Journal ArticleDOI
Through‐water terrestrial laser scanning of gravel beds at the patch scale
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TLDR
In this article, through-water terrestrial laser scanning (TLS) has been used to provide high resolution digital elevation models of submerged gravel beds with enough detail to depict individual grains and small-scale forms.Abstract:
Acquiring high resolution topographic data of natural gravel surfaces is technically demanding in locations where the bed is not exposed at low water stages. Often the most geomorphologically active surfaces are permanently submerged. Gravel beds are spatially variable and measurement of their detailed structure and particle sizes is essential for understanding the interaction of bed roughness with near-bed flow hydraulics, sediment entrainment, transport and deposition processes, as well as providing insights into the ecological responses to these processes. This paper presents patch-scale laboratory and field experiments to demonstrate that through-water terrestrial laser scanning (TLS) has the potential to provide high resolution digital elevation models of submerged gravel beds with enough detail to depict individual grains and small-scale forms. The resulting point cloud data requires correction for refraction before registration. Preliminary validation shows that patch-scale TLS through 200 mm of water introduces a mean error of less than 5 mm under ideal conditions. Point precision is not adversely affected by the water column. The resulting DEMs can be embedded seamlessly within larger sub-aerial reach-scale surveys and can be acquired alongside flow measurements to examine the effects of three-dimensional surface geometry on turbulent flow fields and their interaction with instream ecology dynamics. Copyright © 2011 John Wiley & Sons, Ltd.read more
Citations
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Journal ArticleDOI
Quantifying submerged fluvial topography using hyperspatial resolution UAS imagery and structure from motion photogrammetry
TL;DR: In this article, a rotary-winged Unmanned Aerial System (UAS) was used to produce digital elevation models (DEMs) with hyperspatial resolutions (c.10m to a few hundredm).
Journal ArticleDOI
Review of Earth science research using terrestrial laser scanning
TL;DR: The application of advanced remote sensing technologies, including terrestrial laser scanning (TLS), to the Earth sciences has increased rapidly in the last two decades, improving the spatial and temporal resolution of data as mentioned in this paper.
Journal ArticleDOI
Hyperscale terrain modelling of braided rivers: fusing mobile terrestrial laser scanning and optical bathymetric mapping
TL;DR: In this paper, the authors present a novel survey methodology that combines mobile terrestrial laser scanning and non-metric aerial photography with data reduction and surface modelling techniques to render DEMs from the resulting very high resolution datasets.
Journal ArticleDOI
Topo-Bathymetric LiDAR for Monitoring River Morphodynamics and Instream Habitats—A Case Study at the Pielach River
TL;DR: Methods for enhanced modeling and monitoring of instream meso- and microhabitats based on multitemporal data acquisition and a novel approach for modeling the water surface in the case of sparse water surface echoes are presented.
Journal ArticleDOI
A methodological intercomparison of topographic survey techniques for characterizing wadeable streams and rivers
TL;DR: In this article, the relative quality and the amount of effort spent collecting data to derive bare earth topography from an array of ground-based and airborne survey techniques were quantified and compared across a diverse range of wadeable streams.
References
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Journal ArticleDOI
Accounting for uncertainty in DEMs from repeat topographic surveys: improved sediment budgets
TL;DR: In this paper, the authors present an accounting for uncertainty in DEMs from repeat topographic surveys: improved sediment budgets, which can be used to improve the quality of topographic data.
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Measurement of the refractive index of distilled water from the near-infrared region to the ultraviolet region
Masahiko Daimon,Akira Masumura +1 more
TL;DR: By the minimum deviation method using a prism shaped cell, the absolute refractive indices of high-performance liquid chromatography distilled water were measured at the wavelengths from 1129 to 182 nm, at the temperature of 19 degrees C, 21.5 degrees C; and the coefficients of the four-term Sellmeier dispersion formula were determined by using theRefractive indices at each temperature.
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Estimation of erosion and deposition volumes in a large, gravel‐bed, braided river using synoptic remote sensing
TL;DR: In this article, the authors developed a methodology for channel change detection, coupled with the use of synoptic remote sensing, for erosion and deposition estimation, and applied it to a wide, braided, gravel-bed river.
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Methodological sensitivity of morphometric estimates of coarse fluvial sediment transport
TL;DR: In this article, the authors present results of recent research in which digital elevation models (DEMs) have been developed for a reach of a large braided gravel-bed river in Scotland using both digital photogrammetry and high-resolution RTK GPS ground surveys.
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Monitoring and modelling morphological change in a braided gravel-bed river using high resolution GPS-based survey
TL;DR: In this article, the authors present an alternative approach to the study of three-dimensional morphological dynamics of a divided reach of the gravelly River Feshie, in which topographic survey of both exposed and submerged areas of the reach was undertaken using the Global Positioning System (GPS).