Ahmed Seif - Academia.edu (original) (raw)
Papers by Ahmed Seif
Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering), 2010
This study is concerned with the development of a 3D morphodynamic model for considering wave-cur... more This study is concerned with the development of a 3D morphodynamic model for considering wave-current interaction. The wave action conservation equation for waves and the quasi-3 D nearshore current model with the surface roller model were employed. Firstly, in order to investigate the influence of the interaction into the morphodynamics, three model tests associated with a detached breakwater, submerged breakwater and sand bars with rip-channel were carried out. Secondly, the presented model was applied to the beach evolution after offshore nourishment, so called "shoreface nourishment", conducted at the Egmond coast in the Netherland. From the model tests and the comparison with the field measurement, the validity of the presented model was founded.
In This study develops a quasi-three dimensional numerical model of wave driven coastal currents ... more In This study develops a quasi-three dimensional numerical model of wave driven coastal currents with accounting the effects of the wave-current interaction and the surface rollers. In the wave model, the current effects on wave breaking and energy dissipation are taken into account as well as the wave diffraction effect. The surface roller associated with wave breaking was modeled based on a modification of the equations by Dally and Brown (1995) and Larson and Kraus (2002). Furthermore, the quasi-three dimensional model, which based on Navier-Stokes equations, was modified in association with the surface roller effect, and solved using frictional step method. The model was validated by data sets obtained during experiments on the Large Scale Sediment Transport Facility (LSTF) basin and the Hazaki Oceanographical Research Station (HORS). Then, a model test against detached breakwater was carried out to investigate the performance of the model around coastal structures. Finally, the model was applied to Akasaki port to verify the hydrodynamics around coastal structures. Good agreements between computations and measurements were obtained with regard to the cross-shore variation in waves and currents in nearshore and surf zone.
Proceedings of the 3rd ICEENG Conference, May 1, 2002
ABSTRACT: In this work, we present a hardware implementation of the encryption algorithm YAEA. Th... more ABSTRACT: In this work, we present a hardware implementation of the encryption algorithm YAEA. The basic notion behind this encryption technique is a sequential search in a random binary file for an octet that represents the ASCII number of the plain-text character. Recording the location of this octet, one is able to assemble a file of near or far pointers to the locations of various octets. Rather inaccurately, we call this file the ciphered text. However, this file contains only pointers to the locations of the searched octets. Since ...
Place Branding and Public Diplomacy, 2009
... Library of Congress Cataloging-in-Publication Data Wilford, Hugh, 1965 The mighty wurlitzer ... more ... Library of Congress Cataloging-in-Publication Data Wilford, Hugh, 1965 The mighty wurlitzer : how the CIA played America / Hugh Wilford. p. cm. Includes bibliographical references and index. ISBN 978-0-674-02681-0 (cloth : alk. ... Page 6. For Patty Page 7. Page 8. ...
Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering), 2010
This study is concerned with the development of a 3D morphodynamic model for considering wave-cur... more This study is concerned with the development of a 3D morphodynamic model for considering wave-current interaction. The wave action conservation equation for waves and the quasi-3 D nearshore current model with the surface roller model were employed. Firstly, in order to investigate the influence of the interaction into the morphodynamics, three model tests associated with a detached breakwater, submerged breakwater and sand bars with rip-channel were carried out. Secondly, the presented model was applied to the beach evolution after offshore nourishment, so called "shoreface nourishment", conducted at the Egmond coast in the Netherland. From the model tests and the comparison with the field measurement, the validity of the presented model was founded.
In This study develops a quasi-three dimensional numerical model of wave driven coastal currents ... more In This study develops a quasi-three dimensional numerical model of wave driven coastal currents with accounting the effects of the wave-current interaction and the surface rollers. In the wave model, the current effects on wave breaking and energy dissipation are taken into account as well as the wave diffraction effect. The surface roller associated with wave breaking was modeled based on a modification of the equations by Dally and Brown (1995) and Larson and Kraus (2002). Furthermore, the quasi-three dimensional model, which based on Navier-Stokes equations, was modified in association with the surface roller effect, and solved using frictional step method. The model was validated by data sets obtained during experiments on the Large Scale Sediment Transport Facility (LSTF) basin and the Hazaki Oceanographical Research Station (HORS). Then, a model test against detached breakwater was carried out to investigate the performance of the model around coastal structures. Finally, the model was applied to Akasaki port to verify the hydrodynamics around coastal structures. Good agreements between computations and measurements were obtained with regard to the cross-shore variation in waves and currents in nearshore and surf zone.
Proceedings of the 3rd ICEENG Conference, May 1, 2002
ABSTRACT: In this work, we present a hardware implementation of the encryption algorithm YAEA. Th... more ABSTRACT: In this work, we present a hardware implementation of the encryption algorithm YAEA. The basic notion behind this encryption technique is a sequential search in a random binary file for an octet that represents the ASCII number of the plain-text character. Recording the location of this octet, one is able to assemble a file of near or far pointers to the locations of various octets. Rather inaccurately, we call this file the ciphered text. However, this file contains only pointers to the locations of the searched octets. Since ...
Place Branding and Public Diplomacy, 2009
... Library of Congress Cataloging-in-Publication Data Wilford, Hugh, 1965 The mighty wurlitzer ... more ... Library of Congress Cataloging-in-Publication Data Wilford, Hugh, 1965 The mighty wurlitzer : how the CIA played America / Hugh Wilford. p. cm. Includes bibliographical references and index. ISBN 978-0-674-02681-0 (cloth : alk. ... Page 6. For Patty Page 7. Page 8. ...