Preconditioning an ensemble Kalman filter for groundwater flow using environmental-tracer observations
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- 作者：Daniel Erdal ; daniel.erdal@uni-tuebingen.de ; Olaf A. Cirpka
- 关键词：Data assimilation of hydraulic heads ; Ensemble Kalman filter ; Kalman ensemble generator ; Groundwater-age tracers ; Phreatic aquifer ; Groundwater recharge ; Hydraulic conductivity ; Specific yield
- 刊名：Journal of Hydrology
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：545
- 期：Complete
- 页码：42-54
- 全文大小：2677 K
- 卷排序：545
文摘
We estimate hydraulic conductivity and temporally variable groundwater recharge. A highly variable initial ensemble is considered within an EnKF framework. EnKF can well estimate temporally variable recharge if ensemble size is large. If the initial ensemble is preconditioned, smaller ensemble sizes can be used. Preconditioning using groundwater-age tracer observations.