Back analysis of the breach flood of the &amp;ldquo;11.03&amp;rdquo; Baige barrier lake at the Upper Jinsha River

Lin, Wen‐Lang; Chen, Zuyu; Zhang, Qiang; Chen, Shengshui; Jin, Songli; Zhong, Qiming

doi:10.1360/sst-2019-0297

Cited by 8 publications

(1 citation statement)

References 4 publications

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“…For breach development, the simulation was run to calculate the volumetric bed change using time steps of 0.2 s. The volume change can then be converted to bed change and width change along the breach cross‐section, which involves the sediment collapse/mass failure of breach side slopes (Figure S1 in Supporting Information S1). Since there are already sufficient field surveys, laboratory experiments, and numerical simulations on this dam breach (e.g., Chen et al., 2020; Zhong et al., 2020), the key input parameters used to simulate the dam breach are well documented and are listed in Table S2 in Supporting Information S1. For the less well‐constrained input parameters such as porosity and adaption coefficient, while changes in these parameters affect the temporal evolution of discharge and sediment transport, the peak sediment transport always preceded peak in measured discharge by hours (Figure S2 in Supporting Information S1).…”

Section: Methodsmentioning

confidence: 99%

Seismic Monitoring and Geomorphic Impacts of the Catastrophic 2018 Baige Landslide Hazard Cascades in the Tibetan Plateau

Zhang,

Tan,

Walter

et al. 2024

JGR Earth Surface

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Surface hazards can form hazard cascades which expand their reach. However, our understanding of their complex dynamics and ability to mitigate their impacts remain limited. In 2018, two landslides dammed the Jinsha River in the Tibetan plateau and formed landslide‐dammed lakes. Subsequent dam breaches prompted the evacuation of >120,000 people. An early warning system for floods using a regional seismic network has been proposed on the basis of catastrophic floods having been detected ∼100 km away, with seismic energy proportional to discharge. Surprisingly, we find that this catastrophic outburst flood was undetectable beyond a few kilometers, with peak seismic energy preceding peak discharge. We propose that river channel stability also controls seismic energy generation and should be considered for accurate monitoring of catastrophic floods. In contrast, we find that the various processes during dam breach can be well‐characterized seismically further away and provide warning ∼60 min before discharge exceeds monsoon flood levels. We also show that numerical modeling of dam breaches which typically lacks in situ measurements can benefit from incorporating seismic data as constraints. Finally, we show that this event drastically increased sediment fluxes ∼670 km downstream for years and may significantly reduce the capacity of hydropower plants. Our results reveal ways to improve early warning of catastrophic outburst floods and the need to consider surface hazards' long‐term impact when managing infrastructure in mountainous regions.

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Section: Methodsmentioning

confidence: 99%