Groynes Case Study

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Chapter Four
ANALYSIS AND DISCUSSION OF RESULTS

4.1 Introduction
Estimating of maximum possible scour depth around groynes is an important step in the design of groyne foundation. To examine such a phenomenon, sets of experiments are performed using curve (quadrant) groyne model to represent the main shapes used for groynes.
An experimental program has been conducted using clear water condition. As has been mentioned in previous chapters, this program was conducted for a wide range of significant parameters in order to examine the contribution of each parameter to the program.
In this chapter, experimental results will be presented through three main sections. The first section focuses on describing the effect of (flow depth, flow velocity, …show more content…
Therefore, the depth of scour in the case of the long groyne is greater than the short one.
A set of experiments is conducted for evaluating the relationship between spacing and the scour depth. These experiments are shown in figure (4-11), (4-18), and (4-19), while the results are summarized in table (A-8), (A-10), and (A-11).

Figure (4-18): Development of scour depth with spacing between groynes (L= 10 cm).

Figure (4-19): Development of scour depth with spacing between groynes (L= 7 cm).

It can be seen from these figures that the scouring process is greater when the spacing increases, while the other influencing parameters (length of groyne, flow depth, and velocity of flow) are kept constant.

4.3 Shapes of Groyne
Two models were used (quadrant and semi-parabolic) of groynes to investigate the effect of shapes of groyne on the scour depth. A set of experiments is conducted for evaluating the relationship between scour depth and shapes of groyne. These experiments are shown in the figure (4-20), while the results are summarized in table (A-12). Figure (4-20): Development of scour depth with shapes of
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