| 潮汐汊口水流结构和动力特性研究 |
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| 引用本文： | 吴尧,张蔚,何用,卢陈,吴门伍.潮汐汊口水流结构和动力特性研究[J].海洋通报,2019,38(2):186-193. |
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| 作者姓名： | 吴尧 张蔚 何用 卢陈 吴门伍 |
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| 作者单位： | 珠江水利委员会珠江水利科学研究院 水利部珠江河口动力学及伴生过程调控重点实验室,广东 广州 510611;河海大学 水文水资源与水利工程科学国家重点实验室,江苏 南京 210098;河海大学 水文水资源与水利工程科学国家重点实验室,江苏 南京,210098;珠江水利委员会珠江水利科学研究院 水利部珠江河口动力学及伴生过程调控重点实验室,广东 广州,510611 |
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| 基金项目： | 国家自然科学基金 ( 51779280 )；水利部珠江河口动力学及伴生过程调控重点实验室开放研究基金 （[2017] KJ04）；长江科学院开放研究基金 （CKWV2017499/KY） |
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| 摘 要： | 潮汐汊口作为河网的重要单元,关系到水沙以及可溶污染物、营养物质的输运和分配,对河口三角洲的水文过程、地貌沉积和生态环境,都有至关重要的影响。本文选取国内最大的珠江河网的分汊顶点-马口、三水分汊,基于一个大潮潮周期内走航ADCP测量,分析潮汐汊口各个支汊的流速过程及三维流速的时空分布特征;结合非稳态的调和分析算法和小波连续变换确定汊口处主要的潮汐组分,利用潮流分离技术,剥离出占主导作用的潮波信号并探讨潮波动力在潮汐汊口处的空间分布形态。研究发现,由于潮波在西江马口和北江三水汊道内传播的不对称性,两汊间的流速过程存在1.5 h左右的相位差。而连接西北江的岗根汊道,由于存在频繁的水体交换和弯道水流的特性,岗根断面的动力作用较为复杂,其最大垂向平均流速在涨落急时刻分别向左、右岸偏移,横向断面均出现了显著的顺时针二次流。
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| 关 键 词： | 潮汐汊口 动力作用 潮流分离 二次流 珠江河口 |
| 收稿时间： | 2018/4/25 0:00:00 |
| 修稿时间： | 2018/6/9 0:00:00 |
Characterizing the flow structure and hydrodynamic pattern of the tidal junction |
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| WU Yao,ZHANG Wei,HE Yong,LU Chen and WU Men-wu.Characterizing the flow structure and hydrodynamic pattern of the tidal junction[J].Marine Science Bulletin,2019,38(2):186-193. |
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| Authors: | WU Yao ZHANG Wei HE Yong LU Chen and WU Men-wu |
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| Institution: | Key Laboratory of the Pearl River Estuarine Dynamics and Associated Process Regulation, Ministry of the Water Resources, Pearl River Hydraulic Research Institute, Pearl River Water Resources Commission, Guangzhou 510611, China; State Key Laboratory of HydrologyWater Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China,State Key Laboratory of HydrologyWater Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China,Key Laboratory of the Pearl River Estuarine Dynamics and Associated Process Regulation, Ministry of the Water Resources, Pearl River Hydraulic Research Institute, Pearl River Water Resources Commission, Guangzhou 510611, China; State Key Laboratory of HydrologyWater Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China,Key Laboratory of the Pearl River Estuarine Dynamics and Associated Process Regulation, Ministry of the Water Resources, Pearl River Hydraulic Research Institute, Pearl River Water Resources Commission, Guangzhou 510611, China; State Key Laboratory of HydrologyWater Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China and Key Laboratory of the Pearl River Estuarine Dynamics and Associated Process Regulation, Ministry of the Water Resources, Pearl River Hydraulic Research Institute, Pearl River Water Resources Commission, Guangzhou 510611, China; State Key Laboratory of HydrologyWater Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China |
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| Abstract: | Tidal junction, as the fundamental unit of river network, is highly relevant to the transport and distribution of flow,sediment and soluble pollutants and nutrients. It plays an important role in ecological environment, hydrologic and depositional process of estuarine region. Based on the intra-tidal boat-mounted ADCP survey on the bifurcation of the Pearl River Network, the velocity process and spatial-temporal distribution of velocity were analyzed. The main tidal constitution was explored by NS Tide procedure and continuous wavelet analysis. The tidal constitution, furthermore, was separated from the flow signal. The results found that the velocity process in Sanshui lagged is about 1.5 h later than Makou due to asymmetry transport of tidal wave. Besides, the Ganggen tributary, the connecting channel of West and North River, displayed more complicated hydrodynamic characteristics due to frequent exchange of flow and curved channel. The maximum verticalintegration velocity tended to present at the left and right bank on the flood and ebb tide respectively. The cross-sectional distribution of flow structure at Ganggen displayed significant clockwise secondary flow at both flood and ebb tide. |
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| Keywords: | tidal junction hydrodynamic factors tidal flow separation secondary flow Pearl River Estuary |
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