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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 + 12]
page 186 / November 9, 2002
Wall roughness effects on flow and scouring