Parameterization of theeffective properties as input in hydrogeological models for simulating water flow is a time consuming and costly process, and it is characterized by high uncertainty because of the spatial variability of soil properties. Integrating visible−near-infrared spectroscopy (vis−NIRS) models and a developed pedotransfer function, a hydrogeological tool was suggested by Varvaris et al. in 2019 for estimating the hydraulic properties used in an equilibrium approach. In the current study, the proposed concept was further expanded for assisting on a rapid and inexpensive parameterization of effective parameters in nonequilibrium models. In our approach, the soil-water retention curves for the wet and hyper-dry ends were predicted using existing vis−NIRS calibration models for obtaining the parameters for the Campbell retention model and the Campbell and Shiozawa model, respectively. The HYDRUS-2D software package was used to simulate tile drainage discharge in a loamy structured field using as initial input hydraulic parameters the output from the suggested concept. The estimated parameters were validated based on measured hydraulic properties in the laboratory. Two-dimensional models incorporating nonequilibrium flow were used to evaluate the ability of each approach to predict the tile drainage discharge: a single-porosity with modified van Genuchten function, a dual-porosity model, and a dual-permeability model. All approaches gave a fairly good fit to the hydrograph features for both calibration and validation datasets with dual-porosity to present the highest predictive ability. Finally, the suggested initial parameterization concept proved its potential to be used as an alternative for covering the absence of measured data of soil hydraulic properties.

中文翻译：

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HYDRUS-2D 中二维方法的参数化：第 1 部分。模拟现场规模的水流动力学

将有效特性参数化作为模拟水流的水文地质模型的输入是一个耗时且成本高昂的过程，并且由于土壤特性的空间可变性而具有高度不确定性。Varvaris 等人提出了一种将可见光-近红外光谱 (vis-NIRS) 模型和开发的土壤传递函数相结合的水文地质工具。2019 年用于估计平衡方法中使用的水力特性。在当前的研究中，进一步扩展了所提出的概念，以帮助对非平衡模型中的有效参数进行快速且廉价的参数化。在我们的方法中，使用现有的 vis-NIRS 校准模型预测湿端和超干端的土壤保水曲线，分别获得 Campbell 保水模型和 Campbell 和 Shiozawa 模型的参数。使用 HYDRUS-2D 软件包，将建议概念的输出作为初始输入水力参数，模拟壤土结构领域中的瓷砖排水排放。根据在实验室中测量的水力特性来验证估计的参数。使用包含非平衡流的二维模型来评估每种方法预测瓷砖排水流量的能力：具有修正 van Genuchten 函数的单孔隙度、双孔隙度模型和双渗透率模型。所有方法都非常适合具有双孔隙度的校准和验证数据集的水文特征，以呈现最高的预测能力。最后，建议的初始参数化概念证明了它有潜力用作替代土壤水力特性测量数据的替代方法。