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

该奖项全部或部分由2021年美国救援计划法案（公法117-2）资助。河流雕刻山谷，运输营养物质和沉积物，并在山区创造栖息地。在山区特别重要的是基岩河流，其银行和床是坚实的岩石，而不是砾石或沙子。基岩河流可以包含在一个单一的渠道或可以分支成多个渠道称为辫状或封闭。河流是否有一个或多个渠道影响山坡到洪泛平原到河流的连接，这是至关重要的营养转移和栖息地。该项目的目标是了解为什么基岩河流根据气候和构造条件形成一个或多个通道。这项研究将有助于了解基岩河流在哪里有更大的栖息地潜力，并可以为山区河流的保护工作提供信息。该项目将引入高性能计算的一个小型本科院校通过指导研究，并将支持推广到科罗拉多K-5年级学校通过洪水和侵蚀hazardsactivity.This研究测试的气候，岩性和岩石隆起条件，导致单线基岩渠道稳定性，通过开发一个新的数值模型，明确考虑可变的渠道宽度在蜿蜒。数值模型进行校准使用宇宙成因放射性核素和光释光推导出的速度在史密斯河，俄勒冈州，以及全球数据集的基岩通道条件的通道迁移和侵蚀。预期结果将区分适合丰富的栖息地发展和营养/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阶地中编码的过去条件。开发的模型将通过NSF支持的社区表面动力学建模系统（CSDMS）公开共享。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

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.