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IMPACTS OF DIMENSION AND SLOPE OF SUBMERGED SPUR DIKES ON LOCAL SCOUR PROCESSES-AN EXPERIMENTAL STUDY

International Journal of Sediment Research 2006年第2期21卷 89-100页

作者： ronald W.thring Environmental Science and Engineering University of Northern British Columbia Prince George BC Canada V2N 4Z9 Prof.

In this experimental study, the impacts of the slope of the upstream face of submerged spur dikes on scour patterns in the vicinity of the submerged spur dike have been investigated. Associated hydraulic parameters for scour initiation have been studied. The dependence of the criteria for scour initiation and scour patterns on the dike dimensions such as the dike length and height has been assessed. It is found that the maximum depth of a scour hole is localized upstream of the spur dike end. The location of the maximum scouring depth, the end of the spur dike, and the spot with the maximum deposition are nearly aligned and form a line approximately parallel to the flume wall. Results show that the proper selection of a sloped upstream face of the spur dike can significantly reduce the maximum scour depth and scour volume in the vicinity of the submerged spur dike. Equations have been established to describe the dependence of the criteria for scour initiation and the maximum depth of the scour hole on the Froude number of the flow, the blockage of the cross section by the spur dikes, the slope of upstream face of the spur dike, and the grain size of the bed material.

关键词： Spur dike dimensions Froude number Local scour Scour depth Slope of upstream face (SUF) of spur dike Submerged spur dike

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EFFECTS OF RIVER ICE ON STAGE-DISCHARGE RELATIONSHIPS——A CASE STUDY OF THE YELLOW RIVER

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International Journal of Sediment Research 2007年第4期22卷 263-272页

作者： ronald thring Bryan W. KARNEY Prof. Environmental Engineering University of Northern British Columbia 3333 University Way Prince George BC Canada V2N 4Z9 Prof. Department of Civil Engineering University of Toronto 35 St. George Street Toronto ON Canada M5S 1A4

Using field observations at four gauging stations along the Inner Mongolia Reach of the Yellow River in China, this paper explores effects of the ice on the hydraulics of this river reach for four different conditions, namely: under open channel flow, during ice-running period, the ice-covered period, and the river break-up period. The rating curves were found to be well recognized under open channel situations, but were sometimes poorly defined and extremely variable under ice conditions. The results also show that the water level is insensitive to flowing ice prior to freeze-up. However, significant, but hardly surprising, variations were observed during ice-covered conditions. The rating curves for both the ice covered condition and river ice breakup period are developed and some related hydraulic issues are examined. Additionally, the impacts of the ice accumulation and associated riverbed deformation during ice period on the rating curves are discussed.

关键词： Ice-running period Ice covered period Rating curve Riverbed deformation River ice break-up

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