Experimental investigation of normral hydrograph characteristics effect on scour around spur dike

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babakhani Ali; GHODSIAN MASOUD; Schleiss Aanton

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Journal: Modares Civil Engineering journal Year:2018 | Volume:18 | Issue:4 Page(s): 25-36

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Title

Experimental investigation of normral hydrograph characteristics effect on scour around spur dike

Author(s)

babakhani Ali | GHODSIAN MASOUD | Schleiss Aanton | Issue Writer Certificate

Keywords

ExperimentalQ1

Spur dikeQ2

ScourQ2

HydroghraphQ1

Abstract

Estimating the maximum possible Scour depth around Spur dike is an important step in the design of Spur dike foundations. To determine the maximum Scour depth in the design of Spur dike foundations, the equilibrium Scour depth, which is commonly estimated using peak-flow conditions for engineering design of Spur dike foundations, are used. In fluvial rivers, significant transport of bed materials often takes place during peak-flow discharge in a flood event. In the case of large rivers, the duration of a flood event may last for a few months, but for others the unsteadiness of a flood can be pronounced. The general practice of employing peak-flow discharge for evaluating the maximum Scour depth for design may be questioned because the maximum Scour depth occurring under a flood hydrograph can be much smaller than the calculated value using peak-flow discharge. In other words, using the peak-flow discharge for design can overestimate the maximum Scour depth in comparison to the actual conditions under the flood hydrograph, greatly. Therefore, when the flow unsteadiness is pronounced, investigating the temporal variation of clear water Scour at Spur dike is important to estimating the possible extension of the Scour hole. This will provide useful information for designing the footing safely and the selecting of Scour counter-measure. The degree of severity of the problem is dictated by the magnitude of this Scour hole. In this Experimental study, the Scour around the single Spur dike was investigated under unsteady flow. These tests have been done in terms of clear water and non cohesive sediments. In order to investigating the Scour around the Spur dike, experiments have been done by changing the properties of normal hydrograph such as peak discharge and durability time. In order to producing the hydrograph, we used a device for adjusting the speed of pump motor and generating the variable discharge according to actual discharge time series. In the inlet pipe of pump, a magnetic flow meter is located that Measures the discharge in per one tenth of a second. Thus, the system verifies the requested discharge at any time. The results show that one of the influential parameters that affect the Scour around the Spur dike is the durability time of hydrograph. We concluded that when the durability time increases 6-times, Scour depth will increase 40 percent, because with increasing durability time, the time that Spur dike exposes tensions increases. Furthermore the depth of Scour has increased 35 percent, by increasing 25 percent of peak discharge of hydrograph that is caused by increasing stresses imposed on the bed. Finally, the resulted Scour under unsteady flow was compared with the resulted Scour under steady flow (With flood peak discharge), with a significant difference between the Scour under steady and unsteady flow. Then, an imperial equation was proposed for calculating the Scour depth under hydrograph. This equation was obtained by adding the unsteady coefficient of flow in the equation of equilibrium Scour depth under steady flow. This unsteady coefficient of flow includes effective parameters of hydrograph such as peak flow of hydrograph, peak time, duration time of hydrograph and equilibrium time of Scour.

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APA: Copy

babakhani, Ali, GHODSIAN, MASOUD, & Schleiss, Aanton. (2018). Experimental investigation of normral hydrograph characteristics effect on scour around spur dike. MODARES CIVIL ENGINEERING JOURNAL, 18(4 ), 25-36. SID. https://sid.ir/paper/256615/en

Vancouver: Copy

babakhani Ali, GHODSIAN MASOUD, Schleiss Aanton. Experimental investigation of normral hydrograph characteristics effect on scour around spur dike. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2018;18(4 ):25-36. Available from: https://sid.ir/paper/256615/en

IEEE: Copy

Ali babakhani, MASOUD GHODSIAN, and Aanton Schleiss, “Experimental investigation of normral hydrograph characteristics effect on scour around spur dike,” MODARES CIVIL ENGINEERING JOURNAL, vol. 18, no. 4 , pp. 25–36, 2018, [Online]. Available: https://sid.ir/paper/256615/en

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