Circulation and suspended sediment transport in a sediment starving ria: the Itapessoca

IF 1 4区 地球科学 Q3 MARINE & FRESHWATER BIOLOGY
J. C. O. Oliveira Filho, C. Schettini, R. Silva, E. D. Lima, Ernesto de C. Domingues
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引用次数: 1

Abstract

The Itapessoca estuary is part of the Itamaracá-Itapessoca Estuarine System, a ria-type estuary located on the northeast Brazilian shore, in the state of Pernambuco. Here we present an assessment of the estuarine circulation, suspended sediment dynamics, and its main transport mechanisms. We carried out a field survey where water level, currents, salinity, temperature, and suspended sediment concentration (SSC) were recorded at 10-minute intervals during two complete semi-diurnal tidal cycles under spring tide conditions. The field survey was conducted in September (2012), which is a transitional period between wet and dry seasons. The water level displayed symmetrical ebb-flood phases; however, currents were ebb-dominated. The freshwater contribution was negligible, and the mean salinity was ~35 g/kg, which is slightly lower than the adjacent shelf values (36.5 g/kg). The SSC transport was driven by the ebb-dominated tidal currents, with the highest values of ~30 mg/l occurring during the peak current during the ebb. The source of the suspended sediment was the erosion from the bottom, and the concentration was much lower than other similar estuaries (e.g., Caravelas). This observation suggests this system is a ‘sediment starved system’ in the sense that it presents a low concentration of suspended sediment.
在一个缺乏沉积物的河流中循环和悬浮沉积物的运输:伊塔帕索卡
Itapessoca河口是Itamaracá-Itapessoca河口系统的一部分,该系统是位于巴西东北海岸伯南布哥州的ria型河口。本文对河口环流、悬沙动力学及其主要输运机制进行了评估。我们进行了实地调查,在两个完整的半日潮汐周期中,每隔10分钟记录一次水位、水流、盐度、温度和悬浮泥沙浓度(SSC)。野外调查时间为2012年9月,是旱季与雨季的过渡时期。水位呈对称的涨潮期;然而,海流以退潮为主。淡水的贡献可以忽略不计,平均盐度为~35 g/kg,略低于相邻陆架的值(36.5 g/kg)。SSC输运主要受退潮主导的潮流驱动,在退潮时的峰值流达到了~30 mg/l的最大值。悬浮物的来源是来自底部的侵蚀,其浓度远低于其他类似河口(如卡拉维拉斯)。这一观察结果表明,该系统是一个“沉积物匮乏系统”,因为它呈现出低浓度的悬浮沉积物。
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
CiteScore
1.60
自引率
12.50%
发文量
21
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