Journal
EARTH SURFACE PROCESSES AND LANDFORMS
Volume 39, Issue 2, Pages 167-183Publisher
WILEY
DOI: 10.1002/esp.3437
Keywords
bathymetric mapping; braided river; morphodynamics; terrestrial laser scanning; water surface mapping
Funding
- UK NERC [NE/G005427/1]
- NERC Geophysical Equipment Facility award [GEF 892]
- New Zealand's Foundation for Science and Technology Grant [C01X0308]
- Spain's Ministry of Science and Innovation's Jose Castillejo travel fund
- Ramon y Cajal Fellowship [RYC-2010-06264]
- Spanish Ministry of Science and Innovation
- Aberystwyth University Postgraduate Research Studentship
- NERC [NE/M005054/1, NE/G005427/1] Funding Source: UKRI
- Natural Environment Research Council [NE/M005054/1, NE/G005427/1] Funding Source: researchfish
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Quantifying the morphology of braided rivers is a key task for understanding braided river behaviour. In the last decade, developments in geomatics technologies and associated data processing methods have transformed the production of precise, reach-scale topographic datasets. Nevertheless, generating accurate Digital Elevation Models (DEMs) remains a demanding task, particularly in fluvial systems. This paper identifies a threefold set of challenges associated with surveying these dynamic landforms: complex relief, inundated shallow channels and high rates of sediment transport, and terms these challenges the morphological', wetted channel' and mobility' problems, respectively. In an attempt to confront these issues directly, this paper presents 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. The approach is used to generate and model a precise, dense topographic dataset for a 2.5km reach of the braided Rees River, New Zealand. Data were acquired rapidly between high flow events and incorporate over 5 x 10(9) raw survey observations with point densities of 1600 pts m(-2) on exposed bar and channel surfaces. A detailed error analysis of the resulting sub-metre resolution is described to quantify DEM quality across the entire surface model. This reveals unparalleled low vertical errors for such a large and complex surface model; between 0.03 and 0.12m in exposed and inundated areas of the model, respectively. Copyright (c) 2013 John Wiley & Sons, Ltd.
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