徐六泾站潮流量测验测次布置与垂线优化分析应用

Tidal Discharge Measurement Frequency and Verticals Optimization at Xuliujing Gauging Station

徐六泾水文站是长江入海口的控制水文站,其潮流量测验和整编采用代表线法,即以声学多普勒流速仪连续定时测验代表线流速、流向,再以组合代表线流速与相应断面流量间关系推求全断面不同时刻潮流量过程资料。以前阶段断面上共布设有5条代表线,并按季度每年对组合代表线流速与相应断面流量间关系进行4次率定测验。近期随着长江航运业的快速发展,断面上过往船舶数量迅速增加,全盘走航式声学多普勒流速仪测验及代表垂线浮标测流系统安全隐患越来越大,且率定测验工作量巨大,费用昂贵。本文以《水文资料整编规范》为依据,采用误差分析理论,分析将有关测流代表线移至安全位置、减少代表线数及率定测验次数的可行性。结果表明,将2#、3#、4#浮标测流系统移至安全位置及减少二季度率定测验是可行的;采用三组合和四组合两种代表线法推流也基本满足水文测验规范的有关规定。

Xuliujing hydrologic section is the control section of the Yangtze River Estuary,the representative vertical method was adopted for tidal discharge measurement and compilation.The current velocity and direction were measured by ADCP(Acoustic Doppler Current Profiler) continuously and regularly.We calculated the tidal discharge data of the whole section in different time according to the relation of the combined velocity and the corresponding section discharge.There are 5 representative verticals layouted on the section at former stage.And 4 calibration measurements should be accompUshed to get the relation of the combined velocity and the corresponding section discharge every year.With the quick development of Yangtze River shipping industry,the number of the passing vessel increases rapidly on the section,so there are more and more hidden dangers when the hydrological boats cross over the section,and also with the flow remote-measurement system.In addition,the workload of the calibration measurement is very huge and the cost is very expensive.This paper adopted the theory of error analysis based on Code for Hydrologic Data Compilation(SL247-1999) to analyze the feasibility of that moving the representative verticals to the safe position,reducing the number of the representative vertical and calibration measurement.The results show that it is feasible to move 2#,3#,4# float to the safe position and reduce the calibration measurement of the second quarter.It can basically meet the requirement of the code for hydrologic measurement to calculate the discharge by the two methods of the three-vertical and four-vertical combination.