导流屏可有效地防止床沙进入引水口。导流屏产生的环流改变河床剪切力的大小和方向，使其影响范围内的水沙重新分布：表层清水流向引水口，底层浑水流向河槽。通过对设置导流屏前后河床地形的比较，对其性能作了评价。运用了早期开发的数学模型的设计准测，这些准则仅适用于引水口流速很小，在引水口前抽水对流速改变不大的情况。 Diversion screen can effectively prevent bed sand into the water inlet. Circulation flow generated by the diversion screen changes the size and direction of the river bed shear force to redistribute the water and sediment in the affected area. The surface water flows to the water inlet and the bottom muddy water flows to the river channel. By comparing the topography of the river bed before and after the setting of the guide screen, its performance was evaluated. Using the early development of the mathematical model of the design criteria, these guidelines apply only to the nozzle flow velocity is very small, pumping in the water before the change on the flow rate is not the case.