The transient analysis of mini disc infiltrometer (MDI) measurements is an established method for characterising near-surface hydraulic characteristics of soils. The reliability of hydraulic characteristics obtained from transient analysis depends on the (1) adequacy of model, (2) adequacy of data, (3) measurement time and (4) measurement footprint. The measurement time dependence recommendations are reported only for a few soil textures, initially wet samples and tension infiltrometer (TI) with a higher measurement footprint than the MDI. This study investigated the adequacy of infiltration data (using cumulative linearization [CL] and differentiated linearization [DL]) and measurement time influence on the hydraulic parameters determined from the transient analysis of MDI measurements for six soil textures. The objective of the study is to identify suitable MDI measurement durations for different soil textures for the initially dry state, considering both adequacy of data and time fractionation (measurement time influence). The data adequacy time obtained from the DL (T_DL) was found to be 0.8 times less than the value obtained from CL (T_CL). The marginal difference in T_DL and T_CL had a significant influence on the determination of infiltration equation coefficient C₁ and negligible influence on coefficient C₂. The time fractionation procedure adopted for identifying adequate MDI measurement time (T_m) was found to be comparable based on sorptivity (S₀) and hydraulic conductivity (K₀). The average T_m was also comparable with T_DL and T_CL with a strong positive correlation. The C₂ values obtained based on T_m, T_DL, and T_CL were in better agreement than the corresponding C₁ values. The adequate MDI measurement times identified by considering T_m, T_DL, and T_CL were texture dependent, ranging from 45 min for silt to 120 min for silt loam and silty clay loam. For loamy sand, it was 50 min; for sand, it was 70 min, followed by 60 min for loam.

中文翻译：

---

微型圆盘入渗仪测量瞬态分析中水力参数估计的时间依赖性

微型圆盘入渗仪 (MDI) 测量的瞬态分析是表征土壤近地表水力特性的既定方法。从瞬态分析中获得的水力特性的可靠性取决于（1）模型的充分性，（2）数据的充分性，（3）测量时间和（4）测量足迹。仅针对少数土壤质地、初始湿样品和张力入渗仪 (TI) 报告了测量时间依赖性建议，其测量足迹高于 MDI。本研究调查了入渗数据的充分性（使用累积线性化 [CL] 和微分线性化 [DL]）和测量时间对通过对六种土壤质地的 MDI 测量的瞬态分析确定的水力参数的影响。该研究的目的是确定初始干燥状态下不同土壤质地的合适 MDI 测量持续时间，同时考虑数据的充分性和时间分级（测量时间影响）。从 DL 获得的数据充足时间 (发现T _{DL ) 比从 CL (} T _CL )获得的值小 0.8 倍。T _DL和T _CL的边际差异对入渗方程系数C ₁的确定有显着影响，对系数C ₂的影响可以忽略不计。发现用于确定足够 MDI 测量时间 ( T _{m ) 的时间分级程序在吸附性 (} S ₀ ) 和水力传导率 ( K ₀ )方面具有可比性。平均T _m也与T _DL与T _CL呈强正相关。基于T _m、T _DL和T _CL获得的C ₂值比相应的C ₁值更一致。通过考虑T _m、T _DL和T _CL确定的适当 MDI 测量时间取决于质地，从粉砂的 45 分钟到粉砂壤土和粉质粘土的 120 分钟不等。壤质沙为 50 分钟；沙子为 70 分钟，随后为 60 分钟为壤土。