Collaborative Research: Emergent Hydrological Properties Associated with Multiple Channel-Spanning Logjams
合作研究:与多航道堵塞相关的新兴水文特性
基本信息
- 批准号:1819086
- 负责人:
- 金额:$ 23.19万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2018
- 资助国家:美国
- 起止时间:2018-06-01 至 2022-05-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In this proposal we look to quantify relationships among river shapes, logjams, and the movement of water around jams and through surrounding sediments. In doing so, we will advance understanding of (i) how logjams affect water quality and stream communities in forested watersheds, (ii) the effects of historical and continuing human alteration of river corridors in forested regions, and (iii) how to design artificial logjams in rivers to manage stream temperature, nutrients, and aquatic communities. Our work will be shared with resource managers and practitioners to help with issues associated with river management and restoration. Student participation will include (i) K-12 students via course materials that will be developed in collaboration with elementary school teachers; (ii) undergraduate students involved in field data collection and analysis, including students from diverse backgrounds; and (iii) graduate students responsible for the primary data analysis and interpretation, who will have the opportunity to work with and mentor the undergraduate researchers.The benefits of large wood (LW) in river corridors are numerous, including the potential to enhance hyporheic exchange flow (HEF). Existing work has focused on HEF near single logs or single logjams. However, natural channels in forested regions with minimal human alteration commonly contain abundant dispersed LW pieces and multiple logjams spaced irregularly along the channel. We have little indication of whether multiple channel-spanning logjams produce an additive or nonlinear effect on HEF, but these alternatives have important implications for understanding river ecosystem function and for river management and restoration. Our primary objective is to quantify how HEF changes with increasing channel heterogeneity associated with channel-spanning logjams. We will use field measurements, physical experiments, and numerical models to evaluate the characteristics of HEF associated with different spatial densities of channel-spanning logjams. We expect nonlinear relations between logjams and HEF to result from increased bedforms such as pools that maximize flux rates, increased head gradients associated with decreased downstream spacing between logjam-induced backwaters, and thicker deposits of sand and gravel, which act together to create steep hydraulic head gradients within thick, permeable bed sequences. We also expect a nonlinear relation between logjams and HEF at the transition to anabranching as a result of the enhanced HEF between divided channels. Implications of this work will be with respect to engineered logjams, which are currently being added to rivers, but with no systematic understanding of how the effects of LW addition scale with river size, the volume and spatial distribution of wood addition, or the characteristics of the wood and the channel, constraining our ability to design LW-based river restoration to achieve a desired level of HEF. As part of our research, we will develop curriculum for a local K-12 school.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
在这个方案中,我们希望量化河流形状、堵塞以及堵塞周围和周围沉积物的水运动之间的关系。在此过程中,我们将进一步了解(i)阻塞如何影响森林流域的水质和溪流群落,(ii)森林地区河流走廊的历史和持续人类改变的影响,以及(iii)如何在河流中设计人工阻塞来管理溪流温度、营养物质和水生群落。我们的工作将与资源管理者和从业者分享,以帮助解决与河流管理和恢复有关的问题。学生的参与将包括(i) K-12学生,他们将通过与小学教师合作开发的课程材料;(ii)参与实地数据收集和分析的本科生,包括来自不同背景的学生;负责初级数据分析和解释的研究生,他们将有机会与本科生研究人员一起工作并指导他们。在河流廊道中使用大型木材(LW)的好处很多,包括增强潜流交换流量(HEF)的潜力。现有的工作主要集中在单个原木或单个阻塞附近的HEF。然而,在人为影响最小的森林地区,自然河道通常含有大量分散的LW块和沿河道不规则分布的多个堵塞。我们几乎没有迹象表明多通道阻塞是否会对HEF产生附加或非线性影响,但这些替代方案对理解河流生态系统功能以及河流管理和恢复具有重要意义。我们的主要目标是量化HEF如何随着与通道跨越阻塞相关的通道异质性的增加而变化。我们将使用现场测量,物理实验和数值模型来评估与不同空间密度的通道跨越阻塞相关的HEF特征。我们预计,淤塞和HEF之间的非线性关系将产生于河床形态的增加,例如使通量率最大化的水池、淤塞引起的回水之间的下游间距减小而导致的水头梯度增加,以及更厚的砂和砾石沉积物,这些因素共同作用,在厚的渗透性层序中形成陡峭的水头梯度。我们还预计,由于分割通道之间的HEF增强,在向分支过渡时,阻塞和HEF之间存在非线性关系。这项工作的意义在于,目前正在向河流中添加工程堵塞,但没有系统地了解LW添加的影响如何随河流大小、木材添加的体积和空间分布或木材和通道的特征而变化,这限制了我们设计基于LW的河流恢复以达到所需的HEF水平的能力。作为我们研究的一部分,我们将为当地一所K-12学校开发课程。该奖项反映了美国国家科学基金会的法定使命,并通过使用基金会的知识价值和更广泛的影响审查标准进行评估,被认为值得支持。
项目成果
期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Laboratory Flume and Numerical Modeling Experiments Show Log Jams and Branching Channels Increase Hyporheic Exchange
- DOI:10.1029/2021wr030299
- 发表时间:2021-09
- 期刊:
- 影响因子:5.4
- 作者:K. Wilhelmsen;A. Sawyer;A. Marshall;S. Mcfadden;K. Singha;E. Wohl
- 通讯作者:K. Wilhelmsen;A. Sawyer;A. Marshall;S. Mcfadden;K. Singha;E. Wohl
Mapping increases in hyporheic exchange from channel-spanning logjams
- DOI:10.1016/j.jhydrol.2020.124931
- 发表时间:2020-08-01
- 期刊:
- 影响因子:6.4
- 作者:Doughty, M.;Sawyer, A. H.;Singha, K.
- 通讯作者:Singha, K.
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Audrey Sawyer其他文献
Combining seepage meters and amphibious electric resistivity tomography to investigate pathways of submarine groundwater discharge
结合渗流计和两栖电阻率层析成像技术研究海底地下水排放路径
- DOI:
10.1016/j.scitotenv.2025.178831 - 发表时间:
2025-03-10 - 期刊:
- 影响因子:8.000
- 作者:
Marc Diego-Feliu;Maria Munoz-Pinyol;Jose Tur-Piedra;Michela Trabucchi;Aaron Alorda-Kleinglass;Raquel González-Fernández;Núria Ferrer;Bella Almillategui;Audrey Sawyer;Carlos René Green-Ruiz;Juanjo Ledo;Valentí Rodellas;Albert Folch - 通讯作者:
Albert Folch
Audrey Sawyer的其他文献
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{{ truncateString('Audrey Sawyer', 18)}}的其他基金
CAREER: Dynamic water table controls on reactive solute transport near the groundwater-surface water interface
职业:动态地下水位控制地下水-地表水界面附近的反应性溶质输送
- 批准号:
1752995 - 财政年份:2018
- 资助金额:
$ 23.19万 - 项目类别:
Continuing Grant
Collaborative Research: Surface water-groundwater connectivity in the tidal freshwater zone and the fate of nitrogen in tidal rivers
合作研究:潮汐淡水区地表水-地下水连通性和潮汐河中氮的归宿
- 批准号:
1446724 - 财政年份:2015
- 资助金额:
$ 23.19万 - 项目类别:
Standard Grant
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- 批准号:10774081
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