To
CVO
Sub: Clarification to findings related Vigilance report w.r.t the “Study on Siltation and Optimal Ameliorative
Measures at Cochin Port”
Sir,
The findings of the report say the “Capt. Bhaskar K Kunji” should have insisted to modify the model according to
the real conditions of Cochin Port and the matter regarding redundant model should have been brought into the
notice of higher authorities of higher authorities of Cochin Port”
Please note that I was a member 2-member team, who carried out Nautical Depth simulation studies at Flanders
Hydraulic research institute at Antwerp, Belgium. The simulation studies were carried out in two sessions in the
months of May & June of 2016. Prior to beginning of the simulation, the conditions of simulation were discussed
to the pilots based on the science of Nautical Depth concept. The density/Viscosity settings were set by the
institute for safe navigation based on the rheology studies carried out in Cochin by the experts.
The pilots gave various inputs regarding berth layouts, currents, winds, UKC, buoy positions based on their
experience and knowledge to fine tune the simulation model built by the Flanders Institute making it as close to
reality as possible. Various combinations of maneuvers were tried out at different berths with four different
model vessels under different nautical depth conditions. The maneuvers were carried out at 10% UKC, 7% and
10% penetration in the mud. The maneuvers were used to study, maneuverability and were classified on the
basis of efforts required to carry out movement and risk. While performing the maneuvers in the simulation, the
feel we experienced were identical with that of while carrying out actual maneuvers. After every movement, the
pilot who carried out the movement reviewed and comments were registered. With this simulation studies were
useful for us in learning the concept of Nautical Depth. It further made us confident in carrying out the
maneuvers in similar conditions.
I vehemently deny the argument that I did not insist on altering the density set in modelling from 1170 Kg/M
Cub. because the mentioned density corresponds to acceptable level of mud yield strength 30Pa. A simulation
on higher density can validate only maneuverability but not the yield strength. The yield strength is based on
calculations and cannot be validated by the Nautical simulations done by us at the Flanders Hydraulic Research
Institute.
Due to the absence of proper studies, and follow up of Nautical Depth in Cochin Port, the pilots are facing tough
challenges in maneuvering. Due to lack of scientific dredging, often unacceptable forces are exerted on the
vessel’s hull. Often massive tugs use brutal forces on smaller ships due to unscientific dredging practices.
Capt. Bhaskar Krishnan Kunji
Pilot, Cochin Port