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Bubble size distribution in surface wave breaking entraining process

Science china Earth Sciences 2007年第11期50卷 1754-1760页

作者： han lei1,2.& yuan yeli2.1 department of ocean environment, ocean university of china, qingdao 2.6003, china 2 The First Institute of oceanography, State ocean Administration, qingdao 266061, china department of ocean environment Ocean University of China Qingdao China The First Institute of oceanography State Ocean Administration Qingdao China

From the similarity theorem, an expression of bubble population is derived as a function of the air en-trainment rate, the turbulent kinetic energy (TKE) spectrum density and the surface tension. The bubble size spectrum that we obtain has a dependence of a?2.5+nd on the bubble radius, in which nd is positive and dependent on the form of TKE spectrum within the viscous dissipation range. To relate the bubble population with wave parameters, an expression about the air entrainment rate is deduced by intro-ducing two statistical relations to wave breaking. The bubble population vertical distribution is also derived, based on two assumptions from two typical observation results.

关键词： wave breaking,bubble cloud,bubble size spectrum

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Magnetostratigraphy and paleoenvironmental record of late Cenozoic sediments in the Taiyuan Basin,North china

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Journal of Palaeogeography 2024年第4期13卷 971-992页

作者： Zhi-Qiang Feng Qian LI Wei han Kun-yuan Ma Yong-Jiang Liu Rong-Zhu Wei Yan-Wei Du Yong lei Guang-Hui Li College of Geoscience and Geomatics Engineering Taiyuan University of Technology Shanxi Institute of Geological Survey Frontiers Science Center for Deep ocean Multispheres and Earth System Key Lab of Submarine Geoscience and Prospecting TechniquesCollege of Manine GeosciencesOcean University of China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and Technology College of Resources and environment Shanxi Agricultural University department of Information Engineering Shanxi University

The Taiyuan Basin is of importance for intraplate tectonic deformation in North china and contains Cenozoic strata with a maximum thickness of 3800 m.A～853.5-m-deep borehole (ZK01) with an overall core recovery rate of 85.09%was drilled at Yuci (37°35'37?N,112°39'47?E) in the central Taiyuan Basin,to obtain high-resolution records of paleomagnetism,paleoclimatic and paleoenvironmental conditions,and depositional environment of the *** obtained magnetic polarity sequence consists of 13 normal and 12 reverse zones,which correspond to C1n-C4An.2n of the geomagnetic polarity time *** data show that the evolution of ZK01 core covers the interval from 8.1 Ma to the present,and the bottoms of Pliocene,Quaternary,and Middle Pleistocene were identified in Taiyuan Basin,with a sedimentary accumulation rate ranging from 62.5 m/Ma to 175.9 m/*** data reveal that the source rocks in the study area underwent intense weathering and the sediments mainly formed in a semi-arid and oxygen-rich *** addition,paleoclimatic changes occurred at～7 Ma,3.8 Ma,and 1.7 Ma,which can be closely related to the tectonic uplift of the Loess Plateau and Tibetan Plateau,as well as the variations in the Asian monsoon and associated regional and global climatic change.

关键词： Taiyuan Basin Core sediment Magnetostratigraphy Climate change Paleoenvironment Quaternary

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