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中国沙漠  2015 

基于矩分析的垄沟灌入渗湿润体特征

DOI: 10.7522/j.issn.1000-694X.2014.00111

Keywords: 垄沟灌,入渗,湿润体,矩分析,HYDRUS-2D

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Abstract:

为指导垄沟灌溉技术参数的合理设计,利用验证的HYDRUS-2D模型模拟不同土壤物理性质、耕作技术参数和灌水技术参数组合的垄沟灌土壤水分入渗过程,采用空间矩分析方法定量分析不同因素对入渗湿润体特征量及椭圆特征值的影响。结果表明:矩分析垄沟灌溉入渗湿润体呈扁平椭圆状;初始含水量对湿润体特征量的影响较其它因素小;垄沟灌溉宜在质地重的土壤条件下应用;随沟底宽度和灌溉水深增大,椭圆面积亦增大,椭圆长短轴差异明显,显著加大水平侧渗距离,砂壤土宜窄沟种植,黏壤土宜宽沟灌溉种植,较高的灌溉水深可增加侧渗,有利于提高灌水均匀度。空间矩分析为研究土壤水空间分布特征提供了一种强有力数学方法。

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