DOI: 10.5194/hess-21-2053-2017
Scopus记录号: 2-s2.0-85018493477
论文题名: Improving estimates of water resources in a semi-arid region by assimilating GRACE data into the PCR-GLOBWB hydrological model
作者: Tangdamrongsub N ; , Steele-Dunne S ; C ; , Gunter B ; C ; , Ditmar P ; G ; , Sutanudjaja E ; H ; , Sun Y ; , Xia T ; , Wang Z
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 4 起始页码: 2053
结束页码: 2074
语种: 英语
Scopus关键词: Agriculture
; Arid regions
; Climate models
; Covariance matrix
; Digital storage
; Errors
; Geodetic satellites
; Groundwater
; Groundwater resources
; Hydrology
; Meteorology
; Soil moisture
; Uncertainty analysis
; Water conservation
; Agricultural activities
; Ensemble Kalman Filter
; Gravity recovery and climate experiment datum
; Groundwater consumption
; Groundwater depletion
; Hydrological modeling
; Spatial and temporal resolutions
; Terrestrial water storage
; Water resources
; data assimilation
; error analysis
; GRACE
; groundwater
; hydrological modeling
; Kalman filter
; polymerase chain reaction
; resource assessment
; satellite data
; semiarid region
; soil moisture
; spatiotemporal analysis
; streamflow
; water resource
; water storage
; China
; Gansu
; Hexi Corridor
; Shiyang River
英文摘要: An accurate estimation of water resources dynamics is crucial for proper management of both agriculture and the local ecology, particularly in semi-arid regions. Imperfections in model physics, uncertainties in model land parameters and meteorological data, as well as the human impact on land changes often limit the accuracy of hydrological models in estimating water storages. To mitigate this problem, this study investigated the assimilation of terrestrial water storage variation (TWSV) estimates derived from the Gravity Recovery And Climate Experiment (GRACE) data using an ensemble Kalman filter (EnKF) approach. The region considered was the Hexi Corridor in northern China. The hydrological model used for the analysis was PCR-GLOBWB, driven by satellite-based forcing data from April 2002 to December 2010. The impact of the GRACE data assimilation (DA) scheme was evaluated in terms of the TWSV, as well as the variation of individual hydrological storage estimates. The capability of GRACE DA to adjust the storage level was apparent not only for the entire TWSV but also for the groundwater component. In this study, spatially correlated errors in GRACE data were taken into account, utilizing the full error variance-covariance matrices provided as a part of the GRACE data product. The benefits of this approach were demonstrated by comparing the EnKF results obtained with and without taking into account error correlations. The results were validated against in situ groundwater data from five well sites. On average, the experiments showed that GRACE DA improved the accuracy of groundwater storage estimates by as much as 25 %. The inclusion of error correlations provided an equal or greater improvement in the estimates. In contrast, a validation against in situ streamflow data from two river gauges showed no significant benefits of GRACE DA. This is likely due to the limited spatial and temporal resolution of GRACE observations. Finally, results of the GRACE DA study were used to assess the status of water resources over the Hexi Corridor over the considered 9-year time interval. Areally averaged values revealed that TWS, soil moisture, and groundwater storages over the region decreased with an average rate of approximately 0.2, 0.1, and 0.1 cm yr-1 in terms of equivalent water heights, respectively. A particularly rapid decline in TWS (approximately -0.4 cm yr-1) was seen over the Shiyang River basin located in the southeastern part of Hexi Corridor. The reduction mostly occurred in the groundwater layer. An investigation of the relationship between water resources and agricultural activities suggested that groundwater consumption required to maintain crop yield in the growing season for this specific basin was likely the cause of the groundwater depletion. © 2017 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79197
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geoscience and Remote Sensing, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, Netherlands; School of Engineering, Faculty of Engineering and Built Environment, University of Newcastle, Callaghan, NSW, Australia; Department of Water Resources, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, Netherlands; School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA, United States; Department of Physical Geography, Faculty of Geosciences, Utrecht University, Utrecht, Netherlands; Department of Hydraulic Engineering, Tsinghua University, Beijing, China; State Key Lab of Hydroscience and Engineering, Tsinghua University, Beijing, China
Recommended Citation:
Tangdamrongsub N,, Steele-Dunne S,C,et al. Improving estimates of water resources in a semi-arid region by assimilating GRACE data into the PCR-GLOBWB hydrological model[J]. Hydrology and Earth System Sciences,2017-01-01,21(4)