5 results on '"RIVERS"'
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2. Discussing the Effects of Climate Change and Urbanization through Flood Disaster in Riverside Settlements
- Author
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Zeynep Özdemir and Merve Özkaynak Yolcu
- Subjects
resilient cities ,climate change ,rivers ,flooding ,overflow ,bozkurt ,i̇nebolu ,Disasters and engineering ,TA495 ,Environmental sciences ,GE1-350 - Abstract
Climate change-induced floods and flood disasters pose a serious threat to many settlements on a global scale. These disasters not only cause great damage to human life and economic activities, but also adversely affect the built environment. Factors such as increased rainfall due to climate change, destruction of agricultural lands and forest areas, infrastructure deficiencies, unpreparedness of settlements for natural disasters, wrong positioning and unplanned construction are effective in the occurrence of flood disasters. Therefore, in order to prevent flood disasters, it is necessary to adopt an integrated disaster management approach and develop effective and sustainable solutions in order to increase the flood resistance of settlements, especially on the banks of rivers, and to reduce the impacts against possible disasters. In this study, firstly, the floods that occurred in Bozkurt, Ayancık and İnebolu-Özlüce in 2021 were analyzed. Based on these findings, the causes of flood disasters that occurred in Inebolu in 2022 and 2023 were investigated in the field research section. Qualitative data analysis method was used as a method in the study. In addition, in the examination of the sample areas, the damages were examined through observation with the help of photographs. Flood hazard risks were examined in accordance with the flood management plans in the sample areas determined within the scope of the study and problems were identified as a result of the findings obtained. The identified problems were evaluated within the scope of planning, design principles and legal and administrative framework. As a result, recommendations are presented for making river coastal settlements resistant to flood disasters.
- Published
- 2024
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3. Trend Analysis for Streamflow of Devrekani Stream (Turkey).
- Author
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KALE, SEMİH and SÖNMEZ, ADEM YAVUZ
- Subjects
TREND analysis ,STREAMFLOW ,SNOWMELT ,WATER supply ,WATER use ,WATER consumption ,RIVERS - Abstract
Copyright of Review of Hydrobiology is the property of NK Yayincilik Egitim Hizmetleri and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
4. DEMRE ÇAYININ PALEOCOğRAFİ DÖNEM VADİ DEğİşİKLİKLERİ VE BEYMELEK LAGÜNÜ'NÜN JEOMORFOLOJİK EVRİMİ.
- Author
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KESER, Nurdan
- Subjects
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PALEOGEOGRAPHY , *LAGOONS , *ALLUVIUM , *RIVERS , *CLIMATE change - Abstract
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]
- Published
- 2012
5. El Nino ve La Nina olaylarının Türkiye'deki nehir akımları ve yağış değerleri üzerindeki etkileri
- Author
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Karabörk, M. Çağatay, Kahya, Ercan, and Diğer
- Subjects
Harmonic analysis ,Rainfall ,Rivers ,Climate change ,La Nina ,İnşaat Mühendisliği ,Civil Engineering ,Southern oscillation ,Spectrum analysis ,El Nino - Abstract
ÖZET Doktora Tezi EL NİNO VE LA NİNA OLAYLARININ TÜRKİYE'DEKİ NEHİR AKIMLARI VE YAĞIŞ DEĞERLERİ ÜZERİNDEKİ ETKİLERİ M. Çağatay KARABÖRK Selçuk Üniversitesi Fen Bilimleri Enstitüsü İnşaat Mühendisliği Anabilim Dalı Danışman : Doç. Dr. Ercan KAHYA 2000, 110 Sayfa Jüri : Prof. Dr. A. Ünal Sorman Prof. Dr. Tülay Özbek Doç. Dr. Nizamettin Çiftçi Doç. Dr. Ercan Kahya Doç. Dr. Ali Berktay Dünyanın pek çok yerinde görülen iklim değişikleri, Tropikal Pasifik Okyanusu'nda ortaya çıkan ve Güney Salınımı'nın ekstrem fazlarını oluşturan El Nino ve La Nina olayları ile ilişkilidir. El Nino ve La Nina ilişkili iklim değişiklikleri ile bunların yağış ve akım paternleri üzerindeki etkileri ağırlıklı olarak 1980'li yılların başından itibaren yapılan global ve bölgesel ölçekli pek çok çalışma ile ortaya konulmuştur. Bununla beraber, adı geçen olayların Türkiye'nin yağış ve akım paternleri üzerindeki etkileri açıklığa kavuşturulmuş değildir. Bu çalışmada, 76 akım gözlem istasyonunda ölçülen aylık ortalama akım değerleri ve 94 istasyonda ölçülen aylık toplam yağış değerleri kullanılmak suretiyle El Nino ve La Nina olaylarının Türkiye'nin yağış ve akım paternleri üzerindeki etkileri detaylı olarak incelenmiş ve bu etkilerin şiddetleri, fazlan ve coğrafik uzanımları belirlenmiştir. İstasyonların 24 aylık El Nino ve La Nina kompozitlerine uygulanan birinci harmonikler söz konusu olaylara bu hidrometeorolojik parametrelerin tepkisi olarak kabul edilmiştir. Birinci harmoniklerin haritada vektörel gösterimi ile aday bölgeler belirlenmiş, daha sonra bu bölgelerdeki El Nino ve La Nina sinyallerinin kararlılık analizi yapılarak El Nino ve La Nina olaylarına tepki veren kararlı bölgeler ortaya konulmuştur. Güney Salınımı'nın eksrem fazlarının kararlı bölgelerdeki yağış ve akım serileri ile olan ilişkisinin istatistiksel önemi hipergeometrik dağılımla belirlenmiştir. Bu analizlerin sonucunda, hem yağış hem de akım değerleri için, ülkenin doğu ve batısında El Nino ilişkili ıslak sezonlara sahip bölgeler belirlenmiştir. La Nina olayları içinse ülkenin sadece doğusunda La Nina ilişkili kurak sezona sahip bölgeler belirlenmiştir. El Nino ilişkili kararlı bölgelerin modüler yıllık ve sezonluk yağış ve akım serileri üzerinde gerçekleştirilen spektral analiz sonucu El Nino ilişkili sayılan periyotlardaki harmonikler önemli bulunmuş ve bu durumun çalışmadaki diğer bulguları desteklediği sonucuna varılmıştır. Anahtar Kelimeler : El Nino, La Nina, ENSO, yağış, nehir akımı, Güney Salımmı, iklim değişikliği, harmonik analiz, spektral analiz. m ABSTRACT PhD Thesis INFLUENCES OF EL NINO AND LA NINA EVENTS ON STREAMFLOW AND PRECIPITATION PATTERNS IN TURKEY M. Çağatay KARABÖRK Selçuk University Graduate School of Natural and Applied Sciences Department of Civil Engineering Supervisor : Assoc. Prof. Dr. Ercan KAHYA 2000, 110 Pages Jury : Prof. Dr. A. Ünal Sorman Prof. Dr. Tülay Özbek Assoc. Prof. Dr. Nizamettin Çiftçi Assoc. Prof. Dr. Ercan Kahya Assoc. Prof. Dr. Ali Berktay Temporal climatic anomalies which are observed throughout the world are in relation with El Nino and La Nina events, the extreme phases of Southern Oscillation, originally appearing in equatorial Pacific Ocean. El Nino and La Nina events related temporal climatic variations and their impacts on precipitation and streamflow patterns have been fairly documented with a great number of global and regional scale studies especially since early 1980's. Nevertheless, the effects of these extreme events on Turkey's precipitation and streamflow patterns have not been revealed yet. In this study, by using monthly mean streamflows from 76 stramflow gauging stations and monthly precipitation totals from 94 gauging stations, the influences of El Nino and La Nina events on Turkey's precipitation and streamflow patterns have been examined in detail and thus the magnitudes, phases and geographic extents of these atmospheric forcings were determined. The first harmonics extracted from 24 months composites of stations were assumed to be the responses of the hydrometeorological parameters to El Nino and La Nina events. The candidate regions were identified by the vectorial display of these harmonics on a map and then coherent regions were determined by analyzing the temporal coherence of El Nino and La Nina related signals. The statistical significance of the relationships between precipitation and streamflow anomalies and the extreme phases of Southern Oscillation were quantified by a hypergeometric distribution model. As the results of these analyses, for El Nino events two regions which are separately located in the east and west part of Turkey were identified having El Nino related wet seasons for both precipitation and streamflow anomalies. For La Nina events, only one region located in eastern Turkey having a consistent La Nina related dry season was found out for both precipitation and streamflow anomalies. Modular time series of coherent regions were subjected to spectral analysis and some harmonics with El Nino related periods were considered statistically significant and to be an extra confirmation. Keywords : El Nino, La Nina, ENSO, precipitation, streamflow, Southern Oscillation, climatic variability, harmonic analysis, spectral analysis. iv 110
- Published
- 2000
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