畦灌灌水效果对土壤入渗参数的敏感性研究

发布时间：2018-08-25 16:28

【摘要】：为分析不同土壤入渗能力下的畦灌灌水效果差异,以汾东灌区北长寿试验点的灌水试验为依托,建立灌水技术参数优化模型对灌区的灌水条件进行优化。在优化灌水条件下,选用修正后的Kostiakov入渗模型,以土壤水分入渗参数k、a和f0为自变量,通过正交试验的方法,利用Win SRFR软件对灌水效果指标灌水效率Ea、灌水均匀度Du进行模拟,并对模拟结果进行方差和贡献率分析,结果表明:对于指标E_a和D_u,入渗参数影响显著,其贡献率由大到小均为ρ(k)ρ(f_0)ρ(a)。在此基础上,结合灌水效果指标对各入渗参数变异的敏感系数,确定了入渗参数k、a和f0综合变异时灌水效果指标偏离程度的量化形式,为土壤入渗能力空间变异时灌水效果指标精度控制提供依据。
[Abstract]:In order to analyze the difference of border irrigation effect under different soil infiltration capacity, based on the irrigation experiment of north longevity test site in Fendong Irrigation District, an optimized model of irrigation technical parameters was established to optimize irrigation conditions in irrigation area. Under the optimized irrigation condition, the modified Kostiakov infiltration model was selected, and the soil water infiltration parameters KPA and f0 were taken as independent variables. By means of orthogonal test, the Ea, irrigation uniformity was simulated by Win SRFR software. The variance and contribution rate of the simulation results are analyzed. The results show that the infiltration parameters have a significant effect on the indexes Estua and DU, the contribution rate of which is 蟻 (k) 蟻 (fSt0) 蟻 (a). From large to small. On this basis, combining with the sensitivity coefficient of irrigation effect index to the variation of each infiltration parameter, the quantitative form of deviation degree of irrigation effect index was determined when the infiltration parameter KPA and f0 were varied synthetically. It provides the basis for precision control of irrigation effect index when soil infiltration capacity varies in space.
【作者单位】：太原理工大学水利科学与工程学院;
【基金】：国家自然科学基金资助项目(40671081) 山西省科技攻关项目(20100311124)
【分类号】：S152.72;S275.3

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