2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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5/24/2021 | 2:00 PM - 3:30 PM | THROWING SHADE ON THE HYPORHEIC ZONE: EFFECTS OF FLOODPLAIN SHADE ON HYPORHEIC TEMPERATURES | Virtual Platform

THROWING SHADE ON THE HYPORHEIC ZONE: EFFECTS OF FLOODPLAIN SHADE ON HYPORHEIC TEMPERATURES

In streams with expansive, coarse-grained alluvial aquifers, hyporheic zones are often wide and shallow – a geometry which allows for heat exchange with the atmosphere through overlying floodplain sediments. Therefore, we hypothesized that shade on floodplain sediments leads to less conduction of atmospheric heat to the hyporheic zone, and thus cooler hyporheic water temperatures. Using a groundwater energy flux model, we examined how the presence or absence of floodplain shade interacted with hydraulic conductivity and depth to water table affected hyporheic zone temperatures. Model results showed floodplain shade affected hyporheic zone temperatures; the effects being greater at longer flow paths, lower hydraulic conductivity values, and with thinner overlying floodplain sediments. Thus, in addition to stream-surface shade, floodplain shade may be an important factor in mitigating stream channel temperatures and promoting cold-water habitats in streams where hyporheic zones are shallow and laterally expansive.

Energy flows
Land use
Landscape

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Presenters/Authors

Katie Fogg (), Montana State University, s.katie.fogg@gmail.com;