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Zhang J.,Tianjin TEDA Landscape Construction Ltd Company | Zhang Q.,Tianjin TEDA Landscape Construction Ltd Company | Wang Z.,Tianjin TEDA Landscape Construction Ltd Company
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2011

In order to control the quality of irrigation and drainage, save water and land resources and reduce the cost of saline-alkali soil reclamation, it was necessary to design rationally irrigation and drainage engineering technical parameters. The paper proposed a new method to estimate technical parameters of irrigation and drainage engineering for coastal saline-alkali soil reclamation in Tianjin. It was assumed that soil was a homogeneous and isotropic porous medium, and the depth of flooded water on the surface of the land was very small. Under the condition of flooded leaching and draining, the water flow state can be considered two-dimensional steady. Based on Vedernikov infiltration equation, Van der Molen leaching equation and water balance equation, the solution for technical parameters was established. The proposed method was demonstrates through a case on reclamation of coastal saline-alkali soil by leaching and draining, and the results were more consistent with experience values in practical engineering. The research provided guidance for planning and design of saline-alkali soil improvement in Tianjin.


Zhang J.,Tianjin TEDA Landscape Construction Ltd Company | Zhang Q.,Tianjin TEDA Landscape Construction Ltd Company | Wang Z.,Tianjin TEDA Landscape Construction Ltd Company | Wang P.,Tianjin TEDA Landscape Construction Ltd Company | And 3 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012

In order to design reasonably irrigation and drainage engineering and improve saline soil effectively, and investigate effect of the drain spacing on desalination of soils, leaching experiments were carried out on drained coastal saline soils laid 3, 6 and 9 m spaced subsurface drains respectively. The results showed that, during the leaching stage the drainage discharges in three experimental plots were great early, then decreased and kept stable roughly several days later. The drain spacing was smaller, the greater the stable drainage discharge among three plots, and the drainage water salinity was greater also at the early stage of three times leaching. The same leaching water column, desalinization of soils in the plot with 3 m spaced subsurface drains was more uniform, and was not very uniform with 9 m spaced subsurface drains. After three times leaching, the desalinization rates of 0~1 m soil layer in the plots with 3, 6 and 9 m spaced drains were 70.93%~73.40%, 64.68%~77.47% and 56.54%~78.78% respectively. The equation was applicable to estimate soil salinity variation in the flooded and pipe-drained field, and the prediction error was a little more at the sites above drains, but was 10% or so at the other sites between drains.

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