Collaborative Research: RUI: Climatic and geologic controls on the threshold conditions for bedrock single- and multi-thread channels

合作研究：RUI：基岩单线程和多线程通道阈值条件的气候和地质控制

• 批准号: 2120210
• 负责人: Sarah Schanz
• 金额: $ 19.56万
• 依托单位: Colorado College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-08-01 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2120210&HistoricalAwards=false
• 关键词: Collaborative; Research; RUI; Climatic; geologic

This award is funded in whole or in part under the American Rescue Plan Act of 2021 (Public Law 117-2).Rivers carve valleys, transport nutrients and sediment, and create habitat in mountainous regions. Of particular importance in mountain regions are bedrock rivers, whose banks and bed are solid rock rather than gravel or sand. Bedrock rivers can be contained to a single channel or can branch into multiple channels known as braided or anastomosing. Whether the river has one or multiple channels impacts the hillslope-to-floodplain-to-river connection that is crucial to nutrient transfer and habitat. The goal of this project is to understand why bedrock rivers form one or multiple channels based on the climate and tectonic conditions. The research will help understand where bedrock rivers have greater potential for habitat and can inform conservation efforts in mountain rivers. The project will introduce high performance computing to a small undergraduate college through mentored research and will support outreach to Colorado K-5th grade schools through a flooding and erosion hazards activity.This research tests the climatic, lithologic, and rock uplift conditions that lead to single-thread bedrock channel stability through the development of a new numerical model that explicitly considers variable channel width during meandering. The numerical model is calibrated using cosmogenic radionuclide and optically stimulated luminescence derived rates of channel migration and erosion in the Smith River, Oregon, as well as a global dataset of bedrock channel conditions. Expected results will distinguish the geologic and climatic conditions suitable for rich habitat development and nutrient/sediment connectivity, and help scientists understand the past conditions encoded in bedrock rivers and their terraces. The developed model will be publicly shared through the NSF-supported Community Surface Dynamics Modeling System (CSDMS).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.

该奖项是根据2021年《美国救援计划法》（公共法第117-2）的全部或部分资助的。划分山谷，运输营养和沉积物，并在山区建立栖息地。山区尤其重要的是基岩河，其河岸和床是坚固的岩石，而不是砾石或沙子。基岩河流可以包含在单个通道上，也可以分支到多个通道中，称为编织或吻合。河流是否有一个或多个通道会影响山坡到洪水的河流连接，这对于营养转移和栖息地至关重要。该项目的目的是了解为什么基岩河流基于气候和构造条件形成一个或多个渠道。这项研究将有助于了解基岩河流在栖息地的潜力更大的地方，并可以为山河中的保护工作提供信息。该项目将通过指导的研究将高性能计算引入小型大学大学，并通过洪水和侵蚀危害活动来支持科罗拉多K-5年级学校。这项研究测试了气候，岩性和岩石上升的条件，从而导致单个读书基地底基石渠道稳定性，从而通过开发新的数字模型，以使新的模型逐渐繁殖，以便于繁殖。使用宇宙基因放射性核素和光学刺激的发光得出的通道迁移和侵蚀的发光速率以及俄勒冈州俄勒冈州的通道迁移和侵蚀的速率以及基地通道条件的全球数据集对数值进行校准。预期的结果将区分适合丰富栖息地开发和营养/沉积物连接的地质和气候条件，并帮助科学家了解基岩河流及其梯田中编码的过去条件。开发的模型将通过NSF支持的社区表面动态建模系统（CSDMS）公开共享。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响审查标准，认为值得通过评估值得支持。