|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | TRANSPORT OF THE SUSPENDED SEDIMENT IN THE CHANGJIANG ESTUARY显示文摘The Changjiang River is characterized by the enormous volume of runoff and the great amount of sediment load with remarkable seasonal variation. The annual runoff sometimes is respondent to the amount of sediment load, and sometimes not. The amount of monthly sediment load after the month of the maximum runoff is larger than those before the month. The sediment concentration and net quantity of sediment transport in the vicinity of the river mouth varies greatly in time between the ebb and flood, spring and neap, and dry seasons and flood seasons. The three bifurcations also have differences in concentration and net quantity in space. Even in the same bifurcation they have differences in and out of the sand bar. At present, the North Channel is the main passage for water and sediment load emptying into the sea from the Changjiang River. More than 50 percent of the sediments from the river basin are deposited nearby the South Branch entrance and the main depositional area is situated in subaqueous delta off the South Channel. Between 122°30’E and 123°E is an important boundary for eastward sediment dispersion from which the suspended sediment are dispersed towards the east by south. | SHEN Huanting Institute of Esturaine and Coastal Research, East China Normal University, Shanghai, China LI Jiufa Institute of Esturaine and Coastal Research, East China Normal University, Shanghai, China ZHU Huifang Institute of Esturaine and Coastal Research, East China Normal University, Shanghai, China HAN Mingbao Institute of Esturaine and Coastal Research, East China Normal University, Shanghai, China ZHOU Fugen Department of Marine Geology, Tongji Univcrsity, Shanghai, China | 1992 | International Journal of Sediment Research1992，7，3： | 37 |
| 2 | The Bedload Movement in the Changjiang Estuary显示文摘- Sandwaves in the Changjiang estuary were measured with a shallow sediment profiler and an echosounder from 1978 to 1988. The data, together with grain size and bedform of sediment indicates that the bedload movement by rolling and saltation is of great significance to sediment transport and is the principal factor responsible for sandwave and sandbody development in the estuary. The sandwaves were found well-developed, which is related to the tidal range and the velocity of ebb current. However, the further growth is restricted by strong flood current prevailing in the estuary. Because of the significant bedload, the sandbodies shift obviously and frequently, and sometimes the exchange of position occurs between the sandbodies and tidal channels. As a result, ships are regularly forced to change their navigation course. | Li Jiufa, Shi Weirong, Shen Huanting Xu Haigen and Doeke Eisma Associate Professor, Institute of Estuarine & Coastal Research (1ECR), East China Normal University, Shanghai200062 Professor, IECR, East China Normal University, Shanghai 200062 Professor, Netherlands Institute for Sea Research, P. O. Box 59 1790 AB, Den Burg, Texel, The Netherlands | 1993 | China Ocean Engineering1993，8，4： | 15 |
| 3 | The rule of sediment transport on the Nanhui tidal flat in the Changjiang Estuary显示文摘The Nanhui tidal flat is located in the area of slow current where the ebb currents from the Changjiang Estuaryand the Hangzhou Bay converge and the flood current from the sea diverges into the estuary and the bay. The flat extends seaward in tongue shape and has a wide and gentle surface with a marked difference of tidal levels on its two sides, which results in the sediment longitudinal transport on the flat. The water-sediment conditions are diverse at different locations. The velocity and sediment concentration in intertidal zone are higher during the flood tide than those during the ebb tide. The net sediment transport is landward, resulting in a large amount of deposition of sediments on the shoal. However, the ebb current is the dominant one in deep-water area where the net sediment transport is seaward. There exist two circulation systems in plane view on the shoal and in its adjacent deep-water area, which results in the sediment exchanges between the flat and channel and between the estuary | Li Jiufa Institute of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China | 1991 | Acta Oceanologica Sinica1991，10，1： | 10 |
| 4 | Intratidal and neap-spring variations of suspended sediment concentrations and sediment transport processes in the North Branch of the Changjiang Estuary显示文摘Profiles of tidal current and suspended sediment concentration(SSC) were measured in the North Branch of the Changjiang Estuary from neap tide to spring tide in April 2010. The measurement data were analyzed to determine the characteristics of intratidal and neap-spring variations of SSC and suspended sediment transport. Modulated by tidal range and current speed, the tidal mean SSC increased from 0.5 kg/m3 in neap tide to 3.5 kg/m3 in spring tide. The intratidal variation of the depth-mean SSC can be summarized into three types: V-shape variation in neap tide, M-shape and mixed M-V shape variation in medium and spring tides. The occurrence of these variation types is controlled by the relative intensity and interaction of resuspension, settling and impact of water exchange from the rise and fall of tide. In neap tide the V-shape variation is mainly due to the dominant effect of the water exchange from the rise and fall of tide. During medium and spring tides, resuspension and settling processes become dominant. The interactions of these processes, together with the sustained high ebb current and shorter duration of low-tide slack, are responsible for the M-shape and M-V shape SSC variation. Weakly consolidated mud and high current speed cause significant resuspension and remarkable flood and ebb SSC peaks. Settling occurs at the slack water periods to cause SSC troughs and formation of a thin fluff layer on the bed. Fluxes of water and suspended sediment averaged over the neap-spring cycle are all seawards, but the magnitude and direction of tidal net sediment flux is highly variable. | LI Zhanhai LI Michael Z DAI Zhijun ZHAO Fangfang LI Jiufa | 2015 | Acta Oceanologica Sinica2015，34，1： | 9 |
| 5 | Flood-ebb asymmetry in current velocity and suspended sediment transport in the Changjiang Estuary显示文摘Time series measurements were conducted on suspended sediment and current velocity from neap tide to spring tide in the South Branch of the upper Changjiang Estuary in the summer of 2011. Strong flood-ebb asymmetry in the current velocity was observed in the South Branch as a result of high river runoff and tide deformation, in which the magnitude and duration of ebb currents were significantly greater than those of flood currents. The suspended sediment concentration(SSC) and suspended median grain size also exhibited remarkable flood-ebb variation; these variables were considerably larger during the ebb than during the flood and increased from neap to spring tide. Affected by the strong asymmetry in the current velocity and SSC between the flood and ebb,suspended sediment flux during the ebb was notably larger than during the flood, and a seaward tidal net flux was observed in each tidal cycle. The balance of sediment flux illustrates that the seaward sediment transport was dominated by river flow and tidal trapping and the landward sediment transport was dominated by the Stokes drift and the shear effect. Notable resuspension occurred during the spring and moderate tides. The critical velocity for the resuspension of bed sediments was estimated based on the correlation between current velocity with SSC and suspended median grain size. The results show that the critical velocity was approximately 40 cm/s during the flood phases and approximately 80 cm/s during the ebb phases because the surficial flood bed sediments located in the lower reach are much finer than the surficial ebb bed sediments located in the upper reach. The flood-ebb variation in the critical erosion velocity has significant effect on the intratidal variation of SSC and sediment transport process, and it is a common phenomenon in many estuaries of the world due to the complicated spatial distribution of bed sediments. | LI Zhanhai WANG Yaping CHENG Peng ZHANG Guoan LI Jiufa | 2016 | Acta Oceanologica Sinica2016，35，10： | 7 |
| 6 | The self-regulation process and its mechanism of channels' bed changes in the Changjiang(Yangtze) Estuary in China显示文摘Recent bathymetric changes in the Changjiang Estuary under the influence of artificial regulation engineerings and basin reservoirs have been analyzed based on the maritime charts since 1997 and recent fieldworks. The results indicate a slight erosion of the channels in the upper and middle estuary, continuing deposition and seaward move of the mouth bar crest and intensifying erosion at the nearshore seabed. It is noteworthy that the morphological evolution caused by intensive human activities dominates over the changes from nature process.First, the riverbes are eroded overall in the South Branch(SB), the South Channel(SC) and the upper and middle reaches of the North Channel(NC). The nearshore seabed outside the river mouth is being eroded slightly, which is attributed to the declining sediment supply from the Changjiang Basin due to the construction of the Three Gorges Dam upstream. The sediment above the seabed is very active and coarsened, meanwhile, sand waves are becoming more distinct. Second, a deposition occurs in the North Brach(NB), the mouth of the NC, the mouth bars of the North Passage(NP) and the South Passage(SP) and especially the main channel of the NP, where it shows a massive siltation after the deep waterway project. The reasons for the recent changes are not only the dynamic structure in estuarine mouth bars, but also the supply of sediment resuspension in a local and offshore area. Meanwhile, the severe erosion and siltation in some reaches is related to the construction of estuarine engineerings. It is indicated that the Changjiang Estuary is gradually self-adjusted and adapting to the varying natural factors and intensive human activities. The study on the mechanism of self-regulation of the recent bathymetric changes in the Changjiang Estuary has important and practical significance. | ZHANG Xiaohe LI Jiufa ZHU Wenwu CHENG Heqin CHEN Wei | 2015 | Acta Oceanologica Sinica2015，34，7： | 5 |
| 7 | Flocculation process of fine-grained sediments by the combined effect of salinity and humus in the Changjiang Estuary显示文摘For the great amount of organic compounds and the variation of salinity in the Changjiang Estuary, the study on the flocculation process of fine-grained sediments by the combined effect of salinity and humus in the high-turbid system is of critical significance for the understanding of the mechanism of the formation of the turbidity maximum (TM) .For the great amount of organic compounds and the variation of salinity in the Changjiang Estuary, the study on the flocculation process of fine-grained sediments by the combined effect of salinity and humus in the high-turbid system is of critical significance for the understanding of the mechanism of the formation of the turbidity maximum (TM) .The effects of salinity and humus on the fine-grained sediments have been analyzed through the synthetic study of the aspects of flocculation/coagulation power (F), diameter (D) and zeta potential (Z). And the microcosmic configuration of the flocs has been analyzed by using a scan electron microscope and Fourier Transform Infrared Spectrometry. The results show that: (1) with the increase of salinity, F and D become greater and Z becomes smaller, and with the increase of the concentration of humus, F becomes smaller, but D and Z become greater; (2) the microcosmic configuration of the flocculation shows that humus packs on the fine sediments in the form of salt, and the flocculation model of C-P-OM (C stands for clay; P cations; OM organic materials) can successfully demonstrate the mechanism of the formation of the fine-grained sediments in the high-turbid area of the Changjiang Estuary. | LIU Qizhen LI Jiufa DAI Zhijun LI Daoji | 2007 | Acta Oceanologica Sinica2007，26，1： | 5 |
| 8 | Distribution and fluxes of suspended sediments in the offshore waters of the Changjiang (Yangtze) Estuary显示文摘The offshore waters of the Changjiang Estuary are the transitional areas where river-supplied wa-ter and sediment are transported to the sea, and material exchanges occur with the neighbored Hangzhou Bay and the Jiangsu waters. Field observations of currents and sediment properties were conducted to study temporal and spatial distributions of suspended sediments under various dynamical conditions. The high sediment concentrations were found to occur in the western and southern waters of the offshore, and the low concentrations occurred in the eastern and northern waters. This pattern of the suspended sediment concentration (SSC) distribution is obviously influenced by the runoff and tidal current. The significant difference of along-estuary SSC distribution indicates that the SSC is reduced gradually from the west to the east, and that in the spring tide is obviously higher than in the neap tide. The methods of mechanism analysis and equal-area grids were used to calculate the suspended sediment fluxes at the typical cross sections. It was found that 44 percent of total suspended sediments from the Changjiang River were deposited in the submarine delta, and more than 27 percent of sediments were transported southernly into the Hangzhou Bay, and only 9 percent of sediments was supplied and exchanged with the northern Jiangsu waters, and about 20 percent of sediments was delivered offshore to the sea. | WAN Xinning LI Jiufa SHEN Huanting | 2009 | Acta Oceanologica Sinica2009，28，4： | 3 |
| 9 | THE TIDAL FLATS MORPHOLOGICAL DEVELOPMENT AND THE COASTAL LAND RECLAMATION IN SHANGHAI显示文摘More than 904.2 km2 of the flats are above the theorotical datum level with progressive rate of 20-200 m/a to the sea in Shanghai. Since the reclaimed land is vital important to the city, multiple approaches to accelerating siltation are proposed in the paper according to detailed study of dynamics, sedimentary structure and landform evolution based on plentiful in situ data. It is of great significance to utilize tidal flats and reclamation of land in Shanghai. | Li Jiufa(Institute of Estuanne & Coastal Research, East China Normal Univ., Shanghai 200062People’s Republic of China)Zhang Chen(Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008People’s Republic of China) | 1996 | Journal of Geographical Sciences1996，6，1： | 3 |
| 10 | Nonlinear advection,Coriolis force,and frictional influence in the South Channel of the Yangtze Estuary,China显示文摘Observation data of along-estuary and lateral current velocities over a transect located at the South Channel of the Yangtze estuary was obtained during a spring tide in August 2011.Harmonic analysis was done on the current velocities to get a mean component and a semi-diurnal component.Based on these two components,the driving mechanisms of mean lateral flow and M2 lateral tidal flow are shown and analyzed respectively.The dominant driving force of mean lateral flow is nonlinear advection and that of lateral M2 tidal flow is Coriolis force.The friction plays an important role near the bottom and surface for both lateral mean flow and M2 tidal flow. | YANG ZhongYong CHENG HeQin LI JiuFa | 2015 | Science China Earth Sciences2015，58，3： | 2 |
| 11 | Distributions of sediments of the tidal flats in response to dynamic actions,Yangtze (Changjiang) Estuary显示文摘有高空间的分辨率(总共的 432 件样品) 和流动数据的沉积样品在 Yangtze 河口的嘴酒吧区域在潮汐的公寓上被收集。数据在 2005 年 7 月, 2006 年 7 月和 2007 年 5 月被收集。样品与粒子 sizer 被分析,导致沉积分发。谷物尺寸和相关参数被分析。结果在一张第三的图被介绍。沉积主要由沙,淤泥的沙,沙的淤泥, sand-silt-clay,淤泥和粘土似的淤泥组成了。并且沙骨骼和泥土矩阵被发现。在 Nanhui 浅,淤泥骨骼能也被识别。而且,结果被讨论每浅。尽管一些深度相关性每浅、不一般的关系被发现被发现。结果如下:在 Yangtze 河口的这些潮汐的公寓定位的沉积主要由沙,淤泥的沙和淤泥组成。在沉积的中部的谷物尺寸与从 2.5 ~ 8 的一个范围是相对复杂的。排序从 1 ~ 2 的系数的分布与中部的尺寸一致。潮汐的公寓的沉积更粗糙、更好排序或更好、更坏,这被建议排序。在沉积分发的偏斜度从 0.1 ~ 0.8 变化了。另外,在 Chongming 在沉积排序系数和偏斜度的分布东方浅, Hengsha 东方浅并且 Jiuduan 浅因为在这些参数之中有密切积极的相关关系,具有类似的特征。然而,由于 Nanhui 之间的地点差别南部浅、东方浅,排序系数和偏斜度的价值有相对大的区别。沉积运输的轨道能基于沉积的分布被描述,它可能表明沉积运输由电流和波浪的二个主导的水动力学因素控制了。有更低的排序的系数的那更粗糙的沉积受影响,是可估计的主导退当前的行动和强烈波浪行动源于很快驱散的波浪精力。而且由于妨碍的分支的效果,指导了深水隧道工程的当前、打破的波浪行动,在在丁提的二个方面定位的沉积的谷物尺寸具有不平的分发特征。 | YAN Hong DAI Zhijun LI Jiufa ZHAO Jianchun ZHANG Xiaoling ZHAO Junkai | 2011 | Journal of Geographical Sciences2011，21，4： | 2 |
| 12 | Yangtze River of China: historical analysis of discharge variability and sediment flux显示文摘 | Zhongyuan Chen Jiufa Li Huanting Shen Wang Zhanghua | 2001 | Geomorphology2001，，2： | 1 |
| 13 | Sediment resuspension and implications for turbidity maximum in the Changjiang Estuary 显示文摘 | Li Jiufa Zhang Chen | 1998 | Marine Geology1998，148，： | 1 |
| 14 | Yangtze River of China: Historical Analysis of Discharge Variability and Sediment Flux显示文摘 | Chen Zhongyuan Li Jiufa Shen Huanting | 2001 | Geomorphology2001，41，： | 1 |
| 15 | Yangtze River of China:historical analysis of discharge variability and sediment flux 显示文摘 | Chen Zhongyuan Li Jiufa Shen Huangting | 2001 | Geomorphology2001，41，： | 1 |
| 16 | Fluid mud trans- portation at water wedge in the Changjiang estuary显示文摘 | Li Jiufa He Qing Xiang Weihua | 2001 | Sci-ence in China: Series B2001，49，1： | 1 |
| 17 | Sediment resuspension and implications for turbidity maximum in the Changiiang Estuary显示文摘 | Li Jiufa Zhang Chen | 1998 | Marine Geology1998，148，： | 1 |
| 18 | Effects of navigational works on morphological changes in the bar area of the Yangtze Estuary显示文摘 | Chenjuan Jiang Jiufa Li Huib E. de Swart | 2011 | Geomorphology2011，，： | 1 |
| 19 | Free Vibration Analysis of Rectangular Plate with Cutouts under Elastic Boundary Conditions in Independent Coordinate Coupling Method显示文摘Based on Kirchhoff plate theory and the Rayleigh-Ritz method,the model for free vibration of rectangular plate with rectangular cutouts under arbitrary elastic boundary conditions is established by using the improved Fourier series in combination with the independent coordinate coupling method(ICCM).The effect of the cutout is taken into account by subtracting the energies of the cutouts from the total energies of the whole plate.The vibration displacement function of the hole domain is based on the coordinate system of the hole domain in this method.From the continuity condition of the vibration displacement function at the cutout,the transition matrix between the two coordinate systems is constructed,and the mass and stiffness matrices are completely obtained.As a result,the calculation is simplified and the computational efficiency of the solution is improved.In this paper,numerical examples and modal experiments are presented to validate the effectiveness of the modeling methods,and parameters related to influencing factors of the rectangular plate are analyzed to study the vibration characteristics. | Qiuhong Li Wenhao Huang Joey Sanchez Ping Wang Qiang Ding Jiufa Wang | 2023 | Computer Modeling in Engineering & Sciences2023，，3： | 0 |
| 20 | Research on the adsorptive kinetic experiments on humus and its spacial variations in the Changjiang (Yangtze) estuary显示文摘 | Qizhen LIU Jiufa LI Gui FU Weichang LU Daoji LI | 2006 | Chinese Journal Of Geochemistry2006，25，B08： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员