Collaborative Research: From rock to regolith to rivers: weathering, grain size, and controls on soil production and fluvial incision

合作研究：从岩石到风化层再到河流：风化、粒度以及对土壤生产和河流切割的控制

• 批准号: 2104111
• 负责人: Jane Willenbring
• 金额: $ 23.39万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-10-21 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2104111&HistoricalAwards=false
• 关键词: Collaborative; Research; rock; regolith; rivers

Soil is a vital resource but processes controlling soil production are not well understood. Data collected in previously NSF-funded studies, along with new data, will be used to better understand how soil is produced in different environments. The depth of soil is likely closely linked to the soil production rate and how rivers erode. How rivers and soils interact has practical consequences for river infrastructure and human impacts on landscapes such as deforestation or forest fires. How sustainable is soil given a changing Earth? Undergraduate and graduate students and a post-doctoral scholar will contribute to this research project. The team will also use 3D printers to make synthetic landscapes to be used as part of outreach to K-12 students who are visually impaired or have Autism Spectrum Disorder.In the Rio Blanco watershed in the Luquillo Critical Zone Observatory, we will map patterns in surface soil thickness, grain size, and soil chemistry across the landscape and tie these to new rates of soil production and soil grain residence time. Theoretical hillslope-channel coupling will be modeled using the Landlab modeling toolkit and a recently published analytical model that predicts the grain size distribution of sediment fed to channels as a function of climate and erosion rate, which controls the residence time of soil particles. We will also build a new fluvial incision modeling component to incorporate the influence of sediment load, including grain size, on bedrock incision rates. Further, data from the Rio Blanco will be used to calibrate a Landlab model.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.

土壤是一种重要资源，但控制土壤生产的过程尚不清楚。之前由国家科学基金会资助的研究中收集的数据以及新数据将用于更好地了解土壤在不同环境中是如何产生的。土壤深度可能与土壤生产率和河流侵蚀方式密切相关。河流和土壤的相互作用对河流基础设施以及人类对森林砍伐或森林火灾等景观的影响产生实际影响。考虑到不断变化的地球，土壤的可持续性如何？本科生、研究生以及博士后学者将为该研究项目做出贡献。该团队还将使用 3D 打印机制作合成景观，作为向视力障碍或患有自闭症谱系障碍的 K-12 学生宣传的一部分。在卢基洛关键区天文台的 Rio Blanco 流域，我们将绘制整个景观中表层土壤厚度、颗粒大小和土壤化学的模式，并将这些模式与新的土壤生产率和土壤颗粒停留时间联系起来。理论山坡-河道耦合将使用 Landlab 建模工具包和最近发布的分析模型进行建模，该模型预测流入河道的沉积物的粒度分布作为气候和侵蚀率的函数，从而控制土壤颗粒的停留时间。我们还将构建一个新的河流切割建模组件，以纳入沉积物负荷（包括颗粒尺寸）对基岩切割率的影响。此外，来自 Rio Blanco 的数据将用于校准 Landlab 模型。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力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

Quantifying Rates of Landscape Unzipping

量化景观解压缩率

• DOI: 10.1029/2021jf006236
• 发表时间: 2022
• 期刊: Journal of Geophysical Research: Earth Surface
• 作者: Harrison, Emma J.;McElroy, Brandon;Willenbring, Jane K.
• 通讯作者: Willenbring, Jane K.

Late Holocene Cliff Retreat in Del Mar, CA, Revealed From Shore Platform 10 Be Concentrations and Numerical Modeling

海岸平台 10 Be 浓度和数值模拟揭示了加利福尼亚州德尔马的全新世晚期悬崖撤退

• DOI: 10.1029/2022jf006855
• 发表时间: 2023
• 期刊: Journal of Geophysical Research: Earth Surface
• 作者: Clow, T.;Willenbring, J. K.;Young, A. P.;Matsumoto, H.;Hidy, A. J.;Shadrick, J. R.
• 通讯作者: Shadrick, J. R.

Seepage Erosion in the Luquillo Mountains, Puerto Rico, Relict Landscapes

• DOI: 10.1029/2019jf005341
• 发表时间: 2020-06-01
• 期刊: JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
• 影响因子: 3.9
• 作者: Harrison, E. J.;Brocard, G. Y.;Willenbring, J. K.
• 通讯作者: Willenbring, J. K.