Effect of monsoonal rainfall and tides on salinity intrusion and mixing dynamics in a macrotidal estuary

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

Marine environmental research Pub Date : 2024-11-01 DOI:10.1016/j.marenvres.2024.106791

Nay Oo Hlaing, Gubash Azhikodan, Katsuhide Yokoyama

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引用次数: 0

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.

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季风降雨和潮汐对大潮河口盐度入侵和混合动力学的影响

有关河口水动力时空变化的研究，特别是有关河口极端时期和过渡时期与季节性排水量波动相结合的研究很少见报道。鉴于其重要性，本研究调查了 2017-2019 年期间降雨和潮汐对缅甸受季风影响的大潮汐丹林达里河口（Tanintharyi River Estuary，TRE）盐度入侵和混合状况的影响。在旱季的新春潮汐周期，盐度入侵最大，部分混合至混合良好。而在雨季的春季至次年的潮汐周期中，盐度入侵和部分混合至分层条件最小。此外，根据过去几个月不同的排水量波动情况，雨季前后的过渡时期具有不同的盐度入侵和混合状况。在旱季，TRE 的盐度入侵和混合状况主要受降雨量不足的影响，而在雨季，降雨量和潮差的综合影响则占主导地位。最后，与传统的指数相比，盐度界面梯度（SIG10）指数被认为是便于考察大面积混合状况的指数，因为它对数据的要求最低，而且利用已发表文章中的参考数据即可轻松计算。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.