Why aren't marine sediments extremely deep near the vmouth of the Amazon compared to the Mississippi and Megnah River?

The depth of marine sediments near river mouths varies due to several geological and hydrodynamic factors. While the Amazon, Mississippi, and Meghna Rivers all transport substantial fine sediments, the distribution and deposition patterns differ significantly. The Amazon's sediment dispersal is influenced by its vast, low-gradient delta and strong tidal influences, which can hinder sediment accumulation. In contrast, the Mississippi and Meghna have steeper delta slopes and more concentrated sediment transport, leading to deeper sediment deposits.