The influence of hierarchical and multiscale river morphology and sediment heterogeneity on hyporheic exchange processes

分级多尺度河流形态和沉积物非均质性对潜流交换过程的影响

• 批准号: 2048452
• 负责人: Reza Soltanian
• 金额: $ 52.09万
• 依托单位: University of Cincinnati Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2048452&HistoricalAwards=false
• 关键词: influence; hierarchical; multiscale; river; morphology; influence; hierarchical; multiscale; river; morphology

Solutes, heat, and other dissolved constituents interact along rivers as river water and groundwater mix, often referred to as hyporheic exchange. Processes within the hyporheic zone have the potential to mitigate contaminant loads in rivers and improve water quality. These processes depend on the shape of the channel and the distribution of sediment types and thus vary across space and time. This project will combine innovative field measurements with advanced computer models to provide insights into the influence of sediment heterogeneity and river channel morphology on solute fluxes and nutrient cycling. Results of this research will have practical applications in water resource management, and will guide strategies to optimize both surface water and groundwater quality. The project will use the Theis Environmental Monitoring and Modeling Site at the University of Cincinnati. Hands-on activities at the site will stimulate student interest, and prepare them for water-related STEM careers. A diverse group of K-12 students will receive hands-on experience through a water program developed in partnership with the Cincinnati Museum Center.The project goal is to provide insights into how multiscale sediment heterogeneity and river channel morphology control hyporheic exchange processes, and to improve the capacity of numerical models to predict spatial patterns of hyporheic flux, solute residence times, and resulting biogeochemical transformations. The project will utilize innovative field observations to develop and validate multiscale numerical models. The project will address several primary goals: (1) quantify the controlling influence of multiscale fluvial forms and associated stratal architecture on hyporheic flux and solute residence times, and determine the relevance of scales; (2) determine how multiscale fluvial forms and stratal architecture influence biogeochemical reaction dynamics within the hyporheic zone; and (3) identify which heterogeneity and morphologic attributes are most essential for understanding and accurately predicting hyporheic exchange processes.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.

溶质，热和其他溶解的成分沿河流和地下水混合物相互作用，通常称为低音交换。低音区域内的过程有可能减轻河流中的污染物负载并改善水质。这些过程取决于通道的形状和沉积物类型的分布，因此在空间和时间之间有所不同。该项目将将创新的现场测量与先进的计算机模型相结合，以洞悉沉积物异质性和河道通道形态对溶质通量和营养循环的影响。这项研究的结果将在水资源管理中有实际应用，并将指导策略以优化地表水和地下水质量。该项目将在辛辛那提大学使用Theis环境监测和建模地点。现场的动手活动将激发学生的兴趣，并为与水有关的STEM职业做好准备。 A diverse group of K-12 students will receive hands-on experience through a water program developed in partnership with the Cincinnati Museum Center.The project goal is to provide insights into how multiscale sediment heterogeneity and river channel morphology control hyporheic exchange processes, and to improve the capacity of numerical models to predict spatial patterns of hyporheic flux, solute residence times, and resulting biogeochemical transformations.该项目将利用创新的现场观察来开发和验证多尺寸数值模型。该项目将解决几个主要目标：（1）量化多尺度河流形式的控制影响以及相关的层架构对低音通量和溶质停留时间的影响，并确定尺度的相关性； （2）确定多尺度的河流形式和层构建如何影响低血体区域内的生物地球化学反应动力学； （3）确定哪些异质性和形态学属性对于理解和准确预测低音交换过程最重要。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的智力优点评估来获得支持的，并具有更广泛的影响。