To understand the acoustic and physical properties of piston core samples collected from the Sunda continental shelf and analyze their distribution patterns,the samples were analyzed in laboratory,from which three pro...To understand the acoustic and physical properties of piston core samples collected from the Sunda continental shelf and analyze their distribution patterns,the samples were analyzed in laboratory,from which three provinces were divided in sound speed,sound speed ratio,porosity,wet bulk density,and maximum shear strength.ProvinceⅠhad lower sound speed and sound speed ratio(<1.04),high porosity,and low wet bulk density.ProvinceⅡhad higher sound speed and sound speed ratio(>1.04),low porosity,and high wet bulk density.ProvinceⅢhad the lowest sound speed and sound speed ratio(0.99),highest porosity(81%),and lowest wet bulk density(1.34 g/cm^(3)).The distribution pattern indicates that sediment movement,sediment source,topography,and hydrodynamic conditions influenced the distribution of acoustic and physical properties.Furthermore,we investigated the relationship of the maximum shear strength to the porosity and wet bulk density,and found that the maximum shear strength was proportional to both the porosity and wet bulk density.This finding has significant implications for ocean engineering applications.展开更多
In the current study,the treatment of air/water interface has been made on dam-break induced tsunami-like wave by the Coupled Level Set and Volume of Fluid(CLSVOF)three-dimensional modelling.The overall CLSVOF method ...In the current study,the treatment of air/water interface has been made on dam-break induced tsunami-like wave by the Coupled Level Set and Volume of Fluid(CLSVOF)three-dimensional modelling.The overall CLSVOF method adopts a Tangent of Hy-perbola for INterface Capturing(THINC)scheme with the Weighted Linear Interface Calculation(WLIC)and Level Set(LS)function for capturing interface and calculating normal vector,respectively.As far as THINC/WLIC scheme is concerned,since the convection problem of the VOF function can be solved well,the numerical diffusion can be avoided.The spatial terms in the LS equation were discretized by the Optimized Compact Reconstruction Weighted Essentially Non-Oscillatory(OCRWENO)scheme with fourth-order accuracy,which can avoid false oscillation of LS solution.By combining CLSVOF method with Immersed Boundary(IB)method,the simulation of dam-break induced tsunami-like wave impacting on a stationary breakwater can be carried out.Grid sensitivity,mass error and free-surface profile are first calculated for the tsunami-like wave problem to validate the proposed numerical algorithm,which shows excellent agreement between the numerical results and experimental data.Tsunami-like waves with varied tailgater levels are then investigated.Calculations of velocity magnitude,free-surface profile and wave elevation of the tsunami-like wave are conducted to investigate its dynamics and kinematics.展开更多
基金Supported by the National Key R&D Program of China(No.2021YFF0501202)the National Natural Science Foundation of China(Nos.12374428,42176191,U22A2012,12304507)+2 种基金the Guangdong Special Support Key Team Program(Nos.2019BT02H594,GML2021GD0810)the Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)(No.SML2023SP232)the Fundamental Research Funds for the Central Universities,Sun Yat-sen University(No.24lgqb006)。
文摘To understand the acoustic and physical properties of piston core samples collected from the Sunda continental shelf and analyze their distribution patterns,the samples were analyzed in laboratory,from which three provinces were divided in sound speed,sound speed ratio,porosity,wet bulk density,and maximum shear strength.ProvinceⅠhad lower sound speed and sound speed ratio(<1.04),high porosity,and low wet bulk density.ProvinceⅡhad higher sound speed and sound speed ratio(>1.04),low porosity,and high wet bulk density.ProvinceⅢhad the lowest sound speed and sound speed ratio(0.99),highest porosity(81%),and lowest wet bulk density(1.34 g/cm^(3)).The distribution pattern indicates that sediment movement,sediment source,topography,and hydrodynamic conditions influenced the distribution of acoustic and physical properties.Furthermore,we investigated the relationship of the maximum shear strength to the porosity and wet bulk density,and found that the maximum shear strength was proportional to both the porosity and wet bulk density.This finding has significant implications for ocean engineering applications.
基金financially supported by the National Key R&D Program of China(Grant No.2016YFC0503562207)the National Natural Science Foundation of China(Grant No.51979178)+4 种基金the Department of Science and Technology of Sichuan Province(Grant No.2019YJ0118)the Fundamental Research Funds for the Central Universities(Grant No.YJ201837)the Innovation Spark Project(Grant No.SCUH0049)the Opening Foundation of Sichuan UniversityState Key Laboratory of Hydraulics and Mountain River Engineering(Grant No.Skhl1820)。
文摘In the current study,the treatment of air/water interface has been made on dam-break induced tsunami-like wave by the Coupled Level Set and Volume of Fluid(CLSVOF)three-dimensional modelling.The overall CLSVOF method adopts a Tangent of Hy-perbola for INterface Capturing(THINC)scheme with the Weighted Linear Interface Calculation(WLIC)and Level Set(LS)function for capturing interface and calculating normal vector,respectively.As far as THINC/WLIC scheme is concerned,since the convection problem of the VOF function can be solved well,the numerical diffusion can be avoided.The spatial terms in the LS equation were discretized by the Optimized Compact Reconstruction Weighted Essentially Non-Oscillatory(OCRWENO)scheme with fourth-order accuracy,which can avoid false oscillation of LS solution.By combining CLSVOF method with Immersed Boundary(IB)method,the simulation of dam-break induced tsunami-like wave impacting on a stationary breakwater can be carried out.Grid sensitivity,mass error and free-surface profile are first calculated for the tsunami-like wave problem to validate the proposed numerical algorithm,which shows excellent agreement between the numerical results and experimental data.Tsunami-like waves with varied tailgater levels are then investigated.Calculations of velocity magnitude,free-surface profile and wave elevation of the tsunami-like wave are conducted to investigate its dynamics and kinematics.
