2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/20/2019 | 9:15 AM - 9:30 AM | HOW TO THINK ABOUT HYPORHEIC EXCHANGE IN GRAVEL BEDDED RIVERS (WITH ATTENTION TO IMPLICATIONS FOR BIOGEOCHEMISTRY) | 250 AB
HOW TO THINK ABOUT HYPORHEIC EXCHANGE IN GRAVEL BEDDED RIVERS (WITH ATTENTION TO IMPLICATIONS FOR BIOGEOCHEMISTRY)
Hyporheic exchange – the continuous, bi-directional exchange of water between a stream channel and underlying alluvium – is now recognized as a critical driver of stream ecosystems. When conceptualizing hyporheic exchange in expansive hyporheic zones (HZs) associated with coarse-grained river beds, researchers and managers sometimes default to an assumption of homogeneity, failing to consider the temporally dynamic and heterogeneous nature of upwelling hyporheic water with respect to temperature, dissolved constituents, and other characteristics. Further, when the HZ is conceptualized as single, homogenous transient storage zone, the diversity of water characteristics and habitats within the HZ is overlooked. A conceptual model of hyporheic exchange that incorporates the hydrologic age distribution of water stored in the HZ and the residence time distribution of water discharged from the HZ underscores the spatially diverse and temporally dynamic characteristics of upwelling hyporheic water. We present such a conceptual model, focusing on variation in ratios of water exchange rates and storage as a function of residence time and water age. Incorporating such hydrologic rigor when considering hyporheic exchange aids in the design, implementation, and interpretation of research related to hyporheic processes.
- Modeling
- Hydrology
- Floodplain
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Presenters/Authors
Geoffrey Poole
(), Montana State University, Montana Institute on Ecosystems, gpoole@montana.edu ;
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Scott O'Daniel
(), Umatilla Tribes, scottodaniel@ctuir.org;
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Katie Fogg
(), Montana State University, s.katie.fogg@gmail.com;
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Byron Amerson
(), Montana State University, byron.amerson@gmail.com;
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Ann Marie Reinhold
(), Montana State University, Montana Institute on Ecosystems, reinhold@montana.edu;
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Sam Carlson
(), Montana State University, sam.p.carlson@gmail.com;
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