Study on underwater noise characteristics and mechanism of discharge flow from wide-crested weir
Qingxiang Shui, Daguo Wang, Yuxin Chen, Tao Yu, Yi Fan, Yang Dai, Shicheng Li, Shicheng Li, Shicheng Li
TL;DR
This study examines how underwater noise from discharge flows over wide-crested weirs is influenced by factors like water depth and weir height, using experiments and simulations.
Contribution
The study introduces a novel integration of physical experiments and numerical simulations to analyze and characterize underwater noise mechanisms from discharge flows.
Findings
Underwater noise sound pressure level is strongly correlated with fluctuating pressure SPL.
Downstream static water depth has the greatest negative effect on noise levels.
Mid-frequency noise energy peaks at 400–600 Hz and decays rapidly with changes in flow and weir height.
Abstract
To provide theoretical guidance and technical support for mitigating underwater noise generated by discharge flow from wide-crested weirs, this study integrates physical experiments and numerical simulations. The effects of inflow, downstream static water depth, and weir height on underwater noise sound pressure level (SPL) and fluctuating pressure SPL were analyzed using correlation methods, and the time–frequency variation mechanism of underwater noise was investigated through wavelet analysis. Results show a significant positive correlation between underwater noise SPL and fluctuating pressure SPL, indicating that fluctuating pressure can be used to characterize underwater noise variation. Downstream static water depth exerts the greatest influence, with a negative correlation to SPL, whereas inflow and weir height have relatively smaller effects, both showing positive correlations.…
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Taxonomy
TopicsAerodynamics and Acoustics in Jet Flows · Hydraulic flow and structures · Hydrology and Sediment Transport Processes