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DOI | 10.1029/2018WR024288 |
Capillary Length and Field Capacity in Draining Soil Profiles | |
Aldrees, A.1,2; Nachabe, M.1 | |
2019-05-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2019 |
卷号 | 55期号:5页码:4499-4507 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Saudi Arabia |
英文摘要 | The capillary length (lambda(s)) and time (t(s)) are dynamic scalars that emerge routinely in the infiltration problem when gravitational and pressure gradients forces are involved. During drainage, however, capillary gradients oppose gravity and retain soil moisture close to surface. In this case, the pull of capillary gradients increases with drainage time and offsets gravity resulting in a quasi-hydrostatic pressure distribution and negligibly small drainage flux in the profile. In this paper, it is proposed to anchor the dynamic concept of field capacity-the attainment of a small negligible drainage flux-in the physics of soil moisture redistribution as influenced by gravity and capillary forces. Similar to infiltration, this dynamic approach grounds the concept of field capacity in soil hydrology and allows its estimation from readily measured intrinsic physical characteristics such as lambda(s),t(s), andK(s). Finally, we exploit an analytical solution by Broadbridge and White (1988, ) to track the drainage front as soil water redistributes in an initially saturated soil profile. While initially large, the downward migrating drainage front decelerates with time reaching near steady state condition at t approximate to 1,000t(s). Quasi-hydrostatic pressure matric head and water content profiles develop above the drainage front. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000474848500049 |
WOS关键词 | RATE RAINFALL INFILTRATION ; VERSATILE NONLINEAR MODEL ; HYDRAULIC CONDUCTIVITY ; PARAMETER EQUIVALENCE ; DRAINAGE ; EQUATION |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/183157 |
专题 | 资源环境科学 |
作者单位 | 1.Univ S Florida, Dept Civil & Environm Engn, Tampa, FL 33612 USA; 2.Prince Sattam Bin Abdulaziz Univ, Dept Civil Engn, Alkharj, Saudi Arabia |
推荐引用方式 GB/T 7714 | Aldrees, A.,Nachabe, M.. Capillary Length and Field Capacity in Draining Soil Profiles[J]. WATER RESOURCES RESEARCH,2019,55(5):4499-4507. |
APA | Aldrees, A.,&Nachabe, M..(2019).Capillary Length and Field Capacity in Draining Soil Profiles.WATER RESOURCES RESEARCH,55(5),4499-4507. |
MLA | Aldrees, A.,et al."Capillary Length and Field Capacity in Draining Soil Profiles".WATER RESOURCES RESEARCH 55.5(2019):4499-4507. |
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