Bias-aware data assimilation in integrated hydrological modelling

Publikation: Bidrag til tidsskriftTidsskriftartikelfagfællebedømt

One of the major challenges in hydrological data assimilation applications is the presence of bias in both models and observations. The present study uses the ensemble transform Kalman filtering (ETKF) method and an observational bias estimation technique to estimate groundwater hydraulic heads. The study was carried out in a relatively complex, groundwater dominated, catchment in Denmark using the MIKE SHE model code. The method is implemented and evaluated using synthetic data and subsequently tested against real observations. The results from the synthetic experiments show that the bias-aware filter outperforms the standard filter, with improved state estimate and correct bias estimate. The assimilation using real observations further demonstrates the robustness of bias-aware ETKF, and the potential improvements using integrated hydrological modelling. Furthermore, the experiments with assimilating over different depths show that the state estimates depend on correlation across layers.
OriginalsprogEngelsk
TidsskriftHydrology Research
Vol/bind49
Udgave nummer4
Sider (fra-til)989-1004
Antal sider16
ISSN0029-1277
DOI
StatusUdgivet - 2018

ID: 197004817