Through the system's indoor test, we have a certain grasp of the water and sand movement law of the muddy water pipeline transportation system, and based on the test data, based on the sand and mud movement mechanics, through regression analysis, the empirical formula of the critical non-silt flow rate of the pipeline water transmission system is obtained.
Through comprehensive analysis of the experimental research results and actual engineering verification, we can know:
1) The determination of the critical non-silt flow rate of the pipeline will directly affect the economics and safety of the pipe irrigation project in the canal irrigation area, and then affect the popularization and application of the technology in the canal irrigation area. If the critical non-silt flow rate of the pipeline is selected too large, some areas that originally meet the non-silt flow condition of the pipeline have to take other engineering measures, which will inevitably cause engineering waste; if the critical non-silt flow rate is selected to be too small, it may cause the pipeline Blockage affects project safety.
2) By comparing the empirical formula of the critical non-silt flow rate in the paper with the formulas introduced in the previous literature, the calculation value of the related formulas in the past is too large, and it is too conservative to be applied to the pipeline water conveyance system.
3) The pipeline water delivery system in the channel area is different from the well-irrigation area, because it mostly uses natural water level self-pressure irrigation, so it has no pressure compensation function. After partial siltation of the pipeline, the flow velocity in the pipeline does not change much, causing sediment to gradually accumulate. Therefore, the critical non-silt flow rate must be positively determined to ensure the safety of the system.
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