/pdf/bouss-2d-a-boussinesq-wave-model-for-coastal-regions-and-4iyd0bhkm5.pdf

BOUSS-2D: a boussinesq wave model for coastal regions and harbors, Report 1, Theoretical background and user's manual

The effects of reflection coefficient of the harbour sidewall on the performance of floating breakwaters

On the modeling of wave-current interaction using the elliptic mild-slope wave equation

Modeling wave and spectral characteristics of moored ship motion in Pohang New Harbor under the resonance conditions

A neural network for the prediction of wave reflection from coastal and harbor structures

Waves in a harbour with partially reflecting boundaries

The present paper describes a numerical method for predicting the wave field produced by a segmented wave generator undergoing specified motions in a wave basin which may contain partially reflecting sides. The approach used is based on linear diffraction theory and utilizes a point source representation of the generator segments and any reflecting walls that are present. The method involves the application of a partial reflection boundary condition, which is discussed. Numerical results are presented for the propagating wave field due to specified wave generator motions in a rectangular basin. Cases that are considered include both perfectly absorbing and partially reflecting beaches along the basin sides, as well as the presence of perfectly reflecting short sidewalls near the generator. The method appears able to account adequately for the effects of wave diffraction and partial reflections, and to predict the generated wave field realistically. Key words: coastal engineering, hydrodynamics, laboratory...

Predicted wave field in a laboratory wave basin

A novel dual‐polarized patch antenna array with a hemispherical beam coverage is proposed in this article. The antenna array is composed of four symmetrically arranged units, and each one covers a fourth part of the hemispherical space independently. Two proximity‐coupling feed baluns are adopted in the unit to produce dual‐polarized radiations and enhance the operating bandwidth. A metal cavity beneath the radiating patch reduces the deterioration of the impedance matching caused by the fixture. An antenna array prototype is fabricated and measured for verification purpose. The measured results show that the gain is over 2 dBi within the whole hemispherical space in the frequency band of 4.5–5.1 GHz, while the VSWRs of all ports are below 2.

Dual‐polarized patch antenna array with hemispherical beam coverage

A new approach based artificial electromagnetic materials (AEMMs) with low transmission loss is proposed for phase array scattering cross section (SCS) reduction. By putting an AEMM unit with different transmission phase above a phased array element, a new array element with different scattering phase can be constructed. Then, a low‐SCS array aperture can be synthesized based on the new element by taking advantage of its tunable scattering phase. An 8 × 8 array prototype is fabricated to validate the radiation and scattering characteristics of the proposed low‐SCS phased array. The measured results indicate that its SCS is controlled in the operating bandwidth of the phased array antenna with an acceptable degradation of radiation characteristics.

Shiqin Qu

Papers

Waves in a harbour with partially reflecting boundaries

Predicted wave field in a laboratory wave basin

Dual‐polarized patch antenna array with hemispherical beam coverage

In‐band scattering reduction of phased array by loading artificial electromagnetic materials