Yazar "Marti, Ali Ihsan" seçeneğine göre listele

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    ENSO Effect on Black Sea Precipitation
    (ELSEVIER SCIENCE BV, 2013) Marti, Ali Ihsan
    El Nino Southern Oscillation is one of the most important oceanic-atmospheric events on the world, which sometimes considerably affects the climates of the countries, i.e. the hydrologic parameters of the regions. Hence, the aim of this study was to determine the possible effects of ENSO events on the precipitation data of the Black Sea Region of Turkey by concerning 23 precipitation-recording stations at the Black Sea Region of Turkey. During the analysis, the synthetic monthly precipitation data corresponding to the El Nino years were generated using Feed Forward Back Propagation Artificial Neural Network model and replaced with the original data. In this way, two precipitation data sets for each station (synthetic and original) were obtained in order to compare their statistical parameters (variance, mean, population, autocorrelation) to find out whether the synthetic and the original data differ from each other or not. Consequently, significant El Nino effect was determined for the precipitation data of Turkey's Black Sea Region which should be taken into consideration for long term drinking water, irrigation, environmental planning, energy purposes, etc. This study can be extended for all the countries surrounding the Black Sea to obtain the regions affected from ENSO more precisely in the subsequent studies. (C) 2014 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/).
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    ENSO MODULATIONS ON STREAMFLOW CHARACTERISTICS
    (UNIV NACIONAL DE COLOMBIA, 2010) Marti, Ali Ihsan; Yerdelen, Cahit; Kahya, Ercan
    El Nino Southern Oscillation (ENSO) has been linked to climate and hydrologic anomalies throughout the world. This paper presents how ENSO modulates the basic statistical characteristics of streamflow time series that is assumed to be affected by ENSO. For this we first considered hypothetical series that can be obtained from the original series at each station by assuming non-occurrence of El Nino events in the past. Instead those data belonging to El Nino years were simulated by the Radial Based Artificial Neural Network (RBANN) method. Then we compared these data to the original series to see a significant difference with respect to their basic statistical characteristics (i.e., variance, mean and autocorrelation parameters). Various statistical hypothesis testing methods were used for four different scenarios. Consequently if there exist a significant difference, then it can be inferred that the ENSO events modulate the major statistical characteristics of streamflow series concerned. The results of this research were in good agreement with those of the previous studies.
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    GLOBAL CLIMATE CHANGE WITH ITS REFLECTIONS ON TURKEY
    (INT SCIENTIFIC CONFERENCE SGEM, 2009) Buyukyildiz, Meral; Marti, Ali Ihsan; Yilmaz, Volkan
    The climate change due to global warming is accepted among the greatest environmental problems resulted from the human effects of increasing energy consumption, urbanization and deforestation events threatening the healthy life of people and environment. Many results of the climate change due to global warming can be estimated as the melting of snow covers, terrestrial and sea icebergs, replacement of climate zones, frequent formation of severe weather events, floods that gain strength in time, severe droughts, formation of deserts, increasing epidemic cases and harmful agricultural insects, etc. all of which are very important events directly or indirectly affecting human life, socioeconomic sectors and ecological systems. Global warming is an effective change perceived by people from equator to poles, and from oceans to the highest lands. Since Turkey has a complex climatic structure, it is among the countries that will be mostly affected from the climate change especially due to global warming. Therefore, determining the dimensions of the effects of the global warming on Turkey's climate will provide to estimate and make projections about the climatic changes in the country, since it is necessary for the future plans of water supply, agriculture, flood control, ecology, etc. activities.
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    THE HYDRO-ECOLOGIC EFFECTS OF GLOBAL CLIMATE CHANGES ON THE WORLD
    (INT SCIENTIFIC CONFERENCE SGEM, 2009) Marti, Ali Ihsan; Buyukyildiz, Meral
    Past to present, climate changes take place on every sections of the world during the history. This is an ordinary fact when these changes occur naturally, i.e. the natural climate changes are the necessity of our world's natural behavior, and then the beings on the world are not affected artificially. However, in recent years, some human activities that increase the concentrations of greenhouse gases (GHGs) in the atmosphere and cause global warming are the most effective factors playing great roles on changing the climates of the world. The objective of this study is to present the hydro-ecologic effects of climate changes due to global warming on the hydrologic characteristics of the world in terms of precipitation, streamflow and evaporation those of which are closely related to each other and considerably affect the ecological balance.