Analysis of the effects of dredging on current circulation and salinity of the Itajaí-Açú estuary

Eva Pavo Fernández, J. Pereira Filho, Cristina Ono Horita, Mauro Michelena Andrade
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Abstract

The Itajaí-Açú river is the largest source of drainage in the state of Santa Catarina (Brazil). At the mouth of this river is located the Itajaí-Açú estuary, which is a highly stratified estuary, dominated mainly by river discharge. The port of Itajaí is located at the mouth of this estuary, one of the most important ports in the country's south. Due to the presence of the port, the Itajaí-Açú estuary is constantly dredged. Therefore, the main objective of this paper is to analyse the effects of the dredging of 2011, which deepened the channel from 11m to 14m, on the estuary circulation of the Itajaí-Açú river in comparison to the estuary circulation in 2008. Thus, data on river discharge, recorded by a hydrometric station, and current velocity vertical profiles, recorded by an Acoustic Doppler Current Profiler (ADCP) anchored in the channel of the estuary were analysed. A salinity analysis was also performed with data recorded by a CTD to compare the salinity stratification of the water column in the study period. Results showed an increase in current velocity in the estuary after the 2011 dredging. In both study periods (2008 and 2011), currents were ebb-directed. Results suggest that the dredging has modified the estuarine circulation as the currents intensified. Salinity results show an increase in values after the dredging (2011), being the water column clearly stratified.
疏浚对Itajaí-Açú河口洋流及盐度的影响分析
Itajaí-Açú河是圣卡塔琳娜州(巴西)最大的排水源。河口处为Itajaí-Açú河口,是一个以河流流量为主的高度分层河口。Itajaí港口位于这个河口口,是该国南部最重要的港口之一。由于港口的存在,Itajaí-Açú河口不断疏浚。因此,本文的主要目的是分析2011年疏浚对Itajaí-Açú河河口环流的影响,将河道从11米加深到14米,并与2008年的河口环流进行比较。因此,对水文站记录的河流流量数据和锚定在河口航道上的声学多普勒水流剖面仪(ADCP)记录的流速垂直剖面进行了分析。利用CTD记录的数据进行了盐度分析,以比较研究期间水柱的盐度分层。结果表明,2011年疏浚后,河口流速有所增加。在两个研究时期(2008年和2011年),洋流都是向退潮的。结果表明,随着水流的增强,疏浚改变了河口环流。盐度结果显示疏浚后(2011年)的值有所增加,因为水柱分层明显。
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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