GSTDTAP  > 资源环境科学
DOI10.1029/2018WR023434
Sensitivity of Global Hydrological Simulations to Groundwater Capillary Flux Parameterizations
Koirala, Sujan1; Kim, Hyungjun2; Hirabayashi, Yukiko3; Kanae, Shinjiro4; Oki, Taikan2,5
2019
发表期刊WATER RESOURCES RESEARCH
ISSN0043-1397
EISSN1944-7973
出版年2019
卷号55期号:1页码:402-425
文章类型Article
语种英语
国家Germany; Japan
英文摘要

Global land surface and hydrologic models, used to quantify the influence of groundwater (GW) dynamics on land surface hydrology, vary in parameterizations of the GW capillary flux and depth of moisture flux exchange between GW and unsaturated soil column (interaction depth). In this study, we demonstrate that the parameterization of capillary flux significantly affects the magnitude of GW-supported ET (15%) and GW recharge (25%). The largest sensitivities are associated with a strong dependence of the capillary flux parameterization on water table depth (WTD) with further controls by soil hydraulic properties. Under shallow WTD condition, the finer soils show a larger GW-supported ET for parameterization that depends only on WTD. Further, GW-supported ET reduces by 7-13% per meter increase in interaction depth used in simulation compared to simulation in which the interaction depth varies in space and time with WTD. The simulations of runoff, soil moisture, and WTD are even more sensitive to the difference in parameterization and interaction depth. Moreover, these sensitivities vary largely in both space and time. Evaluations against observation-based data and previous modeling simulations reveal that simulations with capillary flux perform better than that the one without it in regions with large GW-supported ET. We concur that capillary flux has a large and nonnegligible influence in global hydrologic simulation. But, the spatiotemporal variabilities of sensitivities of hydrological fluxes and storages demonstrate that different parameterization of GW capillary flux may also lead to a substantial uncertainty in global hydrologic simulations and subsequent water resources assessments.


英文关键词global groundwater hydrology capillary flux groundwater recharge uncertainties groundwater resources
领域资源环境
收录类别SCI-E
WOS记录号WOS:000459536500023
WOS关键词WATER-TABLE DYNAMICS ; LAND-SURFACE SCHEME ; SOIL-MOISTURE ; MODEL ; EVAPOTRANSPIRATION ; REPRESENTATION ; CLIMATE ; VARIABILITY ; VEGETATION ; PATTERNS
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/21594
专题资源环境科学
作者单位1.Max Planck Inst Biogeochem, Dept Biogeochem Integrat, Jena, Germany;
2.Univ Tokyo, Dept Civil Engn, Inst Ind Sci, Tokyo, Japan;
3.Shibaura Inst Technol, Dept Civil Engn, Tokyo, Japan;
4.Tokyo Inst Technol, Dept Civil Engn, Tokyo, Japan;
5.United Nations Univ, Tokyo, Japan
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GB/T 7714
Koirala, Sujan,Kim, Hyungjun,Hirabayashi, Yukiko,et al. Sensitivity of Global Hydrological Simulations to Groundwater Capillary Flux Parameterizations[J]. WATER RESOURCES RESEARCH,2019,55(1):402-425.
APA Koirala, Sujan,Kim, Hyungjun,Hirabayashi, Yukiko,Kanae, Shinjiro,&Oki, Taikan.(2019).Sensitivity of Global Hydrological Simulations to Groundwater Capillary Flux Parameterizations.WATER RESOURCES RESEARCH,55(1),402-425.
MLA Koirala, Sujan,et al."Sensitivity of Global Hydrological Simulations to Groundwater Capillary Flux Parameterizations".WATER RESOURCES RESEARCH 55.1(2019):402-425.
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