摘要
以杨凌地区为例,进行野外双环入渗试验研究,运用2种常用模型(Kostiakov模型和Philip模型)对土壤入渗参数进行模拟。在分析土壤特征参数,寻求适合区域尺度的最优入渗模型同时,对土壤的状态变量进行标定并研究标定系数的空间变异性,研究结果表明:Philip模型可作为区域最优入渗模型,土壤入渗特征参数存在明显的空间变异性,标定系数aA比as对模型参数的标定效果好,且在较大范围内存在一定的趋势性,有较好的预测效果。因此,可根据标定系数随机模拟得到某一具体时刻的土壤入渗量的空间分布,为定量分析土壤水分运动、研究土壤水分入渗的空间分布提供理论基础。
A total of 29 infiltration test sites were conducted over the area using double-ring infiltrometers, and the parameters of all the sites were simulated with two selected models （Kostiakov model ＆ Philip model）. Furthermore, the paper also analyzed infiltration characteristic parameters and explored the best infiltration model fitting for regional scale that was tested. At the same time, the cumulative infiltration was scaled and then spatial variation of α
A was approved. The results showed that the soil infiltration characteristic parameters had obvious spatial variation; the scaling achieved through αA was better than through αs, furthermore the aA had tendency to some extent and better in this region. Therefore the aA was used to scaled the soil characteristic parameters under similar soil texture, and analyzed quantitatively the movement of soil water, which provided guide for the macroscopical study on spatial distribution of soil water infiltration.
出处
《灌溉排水学报》
CSCD
北大核心
2009年第1期71-73,89,共4页
Journal of Irrigation and Drainage
基金
国家自然科学基金项目(50479052)
国家科技支撑计划项目(2006BAD11B04)
国家863计划项目(2006AA100209)
西北农林科技大学青年学术骨干计划资助课题
