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您的检索式：作者名="Hide Sakaguchi"
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| 1 | Proposal of FEM implemented with particle discretization for analysis of failure phenomena显示文摘 | Muneo Hori Kenji Oguni Hide Sakaguchi | 2004 | Journal of the Mechanics and Physics of Solids2004，，3： | 2 |
| 2 | Quasi-stationary flow structure in turbidity currents显示文摘A turbidity current is a particle-laden current driven by density differences due to suspended sediment particles.Turbidity currents can transport large amounts of sediment down slopes over great distances,and play a significant role in fluvial,lake and submarine systems.To better understand the sediment transport process,the flow system of an experimentally produced turbidity current in an inclined flume was investigated using video processing.We observed that the current progresses with constant frontal velocity and maintains an unchanged global interface geometry.In addition,the spatio-temporal profiles of the inner mean and turbulence velocity obtained by ultrasound velocity profiler(UVP)showed that similar distributions were maintained,with low dissipation.The results indicate that the turbidity current progressed in a quasi-stationary state,which enabled long-distance sediment transport.To understand the mechanisms behind the quasi-stationary flow,we analyzed the forces acting on the turbidity current.We found that under particular densities of suspended particles,the gravitational force is balanced by the viscous forces along the slope direction.We conclude that this specific force balance induces the quasi-stationary flow structure,enabling the long-distance transport of a substantial amount of sediment downstream with low dissipation. | Shun Nomura Giovanni De Cesare Mikito Furuichi Yasushi Takeda Hide Sakaguchi | 2020 | International Journal of Sediment Research2020，35，6： | 2 |
| 3 | Spatio-temporal deposition profile of an experimentally produced turbidity current with a continuous suspension supply显示文摘A turbidity current is a turbulent,particle-laden gravity current that is driven by density differences resulting from the presence of suspended sediment particles.The current travels downslope,bearing a large amount of sediment over a great distance,and forms fluvial and submarine bedforms.Knowledge of the spatio-temporal deposition profile of turbidity-deposited sediment is important for a better understanding of sediment transport by turbidity currents.In the current study,the depositional process of experimentally produced quasi-steady turbidity currents in an inclined flume was investigated using an electrical-resistance-based depositmeter.It was found that the amount of sediment deposited along the flume bottom increases linearly with time at a specific rate,and decreases exponentially in the downstream direction.Inspired by this observation,the mass conservation law was modified for the suspension layer and a simple theoretical model was proposed involving two parameters,the initial sedimentation rate and the decay constant.The proposed model reproduces the observed data from the flume experiment with high accuracy,and is consistent with the sediment transport distance of a natural example,the Bengal Fan.It was concluded that the two parameters that govern the sedimentation process are the key to estimating the deposition profile of fluvial systems. | Shun Nomura Giovanni De Cesare Mikito Furuichi Yasushi Takeda Hide Sakaguchi | 2022 | International Journal of Sediment Research2022，37，3： | 0 |
| 4 | Fabric characteristics of in situ sand with/without liquefaction verified by anisotropy of magnetic susceptibility显示文摘It is well known that fabric of sand may significantly affect mechanical behaviors and liquefaction resistance of sand.Various optical techniques are currently utilized to visualize the fabric,especially the distribution of the long axis of soil particles.However,none of these methods provides an ideal solution in laboratory tests and in situ observation.In this study,anisotropy of magnetic susceptibility(AMS)was first proposed as a convenient and efficient way to evaluate the liquefaction of clean sand.At first,investigations with scanning electron microscopy(SEM)and AMS were simultaneously conducted on two groups of soil specimens with different initial fabrics to verify the feasibility of the AMS technique.Then,80 in situ samples were collected to analyze the feature of liquefied and non-liquefied sand layers through AMS tests.It is clearly known from the test results that the natural sedimentary fabric was destroyed during liquefaction and the fabric anisotropy was greatly changed after liquefaction.The feasibility of evaluating soil fabric using the AMS survey was verified by the laboratory tests.Furthermore,the applicability of AMS in detecting liquefied layer in situ was confirmed for the first time. | Xueqian Ni Junnan Ma Hide Sakaguchi Feng Zhang | 2023 | Journal of Rock Mechanics and Geotechnical Engineering2023，15，5： | 0 |
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