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Trend and Correlation Analysis of Average Flow and Rainfall Amounts at Dalaman and Eşen River Basins

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Increasing population, urbanization, and industrialization create pressure on water resources. On the other hand, regional disparities and global climate change make this situation inextricable. Therefore, the sharing of fresh water resources, its utilization, and its management have come to the forefront.

As an indispensable element for human life, water resources are the natural resources that must be used in a sustainable way in the long term, and need to be conserved (Yorulmaz 2006). Turkey has a water potential of 3,690 m3 per person, which is much lower than the world average of 7,600 m3. With this water potential, Turkey cannot be classified as water stressed, but it is among the countries with water shortages (Özfidaner et al. 2007). Studies undertaken on the determination of the current state of freshwater resources are increasing in number and scope due to the need for a planned consumption policy. In this context, trend analysis of monthly and annual average discharge of the Dalaman and Eşen rivers, the major rivers in southwest Anatolia, and monthly and annual total rainfall amounts obtained from the meteorological stations in the region, was carried out. The direction of the trend and the degree of the relationship between average monthly level of the current and the monthly total rainfall amounts were investigated.

Dalaman and Eşen rivers are located in the southwest of Turkey within the Mediterranean region (Fig. 8-1). Both rivers flow into the Mediterranean Sea. The Dalaman River is located in the south of the Gölhisar district of Burdur province. Its source lies in the north slopes of the Yeşilgöl Mountains and it enters the Mediterranean Sea between the Ortaca and Dalaman districts of Muğla province. The 229 km long river is an important river in the region (Özdemir et al. 2007). The Eşen River stretches roughly in a north-south direction, being embedded in a tectonic subsidence trough, and reaches the sea in the flood-delta plain formed by filling a wide gulf in the southern part of the mouth (Öner 2001). The Eşen River constitutes the border between Muğla and Antalya, and is 146 km long (Yorulmaz 2006).

Document Type: Research Article


Publication date: January 1, 2011

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