Assessing the potential of drone-based thermal infrared imagery for quantifying river temperature heterogeneity

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

External organisations

  • University of Nottingham

Abstract

Climate change is altering river temperature regimes, modifying the dynamics of temperature-sensitive fishes. The ability to map river temperature is therefore important for understanding the impacts of future warming. Thermal infrared (TIR) remote sensing has proven effective for river temperature mapping, but TIR surveys of rivers remain expensive. Recent drone-based TIR systems present a potential solution to this problem. However, information regarding the utility of these miniaturised systems for surveying rivers is limited. Here, we present the results of several drone-based TIR surveys conducted with a view to understanding their suitability for characterising river temperature heterogeneity. We find that drone-based TIR data are able to clearly reveal the location and extent of discrete thermal inputs to rivers, but thermal imagery suffers from temperature drift-induced bias, which prevents the extraction of accurate temperature data. Statistical analysis of the causes of this drift reveals that drone flight characteristics and environmental conditions at the time of acquisition explain ~66% of the variance in TIR sensor drift. These results shed important light on the factors influencing drone-based TIR data quality and suggest that further technological development is required to enable the extraction of robust river temperature data. Nonetheless, this technology represents a promising approach for augmenting in situ sensor capabilities and improved quantification of advective inputs to rivers at intermediate spatial scales between point measurements and “conventional” airborne or satellite remote sensing.

Bibliographic note

Dugdale SJ, Kelleher CA, Malcolm IA, Caldwell S, Hannah DM. Assessing the potential of drone‐based thermal infrared imagery for quantifying river temperature heterogeneity. Hydrological Processes. 2019;1–12. https://doi.org/10.1002/hyp.13395

Details

Original languageEnglish
JournalHydrological Processes
Early online date18 Jan 2019
Publication statusE-pub ahead of print - 18 Jan 2019

Keywords

  • climate change, drones, remote sensing, river temperature, temperature heterogeneity, thermal infrared, TIR, unoccupied aerial systems

ASJC Scopus subject areas