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| 基于电渗与水力坡降的土壤VG模型参数率定 |
| Parameter calibration of the soil VG model based on electroosmosis and hydraulic gradient |
| 投稿时间：2025-04-27 修订日期：2025-06-25 |
| DOI： |
| 中文关键词: 电渗 水力坡降 VG模型 参数率定 水分特征曲线 |
| 英文关键词:Electroosmosis Hydraulic Gradient Soil VG Model Parameter calibration Soil Water characteristic curve |
| 基金项目:黑龙江省自然科学基金联合基金培育项目(PL2024E024) |
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| 中文摘要: |
| VG模型能够较好地表征土壤水分运移的滞留与传输特性，在土壤水分动态模拟、灌溉管理策略制定及土壤改良工程中有着广泛应用，但对于不同土壤类别，模型中的 a 和 n 两个参数的率定过程非常繁琐，影响了模型的推广应用。为了更高效确定土壤VG模型参数，本文提出了基于可控电渗试验系统一次性试验结果直接率定模型参数的方法，并以大庆地区土壤为例进行了具体试验并给出率定过程。结果表明：电渗试验可以直接在试验土体中形成多个水力坡降，根据试验获得的水分特征曲线与水力传导数据可以直接率定出VG模型中关键水力参数。研究证实，电渗作用可有效增强土壤中水分迁移效率，率定得到的VG模型参数精度较高。 |
| 英文摘要: |
| The Van Genuchten (VG) model has proven effective in describing the retention and transport characteristics associated with soil water movement. It has broad applications in soil moisture dynamics simulation, irrigation management strategies, and soil improvement projects. However, the calibration process of the parameters a and n in the model is very complex for different soil types, which limits the widespread application of the model. To more efficiently determine the soil VG model parameters, this study proposes a method for directly calibrating the model parameters based on a single experimental result from a controlled electroosmosis testing system. A specific experiment is conducted using saline-impacted soils from the Daqing region, and the calibration process is p?rovided. The results show that the electroosmosis experiment can generate multiple hydraulic gradients within the test soil. Based on the obtained soil moisture characteristic curve and hydraulic conductivity data, the key hydraulic parameters of the VG model can be directly calibrated. The study confirms that electroosmosis can effectively enhance the moisture migration efficiency within the soil, and the calibrated VG model parameters exhibit high accuracy. |
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