断层水平错动下河流演变过程的数值模拟研究

Abstract

Abstract: Fluvial landform and stream pattern have obvious responses to active tectonics, we should be able to use the landscape as an archive of the active tectonics. In order to better understand the river evolution with left-lateral strike-slip faulting, we use numerical simulation based on the geomorphic evolution theory to model channel evolution. The tectonic lateral-displaced rate and rainfall factors are the main elements controlling the landform development. Initial numerical results demonstrate quantitatively dynamic evolution processes of a channel under interactions between lateral-displaced faulting and water erosion. Numerical results suggest strong coupling effects between stream patterns and active strike-slip faults. The channel pattern becomes bending, because both sides of the stream generate relative lateral-displacement under influence of strike-slip faulting. The whole stream channel is continuously widenly because of lateral water erosion. A lot of sediment accumulated at the right side of the downstream, however, the left side of upstream is difficult to deposit sediment because of the strong water erosion. The results also demonstrate an clear asymmetry of the two sides of the downstream, but the two sides of the upstream still show obvious symmetry. Profile elevation at the fault increases abruptly, and the slope suddenly become steepening. Based on more reasonable numerical model, numerical simulation can be applied more effectively to quantitative analysis of typical regional geomorphic evolution.

Key words: River evolution, Geomorphic evolution, Strike-slip fault, Numerical simulation

CLC Number:

P315

YAN Zhen-zhen, ZHANG Huai, FAN Xiang-tao, DU Xiao-ping, SHI Yao-lin. Numerical Simulation of River Evolution Processes under Strike-slip Faulting[J]. EARTHQUAKE, 2013, 33(4): 105-114.

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Numerical Simulation of River Evolution Processes under Strike-slip Faulting

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