DOI: 10.5194/hess-19-823-2015
Scopus记录号: 2-s2.0-84922805922
论文题名: A high-resolution global-scale groundwater model
作者: De Graaf I ; E ; M ; , Sutanudjaja E ; H ; , Van Beek L ; P ; H ; , Bierkens M ; F ; P
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期: 2 起始页码: 823
结束页码: 837
语种: 英语
Scopus关键词: Aquifers
; Budget control
; Drought
; Groundwater
; Groundwater flow
; Groundwater resources
; Lithology
; Potable water
; Sensitivity analysis
; Surface waters
; Water
; Water levels
; Groundwater modeling
; Groundwater system
; Hydrological models
; Industrial activities
; Parameter setting
; Saturated conductivity
; Unconfined aquifers
; Water availability
; Recharging (underground waters)
; agricultural practice
; aquifer characterization
; baseflow
; climate forcing
; drinking water
; global change
; hydrogeology
; industrial practice
; recharge
; water budget
英文摘要: Groundwater is the world's largest accessible source of fresh water. It plays a vital role in satisfying basic needs for drinking water, agriculture and industrial activities. During times of drought groundwater sustains baseflow to rivers and wetlands, thereby supporting ecosystems. Most global-scale hydrological models (GHMs) do not include a groundwater flow component, mainly due to lack of geohydrological data at the global scale. For the simulation of lateral flow and groundwater head dynamics, a realistic physical representation of the groundwater system is needed, especially for GHMs that run at finer resolutions. In this study we present a global-scale groundwater model (run at 6' resolution) using MODFLOW to construct an equilibrium water table at its natural state as the result of long-term climatic forcing. The used aquifer schematization and properties are based on available global data sets of lithology and transmissivities combined with the estimated thickness of an upper, unconfined aquifer. This model is forced with outputs from the land-surface PCRaster Global Water Balance (PCR-GLOBWB) model, specifically net recharge and surface water levels. A sensitivity analysis, in which the model was run with various parameter settings, showed that variation in saturated conductivity has the largest impact on the groundwater levels simulated. Validation with observed groundwater heads showed that groundwater heads are reasonably well simulated for many regions of the world, especially for sediment basins (R2= 0.95). The simulated regional-scale groundwater patterns and flow paths demonstrate the relevance of lateral groundwater flow in GHMs. Inter-basin groundwater flows can be a significant part of a basin's water budget and help to sustain river baseflows, especially during droughts. Also, water availability of larger aquifer systems can be positively affected by additional recharge from inter-basin groundwater flows. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78607
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Physical Geography, Faculty of Geosciences, Utrecht University, Utrecht, Netherlands; Unit Soil and Groundwater Systems, Deltares, Utrecht, Netherlands
Recommended Citation:
De Graaf I,E,M,et al. A high-resolution global-scale groundwater model[J]. Hydrology and Earth System Sciences,2015-01-01,19(2)