浙江农业学报

• 环境科学 • 上一篇    下一篇

一种改进的土壤水分特征曲线模型及其验证

  

  1. (1 安庆师范学院 环境工程系,安徽 安庆 246011;2 安徽省地矿局326地质队, 安徽 西庆 246003; 3 中国科学院 南京地理与湖泊研究所,江苏 南京 210008)
  • 出版日期:2015-05-25 发布日期:2015-05-19

An improved model for prediction of soil water retention properties and its validation

  1. (1 Department of Environmental Engineering, Anqing Normal University, Anqing 246011, China; 2 The 326 Geological Team, Bureau of Geology and Uineral Exploration of Anhui Province, Anqing 246003, China; 3 Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China)
  • Online:2015-05-25 Published:2015-05-19

摘要: 土壤水分特征曲线是土壤水分与溶质运移模型必需的输入参数。本文在传统的van Genuchten模型和Campbell模型的基础上,提出了一种基于自适应权重的土壤水分特征曲线改进模型。 验证发现,改进模型适用性更强,且能获得更好的模拟效果。特别是,改进模型为一个连续可微函数,能够满足非饱和土壤水流Richards方程数值求解的前提,因而具有较大的推广应用潜力。

关键词: 土壤水分特征曲线, 土壤质地, 模型, 自适应权重

Abstract: Soil water retention curve is an essential input parameter of soil water and solute transport model. According to the conventional van Genuchten model and Campbell model, an improved model of soil water retention curve was presented based on adaptive weight. The case study showed that the improved model was more adaptable, and could yield better simulation results. In particular, the improved model as a continuously differentiable function can satisfy the premise of the numerical solution of the Richards equation. So, the improved model was of great application potential.

Key words: soil water retention curve (SWRC), soil texture, model, adaptive weight