Distinct periods of fan aggradation and incision for tributary valleys of different sizes along the Bailong River, eastern margin of the Tibetan Plateau

Li, Yajun; Meng, Xingmin; Stevens, Thomas; Armitage, Simon; Bian, Shiqiang; Chen, Guan; He, Jinhai

doi:10.1016/j.geomorph.2020.107490

Cited by 5 publications

(1 citation statement)

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“…Rapid incision steepens hillslope to critical conditions that followed by an increase in mass movement from slope to river channel or even formation of knickpoints, e.g., landslide barrier dams (Ouimet et al, 2008;Dahlquist et al, 2018). In turn, slope gradient tends to reach a stable level as a result of the increase of sediment supplying to river and reduction of bed incision rate, which contributes to a steady-state topography (Mudd and Furbish, 2007;Wohl, 2010;Li et al, 2021). It is also indicated that mass movement rate is highly correlated to incision rate (Larsen and Montgomery, 2012), implying that stream bed incision could be a driving force for hillslope morphology (Mudd and Furbish, 2007;Korup et al, 2010;Chang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Landslides of Loose Sediment Slope Induced by Stream Bed Incision

Huang

Wang

2021

Front. Earth Sci.

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Uplift of the Qinghai-Tibetan Plateau has resulted in rapid incision of rivers along the margin of the plateau. Landslides occur frequently as a consequence of increasing bank slope and potential landslide energy due to stream bed incision or lateral bank erosion on the concave banks at bends. The Fencha Gully is on the eastern margin of the Qinghai-Tibetan Plateau and is developing on a huge landslide body. Flume experiments were conducted on the base of the field investigation to study the mechanism of landslides induced by stream bed incision. The experiments were designed with a length scale ratio of 1:20. Landslides and stream bed incision with loose sediment were observed and analyzed. The results show that landslides are induced as a result of stream bed incision. The potential landslide energy is defined, which increases quickly with an effective incision depth coupling vertical incision and lateral bank erosion. The occurrence of landslides can be attributed to increasing incision depth and potential landslide energy. Results indicate that the critical effective incision depth is 4.0–6.0 m. A critical value of the potential landslide energy is found from the experiments. Landslides occur if the potential energy exceeds the critical energy, which is 2.24×104 t·m/s2 for the Fencha Gully. The incision depth and potential energy of landslides from the Fencha Gully agree well with the results.

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