Hydrodynamic and isotopic investigations for evaluating the mechanisms and amount of groundwater seepage through a rockslide dam
| Autor: | Petitta, Marco, SCARASCIA MUGNOZZA, Gabriele, Mugnozza, G. S., Barbieri, Maurizio, BIANCHI FASANI, Gianluca, Fasani, G. B., Esposito, Carlo |
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| Rok vydání: | 2010 |
| Předmět: |
Hydrology
geography geography.geographical_feature_category Groundwater flow Water table Aquifer Rockslide Groundwater recharge Groundwater discharge rockslide dam water isotopes seasonal monitoring oxygen-18 groundwater transfer central apennines italy Groundwater model Geology Groundwater Water Science and Technology |
| Zdroj: | Hydrological Processes. 24:3510-3520 |
| ISSN: | 0885-6087 |
| DOI: | 10.1002/hyp.7773 |
| Popis: | This study addresses the influence of landslide dams on surface water drainage and groundwater flow. In the study area of Scanno Lake and Sagittario River (Central Italy), a limestone rockslide-avalanche formed a lake, which has an outlet that is occasionally active, showing infiltration into the rockslide dam. Several springs are present at the lake's base and are partly fed by seepage through the rockslide debris. Piezometric surveys, discharge measurements, pumping tests and chemical analyses are tools used to build a conceptual model of the groundwater flow and to evaluate the flow through the rockslide debris. Seasonal water isotopic signatures validate the assumed model, showing a mixing of infiltration recharge and groundwater seepage throughout the rockslide debris. Various recharge areas have been found for springs, pointing out those directly fed by the rockslide debris aquifer. Hypotheses about seasonal groundwater mixing between the regional carbonate aquifer and the rockslide debris aquifer are supported by isotope results. Seasonal changes in groundwater table level due to recharge and surface losses from seasonal outlet have been correlated with isotopic groundwater composition from the rockslide debris aquifer and the downstream springs; this relationship highlights the role of the rockslide dam body on the hydrodynamics of the studied area. Relationships between surface waters and groundwater in the area have been completely understood on the basis of water isotopic fingerprinting, finally obtaining a complete evaluation of groundwater renewable resources and its regimen. Copyright © 2010 John Wiley & Sons, Ltd. |
| Databáze: | OpenAIRE |
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