Injection of fresh river water into a saline floodplain aquifer as a salt interception measure in a semi-arid environment
| Autor: | Hamideh Nouri, Simon Beecham, Ian Jolly, Sina Alaghmand, Kate Holland, Juliette Woods, A. M. Hassanli |
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| Přispěvatelé: | Alaghmand, Sina, Beecham, Simon, Woods, J A, Holland, K L, Jolly, I D, Hassanli, Ali, Nouri, Hamideh |
| Rok vydání: | 2015 |
| Předmět: |
HydroGeoSphere
Hydrology geography Environmental Engineering Soil salinity geography.geographical_feature_category Floodplain Aquifer freshwater injection Management Monitoring Policy and Law Arid semi-arid saline floodplain Overbank Environmental science Water quality floodplain health Injection well Nature and Landscape Conservation Riparian zone |
| Zdroj: | Ecological Engineering. 75:308-322 |
| ISSN: | 0925-8574 |
| DOI: | 10.1016/j.ecoleng.2014.11.014 |
| Popis: | Floodplains in arid and semi-arid environments are hydrologically and ecologically essential components of the landscape. However, floodplain salinization has been highlighted as a significant risk for riparian tree health and river water quality. While various salt management measures have been developed, some of these have limited application in arid and semi-arid regions because of insufficient infrastructure and limited availability of supplemental environmental flows. Fresh river water injection into a saline floodplain aquifer can lead to environmental improvement using a relatively small amount of water and without the need for water disposal infrastructure. To explore the impacts of fresh river water injection on floodplain salinity, a physically-based, fully integrated numerical model was developed and calibrated against the observed data from a trial conducted in September 2006 at Clark's Floodplain in the Lower Murray in South Australia. It is shown that injection of an increased volume of river water leads to a larger extent of the subsequent freshwater lens. In addition, it is shown that for a given injection volume, it is more efficient to inject at a lower injection rate and for a longer duration. Also, the interface of the saturated/unsaturated zone appears to be the most effective injection screen depth. Moreover, in this case, a linear configuration of the injection wells was more effective compared to a rectangular configuration. Overall, the fresh river water injection is only able to maintain a temporary and spatially limited local freshwater lens. For long-term salt management, the river water injection needs to be periodically repeated in the absence of overbank flooding in the meantime Refereed/Peer-reviewed |
| Databáze: | OpenAIRE |
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