The main goal of the study was to find ways to lower the Tongguan riverbed in order to control sediment buildup and channel shrinkage in the lower Weihe River. The researchers used various methods such as trapping sediment, diverting muddy flow, and adjusting the operation of the Sanmenxia reservoir. They found that lowering the water level in the reservoir during flood and non-flood periods was an effective way to address the issue. Overall, enhancing soil and water conservation measures was crucial in resolving the rising riverbed and channel shrinkage problems in the area.