RESEARCH ON THE FIELD TEST OF DESILTING AND BANK-STRENGTHENING FOR THE YELLOW RIVER

摘要

Due to the large amount of sand in the Yellow River water, the sediment accumulation of the sand in the lower reaches of the river has been increasing for years. In order to control the Yellow River flood, the height of the stream channel of this river should be decreased, and the banks have to be widened and its height should be increased. Desilting and bank-strengthening is an effective path to reinforce the banks of the Yellow River by taking advantages of the silt in the river appropriately. In the Desilting and bank-strengthening project, owing to the long distance of transportation of the sand, three parallel submersible liquid-solid pumps are operated together with one or two slurry pumps in series. This paper treats the field test of the Yellow River sand transportation system.rnBased on the on-site experiment, the relationship between the transportation efficiency and sand properties, the resistance of pipeline, etc has been investigated. It is noted that the amount of sand increased the resistance of pipeline, and sand concentration had obvious effect on transportation efficiency. With the same flow-rate, the larger sand concentration is, the less time is needed to transport the same amount of sand, and the less the cost of both power consumption and the consumption water would be; With the same sand concentration, the larger the flow-rate is, the larger the production output of sand transportation and economic profits would be achieved during the same operation period. Thus, the transportation system should be recommended to run in the condition of as large flow-rate and as high concentration as possible so that the working time and the cost of production would be reduced, and better economic performance was available.