What is the relationship between bell mouth in Bangladesh and storm surge flood? Is there any aggravating effect?

The bell-shaped harbor in Bangladesh will aggravate the intensity of storm surge and surrounding floods. The trumpet-shaped entrance has a large volume in the front and a small volume in the back, so there is more water in the front, and this amount of water can't be accommodated in the back, so the high tide level can only be piled up, which makes the tide surge, destroys the moisture-proof seawall and causes floods in the surrounding areas.