2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/22/2018 | 2:45 PM - 3:00 PM | RADIATION INCIDENCE IS NO COINCIDENCE: MODELING TERRESTRIAL CONTROL ON RIVER LIGHT ENVIRONMENTS | 320

RADIATION INCIDENCE IS NO COINCIDENCE: MODELING TERRESTRIAL CONTROL ON RIVER LIGHT ENVIRONMENTS

Light availability is an important driver of seasonal variations in gross primary productivity (GPP) in rivers, yet there are only a handful of datasets with high frequency measurements of both GPP and light for rivers. Light regimes of rivers are often uncorrelated to patterns of incoming light due to attenuation both from the surrounding terrestrial landscape and in-stream changes in water clarity. Here, we focus on how the terrestrial landscape influences patterns in the light reaching the river surface. We developed a model to predict the seasonality of light incident at the river surface as a function of riparian phenology, channel geometry, and landscape topography. The model was tested by comparing predicted values to near-continuous in situ measurements at multiple sites with varying characteristics. Additionally, we used the model to experimentally test the relative importance of and interaction between individual controls on light availability. Accurate predictions of river light regimes permits assessing the role of light in mediating seasonal patterns of GPP at sites without existing light records. Additionally, the ability to generate predictions over large spatial scales facilitates examining patterns of GPP from a network perspective.

Modeling
Aquatic-terrestrial Linkage
Near-stream Zone

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Presenters/Authors

Philip Savoy (), Duke University, philip.savoy@gmail.com;