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DOI | 10.1029/2018WR022550 |
LSPIV Measurements of Two-Dimensional Flow Structure in Streams Using Small Unmanned Aerial Systems: 1. Accuracy Assessment Based on Comparison With Stationary Camera Platforms and In-Stream Velocity Measurements | |
Lewis, Quinn W.1,2; Rhoads, Bruce L.1 | |
2018-10-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2018 |
卷号 | 54期号:10页码:8000-8018 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Measuring two-dimensional (2-D) patterns of flow in rivers at high resolution over large areas is challenging using traditional velocity-measurement methods, which provide data at specific locations or cross sections. Large-scale particle image velocimetry (LSPIV) based on imagery obtained from fixed camera platforms can measure flow velocity on the surface of rivers and is generally accurate compared to near-surface velocity measurements obtained by traditional methods. The proliferation of inexpensive small unmanned aerial systems (sUAS) equipped with high-resolution cameras and onboard GPS has the potential to facilitate measurements of flow patterns in rivers using LSPIV, but few studies have assessed the accuracy of sUAS-derived LSPIV compared to fixed-platform LSPIV and in-stream velocity measurements. This study assesses the accuracy of sUAS-based LSPIV for measuring 2-D mean surface velocities as well as quasi-instantaneous 2-D velocities obtained from successive image frames. For persistent 2-D flow, mean velocities derived from sUAS-based LSPIV match those obtained by stationary camera platforms, and velocities measured by both LSPIV methods agree with near-surface velocities measured by an acoustic Doppler velocimeter. Quasi-instantaneous velocities are degraded by camera movement and low pixel resolution, but capturing the evolution of 2-D flow structures is possible in certain circumstances. The results confirm that sUAS-derived LSPIV provides accurate, high-resolution measurements of mean surface velocities over large spatial areas of persistent 2-D flow and can characterize evolving 2-D flow structures under favorable conditions. sUAS-based LSPIV is a valuable new method for mapping of 2-D patterns of surface flow in rivers-an issue explored in a companion paper. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000450726000048 |
WOS关键词 | PARTICLE IMAGE VELOCIMETRY ; TURBULENCE STRUCTURE ; PIV-MEASUREMENTS ; RIVER ; SURFACE ; CONFLUENCES ; EXCHANGE ; FIELDS ; MODEL ; COST |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/21747 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Illinois, Dept Geog & Geog Informat Sci, Urbana, IL 61801 USA; 2.Indiana Univ, Dept Earth & Atmospher Sci, Bloomington, IN 47405 USA |
推荐引用方式 GB/T 7714 | Lewis, Quinn W.,Rhoads, Bruce L.. LSPIV Measurements of Two-Dimensional Flow Structure in Streams Using Small Unmanned Aerial Systems: 1. Accuracy Assessment Based on Comparison With Stationary Camera Platforms and In-Stream Velocity Measurements[J]. WATER RESOURCES RESEARCH,2018,54(10):8000-8018. |
APA | Lewis, Quinn W.,&Rhoads, Bruce L..(2018).LSPIV Measurements of Two-Dimensional Flow Structure in Streams Using Small Unmanned Aerial Systems: 1. Accuracy Assessment Based on Comparison With Stationary Camera Platforms and In-Stream Velocity Measurements.WATER RESOURCES RESEARCH,54(10),8000-8018. |
MLA | Lewis, Quinn W.,et al."LSPIV Measurements of Two-Dimensional Flow Structure in Streams Using Small Unmanned Aerial Systems: 1. Accuracy Assessment Based on Comparison With Stationary Camera Platforms and In-Stream Velocity Measurements".WATER RESOURCES RESEARCH 54.10(2018):8000-8018. |
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