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| 1 | Experiment and simulation of turbulent flow in local scour around a spur dyke显示文摘The turbulent flow in the local scour hole around a single non-submerged spur dyke is investigated with both experimental and numerical methods. The experiments are conducted under clear-water scour regime with an impermeable spur dyke. The scour geometry and flow velocities are measured in details with a high-resolution laser displacement meter,electro-magnetic velocimetries and PIV(Particle image velocimetry). A 3D non-linear k-ε model is developed to simulate the complex local flow field around the scour area. The numerical model is formulated using FVM(Finite volume method) on a collocated unstructured mesh,capable of resolving complex geometries and boundaries. It is found that the simulation results are reasonably consistent with those of the experimental measurements. Based on the study results,the nature of the flow structure around a spur dyke with local scour hole is analyzed. | Hao ZHANG Hajime NAKAGAWA Kenji KAWAIKE Yasuyuld BABA | 2009 | International Journal of Sediment Research2009，24，1： | 17 |
| 2 | A Study on Cyclone Aila Recovery in Koyra, Bangladesh:Evaluating the Inclusiveness of Recovery with Respect to Predisaster Vulnerability Reduction显示文摘The need to consider disaster risk reduction at the time of recovery is well-recognized. Viable disaster risk reduction measures should resolve the root causes of predisaster vulnerabilities. Accordingly, we investigated the recovery from the impact of Cyclone Aila in Koyra Upazila, Bangladesh, which was severely damaged by this2009 cyclone. Our research focused on understanding preAila vulnerabilities to cyclone impact and examined the degree of inclusion of vulnerability reduction measures within the recovery process. A composite methodology that included an institutional survey, key informant interviews,collection of the judgment of experts, focus group discussions, and a score-based quantification technique was adopted. Through a process of understanding pre-Aila vulnerabilities, recognition of the root causes of these inherent weaknesses, and identification of appropriate measures for pre-Aila vulnerability reduction, a set of 23 indicators were selected to represent the most desirable vulnerability reduction measures to implement duringrecovery. A score-based technique was applied to measure the degree of inclusion of vulnerability reduction within the recovery with respect to the indicators. The scoring result shows that the degree of inclusion of vulnerability reduction within the recovery was poor. The result specifies that among the 23 indicators of potential vulnerability reduction measures, 10 are completely missing and the rest are only partially included. The overall findings imply that the Koyra community continues to live with a vulnerability similar to that of the pre-Aila period. | Md.Shibly Sadik Hajime Nakagawa Rezaur Rahman Rajib Shaw Kenji Kawaike Kumiko Fujita | 2018 | International Journal of Disaster Risk Science2018，9，1： | 2 |
| 3 | Effects of hydraulic structures on river morphological processes显示文摘Study of hydraulic structures such as groins and bandal-like structures can provide valuable information on their influences on morphological processes in natural rivers.These structures usually used for bank protection and formation of deep navigation channel can locally create complex flow patterns,reduce flow velocities and also increase the flood levels.Most of the previous studies are focused on structures like groins under non-submerged flow condition.However,the recent demand of nature friendly low cost and sustainable methods for river bank protection and channel formation leads to the necessity of study different type of structures like bandal-like structures.In this context, this study investigates the flow characteristics and sediment transport process influenced by bandal-like structures through laboratory experiments.The experiments were carried out under live-bed scour condition with sediment supplied from the inlet for two submergence(non-submerged and submerged)conditions.The experimental measurements contribute to better understand the mechanism of deposition/erosion process around different type of hydraulic structures.The performance of bandal-like structures considering the erosion around the structures,the deposition near the bank and the formation of deep main channel show promising results compared with conventional structures such as groins(impermeable and permeable ones). | Hiroshi TERAGUCHI Hajime NAKAGAWA Kenji KAWAIKE Yasuyuki BABA | 2011 | International Journal of Sediment Research2011，26，3： | 2 |
| 4 | Estimation of debris flow discharge coefficient considering sediment concentration显示文摘A sabo dam has a purpose to block the path of debris flow. However, when overflow occurs, a sabo dam works as a weir, a vertical obstruction, where the fluid must flow over. Many empirical formulas and discharge coefficients for weirs relating flow depth to discharge have been proposed to calculate overflow discharges. However, only a few studies about overflow discharge coefficients are available in the case of debris flow. In this paper, experiments and numerical simulations were done to estimate debris flow discharge coefficients by considering the sediment concentration. In the numerical simulation, a complete overflow equation and a free overfall equation were implemented to calculate debris overflow discharges at a sabo dam. To determine the discharge coefficients for each equation, single factor regression analysis was used. Laboratory experiments were done to calibrate and to compare with the simulation. Study results showed that the discharge coefficients increase as the sediment concentration increases. This finding suggests debris flow discharge coefficients are derived to calculate the debris overflow discharges at a sabo dam. | Namgyun Kim Hajime Nakagawa Kenji Kawaike Hao Zhang | 2019 | International Journal of Sediment Research2019，34，1： | 2 |
| 5 | Thestructureandtheactivityofvanadylphosphatecatalysis显示文摘 | NAKAMURAM KAWAIK FUJIAWARA | 1974 | JCatal1974，34，： | 1 |
| 6 | Neutropenic colitis duringstandard dose combination chemotherapy with nedaplatin andirinotecan for testicular cancer显示文摘 | Takaoka E KawaiK Ando S | 2006 | Japan J Clin Oncol2006，36，： | 1 |
| 7 | Randomized open trial for co-mparison of proton pump inhibitors in triple therapy for Helicobacter pylori infection in relation to CYP2C19 genotype显示文摘 | Inaba T Mizuno M KawaiK | 2002 | Gastroenterol Hepatol2002，17，7： | 1 |
| 8 | ReexpressionofdevelopmentallyregulatedMAP2cmRNAafterischemia:colocalizationwithhsp72mRNAinvulnerableneurons显示文摘 | SaitoN KawaiK NowakTSJr | 1995 | JCerebBloodFlowMetab1995，15，20： | 1 |
| 9 | Toward mechanismbased antioxidant interventions: lessons from natural antioxidants显示文摘 | Kagan VE Kisin ER Kawaik K | 2002 | J Invest Dermatol2002，119，2： | 1 |
| 10 | Optic nerve damage in head trauma: clinical and experimental studies 显示文摘 | MatsuzakaiH KunitaM Kawaik | 1982 | Jpn Ophthalmol1982，26，： | 1 |
| 11 | Vascular anatomy ofthe anterolateral thigh flap 显示文摘 | KawaiK Imanishi N Nakajima H | 2004 | Plast Reconstr Surg2004，114，5： | 1 |
| 12 | Effect of blade cooling system with minimized gas temperature dilution on gas turbine performance显示文摘 | Kawaike K Kobayishi N Ikeguchi T | 1984 | Journal of Engineering for Gas Turbines and Power1984，106，4： | 1 |
| 13 | Adulthenoch-schonleinpurpurawithseverabdominalpaintreatedwithdapsoneandfactor XⅢ Concentrate显示文摘 | WatanabeS ShimomuraN KawaiK etal | 2005 | Dermatology2005，32，16： | 1 |
| 14 | The RET protooneogene : A mo- lecular therapeutic target in thyroid cancer显示文摘 | KodamaY Asai N KawaiK | 2009 | Cancer Sci2009，96，3： | 1 |
| 15 | Study on hydraulic characteristics of sabo dam with a flap structure for debris flow显示文摘The front part of the flow is very important and complex in the case of debris flow where there is an accumulation of large boulders. It is important to control or dampen the energy of the frontal part of a debris flow for the safety of the downstream area because the impact pressure of debris flow is much greater than that of clear fluid. The main objective of this study is to analyze the hydraulic characteristics of the proposed dam(i.e. closed-type dam with flap). The vertical pressure distribution of this type is compared with conventional dam types. In the experiments, the total pressure associated with major debris flows was recorded in real time by a system consisting of four dynamic pressure sensors installed on different types of dam. The results from experimental data clearly show that the dam with the flap has advantages of capturing the debris flow with large boulders and controls the total pressure by flow circulation due to presence of the flap structure compared to a closed-type dam without flap. Furthermore, the empirical coefficients of hydrodynamic and solid collision models were proposed and compared with available coefficients. | Yeonjoong Kim Hajime Nakagawa Kenji Kawaike Hao Zhang | 2017 | International Journal of Sediment Research2017，32，3： | 1 |
| 16 | The RET protooncogene : a mo- lecular therapeutic target in thyroid cancer 显示文摘 | KodmnaY Asai N KawaiK | 2005 | Cancer Sei2005，96，： | 1 |
| 17 | LackofeffectofthyroxineadministrationonelevatedthyroidstimulatinghormonereceptorantibodylevelsintreatedGraves′disease显示文摘 | TamaiH HayakiI KawaiK etal | 1995 | JClinEndocrinolMetab1995，80，： | 1 |
| 18 | Fat neerois of ostcocytes as a causativefactor in idio-pathic osteonecrois in heritable nyperlipaemic rabbits显示文摘 | Waruno H | 1980 | Clin orthop1980，，153： | 1 |
| 19 | Endoscopic sphincterotomg of the am pulla of rater 显示文摘 | Kawaik Akasaka Y Murakamik | 1974 | Gastrointest Endcsc1974，20，4： | 1 |
| 20 | On flood inundation analysis in underground space显示文摘 | Inoue K Toda K Kawaike K | | 0，，： | 1 |
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