Abstract
Coarse sediment with a particle size greater than 0.05mm is the main deposit of riverbed in the lower Yellow River, the Loess Plateau is one of the concentrated source of coarse sediment, warping dam is one of the important engineering measures for gully control. Jiuyuangou basin is a typical small basin in the first sub region of hilly-gullied loess region, twenty warping dams in Jiuyuangou basin was selected as research object, samples of sediment along the main line of dam from upper, middle to lower reaches of dam fields and samples of undisturbed soil in slope of dam control basin were taken to carry out particle gradation analysis, in the hope of clearing reducing capacity on coarse sediment of different types of warping dam through the experimental data. The results show that the undisturbed soil in slope of dam control basin has characteristics of standard loess, the particle size are mainly distributed in 0.025~0.05mm, and the 0.05mm particle size of Jiuyuangou basinof loess is an obvious boundary; Particle size of sediment in 15 warping dam of Jiuyuangou basin are mainly distributed in 0.031~0.05mm with the dam tail is greater than dam front in general. The separation effect of horizontal pipe drainage is better than shaft drainage for which particle size greater than 0.05mm, notch dam is for particle size between 0.025~0.1 mm, and fill dam is for particle size between 0.016 ~ 0.1 mm, they all have a certain function in the sediment sorting.
Highlights
50% of the silt in the river channel of the lower reaches of the Yellow River is coarse sediment with a particle size > 0.05mm, the main channel sediment and coarse sediment particle size greater than 0.05mm over 70%
Coarse sediment is the main source of sediment in the main lower reaches of the Yellow Rive[1]-[3], Jiuyuangou basin is a source of one of the coarse sand in the middle reaches of the Yellow River[4], The warping dam is one of the main maintain soil engineering measures in the basin[2]-[4], It plays an important role in reducing sediment deposition in the lower reaches [5][9].Sediment in 15 warping dams of Jiuyuangou dam sample through the probe hole method[10], At the same time,the original soil sampling in the dam control basin, particle gradation analysis of samples, the difference of different types of silt Engineering Dam in Jiuyuangou dam to clear sediment sorting, in particular, the separation difference between coarse sediment with a particle size greater than 0.05mm
Jiuyuangou undisturbed soil particle size was mainly distributed in 0.025 ~ 0.05mm, the coarse silt is more than 5 times the fine silt, with standard features of loess; warping dams in sediment particle size mainly distributed in 0.031 ~ 0.05mm
Summary
50% of the silt in the river channel of the lower reaches of the Yellow River is coarse sediment with a particle size > 0.05mm, the main channel sediment and coarse sediment particle size greater than 0.05mm over 70%. Coarse sediment is the main source of sediment in the main lower reaches of the Yellow Rive[1]-[3], Jiuyuangou basin is a source of one of the coarse sand in the middle reaches of the Yellow River[4], The warping dam is one of the main maintain soil engineering measures in the basin[2]-[4], It plays an important role in reducing sediment deposition in the lower reaches [5][9].Sediment in 15 warping dams of Jiuyuangou dam sample through the probe hole method[10], At the same time,the original soil sampling in the dam control basin, particle gradation analysis of samples, the difference of different types of silt Engineering Dam in Jiuyuangou dam to clear sediment sorting, in particular, the separation difference between coarse sediment with a particle size greater than 0.05mm. On the transformation of warping dam structure in the future, extend the dam of the deposition period and service life, all have a positive effect
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