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| Broadcasted fertilizer solute transport model in 2D surfacewater flow of border irrigation: I.Modeling |
| ZHANG Shao-Hui-1, 2 , XU Di-1, 2 , LI Yi-Nong-1, 2 , BAI Mei-Jian-1, 2 |
| (1.Department of Irrigation and Drainage,China Institute of Water Resources and Hydropower Research,Beijing 100048,China; 2.National Center of Efficient Irrigation Engineering and Technology Research,Beijing 100048,China) |
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Abstract The surface water depth cross land was obtained numerically by simulating the 2D full hydrodynamics model in border irrigation firstly.Then the linear and logarithmic profile of turbulent velocity along the depth in scale form was extended to those in tensor one; subsequently,a nonuniform 3D flow velocity field across the land and along vertical direction was constructed by combining the continuous equation of incompressible hydrodynamics.Eventually,a convectiondiffusion equation was adopted to describe the broadcasted fertilizer solute concentration across land and along depth of water in border irrigation.The diffusion coefficient was determined by using the nearby wall nonuniform flow velocity model.The initial condition was determined with the thin water layer hypothesis in surface water flow simulation of border irrigation.The overland boundary for solute dissolution and transportation was imposed by using a firstorder kinetics reaction model and mass conservation equation of solid fertilizer at a point.In this way,a fertilizer solute transport model is proposed in a 2D surface flow of border irrigation.
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Received: 26 April 2011
Published: 30 January 2010
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| 参考文献(References)［1］Murillo J,GarcíaNavarro P,Burguete J.Analysis of a secondorder upwind method for the simulation of solute transport in 2D shallow water flow［J］.International Journal for Numerical Method in Fluids,2008,56(4):661-686.［2］梁艳萍,许迪,李益农,等.畦灌施肥模式对土壤水氮时空分布的影响［J］.水利学报,2008,39(11):1221-1228.Liang Yanping,Xu Di,Li Yinong,et al.Influence of border strip fertigation on spatial and temporal distribution of soil water and nitrate nitrogen ［J］.Journal of Hydraulic Engineering,2008,39(11):1221-1228.(in Chinese)［3］Abbasi F,Simunek J,van Genuchten M T,et al.Overland water flow and solute transport:model development and field data analysis［J］.Journal of Irrigation and Drainage Engineering,2003,129(2):71-81.［4］Zerihun D,Fuman A,Warrick A W,et al.Coupled surfacesubsurface solute transport model for irrigation borders and basins.Ⅰ.Model development［J］.Journal of Irrigation and Drainage Engineering,2005,131(5):396-406.［5］Bradford S F,Katopodes N D.Nonhydrostatic model for surface irrigation［J］.Journal of Irrigation and Drainage Engineering,1998,124(4):200-212.［6］Shao Songdong,Lo Edmond Y M.Incompressible SPH method for simulating Newtonian and nonNewtonian flows with a free surface［J］.Advances in Water Resources,2003,26(7):787-800.［7］Bradford S F,Katopodes B F.Finite volume model for nonlevel basin irrigation［J］.Journal of Irrigation and Drainage Engineering,2001,127(4):216-223. |
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