RII Track-4: Improving Understanding of River Flood Dynamics by Relating Flow and Sediment Movement to Shapes of River Dunes in three dimensions

RII Track-4:通过将流量和泥沙运动与三个维度的河流沙丘形状联系起来,增进对河流洪水动力学的理解

基本信息

  • 批准号:
    2032910
  • 负责人:
  • 金额:
    $ 22.41万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2021
  • 资助国家:
    美国
  • 起止时间:
    2021-01-01 至 2023-12-31
  • 项目状态:
    已结题

项目摘要

Much of the world’s population and commerce exist along river corridors. The sustainability of human settlements and the impacts they have on their environments are inextricably tied to river flood and sediment dynamics. Bedforms, migrating mounds of sand such as ripples and dunes, are a primary feature observed on the bottom of dynamic river systems. Their geometries and motions are closely tied to river flow and sediment transport and each one influences the other in complex feedback loops. Direct measurement of all components of these coupled feedbacks is challenging in modern rivers and difficult to interpret in their ancient sedimentary deposits, hindering complete, understanding over long timescales. Over a century of study has attempted to relate bedform shapes, motions, and ancient deposits to the flow and sediment transport conditions that form them. Much of this effort has focused on two-dimensional frameworks. This project establishes a new set of experimental and field techniques in a collaborative setting for collecting coupled measurements of flow, sediment transport, and bedform evolution in three dimensions. In so doing, this work will expand the physical and intellectual capacity of the University of New Orleans to address problems in sediment transport research that extend beyond the scope of this project. This expanded capacity will broaden participation and serve the diverse university community as well as the southeastern region by establishing a highly capable sediment transport facility with state-of-the-art methods at a highly diverse public university in New Orleans. Bedforms are a primary observable feature of sediment transport systems. Their geometries and kinematics (motions) are closely coupled to the dynamics (forces) of flow and sediment transport. As such, bedforms and their stratal elements are key to understanding river conditions, past and present. Flow and sediment transport conditions in sand-bed alluvial systems are tightly coupled to the kinematics of bedforms. Bedforms serve to transport bed material sediment, and their forms extract momentum from the flow in alluvial river systems. Understanding their geometry and behavior can inform models that evaluate bed material flux and shear stress partitioning in modern river systems, as well as enhance interpretation of ancient fluvial strata. This project seeks to build capacity, establish lab protocols, and collect data to address three independent hypotheses: First, that cross-stream, relative to downstream, bedload particle excursion length and velocity increase with increasing turbulent energetics of the flow; second, that increasing probabilities of cross-stream particle collisions enable the establishment of three-dimensionality of bedform topography; and third, that turbulent characteristics of flow, namely shear velocity, can be inverted from three-dimensionality of bedforms and the curvature of cross set bounding surfaces in stratigraphy. A complete assessment of these hypotheses will enhance the ability to forward model bedform geometries and kinematics based on flow and sediment transport conditions. This will bolster inverse models used to quantitatively interpret past sediment transport and flow conditions based on observations of stratigraphy. In collaboration with researchers at the University of California, Santa Barbara, this fellowship will address both regionally and nationally relevant problems of river flood dynamics.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.
世界上大部分人口和商业活动都存在于沿着的河流走廊上。人类住区的可持续性及其对环境的影响与河流洪水和沉积物动力学密不可分。底形,如沙波纹和沙丘的移动土丘,是动态河流系统底部观察到的主要特征。它们的几何形状和运动与河流水流和泥沙输运密切相关,并且在复杂的反馈回路中相互影响。直接测量这些耦合反馈的所有成分在现代河流中具有挑战性,并且难以在其古老的沉积物中解释,阻碍了长时间尺度的完整理解。经过世纪的研究,人们试图将底形、运动和古代沉积物与形成它们的水流和沉积物输运条件联系起来。这方面的努力大多集中在二维框架上。该项目建立了一套新的实验和现场技术,在一个合作的设置,收集耦合测量的流量,泥沙输运和床形演变的三维。在这样做的过程中,这项工作将扩大新奥尔良大学的物理和智力能力,以解决超出本项目范围的泥沙输运研究问题。这种扩大的能力将扩大参与,并通过在新奥尔良一所高度多样化的公立大学建立一个具有最先进方法的高能力沉积物运输设施,为多样化的大学社区和东南部地区服务。底形是沉积物输运系统的主要可观测特征。它们的几何形状和运动学(运动)与水流和泥沙输运的动力学(力)密切相关。因此,底形及其地层要素是了解过去和现在河流状况的关键。冲积砂床系统的水沙运动条件与床形运动密切相关。底形用于输送床料沉积物,其形状从冲积河流系统的水流中获取动量。了解它们的几何形状和行为可以为评估现代河流系统中床物质通量和剪切应力分配的模型提供信息,并增强对古代河流地层的解释。该项目旨在建立能力,建立实验室协议,并收集数据,以解决三个独立的假设:第一,横流,相对于下游,推移质颗粒漂移长度和速度随着湍流能量的增加而增加;第二,横流颗粒碰撞的可能性增加,从而能够建立三维的底形地形;第三,可以从地层学中底形的三维性和交集界面的曲率反演水流的紊流特征,即剪切速度。对这些假设的完整评估将提高根据水流和泥沙输运条件向前模拟底形几何形状和运动学的能力。这将支持用于定量解释过去的沉积物输运和流动条件的基础上观察地层的逆模型。该奖学金将与加州大学圣巴巴拉分校的研究人员合作,解决区域和国家相关的河流洪水动力学问题。该奖项反映了NSF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(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)

数据更新时间:{{ journalArticles.updateTime }}

{{ item.title }}
{{ item.translation_title }}
  • DOI:
    {{ item.doi }}
  • 发表时间:
    {{ item.publish_year }}
  • 期刊:
  • 影响因子:
    {{ item.factor }}
  • 作者:
    {{ item.authors }}
  • 通讯作者:
    {{ item.author }}

数据更新时间:{{ journalArticles.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ monograph.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ sciAawards.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ conferencePapers.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ patent.updateTime }}

Robert Mahon其他文献

An example of the use of professional development groups in support of new ministers
  • DOI:
    10.1007/bf01760421
  • 发表时间:
    1971-03-01
  • 期刊:
  • 影响因子:
    0.700
  • 作者:
    Robert Mahon
  • 通讯作者:
    Robert Mahon

Robert Mahon的其他文献

{{ item.title }}
{{ item.translation_title }}
  • DOI:
    {{ item.doi }}
  • 发表时间:
    {{ item.publish_year }}
  • 期刊:
  • 影响因子:
    {{ item.factor }}
  • 作者:
    {{ item.authors }}
  • 通讯作者:
    {{ item.author }}

相似海外基金

RII Track-4:NSF: Improving subseasonal-to-seasonal forecasts of Central Pacific extreme hydrometeorological events and their impacts in Hawaii
RII Track-4:NSF:改进中太平洋极端水文气象事件的次季节到季节预报及其对夏威夷的影响
  • 批准号:
    2327232
  • 财政年份:
    2024
  • 资助金额:
    $ 22.41万
  • 项目类别:
    Standard Grant
Improving Typhoon Track Forecasts through Physics-Based Bias Correction
通过基于物理的偏差校正改进台风路径预报
  • 批准号:
    23H01665
  • 财政年份:
    2023
  • 资助金额:
    $ 22.41万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
CIVIC-FA Track A: Youth-Centered Civic Technology, Science, and Art for Improving Community Heat Resilience Infrastructure
CIVIC-FA 轨道 A:以青年为中心的公民技术、科学和艺术,用于改善社区耐热基础设施
  • 批准号:
    2322085
  • 财政年份:
    2023
  • 资助金额:
    $ 22.41万
  • 项目类别:
    Standard Grant
SCC-CIVIC-FA Track B: Inclusive Insurance: Improving the Post-Flood Financial Resiliency of Low- and Moderate-Income Households
SCC-CIVIC-FA 轨道 B:普惠保险:提高中低收入家庭的洪水后财务弹性
  • 批准号:
    2318137
  • 财政年份:
    2023
  • 资助金额:
    $ 22.41万
  • 项目类别:
    Standard Grant
SCC-CIVIC-FA Track B: Everyday Respect: Measuring & Improving Communication During Motor Vehicle Stops
SCC-CIVIC-FA 轨道 B:日常尊重:测量
  • 批准号:
    2322026
  • 财政年份:
    2023
  • 资助金额:
    $ 22.41万
  • 项目类别:
    Standard Grant
SCC-CIVIC-PG Track A: Youth-Centered Civic Technology and Citizen Science for Improving Community Heat Resilience Infrastructure
SCC-CIVIC-PG 轨道 A:以青年为中心的公民技术和公民科学,用于改善社区耐热基础设施
  • 批准号:
    2228553
  • 财政年份:
    2022
  • 资助金额:
    $ 22.41万
  • 项目类别:
    Standard Grant
SCC-CIVIC-PG Track B: Everyday Respect: Measuring & Improving Police Officer Communication During Motor Vehicle Stops
SCC-CIVIC-PG 轨道 B:日常尊重:测量
  • 批准号:
    2228785
  • 财政年份:
    2022
  • 资助金额:
    $ 22.41万
  • 项目类别:
    Standard Grant
SCC-CIVIC-PG Track B: Improving Service and Resource Distribution Programs through Public Deliberation
SCC-CIVIC-PG 轨道 B:通过公众审议改进服务和资源分配计划
  • 批准号:
    2228517
  • 财政年份:
    2022
  • 资助金额:
    $ 22.41万
  • 项目类别:
    Standard Grant
SCC-CIVIC-PG Track B: Improving Outcomes for People Directly Impacted by Incarceration Through Civic Studies Education that Includes Meaningful Employment
SCC-CIVIC-PG 轨道 B:通过公民研究教育(包括有意义的就业)改善直接受监禁影响的人们的成果
  • 批准号:
    2228340
  • 财政年份:
    2022
  • 资助金额:
    $ 22.41万
  • 项目类别:
    Standard Grant
CIVIC-PG: Track B: Improving integration of Ukrainian refugees in the US through equitable housing services
CIVIC-PG:B 轨道:通过公平的住房服务改善乌克兰难民在美国的融入
  • 批准号:
    2228447
  • 财政年份:
    2022
  • 资助金额:
    $ 22.41万
  • 项目类别:
    Standard Grant
{{ showInfoDetail.title }}

作者:{{ showInfoDetail.author }}

知道了