| This article has been：Browse 1722Times Download 2458Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.20190199 |
|
| Experimental Study on Sediment Transport Characteristics and Channel Sediment Carrying Capacity Model of Yellow River Irrigation Canal |
|
ZHAO Zhihua, WU Wengyong, WANG Jiasheng, ZHAO Yongan
|
|
1. Shihezi University, Shihezi 832000, China； 2.The China Institute of Water Resources and Hydropower Research, Beijing 100048, China; 3.Zhongshan Water Conservancy and Hydropower Survey and Design Consulting Co. LTD, Zhongshan 528403, China; 4.Yuncheng Zun Village Yellow River Irrigation Administration, Yuncheng 044099, China
|
| Abstract: |
| 【Objective】The characteristics of sediment transport and the variation of sediment gradation along the way can be explored, the way to reduce the sediment deposition of the channel can be found, and the normal operation of the irrigation area can be guaranteed.【Method】Based on the real-time monitoring and sampling of high sediment concentration flow in typical main canal of Zun Village irrigation district, the variation and gradation characteristics of suspended sediment along the process were analyzed, and four typical sediment carrying capacity formulas are brought into with regards to the measured data, and the formula of sediment carrying capacity suitable for Zun Village irrigation area was selected, which further formulated the calculation formula of channel sediment carrying capacity in Zun Village irrigation area. At the same time, based on the measured data of the reconstruction section of a main canal, the formula for calculating the balance gradient of scouring and silting in a main canal was derived.【Result】The sediment transport characteristics of different particle sizes were different. The sediment concentration of suspended matter in the main canal increases with the increase of incoming water sediment content, and the channel siltation was mainly related to the content of silt and sand particles, in which sand particles were the most sensitive to the change of sediment concentration in incoming water, and more clay particles were taken away by water flow. The channel was scoured by non-equilibrium sediment transport, therefore, the process of silting to scouring and silting equilibrium sediment transport was relatively slow. Meanwhile, the sedimentation tank could effectively reduce the sand content in the diversion water. There was still the problem of sediment deposition in the end clearance and repair section of the second main canal, that is, the remaining unmodified part of main canal. If the conditions permit, it was suggested to increase the gradient.【Conclusion】When the sediment concentration is within 2 kg/m3, the incoming water quantity of the first grade station is about 8 m3/s, and the channel basically realizes the balance of scouring and silting. |
| Key words: canals; suspended load; particle grading; countermeasures against siltation; sediment-carrying capacity |
|
|
