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: 1651242
• 负责人: Jane Willenbring
• 金额: $ 8.65万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-06-30 至 2018-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1651242&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.

该项目将进一步了解构造历史及其对当前景观的烙印。 了解景观对构造学的反应可以为土地管理决策提供信息，并有助于量化危害风险。 该项目着重于NSF支持的关键区观测站（CZO）的两个特定景观，并利用这两个站点的现有数据和资源。 该项目结合了现场工作，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。 Landlab是该项目中将使用并进一步开发的计算模型，将通过社区表面动态建模系统（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数值建模练习。 这项研究探讨了在两种不同的环境中发生构造的变化之后，景观调整的独特签名：南叉鳗鱼，美国北加州，美国和波多黎各东北部的里约伊卡科斯。 在两个现场区域，当前的地形表明，部分景观尚未适应过去或正在进行的构造干扰。 该项目的总体目的是了解和量化整个景观的时间演变，专门针对将遗物地形转换为在这两个田间地点中调整后的地形的转换。 通过野外工作，宇宙核素年代学和景观演化建模的结合，将开发一个基于遗物和调整地形的景观构造历史的框架。 现场工作将包括绘制景观的遗物部分以及量化调整后和遗物地形之间变化的形态特征。 现场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可以轻松地识别其他景观中的遗物地形。 地球化学技术将用于测量两个景观中的空间平均剥离率。将进行使用Landlab的数值实验，以了解在地形和剥离率模式中如何表达构造历史。