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Shaping and maintaining a medium-sized main channel in the lower yellow river

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International Journal of Sediment Research 2012年第3期27卷 259-270页

作者： Chun-hong HU Jian-guo CHEN Qing-chao GUO State Key Laboratory of Simulation and Regulation of Water Cycle in river Basin(SKL-WAC) China Institute of Water Resources and Hydropower Research(IWHR) International Research and Training Center on Erosion and Sedimentation(IRTCES) IRTCES SKL-WAC IWHR

This paper studies relations between bankfull discharge,lateral cross section variation and the incoming flow and sediment condition in the lower yellow river using measured data from 1950 to *** 1950 the bankfull discharge has obviously decreased and the ratio of channel width to flow depth has *** critical annual average incoming sediment coefficient（defined as the ratio of sediment concentration to discharge） and discharge at the Huayuankou station are approximately 0.012 and 1,850 m;s;,respectively,for no accumulative deposition occurring in the reach from Huayuankou to *** this basis,a mathematical model is used to study the scale of the main channel in the lower yellow river and its corresponding bankfull discharge under possible incoming flow and sediment conditions in the near *** main factors influencing the scale of the main channel are analyzed,and measures to shape and maintain a medium-sized channel are *** results show the effect of various water and sediment combinations released from the Xiaolangdi Reservoir on the shaping of the main channel and suggest that under recent incoming flow and sediment conditions,it is possible to shape and maintain a medium-sized channel with a bankfull discharge of approximate 4,000 m;s;.

关键词： the lower yellow river Xiaolangdi Reservoir Bankfull discharge Medium size channel Flow and sediment condition

Dike Breach Risks of Different Flood Conditions in the lower yellow river

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Chinese Journal of Population,Resources and Environment 2010年第1期8卷 18-27页

作者： Xia Fuqiang Wu Shaohong Yang Qinye Kang Xiangwu Ma Xin Institute of Geographical Sciences and Natural Resources Research CAS Beijing 100101 China Graduate School of Chinese Academy of Sciences Beijing 100039 China Institute of Scientific and Technical Information of China Beijing 100038 China

Based on the analysis of hanging rivers' actuality in the lower yellow river and researches related to the evaluation of dike breach risks,it is put forward that the influencing factors of dike beach risks in the lower yellow river should involve four aspects,the flow and sediment movement,the regional crustal stability,the variation of river regime and the stability of river *** this,the evaluation indexes system of dike breach risks is established,and with the support of geographic information systems technology,the model of multi-hierarchical fuzzy comprehensive judgment is applied to estimate the dike beach risks of the hanging rivers in the lower yellow river under different flood *** evaluation results of dike breach risks show the following distributing regularities of dike breach risks in the lower yellow river:(1) Dike breach risks increase with the increase of the flood.(2) Dike breach risks decrease with the changes of river patterns along the channel.(3) There are great risks of dike breach in the wandering reaches,and it is relatively higher in the south bank than in the north in wandering reaches.(4) There is a higher dike breach risk in the north bank than in the south in winding ***,the evaluation results manifest that the evaluation indexes system established from the flow and sediment movement,the regional crustal stability,the variation of river regime and the stability of river dikes can represent the actual situation of the lower yellow river more *** application of multihierarchical fuzzy comprehensive judgment can preferably resolve the problem of hanging river dike breach,which has numerous influencing factors and complicated functionary *** applications of geographic information systems technology with powerful spatial analysis functions make dike beach risks quantificationally displayed in different spatial positions,and reflect the differences of dike beach risks in different

关键词： the lower yellow river influencing factors dike breach risk evaluation indexes system multi-hierarchical fuzzy comprehensive judgment

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GEOMORPHIC THRESHOLDS FOR CHANNEL EVOLUTION IN the lower yellow river

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International Journal of Sediment Research 2004年第3期19卷 191-201页

作者： Zhongyan LI and Zhongchen LU Associate professor, Computing Institute of Science and Engineering, North China Electric Power University, Beijing 102206, E-mail: lizhongyan11@sina.comProfessor, Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085 Associate professor Computing Institute of Science and Engineering North China Electric Power University Beijing 102206 Professor Research Center for Eco-Environment Sciences Chinese Academy of Sciences Beijing 100085

Channel evolution refers to boundary changes of rivers affected by fluvial actions. This paper provides an analysis of the development and formation of stream patterns in the lower yellow river and presents intensive studies of several critical problems relating to channel evolution, including thresholds of channel gradient and longitudinal profile adjustment, channel surface morphology, response of channel pattern to boundary conditions, critical discrimination of cross sections and the discrimination of channel pattern changes using hydrologic parameters.

关键词： Channel evolution Geomorphic thresholds the lower yellow river

A MATHEMATICAL MODEL FOR UNSTEADY SEDIMENT TRANSPORT IN the lower yellow river

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International Journal of Sediment Research 2001年第2期16卷 150-158页

作者： ZHANG Hongwu1, HUANG Yuandong1 and ZHAO Lianjun2 1 Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China 2 yellow river Institute of Hydraulic Research, Zhengzhou 450003, China Department of Hydraulic Engineering Tsinghua University Beijing 100084 China yellow river Institute of Hydraulic Research Zhengzhou 450003 China

A one-dimensional mathematical model for unsteady sediment transport in the lower yellow river is developed. A coefficient of sediment distribution is defined to represent the ratio of the bottom to the average concentration under the equilibrium conditions. The coefficient is not constant and is evaluated by using an empirical expression obtained by integrating the sediment concentration along water depth. The concentration distributions and the mean diameter distributions of suspended sediment in the transversal direction are also estimated in this model. A four-point (Preismann type) finite difference scheme and TDMA are employed in the numerical method. Three typical floods occurd in 1977,1982 and 1996, respectively, in the lower yellow river from Tiexie to Shunkou with a length of 393.67km are numerically simulated with the model. The computed results, such as the water stage, discharge, and sediment concentration agree well with the measured data.

关键词： Mathematical model Unsteady sediment transport the lower yellow river Floods

DEVELOPMENT OF LONGITUDINAL PROFILE OF THE lower yellow river

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International Journal of Sediment Research 1999年第1期 57-65页

作者： YIN Xueliang 1, CHEN Jingrong 2, LIU Xia 3, and LIANG Zhiyong 4

１ＩＮＴＲＯＤＵＣＴＩＯＮＦｒｏｍ１４ｔｏｅａｒｌｙ２０ｃｅｎｔｕｒｙ，ｔｈａｔｉｓｉｎｔｈｅＭｉｎｇａｎｄＱｉｎｇＤｙｎａｓｔｉｅｓｉｎＣｈｉｎａ，ｔｈｅｒｅｅｘｉｓｔｅｄａｐｏｉｎｔｏｆｖｉｅｗｔｈａｔｔｈｅｃｏ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＦｒｏｍ１４ｔｏｅａｒｌｙ２０ｃｅｎｔｕｒｙ，ｔｈａｔｉｓｉｎｔｈｅＭｉｎｇａｎｄＱｉｎｇＤｙｎａｓｔｉｅｓｉｎＣｈｉｎａ，ｔｈｅｒｅｅｘｉｓｔｅｄａｐｏｉｎｔｏｆｖｉｅｗｔｈａｔｔｈｅｃｏｎｔｉｎｕｏｕｓｓｉｌｔａｔｉｏｎ...

关键词： Longitudinal profile the lower yellow river Silt stable Retrogressive deposition

A 2D MATHEMATICAL MODEL FOR THE BED DEFORMATION IN the lower yellow river

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International Journal of Sediment Research 2003年第2期 176-191页

作者： Junqiang XIA,Guangqian WANG Assistant Prof. Department of Hydraulic Engineering Tsinghua University Prof. Department of Hydraulic Engineering Tsinghua University Beijing 100084 China Beijing 100084 China

This paper studies the nature of bank erosion in the lower yellow river. Numerical models available for simulating the longitudinal and lateral deformation of a riverbed are compared. Most of them are not applicable to model the bed deformation in the lower yellow river. A two-dimensional (2D) composite model consisting of a 2D flow-sediment mathematical submodel and a riverbank retreat and advance submodel is developed to simulate the longitudinal and lateral deformation. The model is validated through an example of the bed deformation process of the Huayuankou-Laitongzhai reach of the lower yellow river. The results agree well with the measured data in the water level, velocity fields, and variations of cross-sectional profiles. The model is capable of simulating the longitudinal deformation of a riverbed and the processes of bank retreat and advance, especially the process of bank lateral erosion and failure.

关键词： the lower yellow river Bank erosion and failure Longitudinal and lateral deformation of a riverbed Bank erosion model 2D composite model

DIVERTING SEAWATER TO SCOUR THE ESTUARY-A QUEST FOR NEW APPROACH TO REGULATEthe lower yellow river-

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International Journal of Sediment Research 1999年第4期 1-9页

作者： Bingnan LIN1 Jianjun ZHOU2 and Ren ZHANG2(1Prof. and Dir. Emeritus, China institute of Water Resources and Hydropower Research, Chairman of AdvisoryCouncil, IRTCES, P.O. Box 366, 100044 Beijing China.)(2Professors. Dept. of Hydraulic Engineering, Tsin

the lower yellow river is an above-the-ground river. Flood control has always been a critical *** prolong dry spell and large-scale withdrawal of river water by the riparian people have causedthe river to dry up for a certain period every year since 1972, flood is still threatening, because a dry spellmight well be followed by a wet one in the future. During the past dry years. however, the main channelhas been silted up in many places because of inadequate flow for the transport of heavy sediment *** stages for the same flood would then be higher and the flow pattern more unpredictable. The leveesare thus exposed to greater danger. In order to restore the main channels, scour by diverting seawater isproposed. Altogether about 360 km of the river may be deepened. In addition to scouring, discharge ofturbid saline flow to Bohai sea would help ease the ecological and environmental problems there. Thefresh water supply of the estuarine area may be increased by trading the fresh water flow originally setaside for scouring with that of seawater.

关键词： Seawater souring the lower yellow river Above-the-ground river. Water resources

NUMERICAL SIMULATION OF river SEDIMENTATION AND ITS APPLICATION IN the lower yellow river

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NUMERICAL SIMULATION OF RIVER SEDIMENTATION AND ITS APPLICAT...