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| Titel |
Planning of water supply infrastructure on the basis of sustainable water resources management in Kayseri Metropolitan City, Central Turkey: A plan for the year 2050 |
| VerfasserIn |
Mustafa Değirmenci, Levent Tezcan, Mehmet Ekmekci, Eyup Atmaca, Ahnet Altın, Otgonbayar Namkhai, Mustafa Yazici, Ender Batukan |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250047964
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| Zusammenfassung |
| The metropolitan city of Kayseri is an ever growing settlement in central Turkey where the
climate is semi-arid. The total population of the metropolitan is about 912 000 by the year
2010. Annually about 55 million cubicmeter of water for domestic use in the municipality is
supplied by the Directorate of Water and Sewage Administration of the Kayseri Metropolitan
Municipality, directly from groundwater resources. About one fifth of this amount is
provided by a spring while the rest is pumped out through boreholes. The groundwater
abstracted for use is of high quality owing to the volcanic rock aquifer. However,
the aquifer extends beneath the settlement area of the metropolitan city. All the
extraction wells are today surrounded by either houses, apartments and industrial
complexes. Abondaned waste disposal sites have been located on the top of the
aquifer. Being aware of the risk of groundwater pollution, the increasing demand
for high quality water has lead the municipality to make a plan to maintain the
high quality and sufficient water supply to the inhabitants for the year 2050. A
hydrogeological study to appraise the groundwater resources in the area was conducted
and the groundwater system is modeled to provide a sound basis for a sustainable
use of the groundwater resources. The volcanic aquifer is recharged mainly by the
snow-melt on the high Erciyes mountain and the remote recharge area is not suitable for
human activities except the skiing resorts in some parts. The aquifer is well fractured
and highly heterogeneous particularly due to the lava tubes and the slack material
that produced during various phases of the volcanic activities. A major part of the
volcanic rock aquifer is overlain by a moderately thick alluvial deposits which
form a secondary aquifer in the region. However, the shallow groundwater in the
alluvial aquifer is already contaminated by agrochemicals, fertilizers and waste
waters during the period before the sewage system had been constructed. There is a
delicate hydraulic balance between the contaminated upper aquifer and the lower
volcanic aquifer. The two aquifers are separated by massive but slightly fractured
basalt which acts as a semipervious layer. Therefore, it is essential to consider this
hydraulic balance and the possible interaction between these two aquifers during
exploitation of the volcanic aquifer. The groundwater flow and solute transport
model was developed to simulate the hydraulic balance under different exploitation
scenarios fort he future. The model also considered the adverse impacts of the climate
change on the groundwater resources in the area. A study on the impacts on cliamte
change on the meteorological parameters in the Kayseri region has revealed that the
precipitation will partly change in type, from snowfall to rainfall. This change is of utmost
improtance in the rate of recharge of the volcanic aquifer. The municipality utilizes a
SCADA system in controlling the water supply network. The system is available
for use in verification and validation of the mathematical model developed for the
groundwater system in the area, which will help in developing strategies to reduce
the running costs and water usage and maximize the efficient use of energy and
water.
This paper demonstrates the efficiency of the use of hydrogeological studies as a basis for
an efficient plan of water supply infrasturcture of a metropolitan municipality in a semi-arid
region in Turkey. |
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