气候变化领域集成服务门户(CCPortal): Momentum and Energy Predict the Backwater Rise Generated by a Large Wood Jam

CCPortal

DOI	10.1029/2020GL089346
	Momentum and Energy Predict the Backwater Rise Generated by a Large Wood Jam
	Follett E.; Schalko I.; Nepf H.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:17
英文摘要	Wood reintroduction is now considered an important aspect of stream restoration, due to ecohydraulic benefits associated with wood presence. Channel-spanning wood jams create an upstream backwater, increasing flow heterogeneity, sediment deposition, and ecological productivity, but also flood risk. Backwater rise prediction is necessary to evaluate flood hazards in hydraulic models, improve design of engineered logjam projects, and compare jam effects across river systems. We present experimental results demonstrating that a jam can be modeled as a porous obstruction generating momentum loss proportional to the number, size, and packing density of the logs and the jam length. Energy and momentumconstraints are combined to predict backwater rise from unit discharge and a dimensionless structural parameter. This novel approach allows description of preexisting jams with a common metric. The model was used to demonstrate how backwater length, pool size, and upstream sediment deposition depend on jam structure and channel slope. ©2020. The Authors.
英文关键词	Deposition; Forecasting; Hydraulic models; Water; Wood; Ecological productivity; Flow heterogeneity; Packing density; Sediment deposition; Stream restoration; Structural parameter; Unit discharge; Wood reintroduction; Floods; backwater; channel; discharge; flood; flow modeling; momentum; prediction; river system
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169831
作者单位	School of Engineering, Cardiff University, Cardiff, United Kingdom; Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States
推荐引用方式 GB/T 7714	Follett E.,Schalko I.,Nepf H.. Momentum and Energy Predict the Backwater Rise Generated by a Large Wood Jam[J],2020,47(17).
APA	Follett E.,Schalko I.,&Nepf H..(2020).Momentum and Energy Predict the Backwater Rise Generated by a Large Wood Jam.Geophysical Research Letters,47(17).
MLA	Follett E.,et al."Momentum and Energy Predict the Backwater Rise Generated by a Large Wood Jam".Geophysical Research Letters 47.17(2020).