Using isotopic techniques to investigate hydrogeologic properties of aquifers and springs is a common approach nowadays that overcomes problems of monitoring classical hydrogeologic parameters such as piezometric levels and groundwater flow velocities. Nevertheless, interpretation of the results and maintenance of long term isotopic monitoring are also difficult and resource consuming tasks. In the present study the isotopic composition of springs and rain water has been examined in various sampling sites of Western Crete in order to identify spring-aquifer interactions and propose appropriate management and restoration measures. The output of this effort illustrated 4 main groups of springs sharing common isotopic characteristics and recharge zones. These potential recharge areas for each group have been delineated by combining the isotopic and geological properties of the entire area with the contribution of GIS techniques.
Foster, S., Hirata, R., Gomes, D., D’elia, M. and Paris, M. (2002) Groundwater Quality Protection: A Guide for Water Utilities, Municipal Authorities, and Environment Agencies. World Bank, Washington DC. http://dx.doi.org/10.1596/0-8213-4951-1
Aggarwal, P.K., Froehlich, K. and Kulkarni, K.M. (2007) Environmental Isotopes in Groundwater Studies. In: Silveira, L. and Usunoff, E.J., Eds., Groundwater—Encyclopedia of Live Support Systems, EOLSS Publishers/UNESCO, Paris, 69-92.
Trembaczowski, A. and Halas, S. (1993) Sulphur and Oxygen Isotopes in Sulphates in Natural Waters: (1) Surface Waters of Relatively Unpolluted Terrains. Isotopes in Environmental and Health Studies, 28, 189-213.
Halder, J., Pralong, C., Bonvin, F., Lambiel, F. and Vennemann, W.T. (2014) Application of δ18O, δ13CDIC, and Major Ions to Evaluate Micropollutant Sources in the Bay of Vidy, Lake Geneva. Isotopes in Environmental and Health Studies, 1-18. http://dx.doi.org/10.1080/10256016.2014.971786
Murillo, R.S., Brooks, E., Elliot, J.W. and Bolla, J. (2015) Isotope Hydrology and Baseflow Geochemistry in Natural and Human-Altered Watersheds in the Inland Pacific Northwest, USA. Isotopes in Environmental and Health Studies, 51, 231-254. http://dx.doi.org/10.1080/10256016.2015.1008468
Dunning, C. (2010) Water Availability to Be Enhanced through Focus on National Water Resources Assessments. International Atomic Energy Agency, Isotope Hydrology Section, Vienna (Austria). http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/42/018/42018869.pdf
Dimitriou, E. and Zacharias, I. (2006) Groundwater Vulnerability and Risk Mapping in a Geologically Complex Area by Using Stable Isotopes, Remote Sensing and GIS Techniques. Environmental Geology, 51, 309-323. http://dx.doi.org/10.1007/s00254-006-0328-8
Hussain, N., Church, T.M. and Kim, G. (1999) Use of 222-Rn and 226-Ra to Trace Groundwater Discharge into the Chesapeake Bay. Marine Chemistry, 65, 127-134. http://dx.doi.org/10.1016/S0304-4203(99)00015-8
Diazconti Carreon, C., Nelson, S., Mayo, A., Tingey, D. and Maren, S. (2003) A Mixed Groundwater System at Midway, UT: Discriminating Superimposed Local and Regional Discharge. Journal of Hydrology, 273, 119-138. http://dx.doi.org/10.1016/S0022-1694(02)00359-1
Jones, I. and Banner, J. (2003) Estimating Recharge Thresholds in Tropical Karst Island Aquifers: Barbados, Puerto Ricoand Guam. Journal of Hydrology, 278, 131-143.
Kendall, C. and Mcdonnell, J.J. (1999) Isotope Tracers in Catchment Hydrology. Elsevier, Amsterdam, 204.
Königer, P., Uhlenbrook, S., Leibundgut, C., Jaeger, L. and Mayer, H. (2001) Isotope Hydrological Investigation on Groundwater Origin in the Flood Plain of the Upper Rhine Valley. In: Seiler, and Wohnlich, Ed., New Approaches Characterizing Groundwater Flow, Swets Zeitlinger, Lisse, 363-366.
Terwey, J.L. (1984) Isotopes in Groundwater Hydrology. Proceedings of the Harare Symposium: Challenges in African Hydrology and Water Resources, IAHS, Netherlands, 155-160.
Gibson, J.J., Edwards, T.W.D., Birks, S.J., St Amour, N.A., Buhay, W.M., Mceachern, P. and Peters, D.L. (2005) Progress in Isotope Tracer Hydrology in Canada. Hydrological Processes, 19, 303-327. http://dx.doi.org/10.1002/hyp.5766
Clark, I.D. and Fritz, P. (1997) Environmental Isotopes in Hydrogeology. CRC Press, Boca Raton, 185.
Chowdhury, A., Jha, M. and Chowdary, V.M. (2010) Delineation of Groundwater Recharge Zones and Identification of Artificial Recharge Sites in West Medinipur District, West Bengal, Using RS, GIS and MCDM Techniques. Environmental Earth Sciences, 59, 1209-1222. http://dx.doi.org/10.1007/s12665-009-0110-9
Mondaln. C. and Singhv. S. (2004) A New Approach to Delineate the Groundwater Recharge Zone in Hard Rock Terrain. Current Science, 87, 658-662.
Hunt, R.J., Steuer, J.J., Mansor, M.T. and Bullen, T.D. (2001) Delineating a Recharge Area for a Spring Using Numerical Modeling, Monte Carlo Techniques, and Geochemical Investigation. Ground Water, 39, 702-712. http://dx.doi.org/10.1111/j.1745-6584.2001.tb02360.x
Girmay, E., Ayenew, T., Kebede, S., Alene, M., Wohnlich, S. and Wisotzky, F. (2015) Conceptual Groundwater Flow Model of the Mekelle Paleozoic—Mesozoic Sedimentary Outlier and Surroundings (Northern Ethiopia) Using Environmental Isotopes and Dissolved Ions. Hydrogeology Journal, 23, 649-672.
Datta, P.S. and Tyagi, S.K. (2009) Delineation of Potential Groundwater Recharge and Productive Aquifer Zones in Delhi Area Based on 18O Signatures and GPS. Journal of Agricultural Physics, 9, 33-37.
Praamsma, T., Novakowski, K., Kyser, K. and Hall, K. (2009) Using Stable Isotopes and Hydraulic Head Data to Investigate Groundwater Recharge and Discharge in a Fractured Rock Aquifer. Journal of Hydrology, 366, 35-45. http://dx.doi.org/10.1016/j.jhydrol.2008.12.011
Perleros, V., Papamastorakis, D., Kritsotakis, M., Drakopoulou, E. and Panagopoulos, A. (2004) Groundwater Potential of the Island of Crete. Problems and Perspectives. Bulletin of the Geological Society of Greece, 36, 2048-2056.
Araguas-Araguas, L., Froehlich, K. and Rozanski, K. (2000) Deuterium and Oxygen-18 Isotope Composition of Precipitation and Atmospheric Moisture. Hydrological Processes, 14, 1341-1355. http://dx.doi.org/10.1002/1099-1085(20000615)14:8 3.0.CO;2-Z
Press, W.H., Teukolsky, S.A., Vetterling, W.T. and Flannery, B.P. (2002) Numerical Recipes in C+. Chapter 14: Statistical Description of Data. Cambridge University Press, Cambridge.
Hendrya, M.J. (1988) Do Isotopes Have a Place in Ground-Water Studies? Groundwater, 26, 410-415. http://dx.doi.org/10.1111/j.1745-6584.1988.tb00406.x