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    Identifying the role of initial wave parameters on tsunami focusing
    (Springer International Publishing Ag, 2018) Aydin, Baran
    Unexpected local tsunami amplification, which is referred to as tsunami focusing, is attributed to two different mechanisms: bathymetric features of the ocean bottom such as underwater ridges and dipolar shape of the initial wave itself. In this study, we characterize the latter; that is, we explore how amplitude and location of the focusing point vary with certain geometric parameters of the initial wave such as its steepness and crest length. Our results reveal two important features of tsunami focusing: for mild waves maximum wave amplitude increases significantly with transverse length of wave crest, while location of the focusing point is almost invariant. For steep waves, on the other hand, increasing crest length dislocates focusing point significantly, while it causes a rather small increase in wave maximum.
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    MODELING AND COMPUTER SIMULATION OF DRAINAGE, EVAPORATION, AND RUNOFF (DEAR) FROM BARE SOILS
    (Parlar Scientific Publications (P S P), 2020) Aydin, Mehmet; Aydin, Baran; Polat, Veysel
    An improved model and its computer program for Drainage, Evaporation and Runoff (DEaR) from bare soils are presented. The model, which is the successor of the model originally known as E-DiGOR, adequately represents the physical processes important in estimating actual soil evaporation, soil water storage, direct surface runoff, infiltrated rainfall, and subsurface flow. The model is useful for quantifying these components of soil water balance with a few parameters, and for the descriptions and predictions of the past, present and future dynamics if climate data are available. Although the physical credibility of the model is quite high, a consistent set of values suitable for the calculations is required. The input variables of the computer program are climate data (sunshine duration, air-temperature, relative humidity, wind speed, and precipitation) and environmental data/soil properties (albedo, psychrometric constant, latitude, fraction of radiation, height for resistance, tortuosity, average diffusivity for drying soil, volumetric water content at field capacity, air-dry water content, threshold potential, reset threshold, profile depth, initial water content of the profile, porosity, slope gradient, and ratio of saturated hydraulic conductivity to maximum rainfall intensity) to account for specific soil-climate combinations. The computer program developed is a useful tool for a fast and precise simulation, and consists of three modules. The computer program has been developed as a MATLAB (TM) application. The software can be obtained upon request.
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    Modeling and computer simulation of drainage, evaporation, and runoff (dear) from bare soils
    (Parlar Scientific Publications, 2020) Aydin, Mehmet; Aydin, Baran; Polat, Veysel
    An improved model and its computer program for Drainage, Evaporation and Runoff (DEaR) from bare soils are presented. The model, which is the successor of the model originally known as E-DiGOR, adequately represents the physical processes important in estimating actual soil evaporation, soil water storage, direct surface runoff, infiltrated rainfall, and subsurface flow. The model is useful for quantifying these components of soil water balance with a few parameters, and for the descriptions and predictions of the past, present and future dynamics if climate data are available. Although the physical credibility of the model is quite high, a consistent set of values suitable for the calculations is required. The input variables of the computer program are climate data (sunshine duration, air-temperature, relative humidity, wind speed, and precipitation) and environmental data/soil properties (albedo, psychrometric constant, latitude, fraction of radiation, height for resistance, tortuosity, average diffusivity for drying soil, volumetric water content at field capacity, air-dry water content, threshold potential, reset threshold, profile depth, initial water content of the profile, porosity, slope gradient, and ratio of saturated hydraulic conductivity to maximum rainfall intensity) to account for specific soil-climate combinations. The computer program developed is a useful tool for a fast and precise simulation, and consists of three modules. The computer program has been developed as a MATLAB™ application. The software can be obtained upon request. © 2020 Parlar Scientific Publications. All rights reserved.
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    New Analytical Solution for Nonlinear Shallow Water-Wave Equations
    (Springer Basel Ag, 2017) Aydin, Baran; Kanoglu, Utku
    We solve the nonlinear shallow water-wave equations over a linearly sloping beach as an initial-boundary value problem under general initial conditions, i.e., an initial wave profile with and without initial velocity. The methodology presented here is extremely simple and allows a solution in terms of eigenfunction expansion, avoiding integral transform techniques, which sometimes result in singular integrals. We estimate parameters, such as the temporal variations of the shoreline position and the depth-averaged velocity, compare with existing solutions, and observe perfect agreement with substantially less computational effort.
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    On open boundary conditions for long wave equation in the hodograph plane
    (Elsevier, 2020) Aydin, Baran
    We discuss implications of the seaward boundary conditions used in initial-boundary value problem formulation of nonlinear shallow-water wave propagation over a linear slope. We first demonstrate the reflection of wave velocity in the case of Dirichlet condition and that of water elevation in the case of Neumann condition. We then show that linear superposition of the two boundary conditions results in much less reflection at the artificial boundary. We also propose a new boundary condition of mixed type and compare its results with that of the aforementioned conditions. (C) 2020 Elsevier B.V. All rights reserved.
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    Potential tsunami hazard along the southern Turkish coast
    (Elsevier, 2020) Aydin, Baran; Sharghivand, Naeimeh; Bayazitoglu, Ozge
    The aim of this study is to determine the tsunami potential of the southern Turkish coast through hypothetical earthquake scenarios developed for several critical coastal sites in the region. A well-known tsunami numerical model (MOST) is utilized to calculate the run-up and inundation of the subsequent tsunami waves. The coastal regions selected to realize the aim of the study are Akkuyu and Yesilovacik from Mersin and Yumurtalik from Adana, which are chosen for their industrial and environmental importance. Time series of wave amplitudes at these three sites as well as contour plots presenting maximum wave amplitudes within the computational domain are generated for different earthquake moment magnitudes. Results obtained from the numerical model suggest that while earthquakes having magnitude smaller than 7.5 generate weak oscillations, earthquakes with magnitude greater than 7.5 result in significant waves reaching maximum wave height of a few meters at the selected coastal regions. Given the number and the magnitude scale of tsunamigenic earthquakes occurred in the region in the past, the modeling effort here indicates that hazard induced by tectonic tsunamis should seriously be taken into account by both the central and the local government authorities, who are responsible for pre- and post-disaster action planning. This issue is critical for minimizing the damage of a possible tsunami event. The proposed study is hoped to be used as a basis for future tsunami risk maps to be developed for the region.
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    Prediction of landslide tsunami run-up on a plane beach through feature selected MLP-based model
    (Elsevier, 2024) Aydin, Baran; Yaguzluk, Sava; Acikkar, Mustafa
    We proposed new prediction models based on multilayer perceptron (MLP) which successfully predict the maximum run-up of landslide -generated tsunami waves and assess the role of parameters affecting it. The input is approximately 55,0 0 0 rows of data generated through an analytical solution employing slide's cross section, initial submergence, vertical thickness, horizontal length, beach slope angle and the maximum run-up itself, along with its occurrence time. The parameters are first ranked through a feature selection algorithm and six models are constructed for a 9,0 0 0 -row randomly sampled dataset. These MLP-based models led predictions with a minimum Mean Absolute Percentage Error of 1.1% and revealed that vertical slide thickness has the largest impact on the maximum tsunami run-up, whereas beach slope angle has minimal effect. Com parison with existing literature showed the reliability and applicability of the offered models. The methodology introduced here can be suggested as fast and flexible method for prediction of landslide -induced tsunami run-up. (c) 2022 Shanghai Jiaotong University. Published by Elsevier B.V. This is an open access article under the CC BY -NC -ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ )
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    Study on physiochemical structure and in vitro release behaviors of doxycycline-loaded PCL microspheres
    (Wiley, 2015) Aydin, Ozlem; Aydin, Baran; Tezcaner, Aysen; Keskin, Dilek
    This study aimed to develop drug delivery system of doxycycline-loaded polycaprolactone (PCL) microspheres. The investigated microsphere formulation can be considered for local application in bone infections and degenerative joint diseases, which generally require long-term treatments via systemic drugs. PCL-14 kDa and 65 kDa were used in microsphere preparation. Before release, the microspheres were characterized by scanning electron microscopy, differential scanning calorimetry, and X-ray photoelectron spectroscopy. The mean particle size of microspheres was in the range of 74-122 mu m and their drug loadings ranged between 10 and 30%. In vitro release profiles were described using the Higuchi and the Korsmeyer-Peppas equations. Diffusion model was applied to experimental data for estimating diffusion coefficients of microspheres; calculated as between 4.5 x 10(-10) and 9.5 x 10(-10) cm(2)/s. Although long-term release from microspheres of PCL-14 kDa obeyed diffusion model, PCL-65 kDa microspheres showed this tendency only for some period. Modeling studies showed that the drug release mechanism was mainly dependent on loading and molecular weight differences. Release behavior of PCL-65 kDa microspheres, however, might be better represented by derivation of a different equation to model for the total release period. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41768