{"title":"Effect of monsoonal rainfall and tides on salinity intrusion and mixing dynamics in a macrotidal estuary","authors":"Nay Oo Hlaing, Gubash Azhikodan, Katsuhide Yokoyama","doi":"10.1016/j.marenvres.2024.106791","DOIUrl":null,"url":null,"abstract":"<div><div>Studies on the temporal and spatial variations of estuarine hydrodynamics, particularly those focusing on the combination of extreme and transition periods in the estuary with seasonal fluctuation of discharge, are rarely reported. Due to its importance, this study investigates the effect of rainfall and tide on the salinity intrusion and mixing conditions in the monsoon-affected macrotidal Tanintharyi River estuary (TRE), Myanmar, during the period of 2017–2019. The maximum salinity intrusion and partially mixed to well-mixed conditions were found during the neap-spring tidal cycles of dry seasons. The minimum salinity intrusion, along with partially mixed to stratified conditions, was found during spring to neap tidal cycles of wet seasons. Further, the transitional periods before and after the wet season have different salinity intrusion and mixing conditions based on the different discharge fluctuations in the past months. The salinity intrusion and mixing conditions in the TRE were largely influenced by the lack of rainfall during the dry season, whereas the combined effect of rainfall and the tidal range dominated during the wet season. Finally, the salinity interface gradient (SIG<sub>10</sub>) index was found to be the convenient index to examine the mixing condition of a large area compared to the traditional indices because of the minimum data requirement with easiness of calculation by using the reference figures from the published articles.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":null,"pages":null},"PeriodicalIF":3.0000,"publicationDate":"2024-11-01","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/S0141113624004525","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
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Abstract
Studies on the temporal and spatial variations of estuarine hydrodynamics, particularly those focusing on the combination of extreme and transition periods in the estuary with seasonal fluctuation of discharge, are rarely reported. Due to its importance, this study investigates the effect of rainfall and tide on the salinity intrusion and mixing conditions in the monsoon-affected macrotidal Tanintharyi River estuary (TRE), Myanmar, during the period of 2017–2019. The maximum salinity intrusion and partially mixed to well-mixed conditions were found during the neap-spring tidal cycles of dry seasons. The minimum salinity intrusion, along with partially mixed to stratified conditions, was found during spring to neap tidal cycles of wet seasons. Further, the transitional periods before and after the wet season have different salinity intrusion and mixing conditions based on the different discharge fluctuations in the past months. The salinity intrusion and mixing conditions in the TRE were largely influenced by the lack of rainfall during the dry season, whereas the combined effect of rainfall and the tidal range dominated during the wet season. Finally, the salinity interface gradient (SIG10) index was found to be the convenient index to examine the mixing condition of a large area compared to the traditional indices because of the minimum data requirement with easiness of calculation by using the reference figures from the published articles.
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.
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