Investigation of Tentative Model’s of Sediment Transport at Lengeh Port
Kamran
Lari
Associate Professor, Islamic Azad University, Tehran North Branch
author
Mohammad Taghi
Sadatipour
Assistant Professor, Islamic Azad University, Tehran North Branch
author
Mostafa
Mamaghani
MSc in Oceanic and Marine Science-Hydrography, Islamic Azad University, Tehran North Branch
author
text
article
2016
per
One of the important problems in ports is sedimentation in access channels and variations of coastline and sea bed, So that dredging for the optimal use of port has considerable price. One of the most important problems in coastal engineering is sediment transportation; because of some times the lack of residual materials show the existence of erosion in the region and in other points association of sediment indicates sedimentation. In this research at the first by comparing of Aerial imagery, coastline variations in Lengeh Port has been evaluated and then using LITPACK software related to DHI, using wave and current data and grading scales of sediments, coastline variation has been simulated and sedimentation in regional of study has been calculated. Results indicate that variation of coastline of Lengeh port in recent is very low and this condition is deposited in accordance with the sedimentary meager resources available in the region.
Hydrophysics
Malek Ashtar university of technology
2476-7131
2
v.
2
no.
2016
1
13
https://www.hydrophysics.ir/article_30767_f6d2ea7ed9e91a3fdddb216a5646705d.pdf
Analyzing Water Flux Parameter within the Strait of Hormuz Using MIKE21 Numerical Model
Seyed Hossein
Hassantabar bozrodi
PhD Student in Physical Oceanography, Hormozgan university, Bandar Abbas
author
Mohammad Reza
khalilabadi
Malek-Ashtar University of Technology
author
text
article
2018
per
In areas such as the Strait of Hormuz analyzing the water flux is of great importance since in these areas subsurface currents can cause flux movement which in turn can cause lots of problems in marine transportation especially in submarine navy. In this study water current characteristic and flux parameters ( (are analyzed in the area of the Strait of Hormuz using HD module. For this purpose, current characteristic within the area was simulated using Mike21 numerical model. The results show that water flux component along the Strait of Hormuz (P component) changes within the range of -1.4 to 0.6 m^3/(s⁄m) and the water flux component along the width of the strait of Hormuz (Q component) changes within the range of -0.6 to 0.5 m^3/(s⁄m). In general, the results of this study show that since the P component is related to surface velocity, this component will decrease and the subsurface flux will increase if the surface velocity decreases. Designing such patterns (pattern of water flux) is crucial in navy, drawing naval maps, and drawing submarine subsurface maps.
Hydrophysics
Malek Ashtar university of technology
2476-7131
2
v.
2
no.
2018
15
26
https://www.hydrophysics.ir/article_30768_aa16c3947be25ae80a12cf0035a416ca.pdf
Wind Effect on Changes of Density in a Theoretical Oceanic Model with Non-Level Bottom
zohreh
heidari nesheli
Ph.D Student in Physical Oceanography, Khoramshahr Marine Science and Technology University, Khoramshahr
author
Mohammad Taghi
Zamanian
University professor , Khoramshahr Marine Science and Technology University, Khoramshahr
author
Masoud
Sadrinasab
Associate Professor, Coastal Engineering Department, Faculty of Environment, University of Tehran
author
text
article
2018
per
The subject of this study is 3D modeling of density changes and double diffusion of salinity and temperature in a marine rectangular basin with closed boundaries and none-level bottom on longitude: 47º to 58º E and latitude: 24º to 30º N. In the area of the study every horizontal layer has regular mesh grid points. In this study the lattice that is applied is modified Arakawa C lattice and spatial grid distance in both east and north is equal to 0.5º and in vertical with respect to type of vertical coordinate, it is equal to 0.1 in sigma scale. Distance of grids is considered as long as 0.5-degree Longitude and Latitude. It is considered in 5 layers in spherical coordinate with sigma vertical component. In order to Numerical calculation of every parameter used in governing equations, equation should be discretize by special mathematical scheme, and wind blow is considered steady all over basin surface during the 4 days. Results show quality of changes in diffusion of temperature and salinity of each layer along longitude and latitude.
Hydrophysics
Malek Ashtar university of technology
2476-7131
2
v.
2
no.
2018
27
40
https://www.hydrophysics.ir/article_30773_c0bbf63575f4fff188d7c5a286e5478f.pdf
Analytical Modeling of Flexible Wave Energy Conversion Carpet in Persian Gulf Conditions
Aref Hossein
Moalemi
BSc student, Faculty of Marine Technology, Amirkabir University of Technology
author
Mohammad Javad
Ketabdari
Associate Professor, Faculty of Marine Technology, Amirkabir University of Technology
author
text
article
2018
per
So far, various methods for extracting wave energy have been developed. However, most of these methods have low efficiency in shallow waters and for the small wave amplitude. The mud of the seabed is able to absorb a significant portion of wave energy in different wave lengths. In this paper inspired by this natural characteristic, the idea of a new wave energy converter with the ability to work with high efficiency in shallow water is proposed. If close to the coast, the sea floor is covered by the converter, a significant proportion of wave energy can be absorbed. The main component of this carpet of wave energy converter (CWEC) is a flexible and visco-elastic plate. In this paper, first, by using an analytical modeling, wave energy absorption capability in different sea states of Persian Gulf was considered and compared with other wave energy converters. Further investigations revealed that because of the high efficiency of this converter in shallow waters, it can be suitable for application in the Persian Gulf. Then, the new idea of using piezoelectric elements in the CWEC device was designed to increase its efficiency. The results show that the piezoelectric combined with CWEC could significantly increase the efficiency of this energy converter device.
Hydrophysics
Malek Ashtar university of technology
2476-7131
2
v.
2
no.
2018
41
50
https://www.hydrophysics.ir/article_30770_ff988c293a64fd9614539a0b2643f032.pdf
The Investigation of the Elastic and Piezoelectric Properties of SrHfO3 and the Effect of Uniaxial Stress on its Piezoelectric Properties: an ab initio study
Hossein
Shahmirzaee
Assistant Professor, Malek-Ashtar University of Technology
author
Majid
Afshari
Assistant Professor, Farhangian University, Isfahan
author
text
article
2018
per
The basic principles of calculations in the framework of density functional theory and density functional perturbation theory were used to investigate the elastic and piezoelectric properties of hypothetical SrHfO3 compound in tetragonal structure with P4mm space group. Polarization and Born effective charges tensor were calculated to investigate the nature of ferro-electricity of this system in an atomic scale. Our results show that Born effective charges of both Hf and O atoms are much larger than their anticipated nominal charges which show a strong bonding between Hf and O atoms. Formation energy calculation revealed that the compound will be stable, if it is synthesized and would not decompose to its ingredients. Non-vanishing and significant calculated piezoelectric constants imply system piezoelectricity. The effect of uniaxial stress along the c-axis on polarization, Born effective charges and piezoelectric stress and strain coefficients were also investigated. We found that the polarization increases as the uniaxial stress goes from negative to positive. These changes suggest that the uniaxial tensile stress could raise the ferro-electricity, while the uniaxial compressive stress would cancel it. We also found that the piezoelectricity of this system could be improved by applying stress. These results could be significant in the field of lead free piezoelectric materials.
Hydrophysics
Malek Ashtar university of technology
2476-7131
2
v.
2
no.
2018
51
65
https://www.hydrophysics.ir/article_30771_309438c4e0ae2ea6d670b7cab9b86801.pdf
Investigation on the Seasonal Variations of Tidal Constituents in the North Coasts of Persian Gulf and Oman Sea
Marjam
Mashayekhpour
MSc in Hydrography, Islamic Azad University, Tehran North Branch
author
Rouhollah
Emadi
Assistant Professor, Islamic Azad University, South Tehran Branch
author
Massoud
Torabi Azad
Associate Professor, Islamic Azad University, Tehran North Branch
author
text
article
2018
per
The main purpose of this paper is to examine the monthly change of main constituents of tide in the northern coast of Persian Gulf and Oman Sea. So the coastal tide gauge data in the port of Bushehr, Jask and Chabahar is used. Duration of tide gauge data collection stations from the sea surface height is listed by about 24, 6 and 7 years. By analyzing the data monthly of tide, the tidal constituents of M2, S2, K1 and O1 were obtained separately for each month. Results obtained show that, the greatest tidal range is for lunar semi diurnal component (M2) about 72 cm in Jask. However, the main constituents of the monthly changes are for K1 with a range of about 30 centimeters. As well as for other constituents such as S2, O1 and M2 to the monthly change in values of 18, 11 and 9 cm are obtained.
Hydrophysics
Malek Ashtar university of technology
2476-7131
2
v.
2
no.
2018
67
77
https://www.hydrophysics.ir/article_30774_a4a4334e5ce527c9268cf436ece1e952.pdf
Field Investigation on Distribution of Suspended Sediment and Bed Grin Size on Tiab Estuary during One Tidal Cycle
Maryam
Rahbani
Assistant professor in Physical Oceanography, Department of Marine Science and Technology, University of Hormozgan
author
Masoud
Ranjbari
MSc Student in Physical Oceanography, Department of Marine Science and Technology, University of Hormozgan
author
Danial
Ghaderi
MSc Student in Marine Transportation Engineering, AmirKabir University of Technology
author
text
article
2018
per
Hydrophysics
Malek Ashtar university of technology
2476-7131
2
v.
2
no.
2018
79
89
https://www.hydrophysics.ir/article_30772_2873d01b9d43626efaeda4be784ce0f2.pdf
Alongshore Sediment Transport Rate Estimation by an Artificial Neural Network (ANN) Model
Tayeb
Sadeghifar
Graduate MSc, Department of Physical Oceanography, Marine Sciences, Tarbiat Modares University, Noor
author
text
article
2018
per
The estimation of alongshore sediment transport rate (LSTR) is the most important factor in analyzing the amount of erosion or accretion along a coast. In the present research, an LSTR measurement was done at daily intervals using sediment traps in Noor coastal area, north of Iran, from March 21 to June 22, 2012. The existing empirical relations are linear or exponential regressions based on the observations and measurements data. Based on calculations, the yearly average of sediment transport rate is 928.73 (m3/day) for Noor coastal area. One of the most widely used methods for estimating LSTR, which has advantages compared with others, is setting up and application of an artificial neural network (ANNs) and the present study attempts to develop such a model. Different ANNs with different input configurations and transfer functions were examined. The results reveal that usage of the hyperbolic tangent is better than application of the sigmoid as the transfer functioning. Moreover, the ANN with wave breaking height (), surf zone width (W), and alongshore current velocity (V), as inputs and sediment transport rate (Q) as output configures the best model and predicts more reliably, with higher correlation coefficient, R2, of 0.96, the L.S.T.R among others. Using the ANNs model presented in this research, therefore, the sediment transport rate can be estimated with sufficient accuracy.
Hydrophysics
Malek Ashtar university of technology
2476-7131
2
v.
2
no.
2018
91
107
https://www.hydrophysics.ir/article_30775_8a7044a80bc13d7e2ecec271b54258f4.pdf