Zekâi Sen

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On the basis of the artificial radioactive and heavy metal compositions, factor and cluster analyses are employed to identify the inter-relationship among different variables and their similarity groups. In this paper, 15 physico-chemical variables, including the activities of 137Cs, 90Sr, total alpha, total beta, and concentrations of Fe, Mg, Ca, K, Na,(More)
This paper presents a triple diagram method (TDM) based on the Kriging technique for predicting future lake levels from two antecedent measurements, which are considered as independent variables. The experimental semivariograms (SV) for three lags are obtained, and the most suitable theoretical SV for the three cases is the Gaussian type. Based on these(More)
Scientific consequences are dependent on premisses that are logical propositions of the phenomena concerned. Propositions are verbal and linguistic statements, and at the initial philosophical thinking stage they all include vaguneness and imprecision. As more scientific evidence becomes available either rationally or empirically proposition validity degree(More)
The runoff coefficient, the ratio of total streamflow volume to the total precipitation over a certain area and time, plays a fundamental role in the planning, design and operation of water resources tn a catchment. Most often its long-term global value, especially on an annual basis, ts presented either in a tabular form as a function of vegetation cover,(More)
Accurate prediction of maximumwave runup on breakwaters is a vital issue for determining crest level of coastal structures. In practice, traditional regression-based empirical model, recommended by the ‘‘Coastal Engineering Manual”, as well as the ‘‘Manual on the use of rock in hydraulic engineering”, is widely used. However, use of these approaches brings(More)
Classical time series analysis requires many assumptions such as the normality of data, linearity in the autocorelation coefficient and statistical parameter estimations. It is almost impossible to find all these assumptions applicable in stochastic time series generation or simulation. This paper provides a simple fuzzy-probabilistic method for the time(More)
The classical solid/liquid distribution coefficient, K(d), for radionuclides in water-sediment systems is dependent on many parameters such as flow, geology, pH, acidity, alkalinity, total hardness, radioactivity concentration, etc. in a region. Considerations of all these effects require a regional analysis with an effective methodology, which has been(More)
In any dam siting study in arid regions, rainfall records, runoff measurements and their greatest magnitudes are very important. Unfortunately, the data are scarce and, therefore, empirical approaches and charts obtained from similar regions in other parts of the world are necessary for complete applications. The lack of observed data presents the major(More)