Modeling the impact of rainfall variations and management interventions on the groundwater regime of a hard-rock terrain in central India
| Autor: | Ranjan Kumar Ray, Tajdarul H. Syed, Dipankar Saha, B. C. Sarkar |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
geography
geography.geographical_feature_category Hydrogeology 010504 meteorology & atmospheric sciences Groundwater flow 0208 environmental biotechnology Aquifer Terrain 02 engineering and technology Groundwater recharge 01 natural sciences 020801 environmental engineering Sustainability Earth and Planetary Sciences (miscellaneous) Carbonate rock Environmental science Water resource management Groundwater 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Hydrogeology Journal. 28:1209-1227 |
| ISSN: | 1435-0157 1431-2174 |
| Popis: | Realistic assessment and prediction of groundwater resources, at appropriate scales, are crucial for proper management and systematic development of groundwater in India. An equivalent porous medium (EPM)-based groundwater flow model is implemented for a typical hard-rock aquifer in central India, to provide quantification, analysis and prediction of groundwater balance components. This research also provides refined estimates of aquifer parameters, recharge factors and newer insights into groundwater dynamics. It is observed that evaporative losses and effluent seepage of groundwater to rivers jointly account for ~20% of the annual recharge, which is significantly higher than most prior regional assessments. Evaluation of groundwater resource use under a business-as-usual scenario shows annual groundwater draft to exceed recharge by 13% in the year 2020–2021, and under a worst-case scenario (with prevailing drought conditions) this deficit is predicted to increase to 30%. However, with suitable recharge augmentation and demand control measures, in the best-case scenario, groundwater draft can be contained to ~90% of annual recharge, thereby ensuring long-term sustainability of groundwater resources. Importantly, this study reveals that demand control measures can be more effective than recharge augmentation measures. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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