Monitoring channel responses to flood events of low to moderate magnitudes in a bedrock-dominated river using morphological budgeting by terrestrial laser scanning

Brierley, Gary; Chang, Yo-Ho

doi:10.1016/j.geomorph.2015.01.019

Cited by 20 publications

(16 citation statements)

References 63 publications

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“…Larger floods (with a return period longer than two years) induce a complete reworking of the network configuration rather than a few changes on active branches, as in the case of annual floods (see also [26]). Similar findings were found in our study; events of differing magnitudes play different roles in forming the channel morphology [27].…”

Section: The Influence Of Extreme Hydrological Eventssupporting

confidence: 92%

Channel Planform Dynamics Monitoring and Channel Stability Assessment in Two Sediment-Rich Rivers in Taiwan

Chen

Yang

et al. 2017

Water

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Recurrent flood events induced by typhoons are powerful agents to modify channel morphology in Taiwan's rivers. Frequent channel migrations reflect highly sensitive valley floors and increase the risk to infrastructure and residents along rivers. Therefore, monitoring channel planforms is essential for analyzing channel stability as well as improving river management. This study analyzed annual channel changes along two sediment-rich rivers, the Zhuoshui River and the Gaoping River, from 2008 to 2015 based on satellite images of FORMOSAT-2. Channel areas were digitized from mid-catchment to river mouth (~90 km). Channel stability for reaches was assessed through analyzing the changes of river indices including braid index, active channel width, and channel activity. In general, the valley width plays a key role in braided degree, active channel width, and channel activity. These indices increase as the valley width expands whereas the braid index decreases slightly close to the river mouth due to the change of river types. This downstream pattern in the Zhuoshui River was interrupted by hydraulic construction which resulted in limited changes downstream from the weir, due to the lack of water and sediment supply. A 200-year flood, Typhoon Morakot in 2009, induced significant changes in the two rivers. The highly active landscape in Taiwan results in very sensitive channels compared to other regions. An integrated Sensitivity Index was proposed for identifying unstable reaches, which could be a useful reference for river authorities when making priorities in river regulation strategy. This study shows that satellite image monitoring coupled with river indices analysis could be an effective tool to evaluate spatial and temporal changes in channel stability in highly dynamic river systems.

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Section: The Influence Of Extreme Hydrological Eventssupporting

confidence: 92%

Channel Planform Dynamics Monitoring and Channel Stability Assessment in Two Sediment-Rich Rivers in Taiwan

Chen

Yang

et al. 2017

Water

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“…This method of change detection utilises fuzzy logic to consider spatial variability in elevation uncertainty resulting from a number of survey and terrain characteristics and has been successfully employed by a number of recent geomorphological studies utilising multi-temporal DEMs for change detection analysis (e.g. Blasone et al, 2014;Kuo et al, 2015).…”

Section: Change Detection Analysismentioning

confidence: 99%

Quantifying erosion of ‘at risk’ archaeological sites using repeat terrestrial laser scanning

Kincey

Gerrard

Warburton

2017

Journal of Archaeological Science: Reports

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractEffective heritage management is reliant on an understanding of the range of current and potential future threats facing archaeological sites. Despite this, the processes leading to the loss of in situ archaeological remains are still poorly understood, including the rates, timing and drivers of surface erosion. This issue is particularly significant for abandoned historical metal mines in upland landscapes, where erosion rates are typically higher due to a combination of the unstable character of the archaeological deposits and the increased effectiveness of surface erosion processes. This study utilises repeat terrestrial laser scanning (TLS) to monitor the changing condition of two adjacent lead mines in the North Pennines, UK, over an 18 month period. The high spatial and temporal resolution of the TLS data, in conjunction with land cover characteristics derived from an unmanned aerial vehicle (UAV) survey, allows the detailed quantification of the causes and impacts of surface change.The results demonstrate that stream bank erosion is the process responsible for the most widespread and archaeologically significant damage, although localised gullying of mine waste heaps resulted in the largest volumetric loss of material (>160 m 3 ). Temporal variation in the erosion of upland archaeological sites is highly episodic, being dominated (>70%) by high magnitude but low frequency storm events. These results provide invaluable information regarding the causes and impacts of erosion of upland archaeological remains, as well as establishing a proven methodology which can now be applied to archaeological sites in other landscape contexts.

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“…This approach is commonly used in fluvial geomorphology studies (Kuo et al, 2015). The simplest approach assumes that both DEMs are GRID type and have identical position, number and size of cells.…”

Section: Vertical Changesmentioning

confidence: 99%

“…roughness) (Baewert et al, 2014) that impact fluvial transport. However, the goal of using TLS in such studies is the monitoring of the river bed changes, either shortterm (Picco et al, 2013;Williams et al, 2011) or long-term (Kuo et al, 2015). These changes are determined based on the Digital Elevation Models (DEMs) created from the data acquired periodically, and consequently, on the DEM of difference (DoD) between two analysed scanning epochs.…”

Section: Introductionmentioning

confidence: 99%

Monitoring of Fluvial Transport in the Mountain River Bed Using Terrestrial Laser Scanning

Jóźków

Borkowski

Kasprzak

2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:The fluvial transport is the surface process that has a strong impact on the topography changes, especially in mountain areas. Traditional hydrological measurements usually give a good understanding of the river flow, however, the information of the bedload movement in the rivers is still insufficient. In particular, there is limited knowledge about the movement of the largest clasts, i.e. boulders. This investigation addresses mentioned issues by employing Terrestrial Laser Scanning (TLS) to monitor annual changes of the mountain river bed. The vertical changes were estimated based on the Digital Elevation Model (DEM) of difference (DoD) while transported boulders were identified based on the distances between point clouds and RGB-coloured points. Combined RGB point clouds allowed also to measure 3D displacements of boulders. The results showed that the highest dynamic of the fluvial process occurred between years 2012-2013. Obtained DoD clearly indicated alternating zones of erosion and deposition of the sediment finer fractions in the local sedimentary traps. The horizontal displacement of the rock material in the river bed showed high complexity resulting in the displacement of large boulders (major axis about 0.8 m) for the distance up to 2.3 m.

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Monitoring channel responses to flood events of low to moderate magnitudes in a bedrock-dominated river using morphological budgeting by terrestrial laser scanning

Cited by 20 publications

References 63 publications

Channel Planform Dynamics Monitoring and Channel Stability Assessment in Two Sediment-Rich Rivers in Taiwan

Channel Planform Dynamics Monitoring and Channel Stability Assessment in Two Sediment-Rich Rivers in Taiwan

Quantifying erosion of ‘at risk’ archaeological sites using repeat terrestrial laser scanning

Monitoring of Fluvial Transport in the Mountain River Bed Using Terrestrial Laser Scanning

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