沿海平原地势低平,排水河道过流不足,是平原内涝的重要原因。为了减轻沿海平原地区受潮汐、台风、地形等原因造成的内涝,提出在主干排水河道上逐级布置接力泵站,人为加大河道流速,从而达到提高排涝效率的目的,这是一种新的治涝措施。探讨了接力泵站的适用范围、布局和规模、水力计算概化方式等问题,以浙江省姚江流域的余姚市防洪排涝布局作为实例,结果表明:实施“分片节制”、“接力强排”的工程措施,对于排水距离远、水力坡降不足的低洼平原具有非常显著的排涝效果,体现了选取的措施的合理性。接力泵站措施可在有条件的沿海平原治涝工作中加以推广。

The gentle terrain of coastal plain and the insufficient flow of drainage channel are important causes of waterlogging of plain. Arranging multi-stage relay pump stations on the main drainage channel to increase flow velocity in channel and improve drainage efficiency is a novel measure to alleviate waterlogging induced by tide, typhoon, and terrain. In this paper, the application scope, layout, scale, and generalization for hydraulic calculation of relay pump station are discussed. A case study on the flood control and waterlogging drainage in Yuyao City proves that partitioned restraint of flood and relayed intensive drainage are of evident effect in plains of long drainage distance and insufficient hydraulic gradient. Relay pump stations can be promoted in the flood-control work of coastal plains.