Saturday Aug 18, 2018

Sediment Transport and Shoreline Changes

The shoreline changes examining in the project area and specially under the effect of the human activities in this area and implementing several projects, is one of the most important several projects is one of the most important parts of the coastal engineering studies and it can be the abstract of many of the hydrodynamic and sediment studies in the planning area. This importance in addition to the complexities governing these changes process. Require the utilization of all the present information concluding: aerial images satellite images, and hydrographic information with the mathematics simulation. So, the studies lead to appropriate, real and useful engineering results.
Alongshore sediment transport rate computation
Shoreline changes have a complicated process. The main cause of these changes is sediment transport in the shoreline area. The differences of sediment transportation power between two points cause the sediments erosion or deposit and so the shoreline moving forward and backward. Different hydrodynamic factors are involved in this area. Long shore sediment transport take place in the breaking area which is rather shallow and the long shore currents and waves have the most important effects in this area. Other currents like tidal currents or the currents due to the wind have fewer effects because of the shallow water in the waves breaking zone. So, the model used for the shoreline changes simulation as the first step must be able to compute the sediment transport due to the waves effects and capable of considering other currents, if needed. The long shore sediment transport rate is usually presented as annual transferred sediment volume, but we should note that the rate value in the shorter time can be variable, so that this value is manifold the annual average rate through a storm and becomes close to zone when the encountering wave heights is small. The seasonal changes (mostly summer changes against winter) aspect of the rate and direction.

  

موقعیت برداشت پروفیل‌های عمود بر ساحل و نمونه‌های رسوب بستر در فاز 2 

The surveying location of the profiles perpendicular to the coast and the bed sediment samples in second phase  

موقعیت برداشت نمونه های رسوبی در راستای یک پروفیل  

The sediment samples taking location along a profile

 

 


Last Update : Mar 14, 2012 08:36