FlocARAZI: An In‐Situ, Image‐Based Profiling Instrument for Sizing Solid and Flocculated Suspended Sediment
FlocARAZI: An In‐Situ, Image‐Based Profiling Instrument for Sizing Solid and Flocculated Suspended Sediment
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DOI：
10.1029/2021jf006210
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发表时间：
2021-10
期刊：
影响因子：
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通讯作者：
R. Osborn;Brandon Dillon;D. Tran;E. Abolfazli;K. Dunne;J. Nittrouer;K. Strom
中科院分区：
文献类型：
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作者：
R. Osborn;Brandon Dillon;D. Tran;E. Abolfazli;K. Dunne;J. Nittrouer;K. Strom
开发了一种廉价、紧凑的水下数码相机成像系统，用于采集深度达60米的絮凝悬浮沉积物的原位高分辨率图像。该相机的视场为3.7 × 2.8 mm，可分辨小至5 μm的颗粒。根据絮凝的程度，该系统能够精确地将颗粒尺寸调整到浓度高达500 mg/L。该系统足够快，以允许剖析，从而悬浮颗粒和絮凝物的尺寸分布可以在相对较短的时间内在水柱内的多个垂直方向上提供（对于15米的剖面，大约15分钟）。使用图像处理程序的输出，方法被引入到估计的质量悬浮泥沙浓度（SSC）的图像和分离到沙子和泥浆絮凝体人口识别的颗粒。这两种方法的组合允许独立地估计每个级分的大小和浓度。相机和图像分析方法在实验室和密西西比河都用于开发和测试。本研究中提供了两种设置的输出。
An inexpensive and compact underwater digital camera imaging system was developed to collect in situ high resolution images of flocculated suspended sediment at depths of up to 60 meters. The camera has a field of view of 3.7 × 2.8 mm and can resolve particles down to 5 μm . Depending on the degree of flocculation, the system is capable of accurately sizing particles to concentrations up to 500 mg/L. The system is fast enough to allow for profiling whereby size distributions of suspended particles and flocs can be provided at multiple verticals within the water column over a relatively short amount of time (approximately 15 min for a profile of 15 m). Using output from image processing routines, methods are introduced to estimate the mass suspended sediment concentration (SSC) from the images and to separate identified particles into sand and mud floc populations. The combination of these two methods allows for the size and concentration estimates of each fraction independently. The camera and image analysis methods are used in both the laboratory and the Mississippi River for development and testing. Output from both settings are presented in this study.