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• W1569122187 abstract "A time-series of very high resolution digital elevation models (DEMs) of a braided reach of the Rees River, NZ were derived from a novel combination of mobile terrestrial laser scanning (TLS) and image analysis of non-metric aerial photography. In total 10 DEMs were generated from surveys undertaken between October 2009 and May 2010 and used to quantify the 3D morphodynamics of the Rees River. The surveys involved between 86-356 individual laser scans that were acquired using a Leica HDS6100 high-frequency TLS while the braidplain was exposed at low flow. Scans were co-registered and georeferenced using a mobile network of targets positioned using RTK GPS. The unified point clouds incorporated over 4 x 10 raw 3D observations, with a median point density of 1600 pts m. Continuous topographic models of the braidplain were generated by fusing these data with empirical-optical depth maps of submerged areas of the reach, derived from calibrated, geo-referenced, helicopter aerial photography. DEMs and derived products were extracted from this combined product at resolutions ranging from 0.1-1 m resolutions, providing unparalleled information on the morphology, sedimentology and dynamics of braided rivers. 1. BACKGROUND Loan 982 provided Leica 1200 GPS instrumentation to support the acquisition of field data associated with NERC Standard Grant (NE/G005427/1). This grant in turn, provided funds to purchase a Leica HDS6100 terrestrial laser scanner that was donated to the GEF on completion of the research. The overarching project, ReesScan, aimed to develop a field-to-product workflow to generate hyper-resolution 3D models that could provide new insights into the form and dynamics of braided channels and aid the development of quantitative models of sediment transport in large, labile, gravel-bed rivers. 1.1 The Study Area Research focused on a 2.7 x 0.7 km piedmont reach of the Rees River (44.788 S, 168.397 E) where high rates of sediment supply associated with rapid uplift, erodible schistose lithologies and high annual rainfall give rise to a wide, gravel-bed, multi-thread channel (Figure 1). Flows were gauged at a constrained section 6 km upstream, using a combination of continuous acoustic Doppler velocimetry and stage-discharge calibration. A 1D hydraulic model was used to relate this record to predict the upstream boundary flux on the experimental reach. During the study period (October 2009 – May 2010), the mean flow of the Rees was 18 m s and 10 major floods were observed with peak flows that varied from 43 to 403 m s – the latter corresponding to a 0.1 annual exceedance probability. At low flow (~10 m s) approximately 90% of the braidplain was subaerially exposed, and the submerged channels were typically less than 0.5 m deep and water turbidity was low. By contrast, at flows above 100 m s, over 70% of the reach was inundated. Figure 1. Location map showing the study area, the experimental reach delimited by the bounding polygon and the network of established geodetic survey marks NERC Geophysical Equipment Facility View more reports on our website at http://gef.nerc.ac.uk/reports.php" @default.
• W1569122187 created "2016-06-24" @default.
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• W1569122187 date "2015-01-01" @default.
• W1569122187 modified "2023-09-22" @default.
• W1569122187 title "Hyperscale Modelling of Braided Rivers: linking morphology, sedimentology and sediment transport" @default.
• W1569122187 hasPublicationYear "2015" @default.
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