长江口徐六泾站垂线含沙量代表层研究
Representative layer of vertical mean sediment concentration at Xuliujing Station of Yangtze River Estuary
姜璇 1闻卫东 2支远哲 3刘传杰 2邵宇阳1
作者信息
- 1. 河海大学 港口海岸与近海工程学院,江苏 南京 210024
- 2. 长江水利委员会水文局 长江口水文水资源勘测局,上海 200136
- 3. 河海大学 水科学研究院,江苏 南京 210024
- 折叠
摘要
在水深大、交通繁忙而无法开展传统六层采样测量的情况下,如何获取更为准确的垂线平均含沙量进而提升入海泥沙通量的测量精度是当前学者关注的重点.以长江口入海观测关键节点——徐六泾水文断面为例,采用多种分层组合的方法计算垂线平均含沙量,运用置信区间、平均相对误差以及Lilliefors假设检验等统计方法进行计算与分析;同时,结合观测节点上下游水文断面数据,分析了垂线平均含沙量代表层的表征规律.研究结果表明:虽然徐六泾水文断面受到径-潮流相互作用,但 0.6H层被证实是最佳的垂线平均含沙量代表层,其平均相对误差均值在(0±5)%范围内;然而在下游南支河段,白茆沙水文断面受潮汐动力的影响显著增大,从而导致0.6H单层代表性较差.研究成果对未来水文综合浮标改造和准确获取长江入海泥沙通量具有重要指导意义.
Abstract
For estuaries of big rivers with large water depth and heavy traffic,it is impossible to carry out traditional six-layer sampling measurement for sediment concentration.How to obtain more accurate vertical average sediment concentration and im-prove the measurement accuracy of sediment flux into the sea is the focus of current scholars.Taking the Xuliujing hydrological corss-section as an example,a key node of the Yangtze River Estuary,the average sediment concentration of the vertical line was calculated by a variety of hierarchical combination methods,and the confidence interval,average relative error and Lilliefors hy-pothesis test were used for calculation and analysis.At the same time,combined with the upstream and downstream hydrological corss-sections data of the observation node,the characterization law of the vertical average sediment concentration representative layer was preliminarily clarified.It was found that although the Xuliujing hydrological cross-section is affected by the runoff-tide interaction,the 0.6H layer was proved to be the best representative layer,and the average relative error of the observation re-sults was in the range of(0±5)%.However,in the south branch of the lower reaches,the hydrological cross-section of Baim-aosha was significantly affected by tidal dynamics,resulting in poor representation of 0.6H single layer.The research results have important guiding significance for the future transformation of hydrological integrated buoys and the accurate acquisition of sedi-ment flux from the Changjiang River to the sea.
关键词
含沙量/代表层/Lilliefors假设检验/误差分析/徐六泾水文断面/长江口Key words
sediment concentration/representative layer/Lilliefors hypothesis testing/error analysis/Xuliujing hydrological cross-section/Yangtze River Estuary引用本文复制引用
基金项目
国家自然科学基金联合基金重点项目(U2040203)
上海市水务局科研项目(沪水科2020-02)
出版年
2024
国家科技期刊平台
NSTL
万方数据