Towards a protocol for laser scanning in fluvial geomorphology

Hetherington, David

doi:10.1002/esp.1375

Cited by 231 publications

(179 citation statements)

References 17 publications

(14 reference statements)

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“…The technique was successfully used to assess the adequacy of erosion protection measures (slump blocks) [66]. The usefulness of TLS for the analysis of morphological changes in varied scales has been reported by Heritage and Hetherington [26] as well as Kociuba et al [24]. Moreover, appropriately filtered TLS data sets can provide remarkable information on bank morphology and on the spatial structure of bank retreat processes [67].…”

Section: State Of the Art For Monitoring Bank Erosionmentioning

confidence: 98%

“…An interesting work presented by Heritage and Hetherington [26] defines a protocol to ensure optimal surveying with TLS of river banks: a series of prescriptions are given about tool positioning and surveying design in order to maximize the point cloud quality and accuracy.…”

Section: State Of the Art For Monitoring Bank Erosionmentioning

confidence: 99%

“…Riverbanks in mountain areas are subject to high-energy flows as well as rapidly varying meteorological conditions, which makes them particularly susceptible to different instabilities and erosive activity with possible implications even in terms of flash floods involving large quantities of eroded material and resulting in enormous morphological changes [20,21]. The use of terrestrial laser scanning (TLS) [22,23] has become a well-established practice for detecting riverbank relief changes at different scales [24][25][26][27]. TLS may provide in a straightforward manner a detailed 3-D point cloud describing the topographic surface of the investigated area.…”

Section: Introductionmentioning

confidence: 99%

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Monitoring Riverbank Erosion in Mountain Catchments Using Terrestrial Laser Scanning

et al. 2016

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Sediment yield is a key factor in river basins management due to the various and adverse consequences that erosion and sediment transport in rivers may have on the environment. Although various contributions can be found in the literature about sediment yield modeling and bank erosion monitoring, the link between weather conditions, river flow rate and bank erosion remains scarcely known. Thus, a basin scale assessment of sediment yield due to riverbank erosion is an objective hard to be reached. In order to enhance the current knowledge in this field, a monitoring method based on high resolution 3D model reconstruction of riverbanks, surveyed by multi-temporal terrestrial laser scanning, was applied to four banks in Val Tartano, Northern Italy. Six data acquisitions over one year were taken, with the aim to better understand the erosion processes and their triggering factors by means of more frequent observations compared to usual annual campaigns. The objective of the research is to address three key questions concerning bank erosion: "how" erosion happens, "when" during the year and "how much" sediment is eroded. The method proved to be effective and able to measure both eroded and deposited volume in the surveyed area. Finally an attempt to extrapolate basin scale volume for bank erosion is presented.

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Section: State Of the Art For Monitoring Bank Erosionmentioning

confidence: 98%

Section: State Of the Art For Monitoring Bank Erosionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Monitoring Riverbank Erosion in Mountain Catchments Using Terrestrial Laser Scanning

et al. 2016

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“…Over the last decade, terrestrial laser scanners proved capable of generating very high quality DEM data (e.g. Heritage and Hetherington, 2007;Alho et al, 2009;Hodge et al, 2009a,b;Schaefer and Inkpen, 2010) and have almost become routine in some DEM collection strategies. However, they remain relatively expensive items of technology and have only recently become truly portable.…”

Section: Introductionmentioning

confidence: 99%

Investigating the geomorphological potential of freely available and accessible structure‐from‐motion photogrammetry using a smartphone

Micheletti

Chandler

Lane

2014

Earth Surf Processes Landf

271

225

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We test the acquisition of high‐resolution topographic and terrain data using hand‐held smartphone technology, where the acquired images can be processed using technology freely available to the research community. This is achieved by evaluating the quality of digital terrain models (DTM) of a river bank and an Alpine alluvial fan generated with a fully automated, free‐to‐use, structure‐from‐motion package and a smartphone integrated camera (5 megapixels) with terrestrial laser scanning (TLS) data used to provide a benchmark. To evaluate this approach a 16.2‐megapixel digital camera and an established, commercial, close‐range and semi‐automated software are also employed, and the product of the four combinations of the two types of cameras and software are compared. Results for the river bank survey demonstrate that centimetre‐precision DTMs can be achieved at close range (10 m or less), using a smartphone camera and a fully automated package. Results improve to sub‐centimetre precision with either higher‐resolution images or by applying specific post‐processing techniques to the smartphone DTMs. Application to an entire Alpine alluvial fan system shows the degradation of precision scales linearly with image scale, but that (i) the expected level of precision remains and (ii) difficulties in separating vegetation and sediment cover within the results are similar to those typically found when using other photo‐based techniques and laser scanning systems. Copyright © 2014 John Wiley & Sons, Ltd.

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“…Points were queried at regular intervals along each watercourse where floodplain was present in order to identify a representative elevation of the channel bed. This ignored erroneous data points created as a result of issues with LIDAR returns across the water surface and likely represents an over estimation of the average bed level due to lack of penetration of the LIDAR pulse through deep water [12,13]. The location of formal flood defence embankments were identified using freely available flood defence GIS layers from the Environment Agency (© Environment Agency copyright and/or database right 2016).…”

Section: Methodsmentioning

confidence: 99%

Floodplains: the forgotten and abused component of the fluvial system

Entwistle

Bentley²

2016

E3S Web Conf.

Self Cite

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Abstract. River restoration is strongly focussed on in-channel initiatives driven by fisheries interests and a continued desire for river stability. This contrasts greatly with the inherently mobile nature of watercourses. What is often overlooked is the fact that many rivers have developed floodplain units that would naturally operate as integrated functional systems, moderating the effects of extreme floods by distributing flow energy and sediment transport capacity through out of bank flooding. Floodplain utilisation for farming activities and landowner intransigence when it comes to acknowledging that the floodplain is part of the river system, has resulted in floodplains being the most degraded fluvial morphologic unit, both in terms of loss of form and function and sheer levels of spatial impact. The degradation has been facilitated by the failure of regulatory mechanisms to adequately acknowledge floodplain form and function. This is testament to the 'inward looking' thinking behind national assessment strategies. This paper reviews the state of floodplain systems drawing on quantitative data from England and Wales to argue for greater consideration of the floodplain in relation to river management. The database is poor and must be improved, however it does reveal significant loss of watercourse-floodplain connectivity linked to direct flood alleviation measures and also to altered flood frequency as a result of river downcutting following river engineering. These latter effects have persisted along many watercourses despite the historic nature of the engineering interventions and will continue to exacerbate the risk of flooding to downstream communities. We also present several examples of the local and wider values of reinstating floodplain form and function, demonstrating major ecological gains, improvement to downstream flood reduction, elevation of water quality status and reductions in overall fine sediment loss from farmland. A re-think is required regarding our approach to managing floodplains and funding floodplain restoration, arguing for greater recognition of the natural role of the floodplain as a resource for upstream flood management and as an agent for overall biotic improvement in line with restoration objectives.

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Towards a protocol for laser scanning in fluvial geomorphology

Cited by 231 publications

References 17 publications

Monitoring Riverbank Erosion in Mountain Catchments Using Terrestrial Laser Scanning

Monitoring Riverbank Erosion in Mountain Catchments Using Terrestrial Laser Scanning

Investigating the geomorphological potential of freely available and accessible structure‐from‐motion photogrammetry using a smartphone

Floodplains: the forgotten and abused component of the fluvial system

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