| Study on influence of field surface slope on irrigation efficiency in combination with different irrigation parameters |
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| DOI：10.7606/j.issn.1000-7601.2011.06.08 |
| Key Words: border irrigation irrigation efficiency field suface slope flux per width land roughness |
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| Abstract: |
| As field suface slope is an important factor which influences irmigation efficiency in border irrigation, it
is necessary to study its influence on irmigation capability in combination with irrigation quota， land leveling precision，land roughness and flux per width. Irigation simulation in different irigation factors by general technical level off border indicates: different irrigation quota， land leveling precision，land roughness and flux per width are corresponding to different optimum field suface slop，optimization slopes are 1.6‰，1.8‰ and 2.2‰ by reverse simulation when irrigation quota is 60mm，land leveling precision is 4.25 cm，land roughness is 0.12 and flux per width are respectively 4 L/(s·m)，3L/(s·m) and 2 L/(s·m). The study of water flux advance and regression process in different field suface slopes concludes that the curve of water flux advance and regression of process field suface slopes in 2.0‰ is more smooth than in 1. 6%oo and 1. 2‰，indicating that water flux advance in relatively larger field suface slope is stable and and is favorable for the improvement of irrigation quality in smaller flux per width. |