Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016WR019695 |
Calculation of in situ acoustic sediment attenuation using off-the-shelf horizontal ADCPs in low concentration settings | |
Haught, Dan1; Venditti, Jeremy G.1; Wright, Scott A.2 | |
2017-06-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:6 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; USA |
英文摘要 | The use of "off-the-shelf" acoustic Doppler velocity profilers (ADCPs) to estimate suspended sediment concentration and grain-size in rivers requires robust methods to estimate sound attenuation by suspended sediment. Theoretical estimates of sediment attenuation require a priori knowledge of the concentration and grain-size distribution (GSD), making the method impractical to apply in routine monitoring programs. In situ methods use acoustic backscatter profile slope to estimate sediment attenuation, and are a more attractive option. However, the performance of in situ sediment attenuation methods has not been extensively compared to theoretical methods. We used three collocated horizontally mounted ADCPs in the Fraser River at Mission, British Columbia and 298 observations of concentration and GSD along the acoustic beams to calculate theoretical and in situ sediment attenuation. Conversion of acoustic intensity from counts to decibels is influenced by the instrument noise floor, which affects the backscatter profile shape and therefore in situ attenuation. We develop a method that converts counts to decibels to maximize profile length, which is useful in rivers where cross-channel acoustic profile penetration is a fraction of total channel width. Nevertheless, the agreement between theoretical and in situ attenuation is poor at low concentrations because cross-stream gradients in concentration, sediment size or GSD can develop, which affect the backscatter profiles. We establish threshold concentrations below which in situ attenuation is unreliable in Fraser River. Our results call for careful examination of cross-stream changes in suspended sediment characteristics and acoustic profiles across a range of flows before in situ attenuation methods are applied in river monitoring programs. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000405997000031 |
WOS关键词 | SUSPENDED SEDIMENT ; FRASER-RIVER ; PARTICLE-SIZE ; SCATTERING ; TRANSPORT ; SAND ; SUSPENSIONS ; SOUND ; ABSORPTION |
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/20010 |
专题 | 资源环境科学 |
作者单位 | 1.Simon Fraser Univ, Dept Geog, Burnaby, BC, Canada; 2.US Geol Survey, Calif Water Sci Ctr, Sacramento, CA USA |
推荐引用方式 GB/T 7714 | Haught, Dan,Venditti, Jeremy G.,Wright, Scott A.. Calculation of in situ acoustic sediment attenuation using off-the-shelf horizontal ADCPs in low concentration settings[J]. WATER RESOURCES RESEARCH,2017,53(6). |
APA | Haught, Dan,Venditti, Jeremy G.,&Wright, Scott A..(2017).Calculation of in situ acoustic sediment attenuation using off-the-shelf horizontal ADCPs in low concentration settings.WATER RESOURCES RESEARCH,53(6). |
MLA | Haught, Dan,et al."Calculation of in situ acoustic sediment attenuation using off-the-shelf horizontal ADCPs in low concentration settings".WATER RESOURCES RESEARCH 53.6(2017). |
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