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Numerical Investigation of Hyporheic Flows Induced by Gravel Bars and Sand Dunes.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Numerical Investigation of Hyporheic Flows Induced by Gravel Bars and Sand Dunes./
作者:	Mirzaei, Seyed Hessam Seyed.
面頁冊數:	1 online resource (414 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-01, Section: B.
Contained By:	Dissertations Abstracts International84-01B.
標題:	Fluid mechanics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29178518click for full text (PQDT)
ISBN:	9798835551781

Numerical Investigation of Hyporheic Flows Induced by Gravel Bars and Sand Dunes.
Mirzaei, Seyed Hessam Seyed.

Numerical Investigation of Hyporheic Flows Induced by Gravel Bars and Sand Dunes. - 1 online resource (414 pages)

Source: Dissertations Abstracts International, Volume: 84-01, Section: B.

Thesis (Ph.D.)--Queen's University (Canada), 2022.

Includes bibliographical references

Existence of gravel bars and sand dunes in river streams results in exchange of flow across the interface of stream flow and porous medium known as hyporheic flow. This type of flow conveys solutes and nutrients to the riprapian organisms living in the hyporheic zone, and in case of river contamination they can be the main mechanism of contaminating the habitat of aquatic organisms. Therefore, it is critical to understand the mechanics of hyporheic flows induced by bed forms, and develop methods and tools for estimating their characteristics. This thesis is intended as a contribution to these ends. In this study, the main effort has been made to develop a 3-D fully coupled numerical model capable of simulating the hyporheic flows both in turbulent and laminar flow regimes, while treating the interface between streamflow and porous medium as a permeable wall. The work involves an extensive series of numerical simulations conducted for different ranges of bed form geometry, permeability of porous materials and depth of alluvium, which are the key parameters controlling the characteristics of hyporheic flows. Predictive equations are developed for estimating the discharge, average velocity and average residence time in the hyporheic zones induced by a single gravel bar, a sequence of bars, and a sequence of dunes. It is found that by applying a combination of Wall and Cyclic boundary conditions on the interface between streamflow and porous medium, the effects of the permeable wall on both surface and hyporheic flow fields is simulated very well. Comparison between the simulated data and their predicted counterparts by the empirical equations for the hyporheic flows induced by a single gravel bar revealed that in more than 80% of the cases, the error is within 10% error range. Due to the more complex nature of the hyporheic flows induced by a sequence of gravel bars and sand dunes the accuracy of the developed predictive equations is less than the ones developed for hyporheic flows induced by a single gravel bar. However, the equations are still very good in estimating the characteristics of hyporheic flows.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798835551781Subjects--Topical Terms:

528155
Fluid mechanics.
Index Terms--Genre/Form:

542853
Electronic books.

Numerical Investigation of Hyporheic Flows Induced by Gravel Bars and Sand Dunes.
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500 $a Source: Dissertations Abstracts International, Volume: 84-01, Section: B.
500 $a Advisor: da Silva, Ana Maria A. F.
502 $a Thesis (Ph.D.)--Queen's University (Canada), 2022.
504 $a Includes bibliographical references
520 $a Existence of gravel bars and sand dunes in river streams results in exchange of flow across the interface of stream flow and porous medium known as hyporheic flow. This type of flow conveys solutes and nutrients to the riprapian organisms living in the hyporheic zone, and in case of river contamination they can be the main mechanism of contaminating the habitat of aquatic organisms. Therefore, it is critical to understand the mechanics of hyporheic flows induced by bed forms, and develop methods and tools for estimating their characteristics. This thesis is intended as a contribution to these ends. In this study, the main effort has been made to develop a 3-D fully coupled numerical model capable of simulating the hyporheic flows both in turbulent and laminar flow regimes, while treating the interface between streamflow and porous medium as a permeable wall. The work involves an extensive series of numerical simulations conducted for different ranges of bed form geometry, permeability of porous materials and depth of alluvium, which are the key parameters controlling the characteristics of hyporheic flows. Predictive equations are developed for estimating the discharge, average velocity and average residence time in the hyporheic zones induced by a single gravel bar, a sequence of bars, and a sequence of dunes. It is found that by applying a combination of Wall and Cyclic boundary conditions on the interface between streamflow and porous medium, the effects of the permeable wall on both surface and hyporheic flow fields is simulated very well. Comparison between the simulated data and their predicted counterparts by the empirical equations for the hyporheic flows induced by a single gravel bar revealed that in more than 80% of the cases, the error is within 10% error range. Due to the more complex nature of the hyporheic flows induced by a sequence of gravel bars and sand dunes the accuracy of the developed predictive equations is less than the ones developed for hyporheic flows induced by a single gravel bar. However, the equations are still very good in estimating the characteristics of hyporheic flows.
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650 4 $a Normal distribution. $3 3561025
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