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Driving effects of dynamic geomorphologic environments on gravitational erosion hazards: a case of the Baihetan drainage area of the Jinsha River, China
https://orcid.org/0000-0002-5023-7431
Abstract Exploring the long-term mechanism of hazard formation and identifying prospective hazard areas is critical for human survival and the risk management of crucial engineering facilities. Detecting the relationships between tectonic uplift, stream incision, and hazards is the basis for solving these problems, but these relationships are always tricky to determine quantitatively. Using the Baihetan drainage area on the eastern margin of the Qinghai-Tibet Plateau in western China as a case study, we proposed a set of methods to establish and analyze the quantitative relationships between the intensity of tectonic uplift and river incision, as well as the spatial density of gravitational erosion hazards, based on the hypsometric integral (HI), steepness index (ksn), stream power gradient (ω), and steady-state coefficient. We discovered that the collapses, landslides, debris flows, and other hazards in the Baihetan drainage area are generally distributed along the extensive river valley with HI values of 0.3–0.5. Potential gravitational erosion hazards in the region are concentrated in areas where the competition between tectonic uplift and stream power is weak because there is a delay in or anticipation of the response of hazard generation to uplift and incision. When the channel profiles in a basin develop toward a steady or transient state, there is an increase in the number of gravitational erosion hazards, such as collapses, landslides, and debris flows. Therefore, transitional valleys present a lower hazard risk, including the Heishui, Qiaomaidi, Mahong, Mashu, and Yili Rivers. This knowledge deepens our understanding of the spatial variation in the basin’s driving forces for the long-term hazard formation process and provides essential reference values for further identifying the potentially hazardous sites.
Driving effects of dynamic geomorphologic environments on gravitational erosion hazards: a case of the Baihetan drainage area of the Jinsha River, China
https://orcid.org/0000-0002-5023-7431
Abstract Exploring the long-term mechanism of hazard formation and identifying prospective hazard areas is critical for human survival and the risk management of crucial engineering facilities. Detecting the relationships between tectonic uplift, stream incision, and hazards is the basis for solving these problems, but these relationships are always tricky to determine quantitatively. Using the Baihetan drainage area on the eastern margin of the Qinghai-Tibet Plateau in western China as a case study, we proposed a set of methods to establish and analyze the quantitative relationships between the intensity of tectonic uplift and river incision, as well as the spatial density of gravitational erosion hazards, based on the hypsometric integral (HI), steepness index (ksn), stream power gradient (ω), and steady-state coefficient. We discovered that the collapses, landslides, debris flows, and other hazards in the Baihetan drainage area are generally distributed along the extensive river valley with HI values of 0.3–0.5. Potential gravitational erosion hazards in the region are concentrated in areas where the competition between tectonic uplift and stream power is weak because there is a delay in or anticipation of the response of hazard generation to uplift and incision. When the channel profiles in a basin develop toward a steady or transient state, there is an increase in the number of gravitational erosion hazards, such as collapses, landslides, and debris flows. Therefore, transitional valleys present a lower hazard risk, including the Heishui, Qiaomaidi, Mahong, Mashu, and Yili Rivers. This knowledge deepens our understanding of the spatial variation in the basin’s driving forces for the long-term hazard formation process and provides essential reference values for further identifying the potentially hazardous sites.
Driving effects of dynamic geomorphologic environments on gravitational erosion hazards: a case of the Baihetan drainage area of the Jinsha River, China
https://orcid.org/0000-0002-5023-7431
Abstract Exploring the long-term mechanism of hazard formation and identifying prospective hazard areas is critical for human survival and the risk management of crucial engineering facilities. Detecting the relationships between tectonic uplift, stream incision, and hazards is the basis for solving these problems, but these relationships are always tricky to determine quantitatively. Using the Baihetan drainage area on the eastern margin of the Qinghai-Tibet Plateau in western China as a case study, we proposed a set of methods to establish and analyze the quantitative relationships between the intensity of tectonic uplift and river incision, as well as the spatial density of gravitational erosion hazards, based on the hypsometric integral (HI), steepness index (ksn), stream power gradient (ω), and steady-state coefficient. We discovered that the collapses, landslides, debris flows, and other hazards in the Baihetan drainage area are generally distributed along the extensive river valley with HI values of 0.3–0.5. Potential gravitational erosion hazards in the region are concentrated in areas where the competition between tectonic uplift and stream power is weak because there is a delay in or anticipation of the response of hazard generation to uplift and incision. When the channel profiles in a basin develop toward a steady or transient state, there is an increase in the number of gravitational erosion hazards, such as collapses, landslides, and debris flows. Therefore, transitional valleys present a lower hazard risk, including the Heishui, Qiaomaidi, Mahong, Mashu, and Yili Rivers. This knowledge deepens our understanding of the spatial variation in the basin’s driving forces for the long-term hazard formation process and provides essential reference values for further identifying the potentially hazardous sites.
Driving effects of dynamic geomorphologic environments on gravitational erosion hazards: a case of the Baihetan drainage area of the Jinsha River, China
Gu, Zhenkui (author) / Yao, Xin (author) / Li, Chenggang (author) / Zhu, Xuchao (author)
2023
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
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