Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR025772 |
The Moving-Boundary Approach for Modeling 2-D Gravity-Driven Stable and Unstable Flow in Partially Wettable Soils | |
Brindt, Naaran; Wallach, Rony | |
2020-05-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2020 |
卷号 | 56期号:5 |
文章类型 | Article |
语种 | 英语 |
国家 | Israel |
英文摘要 | The moving-boundary approach, which has been successfully used to model stable and unstable 1-D flow in initially dry soils of various contact angles (Brindt & Wallach, 2017 ), was extended here for 2-D flow. The wetting front is the plume perimeter that is partly formed by the capillary driving force, the remaining part by the combined capillary and gravity driving forces. The moving-boundary approach overcomes the limitation of the Richards equation for describing gravity-driven unstable flow with nonmonotonic water-content distribution. According to this approach, the 2-D flow domain is divided into two subdomains with a sharp change in fluid saturation between them-the wetting front (moving boundary). The 2-D Richards equation was solved for the subdomain behind the wetting front for a given flux boundary condition at the soil surface, while the location of the other boundary, for which a no-flux condition is imposed, was part of the solution. The moving-boundary solution was used after verification to demonstrate the synergistic effect of contact angle and incoming flux on flow stability and its associated plume shapes. The contact angle that hinders spontaneous invasion of the dry pores decreases the water-entry capillary pressure, psi(we), while the flux-dependent dynamic water-entry value, psi(wed), is even lower, both inducing water accumulation behind the wetting front (saturation overshoot). This innovative physically based model for the 2-D unsaturated flow problem for an initially dry soil of zero and nonzero contact angle using the moving-boundary approach fulfills several criteria raised by researchers to adequately describe gravity-driven unstable flow. |
英文关键词 | gravity-induced fingering dynamic water entry value preferential flow subcritical water repellency saturation overshoot unstable flow modeling |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000537736400040 |
WOS关键词 | WETTING FRONT INSTABILITY ; DYNAMIC CAPILLARY-PRESSURE ; UNSATURATED POROUS-MEDIA ; CONTACT-ANGLE ; STABILITY ANALYSIS ; FINGERED FLOW ; SATURATION OVERSHOOT ; PREFERENTIAL FLOW ; WATER-MOVEMENT ; INFILTRATION |
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/280667 |
专题 | 资源环境科学 |
作者单位 | Hebrew Univ Jerusalem, RH Smith Fac Agr Food & Environm, Dept Soil & Water Sci, Rehovot, Israel |
推荐引用方式 GB/T 7714 | Brindt, Naaran,Wallach, Rony. The Moving-Boundary Approach for Modeling 2-D Gravity-Driven Stable and Unstable Flow in Partially Wettable Soils[J]. WATER RESOURCES RESEARCH,2020,56(5). |
APA | Brindt, Naaran,&Wallach, Rony.(2020).The Moving-Boundary Approach for Modeling 2-D Gravity-Driven Stable and Unstable Flow in Partially Wettable Soils.WATER RESOURCES RESEARCH,56(5). |
MLA | Brindt, Naaran,et al."The Moving-Boundary Approach for Modeling 2-D Gravity-Driven Stable and Unstable Flow in Partially Wettable Soils".WATER RESOURCES RESEARCH 56.5(2020). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论