In this study, hydrodynamic modeling and radiotracer investigations were conducted in Kolkata Port Trust, Kolkata, West Bengal, India to investigate the dispersion of sediments and to evaluate the suitability of three different dumping sites (Upper Auckland, Lower Auckland and Eden) for dredged sediments along a navigation channel. Scandium-46 (148-240 GBq) comprising scandium glass powder with a particle size distribution ranging from 75-100 μm was used as a radiotracer. The radiotracer was injected onto the seabed at the selected site using a remotely operated injection system and its movement on the seabed was tracked over a period of three months using waterproof NaI(Tl) scintillation detector. The tracer concentration curves were plotted on a site map of the area for different trackings and isocount contours were plotted. Qualitative information was obtained from the isocount contours such as the general direction of movement and spread of the radiotracer. The isocount contours showed that the sediment predominantly moved away from the navigation channel. From the isocount, a transport diagram was plotted based on isocount counter and sediment transport parameters such as the general direction of movement by sediments on the seabed, transport velocity, transport thickness and bed load movement rate were determined for all the sites. The dispersion patterns obtained for the sediments by modeling were compared with the experimental results and they were found to be similar. Thus, the model results were validated and the proposed sites were found to be suitable for dumping the dredged material because the sediments did not return to the navigation channel.

在这项研究中，在印度西孟加拉邦加尔各答的加尔各答港口信托进行了水动力建模和放射性示踪剂调查，以调查沉积物的分散情况，并评估三个不同的倾倒场（上奥克兰，下奥克兰和伊甸园）对疏ged沉积物的适用性。沿导航频道。使用包含comprising大小分布在75-100μm范围内的powder玻璃粉末的distribution46（148-240GBq）作为放射性示踪剂。使用遥控注入系统将放射性示踪剂注入选定地点的海床上，并使用防水NaI（Tl）闪烁探测器在三个月的时间内跟踪其在海床上的运动。将示踪剂浓度曲线绘制在该区域的站点地图上以进行不同的跟踪，并绘制等值线轮廓。从等值线等高线获取定性信息，例如放射性示踪剂的总体移动方向和传播。等值线等值线表明，沉积物主要远离航道。根据等值线，根据等值线计数器绘制运输图，并确定所有站点的沉积物运输参数，例如海底沉积物的总体移动方向，运输速度，运输厚度和床荷移动速率。通过模拟获得的沉积物分散模式与实验结果进行了比较，发现它们相似。因此，对模型结果进行了验证，发现拟议的地点适合于倾倒挖出的物料，因为沉积物不会返回航道。