检索结果-南通市图书馆

Characteristics of river discharge and its indirect effect on the tidal bore in the Qiantang River, China

在线全文

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2023年第2期38卷 253-264页

作者： Cunhong Pan Qiushun Wang Dongzi Pan Chengfei Hu zhejiang institute of hydraulics and estuary zhejiang Provincial Key Laboratory of estuary and Coast

Based on field data of river discharge, tide, tidal bore, and riverbed topography, the characteristics of river discharge, the effect of river discharge on riverbed erosion and sedimentation, and the feedback effect of riverbed erosion and sedimentation on the tide and tidal bore in the Qiantang River are analyzed. The results show that the inter-annual and seasonal variation of river discharge in the Qiantang River is noticeable, while the seasonal distribution of river discharge tends to be uniform after the construction of Xin’anjiang Reservoir. River discharge has a major effect on the erosion and sedimentation in the reach from Zhakou to Yanguan. There are laws of riverbed erosion in wet seasons and years and sedimentation in dry seasons and years. Relations in the Zhakou to Yanguan reach among the riverbed volume after the flood season, the mean and maximum river discharge during the flood season, and riverbed volume before the flood season are established. With the riverbed erosion from Zhakou to Yanguan, the low tide level decreases and the tidal range is amplified, and thus, the tidal bore is enhanced. The relation among tidal range, river discharge, and riverbed volume, as well as the one between the tidal bore height and tidal range is established on the basis of the field data. Furthermore, the variation range of tidal bores after the flood season is analyzed in wet and dry years. The indirect effect of the Xin’anjiang Reservoir on the height of the tidal bore is predicted and the mean height of the tidal bore from Zhakou to Yanguan decreases by 0.1-0.2 m.

关键词： Qiantang River Tidal bore Tide River discharge Riverbed erosion Riverbed sedimentation

Effect of dike line adjustment on the tidal bore in the Qiantang estuary,China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2017年第3期29卷 452-459页

作者：曾剑陈刚潘存鸿张芝永 zhejiang institute of hydraulics and estuary Hangzhou 310020China zhejiang Provincial Key Laboratory of estuary and Coast Hangzhou 310020China

In this paper,the effect of the dike line adjustment on the Qiantang Tidal Bore（QTB）is studied by physcial experiments.A lab-scale physical model of the Qiantang estuary is built and the tidal bore is *** this model,the formation and pro-pagation processes of the tidal bore are simulated with or without the dike line *** is shown that the adjusted dike line changes the direction of the reflected tidal *** height of the tidal bore increases in the upstream region where the dike line is *** the tested bent and forking regimes,the bore height at the upstream station is increased by 0.10 m and 0.04 m,***,the crossing bore still exists near the Daquekou station and the location slightly moves by about 3 km to the downstream region.

关键词： Qiantang estuary tidal bore physical model dike line land use

Experimental hydrodynamic study of the Qiantang River tidal bore

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2013年第3期25卷 481-490页

作者：黄静潘存鸿匡翠萍曾剑陈刚 College of Civil Engineering Tongji University zhejiang institute of hydraulics and estuary

To study the hydrodynamics of tidal bore, a physical modeling study is carried out in a rectangular flume with considera- tions of the tidal bore heights, the propagation speeds, the tidal current velocities, the front steepness, and the bore shapes. After the validation with the field observations, the experimental results are analyzed, and it is shown that：（1） the greater initial ebb velocity or the larger initial water depth impedes the tidal bore propagation, （2） the maximum bore height appears at an initial ebb velocity in the range of 0.5 m/s-l.5 m/s. （3） when the Froude number exceeds 1.2, an undular bore appears, atter it exceeds 1.3, a breaking bore occurs, and after it exceeds 1.7, the bore is broken.

关键词： rectangular flume initial flow condition tidal bore height bore shapes propagation speed

REFINED RISK ASSESSMENT OF STORM SURGE DISASTER IN COASTAL PLAIN: A CASE STUDY OF PINGYANG COUNTY

在线全文

学校读者我要写书评

暂无评论

Journal of Tropical Meteorology 2019年第3期25卷 304-311页

作者： CHEN Fu-yuan YU Pu-bing WU Xiu-guang ZHU Yun-ze Key Laboratory of estuary and Coast of zhejiang Province Zhejiang Institute of Hydraulics and Estuary

As the risk of storm surge on coastal plains increases, the research on disaster risk assessment is fundamental for disaster management. Disaster risk assessment tends to develop towards the direction of refinement and it gradually plays a more important role. According to the characteristics of storm surge disaster in coastal plain, the paper uses refined floodplain numerical model which combines typhoon, flood, astronomical tide and waves to simulate inundation process. The model also considers influencing factors of dike-breaking, micro-topography and buildings. Precise calculation is executed for the range and the submerged depth caused by floodplain flow in coastal plain. Based on 3 S technology, disaster-bearing bodies are subdivided into the smallest unit of the ground object, and the vulnerability of these units is evaluated. Refined risk assessment of storm surge disaster for the coastal plain is obtained, and the detailed distribution of risk areas at different risk levels is achieved. These results can be widely applied in many fields,such as disaster prevention and mitigation, urban planning, industrial arrangement, disaster insurance and so on.

关键词： coastal plain storm surge submergence risk assessment

An analysis of dam-break flow on slope

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2014年第6期26卷 902-911页

作者：王立辉潘存鸿 College of Civil Engineering Fuzhou University zhejiang institute of hydraulics and estuary

The one-dimensional steep slope shallow water equations are used to model the dam-break flow down a uniform slope with arbitrary inclination, and analytical solutions are derived by the hodograph transformation and the Riemann＇s method in terms of evaluated integrals. An implicit analytical solution is obtained to evaluate the spatio-temporal distributions of dam-break flood hydrographs along the slope. For convenience, the solution for representative wave profiles and velocity distributions is shown in charts. Comparing with the Dressler＇s solution and WES experimental data, the analytical solution is seen reasonable.

关键词： dam-break flow slope hodograph transformation Riemann's method

Tidal Bore Dynamics Around the Similar Right-Angle Shoreline in the Qiantang estuary,China

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2022年第5期36卷 827-838页

作者： WANG Qiu-shun PAN Cun-hong CHEN Fu-yuan zhejiang institute of hydraulics and estuary Hangzhou 310020China zhejiang Provincial Key Laboratory of estuary and Coast Hangzhou 310020China

Tidal bores are a unique hydrodynamic phenomenon during flood tide in the Qiantang *** tidal bore propagation around the similar right-angle shoreline is rarely documented in tidal *** investigate tidal bores around this shoreline,a hydrodynamic model combined with a theoretical method is employed to reveal the characteristics of the bore *** theoretical solution of the tidal bore intensity is deduced to illustrate the relationship of the incident tidal bores and the back-flow bores during the *** hydrodynamic model based on shallow water equation is employed to perform the simulation of tidal bores in the *** results with respect to the bore height and the propagation speed of tidal bores have a favourable agreement with field *** tidal bore dynamics in the neighborhood of the similar right-angle shoreline are *** characteristics of tidal bores in terms of water surface,velocity,bore steepness and the intensity are illustrated and the back-flow bore is analyzed by numerical and theoretical methods around the similar right-angle *** height of the back-flow bore relative to the incident tidal bore ranges from 1.05 to *** result reveals that the ambient water depth and the shape of the similar right-angle shoreline are contributed to the back-flow bore formation.

关键词： back-flow bore numerical model shallow water equation Qiantang estuary tidal bores

Tidal analysis in the venturi-shaped area between Zhenhai and Shenjiamen in the East China Sea

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Oceanology and Limnology 2009年第1期27卷 103-111页

作者：吕华庆胡建炯 Marine Science School of zhejiang Ocean University zhejiang institute of hydraulics & estuary

In order to better understand the general tidal features in the venturi-shaped area between Zhenhai and Shenjiamen in the northern coastal region of zhejiang Province in the East China Sea, the tidal data were obtained from both the three permanent tide stations of Zhenhai, Dinghai and Shenjiamen, and four temporary tide stations of Mamu, Chuanshan, Guoju and Liuheng, along with the current speed being observed at Luotou Waterway. Results from harmonic analysis show that: (1) The area was dominated by shallow water tides with irregular semi-diurnal features, and the smallest tidal range occurred in the area near a crossing line between Zhenhai and Dinghai stations, indicating that a tidal node existed in the southern Hangzhou Bay; (2) Formulae, HS2/HM2 >0.4 and gM2-(gK1+gO1)=270° (where H and g are harmonic constants), could be used as judging criteria for high and low tidal level diurnal inequalities; (3) The duration difference between ebb and flood tides could be roughly assessed by the ratio of HM4 vs. HM2; and the larger the ratio is, the bigger the duration difference is. At the same time, the duration period could be assessed by 2gM2-gM4, the epoch difference between M2 and M4 tidal constituents. If 2gM2-gM4 <180°, then the ebb duration is longer than the flood duration; if 180°< 2gM2-gM4 <360°, the result is reversed; (4) Taking Dinghai station as a center point, the highest tidal levels and the average high tidal levels, as well as the average tidal ranges at all stations became higher and larger both southeastwards and northwestwards, while the lowest tidal levels and the average low tidal levels appeared to be lower both southeastwards and northwestwards; and (5) The tidal patterns were not all in line with the tidal current patterns. As a conclusion, the smallest tidal range occurred in the narrow part of the venturi-shaped area. Along the both sides of the area, the highest tidal level and tidal range became higher and larger, while the lowest tidal lev

关键词： East China Sea harmonic analysis Luotou Waterway tidal features venturi-shaped area zhejiang coastal water

Analytical Solution for Wave-Induced Response of Seabed with Variable Shear Modulus

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2007年第3期21卷 389-400页

作者：王立忠潘冬子潘存鸿 College of Civil Engineering and Architecture Zhejiang University zhejiang institute of hydraulics and estuary

A plane strain analysis based on the generalized Biot＇s equation is utilized to investigate the wave-induced response of a poro-elastic seabed with variable shear modulus. By employing integral transform and Frobenins methods, the transient and steady solutions for the wave-inducod pore water pressure, effective stresses and displacements are analytically derived in detail. Verification is available through the reduction to the simple case of homogeneous seabed. The numerical results indicate that the inclusion of variable shear modulus significantly affects the wave-induced seabed response.

关键词： Frobenius method integral transform shear modulus seabed wave

Hydrodynamic Characteristics of Undular Tidal Bores in the Qiantang River Based on Field Observations

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2024年第3期38卷 505-518页

作者： ZHANG Shu-yu PAN Cun-hong ZHANG Shen-yang LI Ruo-hua CHENG Wenlong XIE Dong-feng zhejiang Tongji Vocational College of Science and Technology Hangzhou 311231China zhejiang institute of hydraulics and estuary Hangzhou 310020China

Understanding the undular tidal bores in the Qiantang River is essential for effective river management and *** breaking tidal bores have been studied extensively, reports on undular tidal bores in the Qiantang Riverremain limited. Furthermore, observed data on undular tidal bores fulfilling the requirements of short measurementtime intervals, and spring, medium, and neap tide coverage, and providing detailed data for the global vertical stratificationof flow velocity are quite limited. Based on field observations at Qige in the Qiantang estuary, we analyzedthe characteristics of undular tidal bores. The results showed that the flooding amplitude (a) of the first wave isalways larger than its ebbing amplitude (b). Moreover, the vertical distribution of the maximum flood velocity exhibitesthree shapes, influenced by the tidal range, while that of the maximum ebb velocity exhibites a single shape. Duringthe initial phase of the flood tide in the spring and medium tides, the upper water body experiences multiple oscillatingchanges along the flow direction, corresponding to the alternating process of the crest and trough of the tide levelupon the arrival of the tidal bore. The tidal range is a crucial parameter in tidal bore hydrodynamics. By establishingthe relationship between hydrodynamic parameters and tidal range, other hydrodynamic parameters, such as the tidalbore height, maximum flood depth–averaged velocity, maximum flood stratified velocity at the measurement points,and duration of the flood tide current, can be effectively predicted, thereby providing an important reference for rivermanagement and maintenance.

关键词： tidal bores Qiantang estuary tidal bore height tidal bore velocity propagation speed