Predicting threatened bull trout occurrence using Ripple, a digital terrain-based modeling program

Jan 06, 2026

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This study focuses on predicting the occurrence of threatened bull trout (Salvelinus confluentus) in the Pacific Northwest using Ripple, a digital terrain-based modeling program. Bull trout exhibit diverse life forms, including resident, migratory, and anadromous types, all of which require cold, clean, complex, and connected habitats. The migratory behavior of bull trout remains poorly understood, leading to challenges in monitoring their populations and habitats. Our approach aims to improve habitat and population predictions for any river network and will identify future improvements, including better channel slope estimations.

1 bull trout 2 habitat monitoring 3 ripple modeling 4 pacific northwest 5 threatened species 6 population prediction 7 migratory behavior 8 cold water habitat text

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Predicting threatened bull trout occurrence using Ripple, a digital terrain-based modeling program

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Predicting threatened bull trout occurrence using Ripple, a digital terrain-based modeling program Audrey Sawyer
Bull Trout (Salvelinus confluentus) • Threatened species • Pacific Northwest region • Resident, migratory, and anadromous forms • Habitat needs: • Cold • Clean • Complex • Connected
Problem Definition The migratory behavior of bull trout is poorly understood. How can we best monitor the habitat and population of this threatened species?
Approach Predict habitat and population for any river network using Ripple.

Future Work • Try better method for estimating channel slope • Fine-tune model parameters to represent bull trout instead of coho salmon (grain size for spawning, ocean survival rate, habitat preference)