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Harsit Creek which is one of the major rivers of the Eastern Black Sea region in terms of both volumetric flow rate and length formed a small delta in east of the Giresun province and Tirebolu town centre by depositing the carried alluvium in the mouth portion. Floods caused by Harsit Creek and consisting partially covered with swamp prevents the use of delta as agricultural and residential area until 1950s. The rehabilitation of the Harsit Creek after 1950 and with the drainage of delta began to turn into first the agricultural field, after 1980 a residential area. These changes are today continuing by accelerating. In addition, the coastal road which is one of the country's major transportation projects and completed in 2000s is located in the coastal areas of the delta. The sand extraction is performed from down ground of Valley of Harsit Creek since the 1990s. Also in the years of 2000s ponds were built on Harsit Creek to produce electricity. These developments lead to a reduction the alluvial soils that are reached by Harsit Creek and it is threatening human facilities on delta. In the present study, aerial photographs belong to 1950, 1973, and 1984 and high-resolution satellite imagery belong to 2007 and 2014 have been analysed; field observations were made; it is focused on both futures of delta and changes in the delta by doing face to face interviews with local residents. In addition, measures to be taken were highlighted. [ABSTRACT FROM AUTHOR]

Demre Creek is one of the most important rivers of Southwest Anatolia with its basin width of about 1000 km2 and its delta of 22 km2. Beymelek Lagoon on the south of Demre delta was formed by accumulation of Demre Creek alluvial deposit before Beymelek Bay through coastal dynamics under the effect of prevailing south wind. The lake fed by karstic sources is independent of Demre Creek basin except for southwest delta and sandbars. In this research, it was determined that Demre Creek was formed during Neogene Period and that it first flowed into Beymelek Bay and later into the Mediterranean Sea from the southwest of the bay. Also, Demre Creek used these valleys throughout Pliocene-Lower Pleistocene Periods, but left these places due to tectonic activities and climatic fluctuations of the area and started to flow from its current valley during Middle Pleistocene. In this research, which aimed to determine the relation between the valley changes of Demre Creek during Paleogeography Periods and Beymelek Bay, geologic and geomorphologic characteristics of Demre Creek basin were analyzed in details and especially the evolution of the basin from its formation to Prior Holocene was dealt with. [ABSTRACT FROM AUTHOR]