2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

5/20/2019 | 9:30 AM - 9:45 AM | IS SHADING FLOODPLAIN SEDIMENTS IMPORTANT FOR STREAM CHANNEL TEMPERATURES? | 151 ABC

IS SHADING FLOODPLAIN SEDIMENTS IMPORTANT FOR STREAM CHANNEL TEMPERATURES?

In 2011, Meacham Creek (Umatilla Basin, Oregon, USA) underwent a restoration effort reconnecting the stream channel to its historic floodplain – with the intent of increasing hyporheic exchange to cool summertime stream temperatures. In response to the restoration, floodplain well data showed an immediate increase in water level in the associated alluvial aquifer. Additionally, post-restoration simulation modeling showed hyporheic exchange rate and heat transfer to the aquifer increased. Paradoxically, summertime stream temperatures were warmer in the years that followed the restoration. During the restoration, much of the floodplain vegetation was removed for heavy equipment access. We hypothesized that associated loss of shade in the stream corridor warmed channel temperatures directly via increased solar radiation on the stream surface, and also indirectly via increased heat conduction into the hyporheic zone through exposed floodplain sediments. We examined the potential effects of reduced floodplain shade on channel and hyporheic temperature using a stream and aquifer heat budget model, with and without floodplain shade. Where hyporheic zones extend laterally from the channel, management of floodplain shade, in addition to streamside shade, may have important implications for channel water temperature dynamics.

Temperature
Hyporheic
Restoration

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Presenters/Authors

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