Hydrodynamic processes and their impact on eutrophication in two distinct types of bays near the Beibu Gulf coast: insight from dual water isotopes

IF 3.4 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research Pub Date : 2026-03-01 Epub Date: 2026-01-05 DOI:10.1016/j.marenvres.2026.107840

Junhui Wu , Ruixue Cao , Qibin Lao , Guangzhe Jin , Xuan Lu , Chunqing Chen , Fajin Chen , Shuwen Zhang

{"title":"Hydrodynamic processes and their impact on eutrophication in two distinct types of bays near the Beibu Gulf coast: insight from dual water isotopes","authors":"Junhui Wu , Ruixue Cao , Qibin Lao , Guangzhe Jin , Xuan Lu , Chunqing Chen , Fajin Chen , Shuwen Zhang","doi":"10.1016/j.marenvres.2026.107840","DOIUrl":null,"url":null,"abstract":"<div><div>Quantitative understanding of hydrodynamic processes and nutrient supply in different types of small bays remains limited. By combining water isotopes, hydrological parameters, and nutrient analysis, our findings revealed that Qinzhou Bay (a bay with multiple riverine inputs) is significantly influenced by coastal diluted water (49 %), while Tieshangang Bay (a bay without riverine input) is mainly influenced by high-salinity seawater outside the bay (61 %) during the early rainy season. However, despite these differences, Tieshangang Bay receives a greater proportion of nutrient supply from diluted water (69–95 %) compared to Qinzhou Bay (58–87 %). This disparity is related with the higher seawater intrusion into the Tieshangang Bay, which creates an internal salinity front that inhibits nutrient diffusion outside the bay. The barrier effect of the front hinders the expansion of terrestrial nutrients out of the bay, and accumulates in the bay, exacerbating the seawater eutrophication in the inner Tieshangang bay. This results in a significantly higher degree of eutrophication in Tieshangang Bay compared to Qinzhou Bay. Our study provides valuable insights into the hydrodynamic processes and their impact on eutrophication in different types of bays, emphasizing the importance of the existence of rivers for nutrient transport in small bays.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"215 ","pages":"Article 107840"},"PeriodicalIF":3.4000,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Marine environmental research","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0141113626000097","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2026/1/5 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}

引用次数: 0

Abstract

Quantitative understanding of hydrodynamic processes and nutrient supply in different types of small bays remains limited. By combining water isotopes, hydrological parameters, and nutrient analysis, our findings revealed that Qinzhou Bay (a bay with multiple riverine inputs) is significantly influenced by coastal diluted water (49 %), while Tieshangang Bay (a bay without riverine input) is mainly influenced by high-salinity seawater outside the bay (61 %) during the early rainy season. However, despite these differences, Tieshangang Bay receives a greater proportion of nutrient supply from diluted water (69–95 %) compared to Qinzhou Bay (58–87 %). This disparity is related with the higher seawater intrusion into the Tieshangang Bay, which creates an internal salinity front that inhibits nutrient diffusion outside the bay. The barrier effect of the front hinders the expansion of terrestrial nutrients out of the bay, and accumulates in the bay, exacerbating the seawater eutrophication in the inner Tieshangang bay. This results in a significantly higher degree of eutrophication in Tieshangang Bay compared to Qinzhou Bay. Our study provides valuable insights into the hydrodynamic processes and their impact on eutrophication in different types of bays, emphasizing the importance of the existence of rivers for nutrient transport in small bays.

查看原文本刊更多论文

北部湾沿岸两种不同类型海湾的水动力过程及其对富营养化的影响：来自双水同位素的见解

对不同类型的小海湾的水动力过程和营养供应的定量理解仍然有限。结合水体同位素、水文参数和养分分析，发现钦州湾（多河流输入的海湾）在雨季早期主要受沿海稀释水的影响（49%），而铁山岗湾（无河流输入的海湾）主要受海湾外高盐度海水的影响（61%）。然而，尽管存在这些差异，铁山岗湾从稀释水中获得的营养供应比例（69 - 95%）比钦州湾（58 - 87%）更高。这种差异与铁山岗湾较高的海水入侵有关，这在内部形成了一个盐度锋，抑制了海湾外的营养物质扩散。前缘的屏障作用阻碍了陆源营养物向海湾外扩展，并在海湾内积聚，加剧了铁山岗湾内海水富营养化。这导致铁山岗湾的富营养化程度明显高于钦州湾。我们的研究为不同类型海湾的水动力过程及其对富营养化的影响提供了有价值的见解，强调了河流存在对小海湾营养物质运输的重要性。

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

Marine environmental research 环境科学-毒理学

CiteScore

5.90

自引率

3.00%

发文量

217

审稿时长

46 days

期刊介绍： Marine Environmental Research publishes original research papers on chemical, physical, and biological interactions in the oceans and coastal waters. The journal serves as a forum for new information on biology, chemistry, and toxicology and syntheses that advance understanding of marine environmental processes. Submission of multidisciplinary studies is encouraged. Studies that utilize experimental approaches to clarify the roles of anthropogenic and natural causes of changes in marine ecosystems are especially welcome, as are those studies that represent new developments of a theoretical or conceptual aspect of marine science. All papers published in this journal are reviewed by qualified peers prior to acceptance and publication. Examples of topics considered to be appropriate for the journal include, but are not limited to, the following: – The extent, persistence, and consequences of change and the recovery from such change in natural marine systems – The biochemical, physiological, and ecological consequences of contaminants to marine organisms and ecosystems – The biogeochemistry of naturally occurring and anthropogenic substances – Models that describe and predict the above processes – Monitoring studies, to the extent that their results provide new information on functional processes – Methodological papers describing improved quantitative techniques for the marine sciences.