Risk assessment of hydrological drought in water-donating and water-receiving areas of an inter-basin water diversion project
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View abstract on PubMed
Summary
This summary is machine-generated.Hydrological drought intensified in China's Tao River Water Diversion Project (TRWDP) regions. While the TRWDP eased drought in receiving areas, it shifted pressure to donating regions, necessitating balanced water governance.
Area Of Science
- Hydrology and Water Resources Management
- Environmental Science
- Climate Change Adaptation
Background
- Droughts are major natural disasters in arid/semi-arid regions, impacting socio-economic and agricultural systems.
- Inter-basin water diversion projects are common solutions for water scarcity, but their dual impact on donating and receiving areas is understudied.
- The Tao River Water Diversion Project (TRWDP) in Gansu, China, provides a case study for examining these impacts.
Purpose Of The Study
- To investigate the spatiotemporal evolution and risk of hydrological drought (HD) in regions affected by the TRWDP.
- To assess the influence of water diversion on drought dynamics in both water-donating (TRB) and water-receiving regions (ZRB and WRB).
- To provide a scientific basis for adaptive management of large-scale water transfer projects.
Main Methods
- Integration of hydro-meteorological datasets and SWAT-based hydrological modeling.
- Assessment of hydrological drought (HD) dynamics using the Standardized Runoff Index (SRI) from 1970 to 2020.
- Correlation analysis of drought drivers and a risk assessment framework (hazard, exposure, vulnerability).
Main Results
- Hydrological drought (HD) shows a worsening trend, most intensely in the Water Receiving Basin (WRB).
- Drought characteristics are influenced by diverse climatic and catchment attributes specific to each region (TRB, ZRB, WRB).
- The TRWDP significantly reduced drought risk in receiving areas but potentially increased pressure on donating regions.
Conclusions
- The study identifies critical drought hotspots in the lower Tao River Basin (TRB) and central WRB.
- While the TRWDP benefits water-receiving areas, it highlights the need for balanced inter-basin water governance to mitigate drought redistribution.
- Findings support adaptive management strategies for large-scale water transfer projects facing climate variability.
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