Data associated with manuscript ("An Effective Medium Theory-Based Unified Model for Estimating Thermal Conductivity of Unfrozen and Frozen Soils") submitted to Catena

Datasets associated with manuscript “An Effective Medium Theory-Based Unified Model for Estimating Thermal Conductivity in Unfrozen and Frozen Soils” submitted to CatenaThe dataset includes two excel files. One is "optimized models for selected samples.xlsx", and the other is “trained unified & testing 3 models.xlsx”."optimized models for selected samples.xlsx": three soil samples with measurements were selected to present the ability of the unified model and existing models. These models were optimized to best fit the measurements.Columns:“measurement”: measured thermal conductivity;“ck2005”, “tian2016”, “gd2016”, “unified”: predicted thermal conductivities by the individual models;“fr_high”: high-conductivity fraction. It is liquid water content for unfrozen soils, and liquid and ice content for frozen soils.“trained unified & testing 3 models.xlsx”: the training dataset were first used to build the pedotransfer functions for three parameters of the unified model (results in sheets “training-unfrozen” and “training-frozen”). The testing dataset were then used to evaluate the three models (results in sheets “testing-unfrozen” and “testing-frozen”).Columns:“fr_cr”:the critical volume fraction;“ts”: the scaling exponent;“alpha”: the compensating factor;“volume water content”: initial water content at the onset of freezing;Units:measured temperature in [°C];dry bulk density in [kg m-3];porosity in [m3 m-3];volume water content in [m3 m-3];measured/predicted thermal conductivity in [Wm-1°C-1].本数据集关联于投稿至Catena期刊的论文《基于有效介质理论的非冻与冻土导热系数统一估算模型》（An Effective Medium Theory-Based Unified Model for Estimating Thermal Conductivity in Unfrozen and Frozen Soils）。数据集包含两个Excel文件，其一为optimized models for selected samples.xlsx（供选样本优化模型.xlsx），其二为trained unified & testing 3 models.xlsx（训练统一模型与测试三类模型.xlsx）。在optimized models for selected samples.xlsx中，选取了3组带有实测数据的土样，用于展示统一模型与现有模型的拟合性能，所有模型均经过优化以实现与实测数据的最优拟合。该文件的列字段包括：measurement（实测导热系数）；ck2005、tian2016、gd2016、unified（各单一模型预测得到的导热系数）；fr_high（高传导率组分占比，非冻土条件下为液态水含量，冻土条件下为液态水与冰的总含量）。在trained unified & testing 3 models.xlsx中，首先使用训练数据集构建统一模型三个参数对应的土壤传递函数（pedotransfer functions），训练结果分别存储于工作表"training-unfrozen"与"training-frozen"中；随后采用测试数据集对三类模型进行性能评估，测试结果存储于工作表"testing-unfrozen"与"testing-frozen"中。该文件的列字段包括：fr_cr（临界体积分数）；ts（缩放指数）；alpha（补偿因子）；volume water content（冻结起始时刻的初始体积含水率）。各物理量单位如下：实测温度：[°C]；干体积密度（dry bulk density）：[kg·m⁻³]；孔隙度：[m³·m⁻³]；体积含水率：[m³·m⁻³]；实测/预测导热系数：[W·m⁻¹·°C⁻¹]。