Abstract:
International regulatory body (IMO) has recently enhanced the assessment procedure of
vessels’ stability condition by formulating some complementary measures. These additional measures are based on environmental condition of navigational routes and so,
probabilistic. Wind generated surface wave is the main governing parameter of environ
mental condition in inland river routes. Bangladesh inland navigational routes frequently
suffer seasonal strong winds and consequently, surface waves generate. The severity of
wave condition depends on wind velocity, duration and the distance covered by wind.
This study has proposed an environmental condition with wave characteristic parameters
for considering in Bangladesh inland vessel design. The sequential wind wave generations have phases of duration limited, fetch limited and fully developed.--
A previous study proposed the environmental condition of Bangladesh Rivers considering the fetch limited waves. The current study has formulated a more realistic wave
condition by considering duration-limited waves. The understanding behind this modification is that the required wind blowing duration with the considered design velocity (20.83 m/s) for fetch limited waves is not very much practical.--Anumberofwaveforecasting models have been studied and compared. The models pro
posed for fetch limited conditions are used for duration-limited condition by estimating
the equivalent fetch. The governing equation for this estimation is the so-called space
time conversion equation. Existing regulations of river sea vessels as following by other
countries are studied and recommendation is made to follow the regulations for not only
Bangladesh river sea vessels (coastal vessels) but also for inland river vessels.
