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You are here: Home » Latest Issue » Volume 15, 2020 - Number 2 » A COMPARISON OF TWO BEDROCK RIVER STREAM-POWER EROSION MODELS: A CASE STUDY OF THE RIVER PROFILE OF THE GYIRONG WATERSHED IN THE MIDDLE HIMALAYAN OROGEN, Carpathian Journal of Earth and Environmental Sciences, August 2020, Vol. 15, No. 2, p. 429 – 441; Doi:10.26471/cjees/2020/015/142


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Lu CHEN1,2, Aike KAN3,*, Guiping DENG3, Jianxiong QIN4, Qinghong RAN1 & Jun HE5
1Institute of Humanity Resources in Western China, Chengdu Normal University, Chengdu 611130, China
2Institute of Science & Technology Information of Tibet Autonomous Region, Lhasa 850001, China
3College of Tourism and Urban-Rural Planning, Chengdu University of Technology, Chengdu 610059, China, *Coresponding author email kanaike@cdut.edu.cn, 13408572118
4College of Historical Culture and Tourism, Southwest Minzu University, Chengdu 610059, China
5Shannan Branch of Hydrology and Water Resources Survey Bureau of Tibet Autonomous Region, Shannan 856000, China


A COMPARISON OF TWO BEDROCK RIVER STREAM-POWER EROSION MODELS: A CASE STUDY OF THE RIVER PROFILE OF THE GYIRONG WATERSHED IN THE MIDDLE HIMALAYAN OROGEN, Carpathian Journal of Earth and Environmental Sciences, August 2020, Vol. 15, No. 2, p. 429 – 441; Doi:10.26471/cjees/2020/015/142

Full text

Abstract:

The models for quantitative study of bedrock river are two typical representatives: the Distance-slope (DS) Model and the Area-slope (AS) Model. The AS model introduces the law of the matter conservation and builds a bridge between tectonic uplift and erosion. In recent decade, AS has been widely used in the longitudinal profile simulation of bedrock and alluvial rivers, but many applications have failed to carefully consider the mechanism, fitting effect, and applicability of the resulting models, resulting in unsatisfactory simulation results. In order to verify the channel profile analysis capability of the two models, the study compared the theoretical basis and the applications of channel fitting and knickpoint identification made in the Gyirong Watershed in the middle Himalayan Orogen. It is believed that if the river meets the equilibrium condition, both models reflect the law of the matter conservation, instead of being limited to the AS. The results show that, for rivers with different equilibrium status, the two have different numerical responses on 7 bedrock rivers. The AS model has a comparative advantage in river channels with a higher degree of equilibrium, while the DS model is more suitable for longer rivers in a disequilibrium state. Finally, we applied DS model to the Gyirong Zangbo River in order to analyze the numerical characteristics of the knickzone parameters. It is found that the distribution of concave-convex intersection on the profile corresponds to the variation of the fast and slow erosion rate. This characteristic reflects the interaction between the river erosion and sedimentation in the Gyirong Watershed and is sensitive to the formation processes of the differentiated climate patterns over the past 2 Ma



Keyword: Bedrock River; Stream-Power Erosion Models; river-fitting; knickpoint; Gyirong Watershed


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