水文测站上下游辅助水位对推流的影响分析

Analyzing the Influence of Auxiliary Water Level in the Upstream and Downstream of Hydrometric Station on Calculating Flows

利用西苕溪港口水文站2015年实测水位、流量和其上、下游水位资料,采用投影寻踪回归分析方法,逐一加入本站和上下游同时水位,分别建立水位与流量的回归关系推求流量。结果表明,随着上下游水位的逐一增加,计算与实测流量的相关系数增大、离差标准差减小;进一步分析还发现,在本站水位流量关系基础上,加入邻近的1个站或2个站的水位时,推流精度提高最为明显。依此,可以通过设立辅助水位实现流量的自动监测和预警。

Based on the measured water level,flow and auxiliary water level data in upstream and downstream of Gangkou Hydrometric Station in Xitiao River in 2015,the projection pursuit regression analysis method is used to establish the relationship between water level and fow in order to calculate fow by adding in turn the same - time water level of the station and in upstream and downstream.The results show that with the increase of upstream and downstream water level one by one,the correlation coeffcient increases,and standard deviation decreases.Further analysis also fnds based on the relationship between water level and fow,the accuracy of calculating fow is obviously improved when the upstream water level or the upstream and downstream water level nearby is considered.According to this,the automatic monitoring and early warning of the fow can be realized by setting up auxiliary water level.