Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR025368 |
Modeling Variably Saturated Flow in Stratified Soils With Explicit Tracking of Wetting Front and Water Table Locations | |
Dai, Yongjiu1,2; Zhang, Shupeng1,2; Yuan, Hua1,2; Wei, Nan1,2 | |
2019-10-10 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2019 |
文章类型 | Article;Early Access |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | The locations of wetting front and water table are key variables in an integrated surface-groundwater modeling. In current land surface models, they are either diagnosed from pressure head profiles or predicted using certain parameterization schemes. Both approaches need to make assumptions on how pressure head changes vertically and numerical results may have large errors when these assumptions are violated. In this work, we propose a numerical framework, which can explicitly track the locations of wetting front and water table. Existing numerical solvers modeling soil water movement usually use water content, pressure head, or both of them as prognostic variables, while in this framework, two additional prognostic variables representing the locations of wetting front and water table are introduced. Besides, another two improvements are explored to make the framework stable and efficient. First, a new equivalent hydraulic conductivity formula accommodating nonlinear hydraulic curves is proposed. The formula is unconditionally stable and can yield oscillation-free solution of Richards' equation in unsaturated homogeneous soils. Second, a mixed implicit-explicit temporal discretization is adopted. It uses an implicit scheme initially at every time step to improve the stability and accuracy, while in case of failure in convergence it replaces the iterations with an explicit scheme to guarantee mass conservation. Based on all these improvements, the framework is potentially used to simulate variably saturated flow in stratified soils in land surface models. Seven numerical tests covering various flow situations, boundary conditions, and soil geometries are carried out and illustrate the characteristics of the proposed framework. |
英文关键词 | soil water Richards' equation variably saturated flow model stratified soils explicit tracking of wetting front and water table locations |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000489372600001 |
WOS关键词 | RICHARDS EQUATION ; HYDRAULIC CONDUCTIVITY ; NUMERICAL-SOLUTION ; LAND-SURFACE ; GROUNDWATER-FLOW ; INFILTRATION ; TRANSPORT ; FORM |
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/187618 |
专题 | 资源环境科学 |
作者单位 | 1.Sun Yat Sen Univ, Guangdong Prov Key Lab Climate Change & Nat Disas, Southem Marine Sci & Engn Guangdong Lab Zhuhai, Guangzhou, Guangdong, Peoples R China; 2.Sun Yat Sen Univ, Sch Atmospher Sci, Guangzhou, Guangdong, Peoples R China |
推荐引用方式 GB/T 7714 | Dai, Yongjiu,Zhang, Shupeng,Yuan, Hua,et al. Modeling Variably Saturated Flow in Stratified Soils With Explicit Tracking of Wetting Front and Water Table Locations[J]. WATER RESOURCES RESEARCH,2019. |
APA | Dai, Yongjiu,Zhang, Shupeng,Yuan, Hua,&Wei, Nan.(2019).Modeling Variably Saturated Flow in Stratified Soils With Explicit Tracking of Wetting Front and Water Table Locations.WATER RESOURCES RESEARCH. |
MLA | Dai, Yongjiu,et al."Modeling Variably Saturated Flow in Stratified Soils With Explicit Tracking of Wetting Front and Water Table Locations".WATER RESOURCES RESEARCH (2019). |
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