Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR025963 |
Physical Constraints for Improved Soil Hydraulic Parameter Estimation by Pedotransfer Functions | |
Lehmann, Peter1; Bickel, Samuel1; Wei, Zhongwang2; Or, Dani1,3 | |
2020-04-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2020 |
卷号 | 56期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | Switzerland; Peoples R China; USA |
英文摘要 | Global land surface models use spatially distributed soil information for the parameterization of soil hydraulic properties (SHP). Parameters of measured SHP are correlated with easy-to-measure soil properties to construct general pedotransfer functions (PTFs) used to predict SHP from spatial soil information. Global PTFs are based on a limited number of samples yielding highly variable and poorly constrained SHP. The study implements a physical constraint, soil-specific capillary length, to reduce unphysical combinations of SHP. The procedure fits concurrently soil water retention and capillary length using the same parameters. Results suggest that meeting the capillary length constraint has minor effects on the goodness of fit to soil water retention data. Constrained SHP were applied to represent 4 years of lysimeter fluxes yielding evapotranspiration values in close agreement with measurements relative to slight overestimation by unconstrained SHP. The procedure was applied for testing constraint SHP at a regional scale in New Zealand using the surface evaporation capacitance model and Noah-MP for detailed simulations of land surface processes. The use of constrained SHP in both models yields higher surface runoff in agreement with observations (unconstrained SHP severely underestimated runoff generation). The concept of constrained SHP could be extended to include other physical constraints to improve PTFs, for example, by consideration of vegetation cover and soil structure effects on infiltration. Key Points Land surface models use spatially distributed soil hydraulic properties that may not honor constraints of capillary flow length Physically constrained soil hydraulic properties were obtained by fitting soil water characteristics and capillary length simultaneously Simulation results with physically constrained parameter values can improve predictive power of hydraulic and climatic models |
英文关键词 | pedotransfer function characteristic length soil hydraulic properties soil water characteristics |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000538987800039 |
WOS关键词 | EVAPORATION ; DISTRIBUTIONS ; CONDUCTIVITY ; ALBEDO ; MODEL |
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/280630 |
专题 | 资源环境科学 |
作者单位 | 1.Swiss Fed Inst Technol, Soil & Terr Environm Phys, Dept Environm Syst Sci, Zurich, Switzerland; 2.Sun Yat Sen Univ, Southern Marine Sci & Engn Guangdong Lab Zhuhai, Guangdong Prov Key Lab Climate Change & Nat Disas, Sch Atmospher Sci, Guangzhou, Peoples R China; 3.Desert Res Inst, Div Hydrol Sci, Reno, NV USA |
推荐引用方式 GB/T 7714 | Lehmann, Peter,Bickel, Samuel,Wei, Zhongwang,et al. Physical Constraints for Improved Soil Hydraulic Parameter Estimation by Pedotransfer Functions[J]. WATER RESOURCES RESEARCH,2020,56(4). |
APA | Lehmann, Peter,Bickel, Samuel,Wei, Zhongwang,&Or, Dani.(2020).Physical Constraints for Improved Soil Hydraulic Parameter Estimation by Pedotransfer Functions.WATER RESOURCES RESEARCH,56(4). |
MLA | Lehmann, Peter,et al."Physical Constraints for Improved Soil Hydraulic Parameter Estimation by Pedotransfer Functions".WATER RESOURCES RESEARCH 56.4(2020). |
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