چكيده به لاتين
From a long time ago, edible aquatics account for a large share of food basket human needs, such as protein, phosphorus, calcium, iron, omega3, and vitamins. In Iran, the Sixth Development Plan aims to produce 1.6 million tons of aquatic species, of which the share of the sea cage is 800,000 tons. Given that the breeding cages maintain a high tonnage of fish, in order to protect this economic capital, it is necessary to examine the maintenance of cage stability in different conditions. In this thesis, the purpose is to investigate the cause of the movement of fish farms in Kiashahr port. Although the farm has sufficient mooring; during the year, the movement of the total system is still evident. Therefore, to reduce the displacement of the cages, the amount of impact caused by the wave on the anchor with the displacement of the floating buoy was examined.
To evaluate the impact on the anchor, the cage information of Kiashahr port farms and the area wave data were simulated based on the prototype and the geometric scale and Frude ratio with scale 1/8 for geometric dimensions and scale 1/2.82 for time parameters.
To investigate the effect of floating buoy distance on the anchor force, 4 different lengths were considered for buoy distance and, based on 5 different wave heights and sharpness, were tested in the Persian Gulf National Laboratory. To collect the amount of force, three loadcells were used at the connection point of the anchor, buoy, and bracing frame, which were examined as a time series. Moreover, to evaluate the effect of inertial force and drag on Morrison force on the structure, the Clogan-Carpenter number was studied in the modified form by considering the buoy distance from the cage as a dimension of the length of the structure.
By analyzing the time series of the forces on the anchor, it was found that by increasing the height and sharpness of the wave, the force acting on the anchor also increases. Additionally, after comparing with previous research that found that for constant diameter cage and specified wave steepness, increasing wavelength and consequently increasing wave height will increase the force on the anchor. Finally, by dimensionless the data, it was concluded that by decreasing the modified KC, the amount of Π1 increases, which is directly proportional to the force on the anchor. However, in the modified KC, the buoy distance from the cage is at the denominator, and as a result, it can be said that reducing this distance reduces the force on the anchor.
