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PHYSICAL MODEL STUDIES ON sedimentation IN KWANGYANG PORT, KOREA

PHYSICAL MODEL STUDIES ON SEDIMENTATION IN KWANGYANG PORT, K...

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第九次河流泥沙国际学术大会

作者： Xiaodong ZHAO Jinrong MA and Naibin HAN Nanjing Hydraulic research Institute Nanjing 2.002. china. E-mail: xdzhao@***

＜正＞Kwangyang port phase in container terminal project will be constructed in Kwangyang Bay in the south of Korea. The navigation channel will be dredged from -5m to -15m. The dredged material will be disposed within a dike disposal area in the bay. Physical model was adopted to study sedimentation problem for Kwangyang container terminal project. The sediment sources of sedimentation and causes of sedimentation in the bay were analyzed. The hydrodynamic environment is relatively weak, current velocities are usually less than sediment incipient velocity, and rate of siltation is only l cm yr-1-4 cm yr-1 before the construction of the project. The flow tests showed that the effects of the project on high and low tidal levels are less than 3cm. The tidal currents in front of the wharf reduced about 10cm s-1. The total sedimentation rate of navigation channel in front of phase m container wharf is in the range of 10cm-2.cm in a normai year, 12.5cm-2.cm in a flood year. The sedimentation rate in dredged navigation channel is 2.3 times as large as that of existing case, and 3-3.5 times as large as that of the region without dredged. The sedimentation rate is generally larger during the first year after construction.

关键词： Rate of sedimentation Kwangyang port Physical model

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research ON REFLECTANCE SPECTRUM OF FINE SUSPENDED SEDIMENT

RESEARCH ON REFLECTANCE SPECTRUM OF FINE SUSPENDED SEDIMENT

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第九次河流泥沙国际学术大会

作者： Zhen HAN and Caixing YUNMinistry of education key laboratory of wave scattering and remote sensing information, Fudan University Shanghai 2.0433 china. E-mail: han-zhen@*** ycx408@china.comFengjie YANG Geoinformation Science and Engineering College of Shandong University of Scienceand Technology, 2.1019 china. Zhijun DAI and Xuezhong JIANGState key laboratory of Estuarine and Coastal research, East china Normal UniversityShanghai 2.0062.0}

＜正＞Suspended sediment is one of the most important factors concerning the water color remote sensing. The quantitative relation between the remote sensing data and suspended sediment content is the key issue in studying the suspended sediment by remote sensing technology. And the spectrum characteristics are the basis of the remote sensing research. A test aimed to simultaneously measure both the inherent optical properties and the apparent optical properties has been completed by utilizing such facilities as the ASD dual channel spectrometer, hydroscat-6 spectral backscattering sensor and LS-100Q laser scattering particle size analyzer et al., The specimens （medium value size 0.004,6mm） came from the fine sediment of tidal flat top near Xiangshan harbor, Zhejiang province. The paper calculated the remote sensing reflectance, the basic parameter of suspended sediment remote sensing quantitative inversion. Moreover, the characteristic band waves of suspended sediment and their relativity were studied. Additionally, the other spectrum characteristics of fine suspended sediment were further discussed.

关键词： Suspended sediment Spectrum Remote sensing reflectance

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A NEW ACCURATE NUMERICAL MODEL FOR DAM-BREAK PROBLEMS

A NEW ACCURATE NUMERICAL MODEL FOR DAM-BREAK PROBLEMS

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第九次河流泥沙国际学术大会

作者： Jiaquan DENG and Xiaoming WUScientific research Institute of Pearl River Water Resources Commission Ministry of Water Resources Guangzhou 510611 china. Yue ZENG Guangdong Technical College of Water Resources and Electric Engineering Guangzhou 510635 chinaWeimin WUWuhan University Wuhan 430072.china

＜正＞The dam-break problem is not a continuous flood wave problem. Traditional numerical models for open channel flows are all based on St. Venant equations while the basic assumption in St. Venant equations is that the water flow is continuous. Therefore, the traditional numerical open channel models cannot reasonably simulate dam-break problems. In this paper, a new numerical model is proposed based on integration of BGK Boltzmann equation which governs the molecule motion. There is no continuity assumption in the model. It is shown that the proposed numerical model can accurately and stably simulate dam-break problems.

关键词： Dam-break BGK Boltzmann equation BGK numerical model Open channel flow

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THE BACKWATER HEIGHT DUE TO OBSTRUCTION BY PIERS OR PILES

THE BACKWATER HEIGHT DUE TO OBSTRUCTION BY PIERS OR PILES

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第九次河流泥沙国际学术大会

作者： Guobin LINanjing Hydraulic research Institute Nanjing 2.002. china. Ruinian PU Jiangsu Hydraulic Survey and Design Institute Yangzhou 2.5009 chinaHongjun REN Yellow River’s Wanjiazhai Hydro Project Power Station Management Bureau Shanxi 036412.chinaWeijun ZHOU Jiangsu Hydraulic Survey and Design Institute Yangzhou 2.5009 china

＜正＞This paper presents research results on the backwater height due to obstruction of piers or piles. By using the momentum equation and taking into account the resistance caused by piers, an equation to calculate the backwater height was derived and compared with others. The research results indicate that the backwater increases with Froude number and resistance of piers. With regards to the normal subcritical flow, effect of Froude number can be ignored. The resistance to the flow caused by piers is affected by many factors such as shape of piers, longitudinal and transversal arrangements, depth of submergence, relative water depth, incident angles of oblique flows, number of longitudinal and transversal piers, and flow velocity, etc. Results from this equation are in general agreement with those obtained using those derived by other authors for the calculation of the backwater height under the same condition. However, the present equation takes various factors into account and can be employed in many situations.

关键词： Pier Backwater height Froude number Friction Local head loss

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