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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns

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When pools cool streams: A dimensionless framework for reach-scale thermal buffering.

D Tonina¹, A Bertagnoli¹, A Hurst²

¹Center for Ecohydraulics Research, University of Idaho, Boise, ID, USA.

The Science of the Total Environment

|December 23, 2025

Summary

This summary is machine-generated.

River pools are crucial for aquatic habitats. A new framework shows how pool volume and flow hydraulics influence stream temperature buffering, especially during low discharge, aiding restoration efforts.

Keywords:

Gravel-bed rivers Pool-river coupling Pools Residual pool volume River morphology River restoration Streamwater temperature Thermal buffering

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Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow

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Published on: April 30, 2018

Area of Science:

Riverine ecology
Environmental fluid dynamics
Water resource management

Background:

Pools are vital morphologic features in streams, offering essential habitats for aquatic species and protection from harsh conditions.
Stream temperature is a critical factor influencing aquatic ecosystems, with thermal stress posing a significant threat to biodiversity.

Purpose of the Study:

To develop a physically-based dimensionless framework linking pool volume and flow hydraulics to reach-scale thermal buffering of streamwater temperature.
To quantify the thermal buffering capacity of river pools and predict the effectiveness of restoration actions.

Main Methods:

Developed a transient-storage model to simulate pool stratification and thermal buffering.
Introduced two dimensionless quantities: A* (thermal buffering magnitude) and P* (river-pool coupling predictor).
Tested the framework on the Grande Ronde River, comparing pre- and post-restoration conditions.

Main Results:

The framework successfully quantifies thermal buffering and river-pool thermal coupling.
Identified a threshold value (P* ≈ 0.014) below which pools significantly buffer diel temperature fluctuations (up to 80%).
Demonstrated that morphologic storage, stream discharge, and hydraulic mixing jointly control reach-scale temperature variability.

Conclusions:

The developed framework provides a simple and transferable tool for evaluating natural thermal buffering capacity.
The framework can predict and inform the design of restoration actions to create thermal refuges and mitigate heat stress in rivers.
Understanding river-pool coupling is essential for managing thermal regimes in riverine environments.