检索结果-南通市图书馆

Sensitivity analysis of sediment flux derived by laser diffraction and acoustic backscatter within a reservoir

International Journal of Sediment Research 2018年第1期33卷 18-26页

作者： stefan haun Laura Lizano Institute for Modelling Hydraulic and Environmental Systems University of Stuttgart Department of Hydraulic and Environmental Engineering Norwegian University of Science and Technology Ministry of Environment and Energy

A combination of two indirect methods to measure sediment flux is presented in this study to evaluate suspended sediment transport in a hydropower reservoir. The acoustic backscatter signal(ABS)from an Acoustic Doppler Current Profiler(ADCP) is therefore applied in pre-defined transects within the reservoir in combination with a Laser In-Situ Scattering Transmissometry-stream lined device(LISSTSL). The stationary LISST-SL derived suspended sediment concentration(SSC) measurements are used to calibrate the ABS. From the LISST-SL measurements a time series of SSC is obtained. This enables, in addition, a comprehensive data analysis to evaluate the influence of natural fluctuations of the SSC on the calculated sediment flux, which should be taken into account when assessing sediment transport. Furthermore SSC measurements are done with the LISST-SL close to the reservoir bed. In areas close to the bed no information regarding the ABS is available from the ADCP measurements due to the side-lobe interference. In various studies the information from the last three valid cells is used for ***, as result of a comparison of the LISST-SL measurements with extrapolated SSC values from the ADCP measurements it can be seen that, especially in deep reservoirs, this method has to be adapted to the in-situ conditions.

关键词： Reservoir Suspended sediment concentrations Sediment flux Laser diffraction Acoustic backscatter signal

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Numerical analysis of synthetic granulate deposition in a physical model study

引用

International Journal of Sediment Research 2014年第1期29卷 110-117页

作者： Gabriele HARB stefan haun Joséf SCHNEIDER Nils Reidar B.OLSEN Institute of Hydraulic Engineering and Water Resources Management Graz University of Technology Department of Hydraulic and Environmental Engineering The Norwegian University of Science and Technology

The current study focuses on the application of a three-dimensional numerical model for the prediction of morphological bed *** sediment deposition in a reservoir during a 10-year-fiood was investigated and the results of the simulation were validated with data derived from a physical model *** of the small grain sizes in the prototype,synthetic granulate was used in the physical *** numerical computation domain was a reproduction of the physical model,including the grain sizes and the density of the particles,in order to ensure *** CFD code SSIIM,which solves the RANS-equations in three-dimensions,was used for the *** sediment transport in SSIIM is divided into suspended sediment transport,computed by solving the convection-diffusion equation,and bed-load transport,calculated by an empirical *** results of the numerical simulation correspond well to the results of the physical model *** simulated location and the pattern of the sediment deposition in the reservoir are an accurate representation of the observed distribution in the physical model.

关键词： Physical modeling Numerical modeling RANS-equations Reservoir management Sediment

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：