Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR026612 |
The role of subsurface flow on evapotranspiration: a global sensitivity analysis | |
Fadji Zaouna Maina; Erica R. Siirila‐; Woodburn | |
2020-06-07 | |
发表期刊 | Water Resources Research |
出版年 | 2020 |
英文摘要 | Water resources are impacted by water‐energy balance fluxes at the land surface, most notably evapotranspiration (ET ), the largest component of surface energy balance. While integrated hydrologic models show promise in quantifying the non‐linear dynamics at this interface, the model results are plagued by parametric uncertainties. Given the high computational demand of running multiple parameter spaces of these models, little is known about how these uncertainties propagate into land surface processes. In this work, we perform a global sensitivity analysis by computing Sobol and AMAE indices using a surrogate model constructed with a polynomial chaos expansion to assess the impacts of the subsurface physical properties on ET . We do so by modeling a semi‐synthetic test case. Our results show that the effects of vertical hydraulic conductivity, porosity, and the water retention curve parameter Van Genuchten α mainly control ET . However, we note that while evaporation (E ) shows behavior similar to the ET with high sensitivity to the parameters controlling the flow in the unsaturated zone, transpiration (T ) is very sensitive to the saturated zone parameters and groundwater flow, especially during periods without rain. Our results also show that heterogeneities in land cover impact the flow in the saturated zone. Furthermore, our work demonstrates that reduced‐order models can be developed to make integrated models more accessible for rigorous sensitivity analyses and calibration purposes. |
领域 | 资源环境 |
URL | 查看原文 |
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/273323 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Fadji Zaouna Maina,Erica R. Siirila‐,Woodburn. The role of subsurface flow on evapotranspiration: a global sensitivity analysis[J]. Water Resources Research,2020. |
APA | Fadji Zaouna Maina,Erica R. Siirila‐,&Woodburn.(2020).The role of subsurface flow on evapotranspiration: a global sensitivity analysis.Water Resources Research. |
MLA | Fadji Zaouna Maina,et al."The role of subsurface flow on evapotranspiration: a global sensitivity analysis".Water Resources Research (2020). |
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