| 摘要: |
| 【目的】分析东雷抽黄引水灌区渠系泥沙淤积问题，探讨通过加大干渠输水流量以减少渠道淤积的可行性。【方法】利用东雷抽黄灌区总干渠的泥沙淤积实测资料，对水沙输移数学模型进行验证，再依据典型年份不同灌季不同时段引水含沙量高低情况，拟定了加大渠道输水流量的多种方案，对不同方案情况下渠道的冲淤过程及减淤量等进行数值模拟计算。【结果】减淤量和抽水费用等的计算结果表明，减淤效果最佳的方案是春灌期间含沙量较低时段加大渠道输水流量，该方案的减淤率为59.63%，减淤耗水费用为9元/m3，较人工清淤费用（50元/m3）节省成本82%。【结论】在春灌或夏灌含沙量较低时段，利用退水渠加大干渠输水流量减少渠道淤积在技术上是可行的，经济上也是合理的。 |
| 关键词: 东雷抽黄灌区 渠道退水 泥沙淤积 减淤方案 |
| DOI： |
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| 基金项目:陕西省水利科技项目（2017slkj-18，2014slkj-01） |
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| Effect of water release on main canal sedimentation reduction in Donglei pumping irrigation system of the Yellow River |
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WANG Xinhong,WU Wei,LEI Citao
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| Abstract: |
| 【Objective】This paper analyzed the sediment deposition in Yellow River pumping irrigation system and discussed the feasibility of reducing channel deposition by increasing main canal discharge.【Method】Based on the measured data of canal water flow and sediment concentration,the mathematical model of water sediment transport was validated and various plans to increase the flow rate were proposed according to the sediment contents in typical years.Then the model was used to evaluate different irrigation plans.【Result】According to the calculated results of sediment deposition and irrigation cost,the best option for sedimentation reduction was to increase channel water flow during the low concentration period in spring irrigation.The expected sediment reduction was 59.63% and the cost was decreased by 82% to 9 RMB/m3 in comparison with artificial dredging cost (50 RMB/mm3).【Conclusion】It is technically and economically feasible to reduce to reduce channel deposition by increasing main canal discharge in low sediment concentration period of spring or summer irrigation. |
| Key words: Donglei irrigation district water release of channel sediment accumulation sediment reduction schemes |
