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| Created: | Feb 08, 2023 at 4:37 a.m. | |
| Last updated: | Feb 08, 2023 at 4:37 a.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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Abstract
The Minqin Basin is at the lower reach of the Shiyang River of Gansu province in northwest China. Dramatic decline in groundwater level has resulted from over-abstraction of groundwater since the late 1950s to satisfy increasing irrigation and other demands. Severe water shortage led to environmental degradation. To better understand the spatial-temporal variation of groundwater levels and to evaluate the groundwater resources in the region, a three-dimensional regional groundwater flow model was built and calibrated under transient condition. The MODFLOW program was used and the research area was discretized as a square network with cell size of 400 x 400 m. The model showed that the aquifer was under destructive stress, with a groundwater resource deficit of 260 million cubic meters per year (Mm(3)/year) on average. Since the inflow of surface water from the upstream basin has declined to about 100-150 Mm(3)/year in recent decades, the irrigation return flow had become the main recharge and accounted for 60.6% of total recharge; meanwhile, abstraction by pumping wells took 99.2% from the total groundwater discharge.
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Additional Metadata
| Name | Value |
|---|---|
| DOI | 10.1007/s12665-011-1165-y |
| Depth | 100 |
| Scale | 1 001 - 10 000 km² |
| Layers | 4 |
| Purpose | Groundwater resources |
| GroMoPo_ID | 207 |
| IsVerified | True |
| Model Code | MODFLOW |
| Model Link | https://doi.org/10.1007/s12665-011-1165-y |
| Model Time | 2003 - 2008 |
| Model Year | 2012 |
| Model Authors | Zhang, YL; Ma, JH; Chang, XL; van Wonderen, J; Yan, LL; Han, JH |
| Model Country | China |
| Data Available | Report/paper only |
| Developer Email | majh@lzu.edu.cn |
| Dominant Geology | Model focuses on multiple geologic materials |
| Developer Country | Peoples R China; England |
| Publication Title | Water resources assessment in the Minqin Basin: an arid inland river basin under intensive irrigation in northwest China |
| Original Developer | No |
| Additional Information | In this study, amounts of pumped water were estimated by the electricity consumption method. The results show that it was an effective way to obtain the pumping discharge. The three-dimensional groundwater flow model gave insight into groundwater resources. The calibration results showed reasonable (and acceptable) agreement between the observed and calculated heads for most observation wells. The numeric model reproduced the dynamic process of groundwater flow in the basin. According to the results, the groundwater system was not in balance and the situation was far from sustainable because the total discharge was much larger than the recharge. A deficit of 260 million cubic meters on average resulted in groundwater level decline at an average rate of 0.42 m per year and ninety-five percent of the deficit was caused by agricultural irrigation. |
| Integration or Coupling | Water management |
| Evaluation or Calibration | Dynamic water levels |
| Geologic Data Availability | Yes |
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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