Application of photogrammetry to generate quantitative geobody data in ephemeral fluvial systems

Priddy, Charlotte; Pringle, Jamie K.; Clarke, Stuart M.; Pettigrew, Ross P.

doi:10.1111/phor.12299

Cited by 17 publications

(13 citation statements)

References 32 publications

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“…Preservation of the full element is rare (approximately 15% of examples) with most examples truncated and eroded by basal fifth-order surfaces from either other elements of this type or from sheet-like elements. However, where fully preserved, examples of the element have a thickness to width ratio of approximately 1 : 50 (Priddy et al, 2019).…”

Section: Fluvial Channel Elementsmentioning

confidence: 99%

“…Preservation of the full, fining upward element is rare and examples are typically truncated and eroded by basal fourth-order surfaces from either other elements of this type, or from fluvial channel elements. The lateral extents of these elements can range between 250 m and 400 m, with thicknesses of no more than 5 m, giving a thickness to width ratio of approximately 1 : 100 (Priddy et al, 2019) when the full lateral and vertical extent of the element was preserved.…”

Section: Fluvial Sheet-like Elementsmentioning

confidence: 99%

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The sedimentology of an ephemeral fluvial–aeolian succession

Priddy

Clarke

2020

Sedimentology

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Ephemeral fluvial systems are commonly associated with arid to semi‐arid climates. Although their complex sedimentology and depositional settings have been described in much detail, depositional models depicting detailed lateral and vertical relationships, and interactions with coeval depositional environments, are lacking compared to well‐recognized meandering and braided fluvial systems. This study critically evaluates the applicability of current models for ephemeral fluvial systems to an ancient arid fluvial example of the Lower Jurassic Kayenta Formation of the Colorado Plateau, USA. The study employs detailed sedimentary logging, palaeocurrent analysis and photogrammetric panels across the regional extent of the Kayenta. A generic model that accounts for the detailed sedimentology of a sandy arid ephemeral fluvial system (drawing upon both ancient and geomorphological studies) is developed, along with analysis of the spatial and temporal interactions with the aeolian setting. Results show that the ephemeral system is dominated by laterally and vertically amalgamated, poorly channelized to sheet‐like elements, with abundant upper flow regime flat beds and high sediment load structures formed between periods of lower flow regime conditions. Through interaction with a coeval aeolian system, most of the fluvial deposits are dominated by sand‐grade sediment, unlike many modern ephemeral fluvial systems that contain a high proportion of conglomeratic and/or finer grained mudstone and siltstone deposits. During dominantly fluvial deposition, high width to thickness ratios are observed for channelized and sheet‐like elements. However, with increasing aridity, the aeolian environment becomes dominant and fluvial deposition is restricted to interdune corridors, resulting in lower width to thickness ratio channels dominated by flash‐flood and debris‐flow facies. The data presented here, coupled with modern examples of ephemeral systems and flood regimes, suggest that ephemeral flow produces and preserves distinctive sedimentological traits that can not only be recognized in outcrops, but also within core.

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Section: Fluvial Channel Elementsmentioning

confidence: 99%

Section: Fluvial Sheet-like Elementsmentioning

confidence: 99%

The sedimentology of an ephemeral fluvial–aeolian succession

Priddy

Clarke

2020

Sedimentology

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“…The dimensions of partial or incomplete elements within models have been approximated using methods outlined by Geehan & Underwood (1993). For further detail on the methods of photogrammetric analysis used within this work, the reader is referred to Priddy et al ., 2019.…”

Section: Methodsmentioning

confidence: 99%

Spatial variation in the sedimentary architecture of a dryland fluvial system

Priddy

Clarke

2021

Sedimentology

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Ancient dryland terminal fluvial systems are often recognized within the rock record for having a progressive downstream decrease in the size and amalgamation of channel elements and systematic downstream increase in sheet and overbank elements, alongside the downstream decrease in grain size that is displayed by most fluvial systems. The spatial distribution and downstream trends displayed by the fluvial sediments of the Lower Jurassic Kayenta Formation of south-western USA, have been examined quantitatively. The results indicate many trends that are similar to those of a dryland terminal fluvial system, including; a lack of confinement of the fluvial system, a downstream decrease in channel and sheet element amalgamation and width-to-thickness ratios, a downstream decrease in grain size, albeit very small, and an increase in the percentage of overbank elements downstream. However, the study highlights several downstream relationships that are atypical. While some of these relationships may be the result of external factors inherent in this study, others, including the thicknesses of channelfill and sheet elements that display no significant relationships to distance downstream, and channel-fill elements that display no significant variation in average grain size with distance downstream, may be a consequence of fluvial interaction with a competing and coeval aeolian system. This work demonstrates the inherent complexity in arid dryland fluvial systems and the downstream architectural and compositional relationships that they depict. Consequently, models for fluvial style may provide only a first-order approximation for downstream trends in dryland systems, because the controlling factors upon these systems are inherently difficult to unravel, and the sedimentary detail is strongly dependent upon external setting and internal complexity. Consequently, a generalized model may not always be applicable to these systems.

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“…Programmed flights are key to workin g with d rones in a professional way, as they allow performing automated actions that lead to a photogrammetric output, that is to say, an aerial image that is geometrically correct (e.g. Nobajas et al, 2017 andPriddy et al, 2019). In combination with theoretical and computer-based sessions, the gathered data are processed using Structure from Motion (SfM) software and an accurate 3D model is generated (Nobajas et al, 2017).…”

Section: Campus As a Classroom Case Study 4: Drone Technologymentioning

confidence: 99%

The University Campus as a Learning Environment: the role of a Campus-based Living Lab in a Blended Teaching and Learning Environment

Rogers

Jeffery

Pringle

et al. 2021

Preprint

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Abstract. “Living Labs” provide stakeholders with an authentic and spontaneous environment in which innovations and technologies can be developed. This paper highlights the use of Living Labs as an educational teaching and learning environment. We give examples of practice currently used and present a conceptual framework for pedagogic design of activities and assessment in a Living Lab environment. The examples provided are based around current HE under/post-graduate taught assessment and activities. We suggest that Living Labs, particularly campus based Living Labs, are an excellent opportunity for education providers to provide experiences for students that are realistic, promote empowerment of students, and are spontaneous, promoting student inclusivity and sustainability. Living Labs can introduce opportunities for inter- and transdisciplinarity and cross-cultural working and can provide an excellent base for education for sustainability.

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Application of photogrammetry to generate quantitative geobody data in ephemeral fluvial systems

Cited by 17 publications

References 32 publications

The sedimentology of an ephemeral fluvial–aeolian succession

The sedimentology of an ephemeral fluvial–aeolian succession

Spatial variation in the sedimentary architecture of a dryland fluvial system

The University Campus as a Learning Environment: the role of a Campus-based Living Lab in a Blended Teaching and Learning Environment

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