An Investigation of the Hydrography of Chabahar Bay Using FVCOM Model and EOF Analysis

IF 2 4区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Marine Geodesy Pub Date : 2022-02-22 DOI:10.1080/01490419.2022.2042434

Alireza Bahmanzadegan Jahromi, M. Ezam, K. Lari, Abbas-Ali Ali Akbari Bidokhti

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引用次数: 1

Abstract

Abstract Chabahar Bay is a semi-enclosed and shallow omega-shaped bay, located on the south-eastern coasts of Iran. The 3D unstructured-grid Finite-Volume Coastal Ocean Model was employed to study the physical characteristics of water in Chabahar Bay. The correlation coefficients between the model and available measurements were 0.99 and 0.84 for water level and current velocity, respectively. The numerical results show that the depth averaged temperature of the Bay generally decreases from north to south and varies between 20-26 °C during the year. The basin average of annual salinity is 36.1 psu. Hence, the density increases from north to south and is strongly affected by temperature changes. The vertically average of sigma-t varies between 21.5-24.0 kg/m3. In the northern half of the Bay a warm center eddy is formed from March; during July, it strengthened and peaked in August. With Applying EOFs analysis on model surface temperature four principal patterns were determined. EOF1 corresponds to the bathymetry of the region and shows the heat capacity of the Bay, it is in accordance with the monsoon conditions. EOF2, 3, and 4 are corresponding to the effect of the wind. Due to dominant winds a strong upwelling was determined along the western coast.

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基于FVCOM模型和EOF分析的恰巴哈尔湾水文研究

摘要Chabahar湾位于伊朗东南海岸，是一个半封闭的浅欧米茄形海湾。采用三维非结构化网格有限体积海岸海洋模型研究了查巴哈尔湾水体的物理特性。水位和流速的模型与可用测量值之间的相关系数分别为0.99和0.84。数值结果表明，海湾的深度平均温度通常从北向南降低，在20-26之间变化 °C。盆地年平均盐度为36.1 psu。因此，密度从北向南增加，并受到温度变化的强烈影响。sigma-t的垂直平均值在21.5-24.0之间变化 kg/m3。在海湾的北半部，从三月开始形成一个温暖的中心涡；在7月份，它增强，并在8月份达到峰值。应用EOFs对模型表面温度的分析，确定了四种主要模式。EOF1对应于该地区的水深测量，显示了海湾的热容，符合季风条件。EOF2、3和4对应于风的影响。由于主导风，沿西海岸确定了强烈的上升流。

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 Geodesy 地学-地球化学与地球物理

CiteScore

4.10

自引率

6.20%

发文量

审稿时长

>12 weeks

期刊介绍： The aim of Marine Geodesy is to stimulate progress in ocean surveys, mapping, and remote sensing by promoting problem-oriented research in the marine and coastal environment. The journal will consider articles on the following topics: topography and mapping; satellite altimetry; bathymetry; positioning; precise navigation; boundary demarcation and determination; tsunamis; plate/tectonics; geoid determination; hydrographic and oceanographic observations; acoustics and space instrumentation; ground truth; system calibration and validation; geographic information systems.