| Cite this article: | 李超,于健,李伟帅,等.扬水灌区渠道泥沙冲淤时空分布特性及临界条件[J].灌溉排水学报,0,():-. |
| LI Chao,YU Jian,LI Weishuai,et al.扬水灌区渠道泥沙冲淤时空分布特性及临界条件[J].灌溉排水学报,0,():-. |
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| Study on Spatial-Temporal Distribution Characteristics and Critical Conditions of Channel Sediment Erosion-Deposition in Pumping Irrigation District |
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LI Chao1, YU Jian2, LI Weishuai2, LI Quan3
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1.College of Water Resources and Civil Engineering,Inner Mongolia Agricultural University;2.Water Resources Research Institute of Inner Mongolia;3.Inner Mongolia Autonomous Region Dengkou Pumping Irrigation District Administration
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| Abstract: |
| The purpose of this paper is to study the sediment erosion-deposition characteristics, influence factors and channel boundary and critical hydraulic condition for fluvial equilibrium in Pumping Irrigation District. 【Method】Water sampling and hydraulic characteristics was collected and measured at different monitoring section during each irrigation period from 2010 to 2012 year to analyze the sediment gradation of grain, concentration, source and spatial-temporal distribution characteristics. The sediment carrying capacity at different discharge was calculated, Which is used to determine the relationship between sediment carrying capacity and measured concentration under current situation and improved channel. 【Result】① Channel deposition is mainly caused by the bed load with grain size greater than 75 μm , which is formed from suspended load and deposition sediment around intake after stop pumping. ②Sediment deposition appeared at water outlets of Pump station in channel upstream on the Dongfuqiao section. And the second summer irrigation would cause serious sendimentation. ③Sediment carrying capacity of current channel under discharge of water less than 30m3/s is lower than sediment concentration, which lead to sediment deposition of the whole channel. ④Combined with channel improvement, increasing bed slope to 1/7000 can increased sediment carrying capacity significantly. The non-silting critical discharge is 24 m3/s base on comprehensively analyzing of sediment carrying capacity and transport efficiency index. 【Conclusion】Fluvial equilibrium matrix and critical discharge for different sediment concentration can be used to direct the management of prevention deposition in pumping irrigation district. |
| Key words: pumping irrigation district; sediment; erosion-deposition; sediment carrying capacity; critical discharge |
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