This paper presents the results of studies performed to rehabilitate an existing SEAWALL in Fujairah to withstand cyclone Gonu condition. The exiting section has not been designed for the cyclone Gonu condition. A desktop study was implemented to assess the functionality of the existing section by applying the methods recommended in the applicable standards and guidelines. This assessment showed that the existing SEAWALL would be severely damaged and excessively overtopped during the cyclone wave condition. Some measures were implemented for the typical section of the SEAWALL. The proposed improved sections were physical model tested and the results compared with the empirical methods.

SEAWALLs are commonly constructed to prevent landward erosion of the shoreline and to maintain the configuration of the area behind them against wave action. In order to consider the effect of SEAWALLs on surf zone hydrodynamics, experiments have been performed at laboratory model scale on partially reflective SEAWALLs located in the surf zone. The main objectives of these experiments were to undertake a quantitative comparison of near-bed velocities in two cases (i.e. with and without the reflective structure). The presence of a reflective structure and the influence of reflected waves result in significant changes in the mean flow and the near-bed horizontal velocities in the surf zone. The latter is illustrated by comparing the probabilistic properties of velocities measured with and without a reflective structure. In this paper, a semi-empirical approach based on the measured probability density functions of near-bed horizontal velocities, is presented to predict the short-term response of a partially reflective SEAWALL to random wave attack. The results obtained from the model and comparison with the experimental results, which have been reported previously are promising and encouraging for further developments of the preliminary model.

This paper presents an experimental study the influence of wave parameter on the damage of reshaping SEAWALL, model tests have been performed in several water level conditions. The experiments of physical modeling of this research have been done in the flume of the Soil Conservation and Watershed Management Research Institute (SCWMRI). The waves applied to the structure model are irregular and the energy spectrum of the applied waves is JONSWAP. The material of arm our layer have been regarded with the scale of 1: 25 model and grading class of D85/D15=1.82. A number of 3000 waves were applied on the structure over the research in general and some 60 experiments have been totally accomplished. The results of tests after drawing graphs, has been analyzed. That it can be harvested with %82 increasing in wave steepness, damage parameter %85 decreased and also with %57 increasing in wave height, the damage parameter %87 increases and with %57 increasing in wave length, the damage will %83 increase.

One of the most important types of the environmental loading on a SEAWALL is the wave induced force during the storm conditions. In such conditions, free surface of the water has a time dependent irregular pattern which can be described by either a time series or an energy spectrum. The wave induced pressure on a SEAWALL is random in nature and consequently, the internal forces produced in the body of the SEAWALL have a random temporal change. The flexural moment and shearing force are the most important internal forces which can be minimized by selecting an optimum value for the slope of the SEAWALL. In order to find an optimum slope which leads to minimizing the wave induced internal forces, a large number of SEAWALLs have been modeled and analyzed subjected to sea waves, using the FE software package, SACS. Different values have been assigned to the slope of the SEAWALL ranging from –45o to+45o with the increments of 5o. It must be noted that 1° increments have been considered in the critical regions. In order to increase the accuracy of the results, the structure’s weight and the hydrostatic pressure have been considered during the analysis. The results of numerical analysis showed that when the slope is 15o, the flexural moment at the base of the SEAWALL is minimized. Hence, it can be concluded that the optimum value for the slope of the studied SEAWALL is 15° which can be adapted for design purposes.

Quay walls are sheltering structures used for protecting coastal regions against wave-induced forces. Because of the random nature of the wave behavior, the application of physical models for the study of wave-structure interaction can be quite efficient. The aim of this study was to investigate the behavior of quay walls under random waves through experimental methods. The study used walls with vertical geometrical form, which were exposed to sea random waves under the JONSWAP spectrum. Surface level and wall strain values were measured using built-in sensors. A neural network model was developed using the feed-forward method with the backpropagation algorithm to analyze the time series of water surface level and strain. High coefficients of determination during the training and verification phases were observed, indicating good network performance. Self-correlation analysis of the time series showed that the data exhibited first-degree Markov characteristics. This finding was taken into consideration and increased the coefficients of determination in the neural network model.

Although there exist advanced models which predict beach profile for natural beaches, the behavior of the beaches in front of SEAWALLs still suffers from the lack of appropriate theoretical models and sufficient measured data. In this paper, following the results obtained from the measurements, a beach profile evolution model is developed, using the measured probability distribution of the near-bed horizontal velocities as input, to predict the shortterm bed level changes in the vicinity of a partially reflective SEAWALL. The present model introduces a new approach in which based on integrating the probability density functions of the near-bed horizontal velocities, the sediment displacements and consequently bed level changes are calculated in front of a partially reflective structure. The results obtained from the model in comparison with the experiments are promising and encouraging for further developments of the proposed model.