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Investigation of Safe and Sustainable Yields for the Sandy Complex Aquifer System in the Ergene River Basin, Thrace Region, Turkey

2005; Volume: 14; Issue: 2 Linguagem: Inglês

1303-619X

Şebnem Ökten, Hasan Yazıcıgil,

Hydraulic Fracturing and Reservoir Analysis

This study aims to determine the safe and sustainable yields for the Sandy Complex aquifer system in Ergene River basin in northwestern Turkey. A numerical ground-water flow model was developed for the Sandy Complex aquifer, which is the most productive and the most widespread aquifer in the basin. The finite difference ground-water model was used to simulate steady and unsteady flow in the aquifer. The model was calibrated in two steps: a steady-state calibration, by using the observed ground-water levels of January 1970; then a transient calibration, by using the observed ground-water levels for the period of January 1970 and December 2000. The resulting model was used to develop ground-water pumping scenarios in order to predict the changes in the aquifer system under a set of different pumpage conditions for a planning period of 30 years between January 2001 and December 2030. A total of eight pumping scenarios were developed under transient-flow conditions for the planning period, and the results were evaluated to determine the safe and sustainable yields of the aquifer. The results, presented in the form of a trade-off curve, demonstrate that both the safe and the sustainable yield values are exceeded if pumping continues at the present rate. An appropriate suite of management policies and plans are provided that will promote the sustainable development of the aquifer system. Ozet: Bu cal›flman›n amac› Turkiye'nin kuzeybat›s›ndaki Ergene havzas› Kumlu Kompleks akifer sisteminin emniyetli ve surdurulebilir verimlerinin belirlenmesidir. Havzadaki en yayg›n ve en verimli akifer olan Kumlu Kompleks akiferin say›sal yeralt›suyu modeli oluflturulmufltur. Sonlu farklar yeralt›suyu modeli akiferdeki kararl› ve karars›z ak›m› benzefltirmesi icin kullan›lm›flt›r. Model kalibrasyonu 1970 y›l›n›n Ocak ay›nda saha koflullar›nda gozlenen su seviyeleri ile yap›lan kararl› ak›m koflullar›nda kalibrasyon ve bunu izleyen Ocak 1970—Aral›k 2000 doneminde gozlenen su seviyeleri ile yap›lan karars›z ak›m koflullar›nda kalibrasyon olmak uzere iki aflamada gerceklefltirilmifltir. Ortaya c›kan model Ocak 2001 ve Aral›k 2030 y›llar› aras›n› kapsayacak flekilde 30 y›ll›k bir planlama donemi goz onune al›narak akifer sisteminin ceflitli pompaj koflullar› alt›ndaki tepkisini belirlemek ve alternatif yeralt›suyu yonetim senaryolar› kurulmas› icin kullan›lm›flt›r. Planlama donemi icin toplam sekiz yonetim senaryosu karars›z ak›m koflullar› alt›nda kurulmufl ve sonuclar akiferin emniyetli ve surdurulebilir verimlerinin belirlenmesinde kullan›lm›flt›r. Deifl-tokufl erisi fleklinde sunulmufl olan sonuclar, gunumuzdeki pompaj koflullar›n›n akiferin emniyetli ve surdurulebilir verimlerinin ustunde olduunu gostermifltir. Akifer sisteminin surdurelebilir geliflmesini teflvik edecek bir dizi uygun yonetim politikalar› ve planlar› onerilmifltir.