Study on the mechanism of the diversion of flow and sediment in the complex Estuarine River network

IF 1.7 4区 环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES
Haoyan Dong, Zixiao He, Liangwen Jia
{"title":"Study on the mechanism of the diversion of flow and sediment in the complex Estuarine River network","authors":"Haoyan Dong, Zixiao He, Liangwen Jia","doi":"10.1002/rra.4247","DOIUrl":null,"url":null,"abstract":"The anomalous variation in the diversion of flow and sediment at the major bifurcation nodes of the Pearl River network in recent years has been generally recognised and accepted, yet the underlying mechanisms have not been revealed. In this study, a large-scale two-dimensional flow-sediment numerical model of the Pearl River estuary was constructed using the TELEMAC-MASCARET modelling system. Additionally, synchronous field surveys from the dry season of 2016 and wet season of 2017 were used to validate the model. The complex branches system of the Pearl River network was generalised. The theoretical models for calculating the water diversion ratio (WDR) of complex estuarine river networks were proposed. The WDR at each river network node is related to Manning's roughness coefficient, the average cross-sectional water depth, the water surface slope, the length of the branches and the average cross-sectional area from the river network nodes to the main estuary outlets. Specifically, the average cross-sectional water depth is the main driver of the formation of the WDRs at the nodes in the Pearl River network. The sediment SDRs at the primary and secondary lateral branching nodes are significantly higher than the WDRs in the dry season, which explains the uneven distribution of flow and sediment. Sediment mining and reclamation are the main factors that have affected the variation in flow and SDRs in the Pearl River network over recent decades.","PeriodicalId":21513,"journal":{"name":"River Research and Applications","volume":"12 1","pages":""},"PeriodicalIF":1.7000,"publicationDate":"2024-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"River Research and Applications","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1002/rra.4247","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0

Abstract

The anomalous variation in the diversion of flow and sediment at the major bifurcation nodes of the Pearl River network in recent years has been generally recognised and accepted, yet the underlying mechanisms have not been revealed. In this study, a large-scale two-dimensional flow-sediment numerical model of the Pearl River estuary was constructed using the TELEMAC-MASCARET modelling system. Additionally, synchronous field surveys from the dry season of 2016 and wet season of 2017 were used to validate the model. The complex branches system of the Pearl River network was generalised. The theoretical models for calculating the water diversion ratio (WDR) of complex estuarine river networks were proposed. The WDR at each river network node is related to Manning's roughness coefficient, the average cross-sectional water depth, the water surface slope, the length of the branches and the average cross-sectional area from the river network nodes to the main estuary outlets. Specifically, the average cross-sectional water depth is the main driver of the formation of the WDRs at the nodes in the Pearl River network. The sediment SDRs at the primary and secondary lateral branching nodes are significantly higher than the WDRs in the dry season, which explains the uneven distribution of flow and sediment. Sediment mining and reclamation are the main factors that have affected the variation in flow and SDRs in the Pearl River network over recent decades.
研究复杂河口河网的水流和泥沙分流机制
近年来,珠江河网主要分叉节点的流量和泥沙分流异常变化已被普遍认识和接受,但其内在机理尚未揭示。在本研究中,利用 TELEMAC-MASCARET 建模系统构建了珠江河口大规模二维流沙数值模型。此外,还利用 2016 年旱季和 2017 年雨季的同步实地调查对模型进行了验证。对珠江河网的复杂分支系统进行了归纳。提出了计算复杂河口河网引水比(WDR)的理论模型。各河网节点的引水比与曼宁糙率系数、平均断面水深、水面坡度、河网节点至河口主出口的分支长度和平均断面面积有关。具体来说,平均断面水深是珠江河网节点处形成水沙特别衍射的主要驱动因素。在枯水期,一级和二级横向分支节点的泥沙特别提款权明显高于水流特别提款权,这解释了流量和泥沙分布不均的原因。近几十年来,泥沙开采和填海是影响珠江河网流量和径流量变化的主要因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
River Research and Applications
River Research and Applications 环境科学-环境科学
CiteScore
4.60
自引率
9.10%
发文量
158
审稿时长
6 months
期刊介绍: River Research and Applications , previously published as Regulated Rivers: Research and Management (1987-2001), is an international journal dedicated to the promotion of basic and applied scientific research on rivers. The journal publishes original scientific and technical papers on biological, ecological, geomorphological, hydrological, engineering and geographical aspects related to rivers in both the developed and developing world. Papers showing how basic studies and new science can be of use in applied problems associated with river management, regulation and restoration are encouraged as is interdisciplinary research concerned directly or indirectly with river management problems.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信