摘要
基于畦灌数值模拟试验设计,在考虑随机生成的畦面相对高程最小样本容量值的基础上,借助数值模拟手段分析微地形起伏幅度Sd及其相应的起伏位置空间分布差异对宽畦灌溉系统的影响,以评价微地形空间变异性对畦灌质量的作用。结果表明,微地形起伏幅度增大对水平畦灌性能的影响较为显著,它使平均深灌水深度明显增大,灌溉效率和灌水均匀度显著降低。另一方面,微地形起伏位置空间分布差异对水平畦灌性能的影响取决于相应的微地形起伏幅度,Sd≤4cm下的微地形起伏位置空间分布差异对畦灌性能影响的程度较小,而Sd>4cm后的影响程度逐渐增加。
The influences of microtopography undulation degree Sd and the discrepancy of undulation location distribution on horizontal border irrigation system were analyzed by using numerical experiments for evaluating the effect of microtopograhpy spatial variability on irrigation quality. The result shows that microtopography undulation degree obviously affects the irrigation performance. When Sd is larger, the average irrigation water depth increases and corresponding irrigation application efficiency as well as irrigation uniformity will be obviously reduced. The effect of discrepancy of undulation distribution on irrigation performance is dependent upon the microtopography undulation degree. When Sd is less than 4cm, this effect is relatively small; while Sd is more than 4cm, the influence degree will sharply increase.
出处
《水利学报》
EI
CSCD
北大核心
2007年第10期1194-1199,共6页
Journal of Hydraulic Engineering
基金
"十五"国家重大科技专项(863计划)课题(2002AA2Z2041)
关键词
微地形
空间变异性
水平畦田
灌溉系统
microtopography
undulation degree
spatial variability
horizontal border
irrigation system
作者简介
白美健（1974-），女，四川人，工程师，博士生，主要从事节水灌溉技术研究。E-mail：baimj@iwhr．com
