检索结果-南通市图书馆

flume experiment Investigation on Propagation Characteristics of Tidal Bore in A Curved Channel

China Ocean Engineering 2023年第1期37卷 131-144页

作者： FAN Jun TAO Ai-feng SHI Mo-quan LI Ying PENG Ji Key Laboratory of Ministry of Education for Coastal Disaster and Protection Hohai UniversityNanjing 210098China College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210098China The Adminstrative Committee of Nantong Haimen Sanchang Industrial Park Nantong 226121China Zhejiang University of Water Resources and Electric Power Hangzhou 310018China China Renewable Energy Engineering Institute Beijing 100120China

Tidal bore is a special and intensive form of flow movement induced by tidal effect in estuary areas, which has complex characteristics of profile, propagation and flow velocity. Although it has been widely studied for the generation mechanism, propagation features and influencing factors, the curved channel will complicate the characteristics of tidal bore propagation, which need further investigation compared with straight channel. In this study, the flume experiments for both undular and breaking bores’ propagation in curved channel are performed to measure the freesurface elevation and flow velocity by ultrasonic sensors and ADV respectively. The propagation characteristics,including tidal bore height, cross-section surface gradient, tidal bore propagation celerity, and flow velocity are obtained for both sides of the curved channel. And three bore intensities are set for each type of tidal bores. The freesurface gradients are consistently enlarged in high-curvature section for undular and breaking bores, but have distinct behaviors in low-curvature section. The spatial distributions of tidal bore propagation celerity and flow velocity are compared between concave and convex banks. This work will provide experimental reference for engineering design of beach and seawall protection, erosion reduction and siltation promotion in estuary areas with the existence of tidal bores.

关键词： tidal bore curved channel flume experiment propagation celerity bore intensity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

flume experiment on Stream Blockage by the Debris Flow From Tributary

引用

四川大学学报（工程科学版） 2005年第S1期37卷 64-70页

作者： He, Yiping Guo, Zhixue Li, Yong Cui, Peng Wang, Zhaoyin Dept. of Hydraulic and Hydro-electrical Eng. Tsinghua Univ. Beijing 100084 China Chengdu Inst. of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China State Key Lab. of Hydraulics and Mountain River Eng. Sichuan Univ. Chengdu 610065 China

Stream blockage by the debris flow from tributary valleys is a common phenomenon in mountainous area,which takes place when large quantities of sediment transported by debris flow reaches a river channel causing its complete or partial *** dam formed by debris flow may causes upstream and downstream flooding,and presents great threat to people and *** of the catastrophic influence on people and property,debris-flow dam has attracted many attentions from the researchers and local adm...

关键词： Debris flow blockage critical condition flume experiment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A STUDY OF DRAG COEFFICIENT RELATED WITH VEGETATION BASED ON THE flume experiment

引用

Journal of Hydrodynamics 2010年第3期22卷 329-337页

作者： HUI Er-qing HU Xing-e JIANG Chun-bo MA Fang-kai ZHU Zhen-duo China Three Gorges Corporation Yichang 443002 China State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China

This study is focused on the effects of ecological factors （diameter and flexibility） and vegetation community composition on the drag coefficient related with vegetation. The single leafy shrub and three mixed communities （including shrub-grass, shrub-reed and reed-grass community） were studied. The flow velocity and water level were measured and used to calculate the drag coefficient based on the Bernoulli＇s equation, Darcy drag formula and the expression for the drag coefficient related with Darcy drag factor. The trend of the drag coefficient in the vertical direction was analyzed against flow depth, diameter, diameter P（eynolds number, flow depth Reynolds number and relative roughness height in different discharges. The results show that beside the dense leafy shrubs community, the vertical trend of the drag coefficient among other cases against flow depth, diameter, diameter Reynolds number, flow depth Reynolds number and relative roughness height can be approximately expressed by power law functions under different flow discharges. Moreover, in a mixed community with two plants with distinctly different ecological factors, the one with the most distinct variations of ecological factors determines the vertical trend of the drag coefficient; the other one only affects the magnitude of the drag coefficient. Furthermore, if the ecological factors of the vegetation in the vertical direction are kept almost not changed, the drag coefficient can be approximately regarded as a constant.

关键词： vegetated channel drag coefficient flume experiment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

MODELING STUDY ON SEDIMENTATION CONFIGURATION IN FRONT OF THE DAM AND IN THE PRESSURE CONDUIT OF BOTTOM OUTLETS BY flume experiment

引用

International Journal of Sediment Research 1997年第3期 275-281页

作者： XU Guobin Senior Research Engineer, Tianjin Institute of Hydroelectric Investigation and Design and Research, Ministry of Water Resources. 60 Dongting Road, Hexi District, Tianjin 300222, P R. China. BAI Shilu Senior Research Engineer, Tianjin Institute o

This paper, taking Wanjiazhai Reservoir on the Yellow River as an example, develops the experimental method for determining sedimentation elevation in front of the dam and sedimentation configuration in the pressure conduit of bottom outlets by flume. The results obtained from the experiment are reasonable, so a new method is given to investigate sedimentation configuration in front of the dam and in the pressure conduit.

关键词： Sedimentation elevation in front of the dam Sedimentation configuration in the pressure conduit flume experiment Wanjiazhai Reservoir

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

flume experiments on responses of topography at a river mouth to change in external conditions

引用

地球环境学报 2011年第1期 311-312页

作者： Endo N Suzuki T Department of Earth Sciences Graduate School of Natural Science and TechnologyKanazawa University

flume experiments in which the silty deltas were developed under unsteady flows were *** examined several increasing and decrease rates of *** showed that sedimentary processes of a delta were aggradation at high increase rates of discharge,backstepping at middle rates,and progradation at low *** the phase of decreasing flow,there was hysteresis in the development *** if the decrease rate was the same,the process of topographic change was different according to the previous state of the delta *** we found that the development processes related with the sediment balance(erosion-sedimentation) on the topset bed that was quasi-equilibrium state at low increase rates of flow discharge,but was non-equilibrium state at high increase rates of discharge.

关键词： flume experiment river delta

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Numerical and experimental Analysis of A Vertical-Axis Eccentric-disc Variable-Pitch Turbine(VEVT)

引用

China Ocean Engineering 2020年第3期34卷 411-420页

作者： CHEN Hai-long JING Feng-mei LIU Heng-xu DING Hua-qiu KONG Fan-kai SHI Jian Yantai Research Institute and Graduate School Harbin Engineering UniversityYantai 264006China School of Mechanical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China College of Shipbuilding Engineering Harbin Engineering UniversityHarbin 150001China College of Mechanical and Electrical Engineering Harbin Engineering UniversityHarbin 150001China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China

A combined experimental and numerical investigation is carried out to study the performance of a vertical-axis eccentric-disc variable-pitch turbine(VEVT).A scheme of eccentric disc pitch control mechanism based on doubleblock mechanism is *** eccentric control mechanism and the deflection angle control mechanism in the pitch control structure are designed and optimized according to the functional requirements of the turbine,and the three-dimensional model of the turbine is *** analysis of the eccentric disc pitch control mechanism is carried *** parameters and kinematics equations which can characterize its motion characteristics are *** analysis and simulation are carried out,and the motion law of the corresponding mechanical system is *** analyzing the force and motion of blade of VEVT,the expressions of the important parameters such as deflection angle,attack angle and energy utilization coefficient are *** lateral induced velocity coefficient is acquired by momentum theorem,the hydrodynamic parameters such as energy utilization coefficient are derived,and the hydrodynamic characteristics of VEVT are also *** experimental results show that the turbine has good energy capture capability at different inflow velocities of different sizes and directions,which verifies that VEVT has good self-startup performance and high energy capture efficiency.

关键词： vertical axis variable pitch turbine eccentric disc pitch control mechanism kinematics analysis hydraulic analysis flume experiment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

experimental Investigation of the Response of Monopiles in Silty Seabed to Regular Wave Action

引用

China Ocean Engineering 2022年第1期36卷 112-122页

作者： HUANG Ting ZHANG Ji-sheng HOU Li-jun WANG Rong CHENG Ning Key Laboratory of Ministry of Education for Coastal Disaster and Protection Hohai UniversityNanjing 210098China College of Harbor Coastal and Offshore EngineeringHohai UniversityNanjing 210098China China Harbour Engineering Company Ltd. Beijing 100027China

Excessive displacement responses of monopiles affect the serviceability of offshore *** to complicated pile−seabed−wave interactions,the actual behavior of monopiles in silty seabed under periodic wave action remains unclear,and relevant studies in the literature are limited.A series of experiments were conducted in a wave flume containing single piles in silty seabed with relative density of 0.77 subjected to regular *** stages of wave loading were applied successively,accompanied by data recording which included pore water pressure,water surface elevation,pile head displacement,and pile *** of pile-head displacement and pore pressure in silty seabed was the main focus,but the effects of pile diameter,pile type,and pile stiffness were also *** experimental results indicate that,in silty seabed,piles of large diameter or with fins accelerate soil liquefaction,resulting in strengthened soil which allows a higher upper boundary of pore *** fins at deeper locations led to a quick failure of the piles,but the opposite result was observed with an increase in fin *** pile-head displacement entered its rapid development period,the wave load calculated via the pile moment was an overestimation,especially for the piles of large diameter.

关键词： monopiles regular wave flume experiment pore water pressure finned pile silty seabed

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Measuring Internal Velocity of Debris Flows by Temporally Correlated Shear Forces

引用

Journal of Earth Science 2012年第3期23卷 373-380页

作者：韦方强杨红娟胡凯衡 Sergey Chernomorets Key Laboratory of Mountain Hazards and Earth Surface Process Chinese Academy of Sciences Institute of Mountain Hazards and Environment Chinese Academy of Sciences Faculty of Geography Moscow State UniversityMoscowRussia

Debris flow is a kind of geological hazard occurring in mountain *** velocity is very important for debris flow dynamics research and designing debris flow control ***,most of past researches focused on surface velocity and mean velocity of debris flow,while few researches involve its internal velocity because there is no available method for measuring the internal velocity for its destructive *** this paper,a method of temporally correlated shear forces（TCSF） for meas-uring the internal velocity of debris flows is *** principle of this method is to calculate the internal velocity of a debris flow using the distance between two detecting sections and the time differ-ence between the two waveforms of shear forces measured at both *** measuring method has been tested in 14 lab-based flume experiments.

关键词： debris flow internal velocity velocity measuring shear force flume experiment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

experimental Simulation Study of the Dominant Enrichment Area of Terrestrial Organic Matter in the Shallow-Delta Sedimentary System of the Yacheng Formation in the Qiongdongnan Basin

引用

Acta Geologica Sinica(English Edition) 2022年第5期96卷 1693-1703页

作者： XU Xinde YANG Xibing QU Tong GAO Gang LIANG Gang LI Xing CNOOC China Limited Zhanjiang BranchZhanjiangGuangdong 524057China State Key Laboratory of Petroleum Resources and Prospecting China’s University of PetroleumBeijing 102249China College of Geosciences China’s University of PetroleumBeijing 102249China CNOOC China Limited Hainan BranchHaikou 570312China

Shallow-delta sedimentary systems receive both terrestrial and marine organic matter. As oil and gas exploration activities determine that the source rocks of the deep-water area of the Qiongdongnan Basin, northern South China Sea, are generally rich in and even dominated by terrestrial organic matter, this has led many researchers to examine the rules governing terrestrial organic matter enrichment in shallow-delta sea sedimentary systems. However, the deep burial of source rocks in deep-water areas and the relatively small amount of drilling undertaken have greatly restricted the study of these rules. In this study, the ‘forward modeling' research method was used to observe and analyze the deposition and preservation of terrestrial organic matter through flume experiments, where the depositional results were carefully depicted and sampled. The total organic carbon content of selected samples was measured and when combined with qualitative observations and quantitative comparison results, the dominant enrichment areas of terrestrial organic matter were identified. The experimental results show that the overbank parts of the delta front, the dune countercurrent surface, the low-lying parts, the delta front slope area and the shallow-prodelta sea area are where terrestrial organic matter is predominantly enriched. This provides an important basis and guidance for the prediction of the development areas of marine source rocks with terrestrial input in the deep-water areas of the Qiongdongnan Basin.

关键词： shallow-delta sea sedimentary system deep water area terrestrial organic matter flume experiment enrichment area Qiongdongnan Basin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Study of deposition of fine sediment within the pores of a coarse sediment bed stream

引用

International Journal of Sediment Research 2013年第2期28卷 210-219页

作者： N.K.KHULLAR U.C.KOTHYARI K.G.Ranga RAJU Department of Civil Engineering PAU Ludhiana-India Prof.Dr. Department of Civil Engineering IIT Roorkee-India Prof.Dr. Department of Civil Engineering IIT Roorkee-India Formerly Prof.Dr.

Elaborate experiments were performed in a 30 m long,0.5 m deep and 0.2 m wide laboratory flume to study the process of infiltration of fine sediment into the pores of coarse sediment forming the channel bed *** concentrations of suspended load of fine sediment of size 0.064 mm were passed over the channel bed made up of three different types of coarse sediments;two uniform and one *** proportion of fine sediment infiltrated into the pores of bed material for each equilibrium concentration of suspended load of fine sediment in the flow was studied during several experimental *** proportion of fine sediment within the pores of bed material increased with an increase in the equilibrium concentration of suspended load of fine sediment in the *** process continued till the pores within the coarse sediment bed were filled up to the capacity with the fine sediment transported by the flow in *** theoretical value was identified for limit for maximum proportion of fine sediment that can be present within the pores of bed *** further increase in the concentration of suspended load of fine sediment in the flow,deposition of fine sediment occurs on the surface of the flume bed in the form of ripples of the fine *** condition is defined as ’depositional condition’.experimental observations on these and related aspects are presented herein.

关键词： Fine sediment flume experiment Bed material Concentration of suspended sediment Deposition condition

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：