Abstract

Quantification of infiltration characteristics of soil is a complex problem because of its variability, selection of suitable infiltration model, and determination of infiltration model parameters which depend on various soil characteristics and land uses. In this study four different infiltration models, namely, Horton, Kostiakov, Modified Kostiakov and Philip were considered. Infiltration experiments, using double-ring infiltrometer, were conducted to measure infiltration rate (f) on three different land covers viz. farmland, built-up and shrubland under the soil textures of clay and sandy clay in an urban sub-basin of lesser Himalayas, India. Predictability of infiltration models for different land covers under given soil textures was assessed by comparing field measured and model-predicted f. The performance of different infiltration models was assessed by computing different statistical indicators, and an overall performance index (OPI) was computed to rank the models. The Horton model was found to be the most suitable infiltration model with highest OPI values of 0.94 for different land covers under the soils of clay and sandy clay texture followed by Philip model. The results of this study will be useful for selecting suitable infiltration model for estimating infiltration rate in water balance modelling, and planning and management of water resources in the study area.

中文翻译：

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不同土地覆盖下入渗模型的比较评价

摘要

土壤入渗特征的量化是一个复杂的问题，因为其可变性、合适的入渗模型的选择以及入渗模型参数的确定取决于各种土壤特征和土地利用。在本研究中，考虑了四种不同的渗透模型，即 Horton、Kostiakov、Modified Kostiakov 和 Philip。使用双环渗透计进行渗透实验以测量三种不同土地覆盖的渗透率（f），即。印度小喜马拉雅山脉城市次盆地中粘土和砂质粘土土壤质地下的农田、建筑群和灌木地。通过比较现场测量和模型预测的f，评估给定土壤质地下不同土地覆盖的入渗模型的可预测性. 通过计算不同的统计指标来评估不同渗透模型的性能，并计算整体性能指数（OPI）对模型进行排序。发现 Horton 模型是最合适的入渗模型，对于粘土和砂质粘土质地的土壤下不同土地覆盖的 OPI 值最高，为 0.94，其次是 Philip 模型。本研究的结果将有助于选择合适的入渗模型来估算水平衡建模中的入渗率，以及研究区水资源的规划和管理。