EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021

(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)

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5/26/2021 | 8:30 AM - 10:30 AM | HIGH-RESOLUTION THERMAL AND FLUVIAL LONGITUDINAL PROFILING INFORMS RIVER RESTORATION FOR SALMONIDS | Virtual Platform

HIGH-RESOLUTION THERMAL AND FLUVIAL LONGITUDINAL PROFILING INFORMS RIVER RESTORATION FOR SALMONIDS

Restoring rivers for salmonids requires initial assessment of the thermal and geomorphic riverscape to identify stressors and determine features that can be enhanced. We floated 70 km of the lower Priest River in northern Idaho (USA) to produce longitudinal profiles of (1) water temperature, (2) water velocity and depth with acoustic doppler current profiling (ADCP), and (3) riparian canopy height and density, and channel incision from lidar (light detection and ranging) data. We complemented these spatially continuous data with in-situ thermographs placed in the mainstem and at selected pools and tributary junctions. We hypothesized that incised areas with limited riparian cover would warm rapidly in a downstream direction. Preliminary results revealed complex thermal patterns. Water temperature decreased in a downstream direction due to groundwater and surface water exchange and tributary inflows. We also observed localized downstream warming in low-velocity reaches where travel time was greater and net solar radiation was relatively high. In contrast, high-velocity reaches showed slower warming in a downstream direction. These findings highlight the importance of high-resolution, spatially extensive assessments of the fluvial landscape to help prioritize the selection of sites for restoration.

Stream restoration
Management
Climate change

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Presenters/Authors

Francine Mejia (), U.S. Geological Survey, Forest and Rangeland Ecosystem Science Center, Cascadia Field Station, fmejia@usgs.gov;