Collaborative Research: The legacy of transience: Understanding dynamic landscape adjustment following mountain uplift in two CZO field areas

合作研究：短暂的遗产：了解两个 CZO 野外区域山体抬升后的动态景观调整

• 批准号: 1349384
• 负责人: Benjamin Crosby
• 金额: $ 16.16万
• 依托单位: Idaho State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-06-01 至 2019-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1349384&HistoricalAwards=false
• 关键词: Collaborative; Research; legacy; transience; Understanding

This project will further geologic understanding of tectonic history and its imprint on the current landscape. Understanding landscape response to tectonics can inform land management decisions and aid in quantifying hazard risk. The project focuses on two specific landscapes from NSF supported Critical Zone Observatories (CZO) and leverages existing data and resources from these two sites. The project combines field work, laboratory analysis, and modeling. Project outcomes will benefit the Earth science research community as well as policy makers. Landlab, the computational model that will be used and further developed in this project, will be made available through the Community Surface Dynamics Modeling System (CSDMS) website. The project will also provide a K-12 training module and Landlab numerical modeling exercises for undergraduate and graduate students. This study explores the unique signature of landscape adjustment following a change in tectonics in two different settings: South Fork Eel River, Northern California, USA and Rio Icacos, in Northeastern Puerto Rico. In both field areas, the current topography indicates that part of the landscape has not yet adjusted to a past or ongoing tectonic disturbance. The overall objective of the project is to understand and quantify the temporal evolution of the entire landscape, focusing specifically on the transformation of the relict topography to adjusted topography in these two field sites. A framework to interpret tectonic history of landscapes based on distribution of relict and adjusted topography will be developed through a combination of field work, cosmogenic nuclide geochronology, and landscape evolution modeling. Field work will include mapping relict parts of the landscape and quantifying morphologic features that vary between the adjusted and relict topography. Field observations will be combined with analyses of digital topographic maps. This work will allow future studies to easily identify relict topography in other landscapes. Geochemical techniques will be used to measure the spatially averaged denudation rate across the two landscapes. Numerical experiments using Landlab will be performed to understand how the tectonic history is expressed in the topography and denudation rate patterns.

该项目将进一步加深对构造历史及其在当前地貌上的印记的地质理解。了解地貌对构造的响应可以为土地管理决策提供信息，并有助于量化灾害风险。该项目侧重于NSF支持的关键区域天文台(CZO)的两个特定景观，并利用这两个站点的现有数据和资源。该项目结合了实地工作、实验室分析和建模。项目成果将使地球科学研究界和政策制定者受益。将在本项目中使用和进一步开发的计算模型LandLab将通过社区表面动力学建模系统(CSDMS)网站提供。该项目还将为本科生和研究生提供K-12培训模块和LandLab数值模拟练习。这项研究探索了在两个不同的背景下，随着构造的变化，景观调整的独特特征：美国加利福尼亚州北部的南福克鳗河和波多黎各东北部的里约热内卢。在这两个地区，目前的地形表明，部分地貌尚未适应过去或正在进行的构造干扰。该项目的总体目标是了解和量化整个地貌的时间演变，特别侧重于将这两个实地地点的残存地貌转变为调整后的地貌。将通过野外工作、宇宙核素年代学和景观演化模拟相结合的方式，建立一个基于遗迹和调整地形分布的景观构造史解释框架。实地工作将包括绘制景观的残留部分，并量化调整后的地形和残留地形之间的不同地貌特征。实地观察将与数字地形图的分析相结合。这项工作将使未来的研究能够很容易地识别其他景观中的残余地形。将使用地球化学技术来测量这两个景观的空间平均剥蚀率。将使用LandLab进行数值实验，以了解构造历史如何在地形和剥蚀率模式中表达。