A5020545251- Ocean Waves and Remote Sensing
- Coastal and Marine Dynamics
- Tropical and Extratropical Cyclones Research
- Oceanographic and Atmospheric Processes
- Coastal wetland ecosystem dynamics
- Fluid Dynamics Simulations and Interactions
- Wave and Wind Energy Systems
- Coastal and Marine Management
- Marine Bivalve and Aquaculture Studies
- Advanced Fiber Optic Sensors
- Fluid Dynamics and Heat Transfer
- Underwater Acoustics Research
- Geological and Geophysical Studies
- Earthquake and Tsunami Effects
- Marine and fisheries research
- Environmental Changes in China
- Spacecraft and Cryogenic Technologies
- Seismic Waves and Analysis
- Hydrological Forecasting Using AI
- Fluid Dynamics and Vibration Analysis
- Wind Energy Research and Development
- Nonlinear Photonic Systems
- Climate variability and models
- Ship Hydrodynamics and Maneuverability
- Geophysics and Gravity Measurements
Hohai University
2014-2024
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering
2012-2017
Abstract The long-term changes of ocean surface waves associated with tropical cyclones (TCs) are poorly observed and understood. Here, we present the global trend analysis TC for 1979–2022 based on ERA5 wave reanalysis. maximum height area footprint in six h reanalysis have increased globally by about 3%/decade 6%/decade, respectively. energy transferred at interface from atmosphere to has 9%/decade, which is three times larger than that reported all waves. mostly driven growing footprint....
Investigating the hydrodynamics of free-surface flow over rippled seabeds remains a key focus due to presence multiple underwater sandbars and ambient currents in coastal estuarine regions. There has been growing interest responses induced by resonant wave-current-bottom interactions. These interactions have potential transfer wave energy from waves along with their intensive instability behaviors. The behaviors are closely related conditions. If wave-current conditions deviate exact...
Studies on the variability in ocean wave climate provide engineers and policy makers with information to plan, develop, control coastal offshore activities. Ocean waves bear climatic imprints through which global system can be better understood. Using recently updated ERA5 dataset, this study evaluated spatiotemporal distribution significant height (SWH) Eastern Tropical Atlantic (ETA). The short-term trends rates of change were obtained using Mann–Kendall trend test Theil–Sen slope...
For surface gravity waves propagating over a horizontal bottom that consists of patch sinusoidal ripples, strong wave reflection occurs under the Bragg resonance condition. The critical frequency, at which peak coefficient is obtained, has been observed in both physical experiments and direct numerical simulations to be downshifted from well-known theoretical prediction. It long speculated downshift may attributed higher-order rippled free-surface boundary effects, but intrinsic mechanism...
Abstract
When moderately steep waves travel over a periodic rippled bed, class III Bragg resonance may occur due to the third-order quartet wave-bottom interaction among one bottom and three surface wave components. The theory, however, has not been experimentally confirmed. To verify existence of resonance, we consider simplest possible case involving single incident conduct series physical experiments. experiments show that as theory predicts, could generate only reflected (from subharmonic...
This work presents a novel one-layer nonhydrostatic formulation and model for nearshore waves. The proposed governing equations define velocities pressures at arbitrary distances from the still water only contain spatial derivatives of maximum second order. can be unified into existing models by defining variables middle depth neglecting certain additional terms. A Stokes-type Fourier analysis was performed to analyze formulations' properties determine location variables. exhibited clear...
Wave energy has drawn much attention as an achievable way to exploit the renewable energy. At present, in order enhance wave extraction, most efforts have been concentrated on optimizing convertor and power take-off system mechanically electrically. However, focusing specific field could also be alternative improve extraction. In this experimental study, Bragg resonance effect is applied focus Because of rippled bottom largely amplifies reflection, leading a significant increase focusing....
Intensive wave reflection occurs when the wavelengths of incident waves and bottom undulations are in a 2:1 ratio. Existing studies have included Bragg resonance phenomenon passing over continuous undulating parallel to oblique shoreline. More generally, mechanism is used as means coastal protection, rather than power generation. To focus energy specific area, here, we propose sinusoidal sandbars horizontal V-shaped pattern, which formed by two bottoms inclined at an angle each other center...
It is a challenge to simulate the hydrodynamic problems covering large deformation of free surface arising in severe circumstances with intense flow. This paper investigates algorithms based on moving particle semi-implicit method for simulating and impact loads. The algorithm discretizes fluid domain into series particles, each representing part fluid. pressure field calculation implicit, velocity explicit. Three models, including gradient model, source term, free-surface detection, have...