Trace projection transformation: a new method for measurement of debris flow surface velocity fields

Yan, Yan; Cui, Peng; Guo, Xiaojun; Ge, Yong

doi:10.1007/s11707-015-0576-6

Cited by 9 publications

(3 citation statements)

References 33 publications

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“…The maximum velocity ( V max ) was estimated in the measured vertical profiles of the channel cross‐section on the basis of entropy and probability concepts in hydraulics (Chen, ). The surface velocity ( V s ) was measured by the noncontact radar Doppler flow metres and video trace projection and transformation (TPT) method (Yan, Cui, Guo, & Ge, ).…”

Section: Methodsmentioning

confidence: 99%

Real‐time monitoring and estimation of the discharge of flash floods in a steep mountain catchment

Zhang

Cui

Yin

et al. 2019

Hydrological Processes

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Synchronously and accurately estimating the flood discharges and dynamic changes in the fluid density is essential for hydraulic analysis and forecasting of flash floods, as well as for risk assessment. However, such information is rare for steep mountain catchments, especially in regions that are hotspots for earthquakes. Therefore, six hydrological monitoring sites were established in the main stream and tributaries of the 78.3-km 2 Longxi River catchment, an affected region of the Wenchuan earthquake region in China. Direct real-time monitoring equipment was installed to measure the flow depths, velocities, and fluid total pressures of the flood hydrographs. On the basis of field measurements, real-time mean cross-sectional velocities during the flood hydrographs could be derived from easily obtainable parameters: crosssectional maximum velocities and the calibrated dimensionless parameter K h . Realtime discharges were determined on the basis of a noncontact method to establish the effective rating curves of this mountainous stream, ranging from 1.46 to 386.34 m 3 /s with the root mean square errors of ≤10.22 m 3 /s. Compared with the traditional point-velocity method and empirical Manning's formula, the proposed noncontact method was reliable and safe for monitoring whole flood hydrographs. Additionally, the real-time fluid density during the flood hydrographs was calculated on the basis of the direct monitoring parameters for fluid total pressures and water depths. During the flood hydrograph, transient flow behaviour with higher fluid density generally occurred downstream during the flood peak periods when the flow was in the supercritical flow regime. The observed behaviour greatly increased the threat of damage to infrastructure and human life near the river. Thus, it is important to accurately estimate flood discharge and identify for fluid densities so that people at risk from an impending flash flood are given reliable, advanced warning. K E Y W O R D S discharge estimation, flash floods, flow regime, fluid density, real-time monitoring, steep mountain catchment

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Section: Methodsmentioning

confidence: 99%

Real‐time monitoring and estimation of the discharge of flash floods in a steep mountain catchment

Zhang

Cui

Yin

et al. 2019

Hydrological Processes

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“…Landslide inventories that include several temporal scenes before and after earthquakes are much less common. In fact, the interest around the temporal evolution of landsliding after major earthquakes has increased greatly in the past decades, particularly after the 1999 M w 7.7 Chi-Chi and 2008 M w 7.9 Wenchuan earthquakes (Dadson et al, 2004;Fan et al, 2018a, b;Hovius et al, 2011;Tang et al, 2016;Yang et al, 2017Yang et al, , 2018Zhang et al, 2016;Zhang and Zhang, 2017) and has the potential to answer various research questions concerning, for instance, erosional patterns and morphological signatures in seismically active mountain ranges. Research has been facilitated by the increased availability of repeated and high-resolution remotesensing images (Fan et al, 2018b) and by near-real-time monitoring networks (Huang et al, 2015).…”

Section: Multi-temporal Inventorying Of Landslidesmentioning

confidence: 99%

“…It is worth noting that, in contrast to earlier works Yang et al, 2017;Zhang et al, 2016), we quantified changes of the level of activity based on the actual polygonmapping of the remobilised areas ( Fig. 5), discriminated between different types of landslides and their location and investigated a much larger and more representative area.…”

Section: Imagery Mapping Technique Attributesmentioning

confidence: 99%

Two multi-temporal datasets that track the enhanced landsliding after the 2008 Wenchuan earthquake

Fan¹,

Scaringi²,

Domènech³

et al. 2019

Earth Syst. Sci. Data

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110

105

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Abstract. We release two datasets that track the enhanced landsliding induced by the 2008 Mw 7.9 Wenchuan earthquake over a portion of the Longmen Mountains, at the eastern margin of the Tibetan Plateau (Sichuan, China). The first dataset is a geo-referenced multi-temporal polygon-based inventory of pre- and coseismic landslides, post-seismic remobilisations of coseismic landslide debris and post-seismic landslides (new failures). It covers 471 km2 in the earthquake's epicentral area, from 2005 to 2018. The second dataset records the debris flows that occurred from 2008 to 2017 in a larger area (∼17 000 km2), together with information on their triggering rainfall as recorded by a network of rain gauges. For some well-monitored events, we provide more detailed data on rainfall, discharge, flow depth and density. The datasets can be used to analyse, on various scales, the patterns of landsliding caused by the earthquake. They can be compared to inventories of landslides triggered by past or new earthquakes or by other triggers to reveal common or distinctive controlling factors. To our knowledge, no other inventories that track the temporal evolution of earthquake-induced mass wasting have been made freely available thus far. Our datasets can be accessed from https://doi.org/10.5281/zenodo.1405489. We also encourage other researchers to share their datasets to facilitate research on post-seismic geological hazards.

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Comprehensive study of the Beijing Daanshan rockslide based on real-time videos, field investigations, and numerical modeling

Zhou

Ouyang

et al. 2020

Landslides

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Trace projection transformation: a new method for measurement of debris flow surface velocity fields

Cited by 9 publications

References 33 publications

Real‐time monitoring and estimation of the discharge of flash floods in a steep mountain catchment

Real‐time monitoring and estimation of the discharge of flash floods in a steep mountain catchment

Two multi-temporal datasets that track the enhanced landsliding after the 2008 Wenchuan earthquake

Comprehensive study of the Beijing Daanshan rockslide based on real-time videos, field investigations, and numerical modeling

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