Hydraulic effects of vessel-induced waves on early life stages of lake macrophytes DOI Creative Commons
Susanne Scherbaum, Juergen Geist, Yannic Fuchs

et al.

Ecological Processes, Journal Year: 2025, Volume and Issue: 14(1)

Published: May 7, 2025

Abstract Background The impact of vessel-induced waves on macrophyte communities in lakes remains controversial, due to a lack comprehensive assessments which also consider mechanistic effects ecological processes during early life stages. This study investigates both the direct and indirect such stages macrophytes case Lake Wörthersee, Austria. focuses Characeae species Najas intermedia have experienced significant declines Wörthersee. Results linear wave theory was applied model typical small waves, characterized by heights 0.05–0.30 m periods 1 3 s. Relevant characteristics for testing remobilization oospores seeds like geometric dimensions density were experimentally determined field data. Sediment samples from ten locations across six beach sites at depths ranging 0.8 2.2 collected analyzed oospore presence sediment texture. indicate that maximum scenarios can affect directly motion activation water down 3.75 m. Moderate scenarios, are assumed occur more frequently, mobilize those particles between 0.75 2.25 depth. corresponds our data, where 95% found ≥ 2 mobilization disrupts germination impedes recovery populations. Additionally, lake other fine-sediment dominated lakes, fraction sediments be initiated may indirectly altering habitat conditions turbidity nutrients. However, grain size distribution showed minimal variation with depth same sampling sites, indicating limited redistribution selected waves. No correlation abundance size. Conclusions These findings suggest impacts increased traffic vessels key factor contributing decline shallow waters triggering seeds, broader implications recreational management.

Language: Английский

Measurements of High-Froude Number Boat Wakes near a Seawall DOI Creative Commons
Steven D. Meyers, Sandy Day, Mark E. Luther

et al.

Applied Sciences, Journal Year: 2025, Volume and Issue: 15(9), P. 4807 - 4807

Published: April 26, 2025

Characterizing the coastal wave environment, typically composed of wind-driven waves and boat wakes, its interaction with built infrastructure is essential for planning sustainable resilient shoreline development protection. Objectively identifying measuring non-stationary features, particularly in longer data records remains a challenge. A gauge array four pressure sensors was deployed several weeks northernmost section urbanized Tampa Bay, FL, sheltered, shallow (mean depth 1.2 m) region frequent recreational small-boat activity. New methods analyzing these measurements were explored. The had square geometry, allowing calculation directional spectra. Most prior studies wakes could only examine amplitude nearby seawall found to be significant source reflection. Additionally, novel empirical method distinguishing them from waves, providing an estimate their duration developed. reliably identify most primary but not reflected wakes. Reflected identified manually, during times relatively high water levels when front flooded.

Language: Английский

Citations

0
Accuracy Evaluation of a Wave Monitoring System by Testing the Hydraulic Performance of Portable Low-Cost Buoys DOI Open Access
Susanne Scherbaum,

Robin Härtl,

Franziska Hübl

et al.

Water, Journal Year: 2025, Volume and Issue: 17(9), P. 1345 - 1345

Published: April 30, 2025

Lakes are complex ecosystems affected by various anthropogenic influences, including vessel-induced waves. Detecting these waves a micro-electro-mechanical system (MEMS)-based inertial measurement unit (IMU) equipped on buoy-based monitoring can help assess their impacts and support developing sustainable water ecosystem management. This study evaluated optimized the accuracy of wave-monitoring designed to detect generated recreational vessels lakes. In laboratory tests, we analyzed and, separately, compared hydraulic behavior different buoy configurations assessed IMU integration in field test campaigns. Results showed that all tested buoys exhibited mean average absolute deviation (AAD) less than 20 mm, while achieved an overall AAD 1.9 mm. For small waves, characterized wave heights < 50 IMU’s corresponds buoy’s AAD. However, for larger often significantly exceeds IMU, indicating performance limits case greater The best-performing configuration tests (mean AAD) below 10 mm (or 10% height), confirming suitability developed

Language: Английский

Citations

0
Hydraulic effects of vessel-induced waves on early life stages of lake macrophytes DOI Creative Commons
Susanne Scherbaum, Juergen Geist, Yannic Fuchs

et al.

Ecological Processes, Journal Year: 2025, Volume and Issue: 14(1)

Published: May 7, 2025

Abstract Background The impact of vessel-induced waves on macrophyte communities in lakes remains controversial, due to a lack comprehensive assessments which also consider mechanistic effects ecological processes during early life stages. This study investigates both the direct and indirect such stages macrophytes case Lake Wörthersee, Austria. focuses Characeae species Najas intermedia have experienced significant declines Wörthersee. Results linear wave theory was applied model typical small waves, characterized by heights 0.05–0.30 m periods 1 3 s. Relevant characteristics for testing remobilization oospores seeds like geometric dimensions density were experimentally determined field data. Sediment samples from ten locations across six beach sites at depths ranging 0.8 2.2 collected analyzed oospore presence sediment texture. indicate that maximum scenarios can affect directly motion activation water down 3.75 m. Moderate scenarios, are assumed occur more frequently, mobilize those particles between 0.75 2.25 depth. corresponds our data, where 95% found ≥ 2 mobilization disrupts germination impedes recovery populations. Additionally, lake other fine-sediment dominated lakes, fraction sediments be initiated may indirectly altering habitat conditions turbidity nutrients. However, grain size distribution showed minimal variation with depth same sampling sites, indicating limited redistribution selected waves. No correlation abundance size. Conclusions These findings suggest impacts increased traffic vessels key factor contributing decline shallow waters triggering seeds, broader implications recreational management.

Language: Английский

Citations

0