Khaki M., Forootan E., Kuhn M., Awange J., Papa Fabrice, Shum C. K. (2018). A study of Bangladesh's sub-surface water storages using satellite products and data assimilation scheme. Science of the Total Environment, 625, p. 963-977. ISSN 0048-9697.
Titre du document
A study of Bangladesh's sub-surface water storages using satellite products and data assimilation scheme
Khaki M., Forootan E., Kuhn M., Awange J., Papa Fabrice, Shum C. K.
Source
Science of the Total Environment, 2018,
625, p. 963-977 ISSN 0048-9697
Climate change can significantly influence terrestrial water changes around the world particularly in places that have been proven to be more vulnerable such as Bangladesh. In the past few decades, climate impacts, together with those of excessive human water use have changed the country's water availability structure. In this study, we use multi-mission remotely sensed measurements along with a hydrological model to separately analyze groundwater and soil moisture variations for the period 2003-2013, and their interactions with rainfall in Bangladesh. To improve the model's estimates of water storages, terrestrial water storage (TWS) data obtained from the Gravity Recovery And Climate Experiment (GRACE) satellite mission are assimilated into the World-Wide Water Resources Assessment (W3RA) model using the ensemble-based sequential technique of the Square Root Analysis (SQRA) filter. We investigate the capability of the data assimilation approach to use a non-regional hydrological model for a regional case study. Based on these estimates, we investigate relationships between the model derived sub-surface water storage changes and remotely sensed precipitations, as well as altimetry-derived river level variations in Bangladesh by applying the empirical mode decomposition (EMD) method. A larger correlation is found between river level heights and rainfalls (78% on average) in comparison to groundwater storage variations and rainfalls (57% on average). The results indicate a significant decline in groundwater storage (similar to 32% reduction) for Bangladesh between 2003 and 2013, which is equivalent to an average rate of 8.73 +/- 2.45 mm/year.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
;
Hydrologie [062]
;
Télédétection [126]
