In order to investigate the effect of salt drainage culvert installation on local water and salt transport in Binhai New Area of Tianjin,China,a typical test area was selected as the study area,and the Hydrus-2D mathematical model was established and verified by using the test data.The RMSE of soil water content ranged from 0.004 2 to 0.006 2 cm3/cm3,R2 from 0.916 7 to 0.977 3,and NSE from 0.760 6 to 0.793 1;Soil salinity RMSE ranged from 0.717 8 to 1.1694 g/kg,R2 from 0.973 2 to 0.986 1,NSE from 0.714 0 to 0.924 0,the established model can accurately simulate the soil water and salt transport under the synergistic effect of leaching and culvert drainage.The simulation results show that when the soil salinity in the 30 cm soil layer is set to 3%and the depth of the concealed pipe is fixed,there is always a concealed pipe layout spacing which corresponds to the maximum water consumption,and the water consumption decreases when the spacing between the layouts increases or decreases.There is also always a concealed pipe layout spacing,which corresponds to the 0～500 cm soil layer desalination rate as the maximum value,when the spacing increases or decreases,the desalination rate also decreases.When the width of the concealed pipe is fixed,the water consumption decreases with the increase of the concealed pipe depth,while the water consumption decreases with the increase of the concealed pipe width,the salt discharge rate increases with the increase of the concealed pipe depth.Considering the water consumption and desalination rate of drenching,a comprehensive parameter selection index α is proposed for concealed pipe laying,and the optimal combination of depth and width of 20 kinds of concealed pipe laying combinations with depth of 120cm and spacing of 200cm is determined using the index.The research results can provide guidance for the application of the technology of controlling and cutting the drainage concealed pipe in coastal dredger fill regions.
NETL
NSTL
维普
万方数据
