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Figure 1. Location of the study area. where Q is the annual alongshore sediment transport (m*/year), p the density of water (1024 kg/m’), g the

Figure 1 Location of the study area. where Q is the annual alongshore sediment transport (m*/year), p the density of water (1024 kg/m’), g the

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Figure 2. Beach profiles at Candolim (a) station-1 and (5) station-2.
Figure 2. Beach profiles at Candolim (a) station-1 and (5) station-2.
Table 1. Longshore sediment transport rates (LSTR) (m’/year) during the study period sand accumulated on the beach compared to January. Between December and February, an overall erosion of .38 m® was observed between points P and Q. At sta- ion-2, profiles were compared between 70 m from the emporary benchmark and the waterline, as no significant changes in that region were observed. A comparison of he foreshore profiles showed erosion at this station. Between points P and Q, even though small volume of sand deposited from December to January (0.25 m°) a arge volume of sediments (6.18 m*) was found to be eroded from this station during December to February Figure 3 5). ot
Table 1. Longshore sediment transport rates (LSTR) (m’/year) during the study period sand accumulated on the beach compared to January. Between December and February, an overall erosion of .38 m® was observed between points P and Q. At sta- ion-2, profiles were compared between 70 m from the emporary benchmark and the waterline, as no significant changes in that region were observed. A comparison of he foreshore profiles showed erosion at this station. Between points P and Q, even though small volume of sand deposited from December to January (0.25 m°) a arge volume of sediments (6.18 m*) was found to be eroded from this station during December to February Figure 3 5). ot
Figure 4. Beach profile at Keri station-1. Figure 3. Beach profile at Miramar (a) station-1 and (b) station-2.
Figure 4. Beach profile at Keri station-1. Figure 3. Beach profile at Miramar (a) station-1 and (b) station-2.
Equilibrium beach profiles are drawn using the two-thirds power model of Bruun/Dean and the exponential model '°. Analysing the three plots of the profiles (Figure 5 a—c), it is found that sediment scale parameter, profile shape factor and beach face slope, are indeed the major factors establishing the equilibrium shape of the profile. Using the profiles derived from compound profile method", A(y), with different A and m values for each sector, fits well with measured profile compared to the those derived
Equilibrium beach profiles are drawn using the two-thirds power model of Bruun/Dean and the exponential model '°. Analysing the three plots of the profiles (Figure 5 a—c), it is found that sediment scale parameter, profile shape factor and beach face slope, are indeed the major factors establishing the equilibrium shape of the profile. Using the profiles derived from compound profile method", A(y), with different A and m values for each sector, fits well with measured profile compared to the those derived
Figure 5. Plot-1 (a), plot-2 (b) and plot-3 (c) of equilibrium beach profiles from Candolim (19 January 2012). from a single value of A either derived from Ds or w,, or a single value of m, either fixed (two-thirds) or arbitrary. Sediment scale parameter A, selected according to the slope of the profile to obtain a better fit profile, is larger than the calculated A, or A, (Figure 6). However, between profiles obtained with A, resulted in much better fit than those derived using A;. Comparing Bruun/Dean model and exponential model with measured profiles from Can- dolim, Miramar and Keri beaches of Goa, shows that out of the nine profiles the exponential model fits better in six profiles (Figure 5 5). The quality of fit obtained between
Figure 5. Plot-1 (a), plot-2 (b) and plot-3 (c) of equilibrium beach profiles from Candolim (19 January 2012). from a single value of A either derived from Ds or w,, or a single value of m, either fixed (two-thirds) or arbitrary. Sediment scale parameter A, selected according to the slope of the profile to obtain a better fit profile, is larger than the calculated A, or A, (Figure 6). However, between profiles obtained with A, resulted in much better fit than those derived using A;. Comparing Bruun/Dean model and exponential model with measured profiles from Can- dolim, Miramar and Keri beaches of Goa, shows that out of the nine profiles the exponential model fits better in six profiles (Figure 5 5). The quality of fit obtained between
Figure 6. Dependence of sediment scale parameter A on sediment grain size and fall velocity.
Figure 6. Dependence of sediment scale parameter A on sediment grain size and fall velocity.
Figure 7. Relationship between sediment scale parameter and profile shape factor for profiles from Candolim
Figure 7. Relationship between sediment scale parameter and profile shape factor for profiles from Candolim
Figure 8. Histogram of best-fit values of (a) Az and (b) m2 for nine profiles from Candolim, Miramar and Keri beaches
Figure 8. Histogram of best-fit values of (a) Az and (b) m2 for nine profiles from Candolim, Miramar and Keri beaches
Figure 9. Variation of A and m2 with respect to beach face slope.
Figure 9. Variation of A and m2 with respect to beach face slope.
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Coastal EngineeringBeach Processes
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