Supercritical exchange flow down a sill

被引：9

作者：

Morin, VM ^{[1
]}

Zhu, DZ ^{[1
]}

Loewen, MR ^{[1
]}

机构：

[1] Univ Alberta, Dept Civil & Environm Engn, Edmonton, AB T6G 2G7, Canada

来源：

JOURNAL OF HYDRAULIC ENGINEERING | 2004年 / 130卷 / 06期

关键词：

D O I：

10.1061/(ASCE)0733-9429(2004)130:6(521)

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

A detailed experimental study was conducted to investigate the hydraulics, interfacial instability, and mixing in the super-critical region of exchange flows downstream of a sill crest. Measurements of the velocity field and the interface position were obtained using flow visualization and particle image velocimetry. Large periodic fluctuations in the measurements of the flow rate and interface position were caused by the Kelvin-Helmholtz (KH) instabilities at the interface as well as the internal seiche. These KH instabilities caused entrainment of fluid from the upper layer into the lower layer, with the entrainment coefficient considerably larger than the values for gravity currents.

引用

页码：521 / 531

页数：11

共 28 条

[1] DENSITY CURRENTS ENTERING LAKES AND RESERVOIRS [J].

ALAVIAN, V ;

JIRKA, GH ;

DENTON, RA ;

JOHNSON, MC ;

STEFAN, HG .

JOURNAL OF HYDRAULIC ENGINEERING-ASCE, 1992, 118 (11) :1464-1489

[2] 2-LAYER MODEL OF SALINE WEDGE .1. ENTRAINMENT AND INTERFACIAL FRICTION [J].

ARITA, M ;

JIRKA, GH .

JOURNAL OF HYDRAULIC ENGINEERING-ASCE, 1987, 113 (10) :1229-1248

[3] THE HYDRAULICS OF 2 FLOWING LAYERS WITH DIFFERENT DENSITIES [J].

ARMI, L .

JOURNAL OF FLUID MECHANICS, 1986, 163 :27-58

[4] A hybrid digital particle tracking velocimetry technique [J].

Cowen, EA ;

Monismith, SG .

EXPERIMENTS IN FLUIDS, 1997, 22 (03) :199-211

[5] Entrainment and turbulence in saline underflow in Lake Ogawara [J].

Dallimore, CJ ;

Imberger, J ;

Ishikawa, T .

JOURNAL OF HYDRAULIC ENGINEERING-ASCE, 2001, 127 (11) :937-948

[6] TURBULENT ENTRAINMENT IN STRATIFIED FLOWS [J].

ELLISON, TH ;

TURNER, JS .

JOURNAL OF FLUID MECHANICS, 1959, 6 (03) :423-448

[7] Stratified flow over topography: the role of small-scale entrainment and mixing in flow establishment [J].

Farmer, D ;

Armi, L .

PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1999, 455 (1989) :3221-3258

[8] THE FLOW OF ATLANTIC WATER THROUGH THE STRAIT OF GIBRALTAR - THE FLOW OF MEDITERRANEAN WATER THROUGH THE STRAIT OF GIBRALTAR [J].

FARMER, DM ;

ARMI, L .

PROGRESS IN OCEANOGRAPHY, 1988, 21 (01) :1-+

[9] MAXIMAL 2-LAYER EXCHANGE OVER A SILL AND THROUGH THE COMBINATION OF A SILL AND CONTRACTION WITH BAROTROPIC FLOW [J].

FARMER, DM ;

ARMI, L .

JOURNAL OF FLUID MECHANICS, 1986, 164 :53-+

[10] Symmetric and nonsymmetric Holmboe instabilities in an inviscid flow [J].

Haigh, SP ;

Lawrence, GA .

PHYSICS OF FLUIDS, 1999, 11 (06) :1459-1468

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