospects

Remotely sensed rivers in the Anthropocene: state of the art and prospects

Sensitivity of interfacial hydraulics to the microtopographic roughness of water‐lain gravels

Riparian vegetation and geomorphological interactions in anabranching rivers: A global review

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