2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/20/2019 | 9:15 AM - 9:30 AM | RELATIVE CONTROLS ON STREAM TEMPERATURE FROM SHADE, LAND USE, AND WATER MANAGEMENT IN BASINS OF THE PACIFIC NORTHWEST, USA | 151 ABC

RELATIVE CONTROLS ON STREAM TEMPERATURE FROM SHADE, LAND USE, AND WATER MANAGEMENT IN BASINS OF THE PACIFIC NORTHWEST, USA

Stream temperature is controlled by many factors including a landscape’s geology, climate, and human alterations. Our study compares the relative importance of these factors in controlling stream temperature using a statistical modelling framework for three study catchments in the Pacific Northwest, USA. We tested dozens of competing and alternate covariates which include representations of landscape geology, climate, and land use, as well as covariates with potential management implications to see which were significant in predicting observed stream temperatures. To do this, spatial stream network models were fit with these covariate combinations and a modified best subsets analysis selected among different models (using Akaike Information Criterion – AIC – as a model diagnostic statistic) to find a suite of best models. Using this suite of best models, model-averaging methods predicted stream temperatures under a variety of management plan scenarios. These predictions demonstrate how much water temperatures might shift under different restoration scenarios (e.g., channel width restoration, reduced agricultural water use, or riparian shade restoration). The results of this research provide information on the alternate mechanisms potentially controlling stream temperature and could help advise decisions for future temperature management plans.

Landuse
Spatial
Modeling

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Presenters/Authors

Matthew Fuller (), ORISE postdoc with US EPA/Atlantic Ecology Division, matthew.robert.fuller@gmail.com;