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Experimental study on flow pattern and sediment transportation at a 90°open-channel confluence

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International Journal of sediment Research 2012年第2期27卷 178-187页

作者： Tong-huan LIU Li CHEN Bei-ling FAN Changjiang River Scientific Research Institute State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University

In this paper,the evolutions of flow pattern and sediment transportation at a 90°open-channel confluence with different discharge ratios（q;） of the tributary flow to the total flow were *** experimental result showed that the water surface profile at channel confluence was influenced by tributary mixing *** vertical distribution of the time-averaged flow velocities correlated with the discharge ratio as well as with the flow *** increase of the discharge ratio q;induced a gradually decline of the time-averaged velocity upstream of the confluence;high and low velocity regions were generated as well and a back flow separation region was formed in the cross sections *** the discharge ratio q;was relatively large,the development of the separation region was *** scouring experiments with no supplementary sediment,the motion of the bed load was intermittent and fluctuated,while the bed load discharge initially increased and then decreased *** the water in the tributary was clear,the largest local scour appeared near the shearing surface downstream of the *** bed load transport rate and the accumulative sediment transport amounted in time were recorded and analyzed for different discharge ratios q;in each *** to the results,the distinctive characteristics of a sharp-edged, channel confluence flow might be divided into six main *** experimental results are helpful for the analysis and regulation of shoals at a tributary mouth.

关键词： Channel confluence Flow pattern Separation region sediment transportation

The element-free Method and its Application in Tidal Current and sediment transportation

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The element-free Method and its Application in Tidal Current...

Prediction of sediment transportation in deep bay（Hong Kong） using genetic algorithm

第七届全国水动力学学术会议暨第十九届全国水动力学研讨会

作者： Chen Hong Institute of Architecture and Civil Engineering, Fuzhou University, Fujian, 350002

In this paper, based on the moving least squares method and the finite difference scheme, a new element-free method was proposed and used to simulate horizontal two dimension tidal current and sediment transportation ... 详细信息

关键词： moving least squares method element-free method tidal current sediment transportation

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Prediction of sediment transportation in deep bay（Hong Kong...

A methodological approach for estimating turbidity in a river

第九届国际水动力学会议

作者： Onyx W.H.Wai Department of Civil ＆ Structural Engineering The Hong Kong Polytechnic University

The genetic algorithm（GA） is a powerful method which can be used to solve search and optimization problems.A genetic algorithm with tournament selection,uniform crossover and uniform mutation is used to optimize sediment transport parameters in this *** important parameters of sediment transport,the critical shear stress for deposition and resuspension,are optimized by *** results show that GA is efficient and robust for optimizing parameters of our sediment transport simulation of Deep Bay.

关键词： sediment transportation Deep Bay Genetic Algorithm.

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International Journal of sediment Research 2011年第1期26卷 112-119页

作者： Annamaria De VINCENZO Bruno MOLINO Rosa VIPARELLI Pompilio CARAMUSCIO Department of Environmental Physics and Engineering University of Basilicata85100 PotenzaItaly SAVA Department University of Molise86100 CompobassoItaly 3. ENEL R&D Department72020 Tutorano(Br)Italy

During the operations of purging and disposal of sediments of a reservoir it is necessary to know the values of turbidity in the river downstream in natural condition,in the absence of dams or river training *** paper shows that under these conditions the ratio of the average values of sediment discharge to the annual maximum value of water discharge is a function of the average annual *** can be considered as representative synthetic index of the climatic conditions,the lithological features and the land cover of the basin,and the geometric characteristics of the river *** proposed relationship of sediment discharge as a function of water discharge were validated on the basis of data collected from different Italian regions that have very different morphological,geo-lithological and rainfall features and that are characterised by a basin area changing between a few dozen and thousands of square *** results can be considered satisfying.

关键词： Soil erosion Reservoir siltation Flushing Turbidity sediment transportation

Formation and evolution of sand deserts in Xinjiang, Northwest China： I. Provenances of desert sands

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Journal of Geographical Sciences 2014年第1期24卷 177-190页

作者： ZHU Bingqi YU Jingjie QIN Xiaoguang Patrick RIOUAL LIU Ziting XIONG Heigang Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China Key Laboratory of Cenozoic Geology and Environment Institute of Geology and Geophysics CAS Beijing 100029 China Key Laboratory of Xinjiang Oasis Ecology Ministry of Education Urumqi 830046 China

Sandy desert landscape is a geological product of arid climate and abundant sand materials supply in natural conditions, therefore the formation of sandy desert is an ideal studying object for understanding the interaction between various stratigraphic/epigenetic spheres of the earth system. However, until now, the knowledge about the provenance and formation of these deserts in Xinjiang, Central Asia is diverse and inconsistent, a systematic review is necessary. Ancient aeolian sand sediments in the internal areas of these deserts and their twin dust deposits in the Cenozoic strata surrounding the Xinjiang deserts are direct and indirect clues reflecting the provenance of sand materials and the formation and evolution of deserts. Based on the geochemical, mineralogical and isotopic evidences of desert sands and relevant deposits in the peripheral regions, this paper reviews the research progress on the development of the sandy deserts in Xinjiang, Northwest China. Many proofs proposed that desert sands in Xinjiang were mainly sourced from the ancient pluvial, alluvial and fluvial sediments and were eventually achieved because of the local sand supply. It pointed out that the settings of tectonic structure in Xinjiang had made sediments both in the Tarim Basin and the Junggar Basin being influenced greatly by regional hydrological system and aeolian processes originated from the planetary wind system of westerly, the East Asian winter monsoon and the topographical mountain-valley winds. However, the directions of transpor- tation paths are different between the hydrological dynamics and the aeolian dynamics, which are decided by the slantwise structures of the basins tectonics and the regional atmospheric circulation routes, respectively, and have determined anisotropies of the transport pathway of these sediments delivered by different agents. This results in a geological cycle of detrital sediment transportation in the two large sediment mixing, alternation and re

关键词： sandy desert provenance hydrodynamic and aeoliandynamic agents sediment transportation Xinjiang

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MORPHOLOGY AND GULLY EROSION CAUSED BY sediment TRANSPORT

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MORPHOLOGY AND GULLY EROSION CAUSED BY SEDIMENT TRANSPORT