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首页> 外文期刊>Journal of Agricultural Engineering >Comparison of different estimation procedures for the hydraulic properties of horticultural substrates by One-Step technique
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Comparison of different estimation procedures for the hydraulic properties of horticultural substrates by One-Step technique

机译：一步法比较园艺基质水硬性的不同估算程序

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The improved iterative method for the simultaneous determination of the hydraulic properties of growing media from One-Step experiment by Bibbiani, is performed and compared with simplified equations by Valiantzas and Londra. Brooks and Corey equation for water retention, and Kozeny power equation for hydraulic conductivity characterized the hydraulic properties of the porous media. The iterative procedure is applied on pure peat, pumice, and their mixes. The One- Step method has been previously optimized: processing the mean cumulative outflow curves recorded versus time, an estimation of diffusivity, and therefore of the hydraulic functions, is derived. Estimated water retention curve is compared with nine experimental data, and with the estimation of the Van Genuchten model, via the RETC code. Bibbiani’s and Van Genuchten’s models overlap except for the “very wet” range near saturation, whereas the Valiantzas and Londra’s procedure didn’t get satisfactory results. In regard to diffusivity, a good similarity between Bibbiani’s and Van Genuchten-Mualem’s curves can be assessed, while Valiantzas and Londra’s procedure generally results in higher values. Due to the lack of estimation of the water retention curve, Valiantzas and Londra’s procedure fails to estimate the hydraulic conductivity function, whereas Bibbiani’s and Van Genuchten-Mualem’s curves match together in most cases.
机译：进行了改进的迭代方法，该方法可同时由Bibbiani通过一步实验确定生长介质的水力特性，并与Valiantzas和Londra的简化方程进行比较。用于保水的Brooks和Corey方程，以及用于水力传导率的Kozeny功率方程描述了多孔介质的水力特性。迭代过程适用于纯泥炭，浮石及其混合物。一步法以前已经过优化：处理记录的平均累积流出曲线与时间的关系，得出扩散率的估计值，从而得出水力函数的估计值。通过RETC代码，将估计的保水曲线与9个实验数据以及Van Genuchten模型的估计进行比较。 Bibbiani和Van Genuchten的模型重叠，除了“非常潮湿”的范围接近饱和之外，而Valiantzas和Londra的过程未获得令人满意的结果。关于扩散率，可以评估Bibbiani曲线与Van Genuchten-Mualem曲线之间的良好相似性，而Valiantzas和Londra的方法通常会得出更高的值。由于缺乏保水曲线的估算，Valiantzas和Londra的方法无法估算水力传导率函数，而在大多数情况下，Bibbiani曲线和Van Genuchten-Mualem的曲线匹配在一起。

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