Insight into the wave transformation mechanisms via numerical simulation of acoustic fields in Piezoelectric/Metal grating/Dielectric structures

For providing a better shelter condition, it is necessary to build a breakwater in Zhongzui Bay. In order to know whether mooring area meets the requirement after engineering construction and compare the mooring area between solid breakwater and permeable breakwater, a numerical simulation method is used in the sheltering harbor of Zhongzui Bay. The used Mild-slope equation which describes wave refraction, diffraction and reflection, considers the steep slope bottom and effect of energy dissipation. It has been validated to fit for simulating wave transformation in the coastal zone. Under extreme high water level and design high water level, wave fields in the calculation area of three wave types in three different return periods are simulated by using this method respectively. In addition, wave height in front of breakwater can be provided. Then the wave parameters and the mooring area of two occasions, with and without breakwater, are gained in calculation area. Based on these results, some conclusions are presented in the end.

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New insight into the photo-transformation mechanisms of graphene oxide under UV-A, UV-B and UV-C lights

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2020.123683 ◽

2021 ◽

Vol 403 ◽

pp. 123683

Author(s):

Xuesong Cao ◽

Jian Zhao ◽

Zhenyu Wang ◽

Baoshan Xing

Keyword(s):

Graphene Oxide ◽

Transformation Mechanisms ◽

Uv C ◽

Insight Into

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Numerical Simulation of Damage to a Soil Embankment from Tsunami Overflow

Journal of Disaster Research ◽

10.20965/jdr.2009.p0469 ◽

2009 ◽

Vol 4 (6) ◽

pp. 469-478 ◽

Cited By ~ 1

Author(s):

Hiroyuki Fujii ◽

◽

Shintaro Hotta ◽

Nobuo Shuto ◽

Keyword(s):

Numerical Simulation ◽

Field Data ◽

Erosion Rate ◽

Fixed Bed ◽

Present Situation ◽

Short Wave ◽

Water Flows ◽

The Past ◽

Downstream Slope ◽

Insight Into

There have been many studies on tsunami forces acting on structures, but few studies on tsunami-induced water flows that move a lot of sands or soils, resulting in damages to such structures as road embankments and seawalls. In the present study, the damage of soil embankments by tsunami overflow is discussed. Hydraulic experiments on movable beds reveal that the erosion of the downstream slope and the scouring at the rear toe are important factors in the erosion of soil embankments. An erosion rate law is experimentally established. Current velocity measured on a fixed bed verifies the application of the CADMAS-SURF to the present situation. A numerical method to simulate the erosion of soil embankments is developed using these data. It is applied to gain insight into the Shuto diagram (2001) about the damages of embankment obtained from field data for local tsunamis of short wave period in the past. Among six tests, reasonable agreements were obtained in four cases. In other two cases, the method gave the larger erosion than the expected ones from the diagram.

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