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Related Experiment Video

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Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds

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Published on: September 26, 2017

Nocturnal river water temperatures: Spatial and temporal variations.

R L Wilby¹, M F Johnson¹, J A Toone²

¹Department of Geography, Loughborough University, Leicestershire LE11 3TU, UK.

The Science of the Total Environment

|March 20, 2014

Summary

Night-time water temperature (nTw) significantly impacts aquatic ecosystems but is poorly understood. This study reveals nTw is influenced by daylight air temperature, groundwater, and weather, requiring a catchment-wide management approach.

Keywords:

Hysteresis curve Logistic regression Riparian shade River management Thermal wave Water temperature

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Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface

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Published on: June 8, 2015

Area of Science:

Environmental Science
River Ecology
Hydrology

Background:

Nocturnal water temperature (nTw) is crucial for aquatic life and river metabolism.
Limited understanding of nTw due to insufficient high-frequency data and aggregation methods.

Purpose of the Study:

To investigate the drivers of nTw using high-frequency data.
To improve the understanding and prediction of nTw dynamics.

Main Methods:

Analysis of 15-minute water and air temperature data from 36 river sites.
Application of hysteresis, auto-correlation, and logistic regression techniques.
Stratification of data into day and night periods.

Main Results:

Daily hysteresis loops revealed lagged responses of nTw to daylight air temperature, groundwater, and discharge.
Logistic regression models explained 80-94% of daily maximum nTw variance, with lower skill for minimum nTw.
Downstream variations indicated influences of groundwater, riparian shade, and weather.

Conclusions:

nTw dynamics are complex, influenced by multiple catchment-wide factors.
Effective water temperature management requires a holistic approach considering weather variability, extreme events, groundwater, and channel structures.
Riparian shade benefits must be assessed within a broader catchment context.