Internal solitary waves(ISWs)of depression are commonly found in the coastal environment and are believed to re-suspend sediments in coastal regions where the waves break.In this research,the direct numerical simulati...Internal solitary waves(ISWs)of depression are commonly found in the coastal environment and are believed to re-suspend sediments in coastal regions where the waves break.In this research,the direct numerical simulation is used to study the scalar transport induced by the ISWs of depression propagating over a slope-shelf topography.The scalar in this paper is considered to represent the concentrations of very fine suspended solids or pollutants.Vortices are observed from the numerical results at the bottom boundary layer on the slope during the ISW shoaling process,resulting in a scalar transport.All in cident ISWs of depression are observed to produce a waveform inversion on the shelf.The scalar transport from a slope to a shelf is the consequence of the combined vortices at the bottom boundary layer and the overturning of the ISWs of depression,and the latter was commonly ignored in previous studies.This study shows that the ISW-induced scalar transport consists of the following four stages:the slip transport,the wash transport,the vortex transport,and the secondary transport.A dimensionless time scales of the four stages are calculated,and the beginning times of the wash transport and the secondary transport are found to be uncorrelated with the slope gradients,taking values of 1.26,4,respectively.展开更多
针对复杂地质背景下的大陆架划界问题,提出了一种新的大陆坡脚点(foot point of the continental slope,FOS)确定方法。该方法基于水深平均梯度变化计算坡脚点所在位置,并结合相反证明以及凸包性、分段性、连续性原则进行优化。以莫桑...针对复杂地质背景下的大陆架划界问题,提出了一种新的大陆坡脚点(foot point of the continental slope,FOS)确定方法。该方法基于水深平均梯度变化计算坡脚点所在位置,并结合相反证明以及凸包性、分段性、连续性原则进行优化。以莫桑比克南部陆缘为研究区域,利用2021年实测的高精度多波束地形数据,应用该方法提取了大陆架划界最关键的依据——FOS,并与联合国大陆架界限委员会使用的Geocap软件提取的结果进行对比,确认了相同的FOS位置,证明该方法是准确有效的。展开更多
基金the National Key Research and Development Program of China(Grant Nos.2016YFC0401703,2017YFC0405605)the National Natural Science Foundation of China(Grant Nos.51879086,51609068 and 51709126).
文摘Internal solitary waves(ISWs)of depression are commonly found in the coastal environment and are believed to re-suspend sediments in coastal regions where the waves break.In this research,the direct numerical simulation is used to study the scalar transport induced by the ISWs of depression propagating over a slope-shelf topography.The scalar in this paper is considered to represent the concentrations of very fine suspended solids or pollutants.Vortices are observed from the numerical results at the bottom boundary layer on the slope during the ISW shoaling process,resulting in a scalar transport.All in cident ISWs of depression are observed to produce a waveform inversion on the shelf.The scalar transport from a slope to a shelf is the consequence of the combined vortices at the bottom boundary layer and the overturning of the ISWs of depression,and the latter was commonly ignored in previous studies.This study shows that the ISW-induced scalar transport consists of the following four stages:the slip transport,the wash transport,the vortex transport,and the secondary transport.A dimensionless time scales of the four stages are calculated,and the beginning times of the wash transport and the secondary transport are found to be uncorrelated with the slope gradients,taking values of 1.26,4,respectively.
文摘针对复杂地质背景下的大陆架划界问题,提出了一种新的大陆坡脚点(foot point of the continental slope,FOS)确定方法。该方法基于水深平均梯度变化计算坡脚点所在位置,并结合相反证明以及凸包性、分段性、连续性原则进行优化。以莫桑比克南部陆缘为研究区域,利用2021年实测的高精度多波束地形数据,应用该方法提取了大陆架划界最关键的依据——FOS,并与联合国大陆架界限委员会使用的Geocap软件提取的结果进行对比,确认了相同的FOS位置,证明该方法是准确有效的。
