Friday Jun 9, 2023

Dredging and Hydrography

Officer: Mr. Saber Kazem Zadeh

Phone Number: 013- 44992757

Hydrography is a branch of practical science that discusses about measuring and describing the physical effects of the seas and other water sources and their adjacent coastal areas and the sea related phenomena like tides, determination of deposition rate and pattern, reorganization of water flows, environment protection and etc. 

The most important and applicable achievement of Hydrographic operations is the preparation of marine maps in order to provide safe movements of vessels in marine zones.

At present, the nature of hydrography is changing and there are some basic changes in its measuring technology. The single and multi-beam echo-sounder systems and air laser system present a complete covering of water source bed compared to the measurements in vector profile echo sounder methods. The capability to generate accurate data about different positions on the earth has increased to a great level by means of satellite positioning systems. Nowadays, we are able to register a great volume of accurate hydrographic data in order to prepare precise maps for engineering and navigation affairs by means of satellite positioning systems and digital electro-acoustic echo sounders.

After the preparation of hydrographic maps in ports and analyzing them, some projects will begin in order to perform dredging operations (deepening or maintaining) to preserve channels' depth and provide safe navigation routs for vessels.

Dredging is the removal of sediments and debris from the bottom of sea, waterways and water ponds which is done by means of various dredging equipment. It might also be done in order to create depth and establish channels or waterways or to increase the depth of basins and water zones. The type of dredging equipment has direct relationship with the type and structure of the waterway bed and also the basic water depth in that zone.

By having Yasin Hyper-Suction dredger with a capacity of 1000 m3 and Shahid Rashidi Cutter-suction dredger with a capacity of 300 m3 per hour and Mohajer grab dredger, Ports and Maritime Authority of Guilan Province is always trying to provide the required depth for the berthing of huge vessels.

The sea level fluctuations are also registered by means of the oldest tide gage application existed in Caspian Sea installed in Anzali Port in 1926. The statistics that are collected daily at 8:00, 12:00 and 18:00 O'clock will be sent to study centers and related organizations at the end of each month.