An improved method for determining Brooks-Corey model parameters from horizontal absorption
文献类型：SCI/SSCI论文
| 作者 | Ma D. H.; Zhang, J. B.; Lai, J. B.; Wang, Q. J. |
| 发表日期 | 2016 |
| 关键词 | Soil hydraulic properties Brooks-Corey model Horizontal absorption Approximate solution soil-water diffusivity step outflow experiments hydraulic-properties unsaturated soils retention curve organic-matter bulk-density stony soils infiltration equation |
| 英文摘要 | Low-cost, simple, rapid and accurate approaches for measuring soil hydraulic properties are of great importance in the application of hydrologic models of the vadose zone. A recently proposed method of constant-saturation absorption (MCSA) for determining Brooks-Corey (BC) model parameters is promising. However, this method has not been tested using experimental data. In this paper, measured soil-water diffusivity or soil-water retention curves (SWRCs) of 20 soil samples were used to test the reliability of MCSA. The results indicate that MCSA consistently estimated soil-water diffusivities by the Bruce and Klute method, but it substantially overestimated air-entry suctions (h(d)) and thereby soil suction. A new method (MCPA) is proposed herein to overcome the problems associated with MCSA. Using the improved method, estimated SWRCs are consistent with observation. With the estimated soil hydraulic parameters, HYDRUS-1D generated very accurate simulations of the cumulative absorption curves. Compared with direct or other indirect methods, MCPA is a more accurate, low-cost, and simple method, and it is especially useful for rapid determination of SWRC for soil-water movement simulations. However, if unsaturated soil-water diffusivity is of greater concern, our results also indicate that MCSA more accurately predicts this quantity and thus should be preferred. (C) 2015 Elsevier B.V. All rights reserved |
| 出处 | Geoderma |
| 卷 | 263 |
| 页 | 122-131 |
| 语种 | 英语 |
| ISSN号 | 0016-7061 |
| DOI标识 | 10.1016/j.geoderma.2015.09.007 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/43131]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Ma D. H.,Zhang, J. B.,Lai, J. B.,et al. An improved method for determining Brooks-Corey model parameters from horizontal absorption. 2016. |
入库方式： OAI收割
来源：地理科学与资源研究所
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