![]() ![]() For the tests described herein, the layered type of construction was used for both breakwater trunks and breakwater heads. The present report is concerned with the design of rubble-mound breakwaters constructed of rough and smooth quarrystones, quadripods, tetrapods, hexapods, tribars, modified cubes, and truncated tetrahedrons. The first phase of this investigation, which dealt with the design of smooth quarrystone cover layers on breakwater trunks in depths of water sufficient to prevent the breaking of waves due to depth limitation, was described in a previous report by Hudson. The need for fundamental data for use in designing rubble-mound breakwaters led to a laboratory investigation to develop design criteria. Measurements were made to determine the average thickness and percentage of voids for all types of armor units used in this investigation. When the breakwater slope was steepened, wave runup and wave rundown increased when the wave steepness decreased, wave runup and wave rundown increased. In these tests wave heights greater than those corresponding to incipient instability were used. Tests were also conducted in which damage to the cover layers was determined as a function of wave height. The limit of stability of the armor units forming the protective cover layer was determined. The small-scale rubble-mound breakwater sections were hand constructed in concrete flumes 119 ft long, 5 and 12.5 ft wide, and 4 ft deep and subjected to mechanically generated waves. The comparison highlights the accuracy of all three models in predicting the actual condition state of the structures at the year of the single inspection.Design of Cover Layers for Rubble-Mound Breakwaters Subjected to Nonbreaking Waves. The results of the fuzzy deterioration pattern simulation are finally presented and compared against previous work where stochastic Markov-Chains modeling and heuristic Artificial Neural Networks (ANN's) were both used to model the structural deterioration of rubble-mound revetments. Considering that the inspection and condition rating are performed for the first time since the date of construction or the date of the last major repair or maintenance, the past structural deterioration behavior is then used to develop the if-then scenarios of the Fuzzy Expert System Deterioration Module (FESDM), whose output is the predicted deterioration pattern over a 30-years horizon. The following step is the establishment of the Inspection and Condition Rating Module (ICRM), which sets the criteria against which the structural condition of the structure is measured upon visual inspection, and provides a condition score for each structure. The AAD also includes information on previous intervention history pertaining to maintenance, repair and upgrading as well as previous major events such as year of construction and dates of major storms. The first step was the establishment of the Asset Attributes Database (AAD), which divides every structure into distinct structural segments, and comprises the design features and environmental data surrounding each structure. This paper tackles the issue of structural deterioration modeling for rubble mound marine revetments using Fuzzy Logic (FL). Limited research efforts have been allocated to the modeling of structural deterioration of coastal protection structures using modern artificial intelligence tools and techniques. ![]() Structural deterioration prediction for coastal protection assets is a key element towards the establishment of a robust decision-making mechanism for asset management. ![]()
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