Determining Riverine Surface Roughness at Fluvial Mesohabitat Level and Its Influence on UAV-Based Thermal Imaging Accuracy DOI Creative Commons

Johannes Kühn,

Joachim Pander, Luis Habersetzer

et al.

Remote Sensing, Journal Year: 2024, Volume and Issue: 16(10), P. 1674 - 1674

Published: May 9, 2024

Water surface roughness (SR) is a highly relevant parameter governing data reliability in remote sensing applications, yet lacking appropriate methodology riverine habitats. In order to assess thermal accuracy linked SR of imaging derived from an unmanned aerial vehicle (UAV), we developed the Measurement Device (SRMD). The SRMD uses concept situ quantification wave frequency and amplitude. Data nine installed SRMDs four different fluvial mesohabitat classes presented range 0 47 waves per 30 s amplitude 6 cm. Even subtle differences between run, riffle, no-/low-flow still pool areas could be detected with SRMD. However, revealed no significant influence on infrared (TIR) imagery our study case. Overall, device expands existing methods habitat assessments has potential produce for various ecological technical ranging water quality characterizations bank stability erosion risk assessments.

Language: Английский

Multiple climate change stressors reduce the emergence success of gravel-spawning fish species and alter temporal emergence patterns DOI Creative Commons
Romy Wild, Christoffer Nagel, Juergen Geist

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 949, P. 175054 - 175054

Published: Aug. 3, 2024

Climate change, with its profound effects on stream sediment, hydrological, and temperature dynamics, will exacerbate impacts habitat conditions for many species, particularly those vulnerable early life stages relying the hyporheic zone, such as gravel-spawning fishes. Due to complex interactive nature of multiple stressor effects, we employed large-scale outdoor mesocosms systemically test how reproductive success three fish species brown trout (Salmo trutta), nase, (Chrondrostoma nasus) Danube salmon (Hucho hucho) was affected by individual combined warming (+3-4 °C), fine sediment (increase in <0.85 mm 22 %) low-flow (eightfold discharge-reduction). Fine had most detrimental effect emergence rate fry length all reducing zero trout, 9 % 4 salmon. The mortality caused surpassed that hatching distinctly, suggesting negative due hypoxia were considerably exacerbated entombment. Warming only minor a single stressor, but low flow reduced rates spring spawning nase 8 50 %, respectively. In treatments including however, responded strongly negatively, even cyprinid which showed little between stressors regarding success. also led earlier fry, implying risk asynchrony available food resources. This study dramatically shows climate change can have deleterious irrespective taxonomic or ecological traits.

Language: Английский

Citations

4
The importance of floodplain width on hydraulic variability and aquatic-riparian habitat in semi-confined, regulated river systems DOI
Rohan Benjankar, Daniele Tonina, Andrew W. Tranmer

et al.

Ecological Engineering, Journal Year: 2025, Volume and Issue: 216, P. 107637 - 107637

Published: April 12, 2025

Language: Английский

Citations

0
Morphology‐Induced Thermal Refuge in a Gravel‐Bed River DOI

John C. Frye,

Andrew W. Tranmer, Andrea Bertagnoli

et al.

Hydrological Processes, Journal Year: 2025, Volume and Issue: 39(4)

Published: April 1, 2025

ABSTRACT Climate change is increasingly impacting stream temperature, a primary control on the biological, geochemical and ecological processes in fluvial systems. In response, river restoration focusing temperature regimes creating instream thermal refuge during peak summer temperatures. Here, we evaluate effectiveness of various constructed morphologic features (e.g., pools, riffles, alcoves, plane beds spring‐fed side channels) designed to generate low‐flow conditions recently restored gravel‐bed river. To assess this, monitored groundwater table, water surface elevation, direction magnitude hyporheic fluxes spatial distribution near‐bed River‐groundwater differentials, quantified as difference elevation between were factors controlling hydrologic gaining losing patterns channel. contrast, flow‐bedform interactions generated by individual induced comparatively limited exchange, with average constituting ~0.25% discharge. While was relatively similar across features, pools contained most longitudinally cooled temperatures an 1.26°C/100 m. riffle bed little observed increased 1.43°C/100 m 0.81°C/100 m, respectively. Spring channels provided cool at their upstream ends, but slow, shallow flows rapidly warmed (3.7°C/100 m) before entering main channel due lack riparian shade. Alcove similarly influenced depth shading. Deep, well‐shaded alcoves cool‐water habitat, whereas shallow, unshaded maintained high Results outline role morphology generating that may be used better understand aquatic habitat guide future projects rivers.

Language: Английский

Citations

0
Fluvial pools as reach-scale thermal regulators DOI
Andrew W. Tranmer, Andrea Bertagnoli, A. A. Hurst

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 958, P. 177890 - 177890

Published: Dec. 12, 2024

Language: Английский

Citations

2
High water temperature significantly influences swimming performance of New Zealand migratory species DOI Creative Commons
R Crawford, Eleanor Gee, Deborah Dupont

et al.

Conservation Physiology, Journal Year: 2024, Volume and Issue: 12(1)

Published: Jan. 1, 2024

Abstract Anthropogenic structures in freshwater systems pose a significant threat by fragmenting habitats. Effective fish passage solutions must consider how environmental changes introduce variability into swimming performance. As temperature is considered the most important external factor influencing physiology, it especially to its effects on Even minor alterations water properties, such as and velocity, can profoundly affect metabolic demands, foraging behaviours, fitness and, consequently, performance success. In this study, we investigated impact of varying temperatures critical speeds four migratory New Zealand species. Our findings revealed reduction at higher (26°C) compared lower ones (8 15°C) for three out species (Galaxias maculatus, Galaxias brevipinnis Gobiomorphus cotidianus). contrast, fasciatus exhibited no temperature-related performance, suggesting species-specific responses temperature. The cold treatment did not any studied high significantly reduce ensure that are designed accommodate range changes, including spatial temporal ranging from diel decadal fluctuations. research underscores importance incorporating models habitat restoration, connectivity initiatives, conservation. influence alter migration patterns population dynamics, highlighting need adaptive conservation strategies. To resilience ecosystems account particularly context changing climate.

Language: Английский

Citations

1
Ecological indicators for restoration success: Development of fish diversity in a large restored floodplain over twelve years DOI Creative Commons
Joachim Pander,

E. J. Winter,

Juergen Geist

et al.

Ecological Indicators, Journal Year: 2024, Volume and Issue: 169, P. 112920 - 112920

Published: Dec. 1, 2024

Language: Английский

Citations

0
Determining Riverine Surface Roughness at Fluvial Mesohabitat Level and Its Influence on UAV-Based Thermal Imaging Accuracy DOI Creative Commons

Johannes Kühn,

Joachim Pander, Luis Habersetzer

et al.

Remote Sensing, Journal Year: 2024, Volume and Issue: 16(10), P. 1674 - 1674

Published: May 9, 2024

Water surface roughness (SR) is a highly relevant parameter governing data reliability in remote sensing applications, yet lacking appropriate methodology riverine habitats. In order to assess thermal accuracy linked SR of imaging derived from an unmanned aerial vehicle (UAV), we developed the Measurement Device (SRMD). The SRMD uses concept situ quantification wave frequency and amplitude. Data nine installed SRMDs four different fluvial mesohabitat classes presented range 0 47 waves per 30 s amplitude 6 cm. Even subtle differences between run, riffle, no-/low-flow still pool areas could be detected with SRMD. However, revealed no significant influence on infrared (TIR) imagery our study case. Overall, device expands existing methods habitat assessments has potential produce for various ecological technical ranging water quality characterizations bank stability erosion risk assessments.

Language: Английский

Citations

0