RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2015, Vol. 24 >> Issue (11): 1929-1934.doi: 10.11870/cjlyzyyhj201511017

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AN ANALYSE ON THE EFFECT OF PROPELLER JET FLOW ON THE XIANGJIANG RIVERBED SEDIMENT DISTURBANCE

HU Xu-yue1,2, YU Zhi1,2, WAN Jia-gao1, SHEN Xiao-xiong1,2, XU Zu-huai3   

  1. 1. School of Hydraulic Engineering, Changsha University of Science and Technology, Changsha 410004, China;
    2. Key Laboratory of Water-Sediment Flood and Water Disaster Prevention of Hunan Provice, Changsha 410004, China;
    3. Hunan Province administration of Water Transportiaion, Changsha 410012, China
  • Received:2015-01-20 Revised:2015-04-30 Online:2015-11-20

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Abstract: Jet flow generated by the tail propeller can cause disturbance to river flows, and a further analysis is required to investigate whether such disturbance will result in re-suspension of bed sediment. Then,a comparative analysis was conducted on the research findings on the development rule of propeller jet flow .Meanwhile, a typical section of Xiangjiang River was chosen as an instance, and results from observing and measuring the prototype of propeller jet flow in the Changsha-Zhuzhou-Xiangtan section of Xiangjiang River were combined, together with geological survey data about the bed in this section. Also, the conditions for bed sediment incipient motion and suspension in this river section were calculated and analyzed, so as to determine whether the propeller jet flow affects the bed bottom sediment. The calculated results suggest that when the ambient velocity is low, the initial velocity of propeller jet flow, the water depth of riverbed and the sediment grain size are the main factors that determine the existence of sediment movement. The Changsha-Zhuzhou-Xiangtan section of Xiangjiang River basically become a reservoir;the average water depth in most river channels is much larger than the standard depth (2.8 m);the average gain size of bed sediment in this section exceeds 0.87 mm, and there is little fine-grained sediment;calculation and analysis of the disturbance caused by propeller jet flow in dry season shows that the mean velocity on the jet flow cross-section is less than the sediment incipient velocity;the sediment suspension indicator is above 4 in most cases. The above suggests that the possibility of bed sediment incipient motion and sediment re-suspension occurrence is tiny small in this section. Therefore, it can be judged that the influence on bed bottom sediment is negligible during normal ship navigation in this reservoir area.

Key words: propeller, jet flow, disturbance of bottom sediment, re-suspension, sediment incipient motion

CLC Number: 

  • X8
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