Hydrological Droughts and Runoff Trends of the Demirköprü Dam Reservoir Basin on Gediz River, Turkey

In recent years, the impacts of climate change on water resources are much more noticeable. In terms of sustainable management of water resources, it is important to identify drought occurrences in river basins and to identify drought trends. For this purpose, many drought indices have been developed in order to define the droughts quantitatively and Streamflow Drought Index (SDI) method is frequently used to determine the hydrological droughts among them. In this study, hydrological droughst of on Acısu, Selendi, Deliiniş, Demirci sub-basins and incoming total runoff to Demirköprü Dam reservoir on the Gediz River were analyzed in monthly, quarterly, six-month and annual timescales. The total inflows of Demirköprü Dam reseroir trends were investigated at same time scales.As a result of the study, it was determined that the all sub-basins runoff and incoming total runoff to Demirköprü Dam reservoir were affected from hydrological droughts for long periods and trends of incoming runoff to Demirköprü Dam reservoir were towards the dry periods.

Gediz Nehri Demirköprü Baraj Havzasının Hidrolojik Kuraklıkları ve Eğilimleri

Son yıllarda, iklim değişikliğinin su kaynakları üzerindeki etkileri çok daha belirgin bir biçimde ortaya çıkmaktadır. Su kaynaklarının sürdürülebilir yönetimi açısından, nehir havzalarındaki kuraklık olaylarını ve kuraklık eğilimlerini tanımlamak büyük önem taşımaktadır. Bu amaçla, kuraklıkları niceliksel olarak tanımlamak için birçok kuraklık endeksi geliştirilmiştir ve bilhassa hidrolojik kuraklıkları belirlemek amacıyla Streamflow Drought Index (SDI) yöntemi sıkça kullanılmaktadır. Bu çalışmada Gediz Nehri'ndeki Acısu, Selendi, Deliiniş, Demirci havzaları ve Demirköprü Baraj rezervuarındaki hidrolojik kuraklık ve eğilimleri aylık, üç aylık, altı aylık ve yıllık zaman ölçeklerinde incelenmiştir. Çalışma sonucunda, Demirköprü Barajı havzası girişlerinin uzun süre hidrolojik kuraklıklardan etkilendiği ve kuraklık analizlerinin kurak dönemleri işaret ettiği tespit edilmiştir.

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