利用移动车辆对沿岸海流进行优化估计

IF 1.9 4区 地球科学 Q2 ENGINEERING, OCEAN Journal of Atmospheric and Oceanic Technology Pub Date : 2023-12-01 DOI:10.1175/jtech-d-23-0039.1
KuanYu Chen, Chen-Fen Huang, Zhe-Wen Zheng, Sheng-Fong Lin, Jin-Yuan Liu, Jenhwa Guo
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引用次数: 0

摘要

海洋声学层析成像技术(OAT)在层析成像区域的外围部署大多数系泊站,以感知螺线管流场。移动车辆层析成像技术(MVT)是海洋声学层析成像技术的一个进步,它不仅能从不同角度对该区域进行采样,以提高测绘海流的分辨率,还能获取该区域内采样点所产生的非旋转流的信息。为了重建完整的二维海流场,开放边界模态分析(OMA)得出的空间模态优于传统的截断傅里叶级数,因为开放边界模态分析技术能有效地描述螺线流和旋转流,其中所有模态都满足海岸线和开放边界条件。我们使用三种不同的海流表示方法对重建结果进行了比较。前两种表示法只解释了螺线流:截断傅里叶级数和 OMA Dirichlet 模式。第三种表示法使用所有 OMA 模式,解释了螺线流和非旋转流。在重建螺线管流时,使用 Dirichlet 模式的 OMA 表示法比傅里叶级数表示法效果更好。在湾口附近出现了较大的差异,OMA-Dirichlet 重构对均匀流的拟合效果更好。然而,在湾口外,非旋转海流占主导地位,存在相当大的不确定性。第三种表示方法包含了诺伊曼模式和边界模式,可以改善这种情况。利用现场数据重建的结果与声学多普勒海流剖面仪(ADCP)的测量结果进行了验证。这项研究有助于我们更好地理解如何在不完全依赖固定传感器或卫星图像的情况下精确测量大面积海洋环流模式。这项研究结合了船载 ADCP 和层析成像技术等多种来源,从而获得了整个调查区域表层水下情况的全貌。它对气候科学、海洋生物学和渔业管理等领域具有重要意义,因为准确了解水团的运动和分布对预测未来趋势和做出明智决策至关重要。
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Optimum Estimation of Coastal Currents Using Moving Vehicles
Ocean acoustic tomography (OAT) deploys most moored stations on the periphery of the tomographic region to sense the solenoidal current field. Moving vehicle tomography (MVT), an advancement of OAT, not only samples the region from various angles for improving the resolution of mapped currents but also acquires information about the irrotational flow due to the sampling points inside the region. To reconstruct a complete two-dimensional current field, the spatial modes derived from the open-boundary modal analysis (OMA) are preferable to the conventional truncated Fourier series since the OMA technique describes the solenoidal and irrotational flows efficiently in which all modes satisfy the coastline and open boundary conditions. Comparisons of the reconstructions are presented using three different representations of currents. The first two representations explain only the solenoidal flow: the truncated Fourier series and the OMA Dirichlet modes. The third representation, accounting for the solenoidal and irrotational flows, uses all the OMA modes. For reconstructing the solenoidal flow, the OMA representation with the Dirichlet modes performs better than the Fourier series. A large difference appears near the bay mouth, where the OMA-Dirichlet reconstruction shows a better fit to the uniform currents. However, considerable uncertainty exists outside the bay mouth where the irrotational currents dominate. This can be improved by the third representation with the inclusion of the Neumann and boundary modes. The reconstruction results using field data were validated against the acoustic Doppler current profiler (ADCP) measurements. Additionally, incorporating constraints from ADCP measurements enhances the accuracy of the reconstruction. This study contributes toward improving our understanding of accurately measuring oceanic circulation patterns over large areas without relying solely upon stationary sensors or satellite imagery. The study combines multiple sources, such as shipboard ADCP and tomographic techniques, to obtain a complete picture of what is happening beneath surface waters across entire regions under investigation. It has important implications for fields such as climate science, marine biology, and fisheries management, where accurate knowledge of the movement and distribution of water masses is crucial for predicting future trends and making informed decisions.
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来源期刊
CiteScore
4.50
自引率
9.10%
发文量
135
审稿时长
3 months
期刊介绍: The Journal of Atmospheric and Oceanic Technology (JTECH) publishes research describing instrumentation and methods used in atmospheric and oceanic research, including remote sensing instruments; measurements, validation, and data analysis techniques from satellites, aircraft, balloons, and surface-based platforms; in situ instruments, measurements, and methods for data acquisition, analysis, and interpretation and assimilation in numerical models; and information systems and algorithms.
期刊最新文献
Synergistic retrievals of ice in high clouds from elastic backscatter lidar, Ku-band radar and submillimeter wave radiometer observations A Versatile Calibration Method for Rotary-Wing UAS as Wind Measurement Systems A Case of Idiopathic Intracranial Hypertension/Pseudotumor Cerebri Syndrome Cured by Myomectomy. Optimum Estimation of Coastal Currents Using Moving Vehicles Evaluation and Intercomparison of Small Uncrewed Aircraft Systems Used for Atmospheric Research
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