METHOD FOR OBTAINING ANISOTROPIC FURROWED FIELD SURFACE ROUGHNESS COEFFICIENT AND APPLICATION THEREOF

摘要

A method for obtaining an anisotropic furrowed field surface roughness coefficient, comprising: preselecting two elongate experimental fields (2, 3) which are respectively parallel to the lengthwise direction and the widthwise direction of a target furrowed field (1), and respectively obtaining surface water advance process data of the two elongate experimental fields (2, 3); respectively obtaining two isotropic furrowed field surface roughness coefficients according to the surface water advance process data by using a one-dimensional hydrodynamic furrow irrigation model; putting the isotropic furrowed field surface roughness coefficients into an ellipse equation the anisotropic furrowed field surface roughness coefficients satisfy, so as to obtain an anisotropic furrowed field surface roughness coefficient of the target furrowed field (1), wherein the anisotropic furrowed field surface roughness coefficient comprises furrowed field surface roughness coefficient components that are respectively parallel and vertical to a shallow channel on a furrowed field surface of the target furrowed field (1) and a crop planting direction. Also disclosed is an application of an anisotropic furrowed field surface roughness coefficient in a surface irrigation process. The anisotropic furrowed field surface roughness coefficient can truly reflect the resistant effect of a furrowed field surface on water flows, and can help improve the simulation accuracy of surface irrigation hydrodynamics, thereby obtaining a more accurate irrigation performance index.