The study looked at how the flow of water and suspended particles changes in the Van Uc River estuary in Vietnam during different seasons and tides. They measured water flow, saltiness, and particle size at different points in the estuary. During high-flow seasons, sediment flowed out to sea during neap tides and up the estuary during spring tides. In low-flow seasons, the estuary became more stratified with salty water moving in and sediment flowing up the estuary, especially during spring tides. The amount and size of particles in the water changed with the tide, with more small particles when the water was saltier. This information can help improve models of how sediment moves in estuaries.