浦阳江湄池站洪水位特征分析

Analysis of Flood Water Characteristics of Meichi Station in Puyang River

感潮河段的洪水位既受到上游径流洪峰流量的影响，又受到下游潮水顶托，高水位成因较为复杂。以浙江省浦阳江为例，利用多年实测资料分析了浦阳江湄池站的高水位成因，并利用洪水要素得到湄池站的经验预报方法，再通过建立数学模型研究其高水位关于流量和下游水位变化的敏感性程度。研究成果表明，湄池站洪水位受制于上游诸暨流量以及下游闻家堰水位，两者缺一不可。可根据诸暨站流量以及下游闻家堰水位预报湄池站高水位，误差平均值在0.300 m 左右。当闻家堰水位平均变化0.100 m、诸暨流量为600 ~ 1 500 m3/s 时，湄池站水位平均变化为0.036 m ；当诸暨站流量平均变化100 m3/s、闻家堰水位为6.000 ~ 9.000 m 时，湄池站水位平均变化为0.254 m。

The causes of high water level of tidal rivers are complex,mainly affected by upstream runoff and downstreamtide. This paper is about a study of sensitive analysis method for water level of tidal rivers in the Puyang river of ZhejiangProvince. With the collected data of flood elements,it analyzed the reason of the high water lever of the Meichi station,then got the experience forecast method for the Meichi station by the flood elements. The water level mathematical model,which described the sensitivity of flood water level relating to water flow and tidal level,was established. The researchresults show that :the flood level of Meichi Station was subject to the flow at Zhuji and the water level at Wenjiayan,bothare indispensable. According to the Zhuji flow and the Wenjiayan water level,the average prediction error of Meichi highwater level is 0.300 m. When the Zhuji flow is 600 ~ 1 500 m3/s,if the Wenjiayan water level changes an average of 0.100 m,then the Meichi station water level change is 0.036 m ;when the Wenjiayan water level is 6.000 ~ 9.000 m,if the Zhuji flowchanges an average of 100 m3/s,then the Meichi station water level change is 0.254 m.