DOI: 10.1002/2017JF004393
Scopus记录号: 2-s2.0-85046658179
论文题名: Understanding the Role of Rainfall and Hydrology in Determining Fluvial Erosion Efficiency
作者: Deal E. ; Braun J. ; Botter G.
刊名: Journal of Geophysical Research: Earth Surface
ISSN: 21699003
出版年: 2018
卷: 123, 期: 4 起始页码: 744
结束页码: 778
语种: 英语
英文关键词: fluvial erosion
; geomorphology
; landscape evolution
; stochastic hydrology
; stream power model
Scopus关键词: climate forcing
; erosion rate
; fluvial deposit
; geomorphology
; hydrology
; landscape evolution
; rainfall
; streamflow
英文摘要: Due to the challenges in upscaling daily climatic forcing to geological time, physically realistic models describing how rainfall drives fluvial erosion are lacking. To bridge this gap between short-term hydrology and long-term geomorphology, we derive a theoretical framework for long-term fluvial erosion rates driven by realistic climate by integrating an established stochastic-mechanistic model of hydrology into a threshold-stochastic formulation of stream power. The hydrological theory provides equations for the daily streamflow probability distribution as a function of climatic boundary conditions. The new parameters introduced are rooted firmly in established climatic and hydrological theory. This allows us to account for how fluvial erosion rates respond to changes in rainfall intensity, frequency, evapotranspiration rates, and soil moisture dynamics in a way that is consistent with existing theories. We use this framework to demonstrate how hydroclimatic conditions and erosion threshold magnitude control the degree of nonlinearity between steepness index and erosion rate. We find that hydrological processes can have a significant influence on how erosive a particular climatic forcing will be. By accounting for the influence of hydrology on fluvial erosion, we conclude that climate is an important control on erosion rates and long-term landscape evolution. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114176
Appears in Collections: 气候减缓与适应
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作者单位: Institut des Sciences de la Terre, Universite Grenoble-Alpes, Saint-Martin-d'Hères, France; Helmholtz Centre Potsdam, GFZ German Research Center for Geosciences, Potsdam, Germany; Currently at Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; University of Potsdam, Potsdam, Germany; Department of Civil, Architectural and Environmental Engineering (ICEA), University of Padova, Padova, Italy
Recommended Citation:
Deal E.,Braun J.,Botter G.. Understanding the Role of Rainfall and Hydrology in Determining Fluvial Erosion Efficiency[J]. Journal of Geophysical Research: Earth Surface,2018-01-01,123(4)