Density driven mixing layer in environmental flows: A high-resolution remote sensing image based, numerical simulation and field measurements aided confluence mixing model

Dongchen Wang, Marcelo H. García

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Previous study about river mixing layer (ML) has been focused on the mixing of flows with homogenous properties. The impact of temperature, salinity, turbidity, or other properties of river water are neglected. However, under certain circumstances, the minor variance of flow densities (> 0.1\%) may cause different mixing patterns. This density-driven mixing layer (DDML) can be found in many places, such as Chicago River confluence and Rio Parana and Paraguay confluence. At these locations, salinity and turbidity difference between two branches causes a plunging mixing phenomenon which affects the mixing efficiency. Depending on flow conditions, the difference in mixing could be more than two orders of magnitude. In this work, the density-driven mixing layer (DDML) is categoried into four different types, and links to numerical model to study its dynamics. Three transition states from classic mixing layer (ML) by Best (1987) to density-driven mixing layer (DDML) are presented.

Original languageEnglish (US)
Title of host publicationRiver Flow 2020 - Proceedings of the 10th Conference on Fluvial Hydraulics
EditorsWim Uijttewaal, Mario J. Franca, Daniel Valero, Victor Chavarrias, Claudia Ylla Arbos, Ralph Schielen, Ralph Schielen, Alessandra Crosato
PublisherCRC Press/Balkema
Pages130-136
Number of pages7
ISBN (Electronic)9780367627737
StatePublished - 2020
Event10th Conference on Fluvial Hydraulics, River Flow 2020 - Virtual, Online, Netherlands
Duration: Jul 7 2020Jul 10 2020

Publication series

NameRiver Flow 2020 - Proceedings of the 10th Conference on Fluvial Hydraulics

Conference

Conference10th Conference on Fluvial Hydraulics, River Flow 2020
Country/TerritoryNetherlands
CityVirtual, Online
Period7/7/207/10/20

Keywords

  • Density driven mixing layer
  • Remote sensing image based model

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Geotechnical Engineering and Engineering Geology

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