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Measuring zero water level in stream reaches: A comparison of an image‐based versus a conventional method

Herzog, AmelieORCIDiD
Stahl, KerstinORCIDiD
Blauhut, Veit
Weiler, MarkusORCIDiD
DOI: https://doi.org/10.1002/hyp.14658
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/10394
Supplement: https://doi.org/10.6094/UNIFR/228702
Herzog, Amelie; Stahl, Kerstin; Blauhut, Veit; Weiler, Markus, 2022: Measuring zero water level in stream reaches: A comparison of an image‐based versus a conventional method. In: Hydrological Processes, Band 36, 8, DOI: 10.1002/hyp.14658.
 
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  • Abstract
A limited number of gauging stations, especially for nested catchments, hampers a process understanding of the interaction between streamflow, groundwater and water usage during drought. Non‐commercial measurement devices can help overcome this lack of monitoring, but they need to be thoroughly tested. The Dreisam River in the South‐West of Germany was affected by several hydrological drought events from 2015 to 2020 during which parts of the main stream and tributaries fell dry. Therefore it provided a useful case study area for a flexible longitudinal water quality and quantity monitoring network. Among other measurements the setup employs an image‐based method with QR codes as fiducial marker. In order to assess under which conditions the QR‐code based water level loggers (WLL) deliver data according to scientific standards, we compared its performance to conventional capacitive based WLL. The results from 20 monitoring stations reveal that the riverbed was dry for >50% at several locations and even for >70% at most severely affected locations during July and August 2020, with the north western parts of the catchment being especially concerned. Highly variable longitudinal drying patterns of the stream reaches emerged from the monitoring. The image‐based method was found valuable for identification and validation of zero level occurrences. Nevertheless, a simple image processing approach (based on an automatic thresholding algorithm) did not compensate for errors due to natural conditions and technical setup. Our findings highlight that the complexity of measurement environments is a major challenge when working with image‐based methods.
 
We monitored zero water levels in a meso‐scale catchment with temperate climate by means of image‐based and conventional water level logging techniques. A detailed analysis of the longitudinal drying patterns enables a discussion about hydrological connectivity and the processes influencing the drying.
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  • Geographie, Hydrologie [374]
Subjects:
hydrological drought
innovative sensors
longitudinal connectivity
stream reaches
streamflow intermittency
zero flow
This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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