Institute for Joint Geoscientific Research Contribution of Isotope Techniques to Water Resources Assessment Mebus A. Geyh 5th IHP/IAHS George Kovacs Colloquium.

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Presentation transcript:

Institute for Joint Geoscientific Research Contribution of Isotope Techniques to Water Resources Assessment Mebus A. Geyh 5th IHP/IAHS George Kovacs Colloquium UNESCO, Paris, June 2000

Institute for Joint Geoscientific Research

Institute for Joint Geoscientific Research Khartoum, Sudan How much more groundwater can be pumped for the drinking water supply ?

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Institute for Joint Geoscientific Research Conclusion —Present-day groundwater recharge by the Nile river is about 20% of the pumping rate. —Mainly fossil groundwater is pumped for the drinking water supply recharged some 4000 yr BP. —The piezometric surface is mainly the relict of the palaeo-groundwater.

Institute for Joint Geoscientific Research Thar Desert, Pakistan Is fresh groundwater recharged ? Thar Desert, Pakistan Is fresh groundwater recharged ?

Institute for Joint Geoscientific Research Cholistan Area of hydrogeological reconnaissance 15,500 km 2 habitants 300,000 heads of animals 2,000,000 minimum temperature -3°C maximum temperature +50°C annual precipitation rate <200 mm/yr potential evaporation rate mm/yr

Institute for Joint Geoscientific Research mio m 3 /yr fresh groundwater in the Thar desert ! —How large was the groundwater recharge rate ? —When was the fresh groundwater recharged ? —How was the fresh groundwater recharged ?

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Institute for Joint Geoscientific Research Conclusion —Recharge occurred between 16,000 to 4000 yr BP. —Recharge rate was about 5 mm/yr in the past while that of today is around 1 mm/yr. —Recharge occurred from innundations of the Old Hakra River.

Institute for Joint Geoscientific Research Bandung, Indonesia

Institute for Joint Geoscientific Research —Are the Lembang and Bandung Basins hydraulically connected ? —How large is the vulnerability to pollute the fesh water resources ? Drinking Water for Bandung

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Institute for Joint Geoscientific Research Lembang water

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Institute for Joint Geoscientific Research Conclusion — More than 30% of the pumped water is recharged in the Lembang Basin. — The residence time of the pumped groundwater ranges from 1000 to 10,000 yr.

Institute for Joint Geoscientific Research —Geohydraulic parameters aquifer architecture hydraulic conductivity paleohydrological situation —Water components of the hydrological cycle origin of water components sources of and vulnerability to pollution —Groundwater movement and mass transport pathways, recharge and discharge areas transit and residence times / water balance estimation of recharge and discharge rates interconnection of surface water and groundwater mixing processes and ratios (e.g. salinization) tracing overexploitation and re-use of waste water Potential of Isotope Hydrological Methods