Lateral Connectivity of Landslides and its Influence on Sediment Yield of Slope-Channel Cascade Under Heavy Rainstorm on the Loess Plateau

Medientyp: E-Book

Titel: Lateral Connectivity of Landslides and its Influence on Sediment Yield of Slope-Channel Cascade Under Heavy Rainstorm on the Loess Plateau

Beteiligte: Yan, Xiqin [VerfasserIn]; Jiao, Juying [VerfasserIn]; LI, Mengmeng [VerfasserIn]; QI, Hongkun [VerfasserIn]; LIANG, Yue [VerfasserIn]; XU, Qian [VerfasserIn]; ZHANG, Ziqi [VerfasserIn]; JIANG, Xiaohan [VerfasserIn]; LI, Jianjun [VerfasserIn]; ZHANG, Zhixin [VerfasserIn]; WANG, Haolin [VerfasserIn]

Erschienen: [S.l.]: SSRN, [2022]

Umfang: 1 Online-Ressource (38 p)

Sprache: Englisch

DOI: 10.2139/ssrn.4029412

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Anmerkungen: In: CATENA17138

Beschreibung: The rate at which sediment from the landscape is recruited to channel networks reflects lateral geomorphic connectivity and has significant implications for the hydrological processes of the catchment. The main objective of this research was to quantify the lateral sediment connectivity of landslides and explore the relationship between sediment connectivity of landslides and sediment yield on slope-channel cascades. We combined the fieldwork and unmanned aerial vehicle techniques to map all landslide inventories and calculate the soil erosion amount of landslides. We put forward a new lateral sediment connectivity index (LCI), which considers the landslide area density, landslide connected characteristics, and transport distance to quantify lateral sediment connectivity of landslides and explore whether earlier landslides affect sediment yield in slope-channel cascades through legacy effects. Results showed that the area of landslides ranged from 0.2 m 2 to 1100.07 m 2 , and the soil erosion amount of landslides ranged from 0.21 t to 1690.81 t. We found lateral sediment connectivity of landslides was more closely related to sediment yield of slope-channel cascades after the rainstorm. It was indicated LCI is a good index to quantify the effect of lateral sediment connectivity on sediment yield in the catchment. We also found that the landslides generated by the heavy rainstorm have a long-term impact on the sediment transport process in the catchment. Regarding slope management, we suggest protecting the gully slope by reducing the lateral sediment connectivity between the upslope area and gully slope. For terrace slopes, the border dikes and drainage ditches need to be built to reduce slope collapse under heavy rainstorms

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