Expanding pools morphology in live-bed conditions

• Autorzy: Pagliara S. , Palermo M. , Carnacina I.
• Języki publikacji: EN

Abstrakty

EN

Sediment load plays a fundamental role in natural river morphology evolution. Therefore, the correct assessment of the role of the sediment load on natural or anthropic pools morphology downstream of river grade control structures, such as rock chute or block ramps, is of fundamental interest for preserving the fish habitat and the river morphology. This work presents an experimental study on the sediment load influence on rectangular expanding pools downstream of block ramps in live-bed conditions. Several longitudinal and transversal expanding ratios have been tested. Ramp slopes were varied between 0.083 and 0.25. The effect of the pool geometry and the sediment load on hydraulic jump downstream of block ramp as well as scour morphologies and flow patterns have been analyzed. Equations were derived to evaluate the maximum scour hole depth, the longitudinal distance of the section in which it occurs, and the maximum water elevations both in the pool and in the downstream contraction.

Słowa kluczowe

EN

block ramp; expanding pool; hydraulic jump; live-bed; scour morphology

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2011
• Tom: Vol. 59, no. 2
• Strony: 296--316
• Opis fizyczny: Bibliogr. 35 poz.

Twórcy

autor

Pagliara S.

autor

Palermo M.

autor

Carnacina I.

• Department of Civil Engineering, University of Pisa, Pisa, Italy,

Bibliografia

• Bhuiyan, F., R.D. Hey, and P.R. Wormleaton (2007), Hydraulic evaluation of W-weir for river restoration, J. Hydr. Engrg. 133, 6, 596-609.
• Bormann, N.E., and P.Y. Julien (1991), Scour downstream of grade-control structures, J. Hydr. Engrg. 117, 5, 579-594.
• Bremen, R., and W.H. Hager (1993), T-jump in abruptly expanding channel, J. Hydraul. Res. 31, 1, 61-78.
• Breusers, H.N.C., and A.J. Raudkivi (1991), Scouring, Balkema, Rotterdam.
• Chiew, Y.M., and F.H. Lim (2000), Failure behavior of riprap layer at bridge piers under live-bed conditions, J. Hydr. Engrg. 126, 1, 43-55.
• D’Agostino, V., and V. Ferro (2004), Scour on alluvial bed downstream of gradecontrol structures, J. Hydr. Engrg. 130, 1, 24-37.
• Dey, S., and R.V. Raikar (2005), Scour in long contractions, J. Hydr. Engrg. 131, 12, 1036-1049.
• Dey, S., and R.V. Raikar (2006), Live-bed scour in long contractions, Int. J. Sediment Res. 21, 2, 166-170.
• Dey, S., and A. Sarkar (2006), Scour downstream of an apron due to submerged horizontal jets, J. Hydr. Engrg. 132, 3, 246-257.
• Gaudio, R., and A. Marion (2003), Time evolution of scouring downstream of Bed sills, J. Hydraul. Res. 41, 3, 271-284.
• Hassan, N.M.K.N., and R. Narayanan (1985), Local scour downstream of an apron, J. Hydr. Engrg. 111, 11, 1371-1384.
• Herbrand, K. (1973), The spatial hydraulic jump, J. Hydraul. Res. 11, 3, 205-218.
• Hoffmans, G.J.C.M., and H.J. Verheij (1997), Scour Manual, Balkema, Rotterdam.
• Lisle, T.E. (1982), Effects of aggradation and degradation on riffle-pool morphology in natural gravel channels, northwestern California, Water Resour. Res. 18, 6, 1643-1651.
• Lenzi, M.A., A. Marion, and F. Comiti (2003), Interference processes on scouring AT bed sills, Earth Surf. Proces. Land. 28, 1, 99-110.
• Marion, A., M.A. Lenzi, and F. Comiti (2004), Effect of sill spacing and sedyment size grading on scouring at grade-control structures, Earth Surf. Proces. Land. 29, 8, 983-993, DOI: 10.1002/esp.1081.
• Marion, A., M. Tregnaghi, and S. Tait (2006), Sediment supply and local scouring AT bed sills in high-gradient streams, Water Resour. Res. 42, 6, W06416.
• Martín-Vide, J.P., and A. Andreatta (2006), Disturbance caused by bed sills on the slopes of steep streams, J. Hydr. Engrg. 132, 11, 1186-1194.
• Martín-Vide, J.P., and A. Andreatta (2009), Channel degradation and slope adjustment in steep streams controlled through bed sills, Earth Surf. Proces. Land. 34, 1, 38-47.
• Mason, P.J., and K. Arumugam (1985), Free jet scour below dams and flip buckets, J. Hydr. Engrg. 111, 2, 220-235.
• Melville, B.W. (1984), Live-bed scour at bridge piers, J. Hydr. Engrg. 110, 9, 1234-1247.
• Melville, B.W., and Y.M. Chiew (1999), Time scale for local scour at bridge piers, J. Hydr. Engrg. 125, 1, 59-65.
• Ohtsu, I., Y. Yasuda, and M. Ishikawa (1999), Submerged hydraulic jumps below abrupt expansions, J. Hydr. Engrg. 125, 5, 492-499.
• Oliveto, G., and W.H. Hager (2002), Temporal evolution of clear-water pier and abutment scour, J. Hydr. Engrg. 128, 9, 811-820.
• Pagliara, S. (2007), Influence of sediment gradation on scour downstream of Block ramps, J. Hydr. Engrg. 133, 11, 1241-1248.
• Pagliara, S., and M. Palermo (2008), Scour control and surface sediment distribution downstream of block ramps, J. Hydraul. Res. 46, 3, 334-343.
• Pagliara, S., M. Palermo, and I. Carnacina (2009), Scour and hydraulic jump downstream of block ramps in expanding stilling basins, J. Hydraul. Res. 47, 4, 503-511.
• Phillips, J.D. (2010), The job of the river, Earth Surf. Proces. Land. 35, 3, 305-313.
• Rajaratnam, N., and K. Subramanya (1968), Hydraulic jumps below abrupt symmetrical expansions, J. Hydraul. Div. ASCE 94, 2, 481-503.
• Ram, K.V.S., and R. Prasad (1998), Spatial B-jump at sudden channel enlargements with abrupt drop, J. Hydr. Engrg. 124, 6, 643-646.
• Sheppard, D.M., and W. Miller (2006), Live-bed local pier scour experiments, J. Hydr. Engrg. 132, 7, 635-642.
• Smith, C.D. (1989), The submerged hydraulic jump in an abrupt lateral expansion, J. Hydraul. Res. 27, 2, 257-266.
• Veronese, A. (1937), Erosioni di fondo a valle di uno scarico (Downstream bed erosion due to a discharge), Ann. Lavori Pubblici 75, 9, 717-726 (in Italian).
• Whitaker, A.C., and D.F. Potts (2007), Coarse bed load transport in an alluvial gravel bed stream, Dupuyer Creek, Montana, Earth Surf. Proces. Land. 32, 13, 1984-2004.
• Yasuda, Y., and T. Ohnishi (2009), Relationship between migration route of swimming fishes and velocity characteristics in pool-type fishways with a trapezoid al section, 33rd IAHR Congress “Water Engineering for a Sustainable Environment”, International Association of Hydraulic Engineering and Research (IAHR), 1577-1584.