气候变化领域集成服务门户(CCPortal): A Channel Network Model for Sediment Dynamics Over Watershed Management Time Scales

CCPortal

DOI	10.1029/2019MS001852
	A Channel Network Model for Sediment Dynamics Over Watershed Management Time Scales
	Beveridge C.; Istanbulluoglu E.; Bandaragoda C.; Pfeiffer A.
发表日期	2020
ISSN	19422466
卷号	12 期号:6
英文摘要	A mountain watershed network model is presented for use in decadal to centurial estimation of source-to-sink sediment dynamics. The model requires limited input parameters and can be effectively applied over spatial scales relevant to management of reservoirs, lakes, streams, and watersheds (1–100 km2). The model operates over a connected stream network of Strahler-ordered segments. The model is driven by streamflow from a physically based hydrology model and hillslope sediment supply from a stochastic mass wasting algorithm. For each daily time step, segment-scale sediment mass balance is computed using bedload and suspended load transport equations. Sediment transport is partitioned between grain size fractions for bedload as gravel and sand, and for suspended load as sand and mud. Bedload and suspended load can deposit and re-entrain at each segment. We demonstrated the model in the Elwha River Basin, upstream of the former Glines Canyon dam, over the dam's historic 84-year lifespan. The model predicted the lifetime reservoir sedimentation volume within the uncertainty range of the measured volume (13.7–18.5 million m3) for 25 of 28 model instances. Gravel, sand, and mud fraction volumes were predicted within measurement uncertainty ranges for 18 model instances. The network model improved the prediction of sediment yields compared to at-a-station sediment transport capacity relations. The network model also provided spatially and temporally distributed information that allowed for inquiry and understanding of the physical system beyond the sediment yields at the outlet. This work advances cross-disciplinary and application-oriented watershed sediment yield modeling approaches. © 2020. The Authors.
英文关键词	bedload transport; suspended load transport; watershed network model
语种	英语
scopus关键词	Gravel; Reservoir management; Rivers; Sediment transport; Sedimentation; Soil conservation; Stochastic models; Stochastic systems; Uncertainty analysis; Water conservation; Water management; Watersheds; Application-oriented; Channel network models; Distributed information; Measurement uncertainty; Reservoir sedimentation; Sediment transport capacity; Transport equation; Watershed management; Suspended sediments; algorithm; bedload; channel hydraulics; grain size; hillslope; hydrological modeling; sediment analysis; sediment transport; sediment yield; sedimentation; source-sink dynamics; streamflow; suspended load; timescale; water management; watershed; Elwha River; United States; Washington [United States]
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156706
作者单位	Department of Civil and Environmental Engineering, University of Washington, Seattle, WA, United States; Department of Geology, Western Washington University, Bellingham, WA, United States
推荐引用方式 GB/T 7714	Beveridge C.,Istanbulluoglu E.,Bandaragoda C.,et al. A Channel Network Model for Sediment Dynamics Over Watershed Management Time Scales[J],2020,12(6).
APA	Beveridge C.,Istanbulluoglu E.,Bandaragoda C.,&Pfeiffer A..(2020).A Channel Network Model for Sediment Dynamics Over Watershed Management Time Scales.Journal of Advances in Modeling Earth Systems,12(6).
MLA	Beveridge C.,et al."A Channel Network Model for Sediment Dynamics Over Watershed Management Time Scales".Journal of Advances in Modeling Earth Systems 12.6(2020).