GSTDTAP  > 气候变化
DOI10.1029/2018GL078696
Numerical Modeling of Plant Root Controls on Gravel Bed River Morphodynamics
Caponi, F.; Siviglia, A.
2018-09-16
发表期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
EISSN1944-8007
出版年2018
卷号45期号:17页码:9013-9023
文章类型Article
语种英语
国家Switzerland
英文摘要

The role of vegetation in shaping the geomorphology of rivers and deltas, along with tidal and estuarine environments, is widely recognized. While mutual interactions between flow, plant canopy, and morphodynamics have been extensively investigated, similar studies considering plant roots are limited. Here we present results from a numerical model that quantify the feedbacks of both the aboveground and belowground vegetation on gravel bed river morphodynamics. Plant root biogeomorphic feedbacks, that is, uprooting and root-enhanced riverbed cohesion, are quantified through the description of the vertical root distribution. By investigating the evolution of the riverbed of a straight gravel channel with a vegetated patch, we show that uprooting is the primary plant root biogeomorphic feedback determining the evolution of the riverbed and the competing influence of the potential flow erosion versus uprooting depth mediates the plant root controls on morphodynamics. These findings broaden our understanding on the role played by plant roots on gravel bed river morphodynamics.


Plain Language Summary Vegetation living at the interface of water and terrestrial areas represents a key element to understand and predict how rivers change their shape. In fact, plants affect but depend on numerous physical processes linked to water flow and transport of sediments in rivers. Research commonly investigates these processes considering only the aboveground part of vegetation, which consists on a system of branches, foliage, and stems interacting with water flow when submerged. However, what assures plant anchorage to the ground helping plant to resist erosion and strengthens sediments increasing their cohesion is the belowground vegetation, the roots, which is often disregarded. In this study, we include a description of plant roots, by their vertical distribution, into a model simulating river morphodynamics to investigate their role. By means of numerical experiments in a simple river channel configuration, we show that vegetation removal by erosion is the most important process controlling riverbed evolution and that conditions under which plant roots mostly influence such evolution depend on the balance between erosion and root resistance. This can help to broaden our view on the topic and to address questions yet unexplored.


英文关键词plant roots biogeomorphic feedbacks uprooting river morphology numerical modeling vegetation patch
领域气候变化
收录类别SCI-E
WOS记录号WOS:000445727500035
WOS关键词VEGETATION DYNAMICS ; SEDIMENT TRANSPORT ; FLUVIAL LANDFORMS ; FLOW ; FLUCTUATIONS ; ADJUSTMENTS ; LANDSCAPE ; EVOLUTION ; CHANNELS ; DENSITY
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/28619
专题气候变化
作者单位Swiss Fed Inst Technol, Lab Hydraul Hydrol & Glaciol, Zurich, Switzerland
推荐引用方式
GB/T 7714
Caponi, F.,Siviglia, A.. Numerical Modeling of Plant Root Controls on Gravel Bed River Morphodynamics[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(17):9013-9023.
APA Caponi, F.,&Siviglia, A..(2018).Numerical Modeling of Plant Root Controls on Gravel Bed River Morphodynamics.GEOPHYSICAL RESEARCH LETTERS,45(17),9013-9023.
MLA Caponi, F.,et al."Numerical Modeling of Plant Root Controls on Gravel Bed River Morphodynamics".GEOPHYSICAL RESEARCH LETTERS 45.17(2018):9013-9023.
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