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| Created: | Feb 08, 2023 at 3:41 a.m. | |
| Last updated: | Feb 08, 2023 at 3:42 a.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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| Views: | 646 |
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Abstract
Climate change can have an adverse effect on agricultural productivity and water availability in semi-arid regions, as changes in surface water availability lead to groundwater depletion and resultant losses in crop yield. These inter-relationships necessitate an integrated management approach for surface water, groundwater, and crop yield as a holistic system. This study quantifies the future availability of surface water and groundwater and associated crop production in a large semi-arid agro-urban river basin in which agricultural irrigation is a leader consumer of water. The region of study is the South Platte River Basin (72,000 km(2)), Colorado, USA. The coupled SWAT-MODFLOW modeling code is used as the hydrologic simulator and forced with five different CMIP5 climate models downscaled by Multivariate Adaptive Constructed Analogs (MACA), each for two climate scenarios, RCP4.5, and RCP8.5, for 1980-2100. The hydrologic model accounts for surface runoff, soil lateral flow, groundwater flow, ground-water-surface water interactions, irrigation from surface water and groundwater, and crop yield on a per-field basis. In all climate models and emission scenarios, an increase of 3 to 5 degrees C in annual average temperature is projected. Whereas, variation in the projected precipitation depends on topography and distances from mountains. Based on the results of this study, the worst-case climate model in the basin is IPSL-CM5A-MR-8.5. Under this climate scenario, for a 1 degrees C increase in temperature and the 1.3% reduction in annual precipitation, the basin will experience an 8.5% decrease in stream discharge, 2-5% decline in groundwater storage, and 11% reduction in crop yield. These results indicate the significant effect of climate change on water and food resources of a large river basin, pointing to the need for immediate implementation of conservation practices. (C) 2021 Elsevier B.V. All rights reserved.
Subject Keywords
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Additional Metadata
| Name | Value |
|---|---|
| DOI | 10.1016/j.scitotenv.2021.147717 |
| Depth | 80 |
| Scale | 10 001 - 100 000 km² |
| Layers | 1 |
| Purpose | Groundwater resources |
| GroMoPo_ID | 176 |
| IsVerified | True |
| Model Code | MODFLOW;SWAT |
| Model Link | https://doi.org/10.1016/j.scitotenv.2021.147717 |
| Model Time | SS |
| Model Year | 2021 |
| Model Authors | Aliyari, F; Bailey, RT; Arabi, M |
| Model Country | United States |
| Data Available | Report/paper only |
| Developer Email | Fatima.Aliyari@colostate.edu |
| Dominant Geology | Unsure |
| Developer Country | United States of America (US) |
| Publication Title | Appraising climate change impacts on future water resources and agricultural productivity in agro-urban river basins |
| Original Developer | No |
| Additional Information | This study quantifies the future availability of surface water and groundwater and associated crop production in a large semi-arid agro-urban river basin in which agricultural irrigation is a leader consumer of water. The region of study is the South Platte River Basin (72,000 km2), Colorado, USA. The coupled SWAT-MODFLOW modeling code is used as the hydrologic simulator and forced with five different CMIP5 climate models downscaled by Multivariate Adaptive Constructed Analogs (MACA), each for two climate scenarios, RCP4.5, and RCP8.5, for 1980–2100. |
| Integration or Coupling | Water use;Water management |
| Evaluation or Calibration | Dynamic water levels |
| Geologic Data Availability | No |
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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