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

该项目将进一步了解地质构造历史及其对当前景观的影响。了解景观对构造的反应可以为土地管理决策提供信息，并有助于量化灾害风险。该项目聚焦于两个特定的景观，这些景观来自美国国家科学基金会支持的关键区域观测站（CZO），并利用了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决策者受益。将在本项目中使用并进一步发展的计算模型Landlab将通过社区地表动力学建模系统（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。本研究在两个不同的环境中探讨了构造变化后景观调整的独特特征：美国北加州的南福克鳗鱼河和波多黎各东北部的里约热内卢Icacos。在这两个地区，目前的地形表明，部分景观尚未适应过去或正在进行的构造扰动。该项目的总体目标是了解和量化整个景观的时间演变，特别关注这两个场地的遗迹地形向调整地形的转变。通过野外考察、宇宙核素年代学和景观演化模型的结合，建立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余部分，并对调整后的地形和残余地形之间变化的形态特征进行量化。实地观测将与数字地形图分析相结合。这项工作将使未来的研究更容易识别其他景观中的遗迹地形。地球化学技术将用于测量两个景观的空间平均剥蚀率。利用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。

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.