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Experimental Research on the erosion pattern and Protection Using the Extended Modelling Method

China Ocean Engineering 1997年第4期12卷 441-448页

作者： Liu Shunkuan Senior Engineer, Tianjin Port Engineering Institute, Tianjin 300222 Tianjin Port Engineering Institute Tianjin 300222 China

In the paper the extended modelling method with serial sands is used in an experimental research on the erosion patterns at the discharge outlet of a beach Hua-Neng power plant. The theoretical basis for the extended modelling method with serial sands is systematically presented in the paper and the method has been successfully employed in the sediment experiment of coastal works. According to the Froude Law, the model is designed to be a normal one with movable bed, the geometric scale lambda(L) = lambda(H) = 15, and three scales of sediment grain size are chosen, i.e., lambda(d1) = 0.207; lambda(d2) = 0.393; and lambda(d3) = 0.656. The median particle diameter of sea beach prototype sand d(50p) = 0.059 mm and the dis-changed water flow of the power plant is 21.7 m(3) / s. Three types of natural sea sands have been chosen as the serial modelling sands to extend the simulation of the prototype, thus replacing the conventional test in which artificial lightweight sands are used. As a result, this method can not only reduce the cost significantly, but also it is an advanced technique easy to use. Upon a series of tests, satisfactory results have been obtained.

关键词： extended modelling method discharge outlet erosion pattern beach protection

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Pyrite Surface after Thiobacillus ferrooxidans Leaching at 30℃

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Acta Geologica Sinica(English Edition) 2006年第3期80卷 451-455页

作者： LU Jianjun LU Xiancai WANG Rucheng LI Juan ZHU Changjian GAO Jianfeng Department of Earth Sciences State Key Laboratory for Mineral Deposits Research Nanjing University Nanjing Jiangsu 210093

In order to investigate the effect of Thiobacillusferrooxidans on the oxidation of pyrite, two parallel experiments, which employed H2SO4 solutions and acidic solutions inoculated with ThiobaciUus ferrooxidans, were designed and carried out at 30℃. The initial pH of the two solutions was adjusted to 2.5 by dropwise addition of concentrated sulphuric acid. The surfaces of pyrite before exposure to leaching solutions and after exposure to the H2SO4 solutions and acidic solutions inoculated with Thiobacillus ferrooxidans were observed by scanning electron microscopy （SEM）. There were a variety of erosion patterns by Thiobacillusferrooxidans on the bio-leached pyrite surfaces. A conclusion can be drawn that the oxidation of pyrite might have been caused by erosion of the surfaces. Attachment of the bacteria to pyrite surfaces resulted in erosion pits, leading to the oxidation of pyrite. It is possible that the direct mechanism plays the most important role in the oxidation of pyrite. The changes in iron ion concentrations of both the experimental solutions with time suggest that ThiobaciUus ferrooxidans can enhance greatly the oxidation of pyrite.

关键词： pyrite surface bio-oxidation erosion pattern Thiobacillus ferrooxidans

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A REVIEW OF RESERVOIR DESILTATION

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International Journal of Sediment Research 2000年第3期 321-342页

作者： S. Anders BRANDT Ph.D., Institute of Geography, University of Copenhagen, ster Voldgade 10, 1350 Copenhagen K., Denmark

Reservoir sedimentation is a growing problem around the world. The existing literature on reservoir desiltation has, therefore, been systematically examined and evaluated. The review is divided into three topics dealing with different aspects of reservoir desiltation. The first topic treats different hydraulic reservoir desilting-techniques. The emphases are put on flushing of already deposited sediment and routing of incoming sediments from upstream, through a reservoir, but alternative methods, such as transporting sediment through flexible pipes and siphoning, are also described. The second topic treats resulting reservoir geomorphology after hydraulic reservoir flushings. This includes cross-sectional and longitudinal variations in geomorphology due to flushing, but also the available literature on physical and analytical models. The third topic treats downstream geomorphological and sedimentological effects during and after reservoir flushing operations. Attention is given to water flow-, sediment concentration-, and deposition patterns, as well as transported and deposited sediment characteristics.

关键词： Desiltation efficiency reservoir flushing density-current venting sediment sluicing erosion pattern downstream effects flow characteristics sedimentation

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