What are the seasonal controls on stream-riparian groundwater exchange during baseflow recession in headwater catchments?

源头流域基流衰退期间河流-河岸地下水交换的季节性控制是什么？

• 批准号: 0911435
• 负责人: Michael Gooseff
• 金额: $ 46.07万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-07-01 至 2013-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0911435&HistoricalAwards=false
• 关键词: What; seasonal; controls; stream; riparian

ABSTRACT"This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)."Hyporheic zones and riparian zones play important roles in catchment-scale budgets of nutrients, heat, and energy. Significant research has been conducted on the biogeochemical and hydrologic functions of both hyporheic and riparian zones, though often in isolation from each other. Here, we seek to determine how dynamic valley-bottom hydrology is controlled by valley morphology and gradient, and how this in turn influences hyporheic exchange throughout summer baseflow recession in headwater catchments. We pose the following research questions:1) How do down-valley and cross-valley vectors of subsurface flow change through seasonal baseflow recession?2) How are these changes controlled by valley-scale morphology and gradient?3) How spatially consistent are the patterns of down- and cross-valley vectors? 4) How does the extent of hyporheic exchange change during seasonal baseflow recession? We will address these questions by combining field methods, groundwater flow and transport modeling, stream solute transport modeling, and integrated analyses of tracer data and geophysical surveys of stream tracer distribution in the subsurface. This research will significantly enhance our ability to predict and quantify the hydrology of stream-groundwater exchange. We propose to conduct a workshop at the Shale Hills Critical Zone Observatory to bring together hydrologists and geophysicists to define the cutting edge and future directions of hydrogeophysics in stream-groundwater interactions. We will additionally train two graduate students and two undergraduate students in hydrology, groundwater modeling, geophysics, and solute transport. We will actively recruit from under-represented applicants to Penn State.

摘要“该奖项是根据 2009 年美国复苏和再投资法案（公法 111-5）提供资金的。”地下区域和河岸区域在流域规模的养分、热量和能源预算中发挥着重要作用。人们对潜流带和河岸带的生物地球化学和水文功能进行了大量研究，尽管它们常常是相互隔离的。在这里，我们试图确定山谷形态和梯度如何控制动态谷底水文，以及这反过来如何影响源头集水区整个夏季基流衰退期间的潜流交换。我们提出以下研究问题：1）地下水流的下谷和跨谷矢量如何通过季节性基流衰退而变化？2）这些变化是如何受山谷尺度形态和梯度控制的？3）下谷和跨谷向量的模式？ 4) 季节性基流衰退期间，潜流交换的程度如何变化？我们将通过结合现场方法、地下水流和传输模型、河流溶质传输模型以及示踪剂数据的综合分析和地下河流示踪剂分布的地球物理调查来解决这些问题。这项研究将显着增强我们预测和量化溪流-地下水交换水文学的能力。我们建议在页岩山关键区观测站举办一次研讨会，将水文学家和地球物理学家聚集在一起，确定河流与地下水相互作用中水文地球物理学的前沿和未来方向。我们还将额外培训水文学、地下水模拟、地球物理学和溶质运移领域的两名研究生和两名本科生。我们将积极招募宾夕法尼亚州立大学代表性不足的申请者。