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Chapter 7 - Establishing an empirical formula 7.5.2 Field data from the Sacramento River It is quite difficult to obtain relyable field data of the bed topography in scour holes. To the authors knowledge, no field data of alpine river bends is available. For this reason, the field measurements on the Sacramento River of ODGAARD & KENNEDY (1982) and ODGAARD (1984b) are used in the present study to check the prediction capability of the developed formulae: • The first dataset (1982) contains measurements in a test reach between miles 188 and 189 (Fig. 7.18). The grain size of the bed material is quite fine compared to the one of alpine rivers. The median diameter d 50 ranges between 6 and 21 mm for high flow conditions (discharge of Q = 700 to 800 m 3 /s). • The second dataset (1984) was recorded in selected cross sections between miles 144 and 189 (about 100 miles north of San Francisco) in Colusa, Princeton, Larkin, Jacinto, Old Ferry and at the Road 29. The bed material is very fine ( d 50 = 0.4 mm). 24’900 ft 3 /s = 700 m 3 /s Figure 7.18: Sacramento River: location of the field data set [Odgaard and Kennedy , 1982, Fig.4 + <strong>12</strong>] page 186 / November 9, 2002 Wall roughness effects on flow and scouring
Comparison with scale model tests and field data 50 computed 40 30 20 DH polynome fit Bridge corr GPK with MR Odgaard 1984 miles 144-188 10 Odgaard 1981/82 miles 188-189 0 0 10 20 30 40 50 measured Figure 7.19: Comparison between measured field data and computed maximum scour depth (Sacramento River) The comparison of the field data with the computed results (equations 7.31: polynome fit, 7.63: GPKernel and 7.7: modified Bridge) shows in general an acceptable agreement for Odgaard & Kennedy’s (1982) data set. The modified equation of Bridge shows a systematic overestimation of the scour, whereas the polynomial function, developed in the present study underestimates the scour in the test reach. This might be due to the much finer grain size distribution of the bed material. Compared to the modified scour formula of Bridge, the computed scour depth is reduced by 25 to 35% which is the same order of magnitude as observed in the laboratory tests performed in this study. <strong>EPFL</strong> Ph.D thesis 2632 - Daniel S. Hersberger November 9, 2002 / page 187
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WALL ROUGHNESS EFFECTS ON FLOW AND
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Abstract By applying vertical ribs
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Résumé En disposant des nervures
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Zusammenfassung • Ein markanter S
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Acknowledgments page x / November 9
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Table of contents 4. Smart & Jäggi
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Table of contents 7.6 Summary and c
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Chapter 1 - Introduction 1.1 Contex
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