Modeling microtopography in basin irrigation

被引:40
作者
Playan, E
Faci, JM
Serreta, A
机构
[1] CSIC, SERV INVEST AGROALIMENTARIA, LAB AGRON & MED AMBIENTE,DGA, UNIDAD SUELOS & RIEGOS, E-50080 ZARAGOZA, SPAIN
[2] UNIV ZARAGOZA, EUPH, DEPT INGN DISENO & FABRICAC, E-22071 HUESCA, SPAIN
关键词
D O I
10.1061/(ASCE)0733-9437(1996)122:6(339)
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
Microtopography has long been regarded as a key variable affecting basin irrigation performance. This paper reports on the extension of a flat bed two-dimensional basin irrigation model to the simulation of irrigation events in basins with microtopography. The model incorporates the local surface slopes in the x and y directions to the governing set of partial differential equations. Three field experiments were used to validate the extended model. Elevation was measured over irregular grids, and geostatistical techniques were applied to estimate the nodal elevation of the computational grids. Results indicate that inclusion of microtopography improves the estimation of the advance and recession processes and produces lower, more realistic estimates of irrigation performance. To further explore this phenomenon, two numerical experiments were devised consisting of a series of simulations on a level basin with gradually growing microtopography. The times of advance and recession and the irrigation performance indexes are significantly affected by field microtopography, even if laser leveling is used.
引用
收藏
页码:339 / 347
页数:9
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