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