Application of numerical modelling for morphological changes in a ...
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Application of numerical modelling for morphological changes in a high-energy beach during the south-west monsoon V. R. Shamji, T. S. Shahul Hameed, N. P. Kurian* and K. V. Thomas Marine Sciences Division, Centre for Earth Science Studies, Thiruvananthapuram 695 031, India
Study of beach morphological changes during monsoon and development of capabilities towards its prediction is of vital importance in coastal zone management. A study of the beach erosion/accretion processes during south-west monsoon and its numerical modelling is attempted in this communication for a micro-tidal and high-energy beach. Comprehensive hydrodynamic and beach profile data measured in the field were used for the study. The beach morphological changes as a result of the high intensity monsoon waves are found to be characterized by erosion of beach coupled with deposition in the offshore leading to formation and migration offshore longshore bar. The model LITPROF of the LITPACK software of DHI is found to simulate well the beach morphological changes by adjustment of the calibration parameters. The integrated cross-shore transport computed across the profile, using the model shows high erosion in the beach face coupled with an equivalent accretion in the offshore. The model performance computed using different statistical methods is found to be good.
beach morphological changes, barring the preliminary work of Baba et al.10. The present study is carried out with the objective of numerically modelling beach morphological changes due to high-intensity monsoonal waves for a selected location off the Kerala coast using the LITPROF model of the LITPACK software. Severe beach erosion is reported along the Kerala coast during the south-west monsoon season11–14. Rebuilding of beaches takes place during the latter part of monsoon and post-monsoon period. The important mechanism for high erosion during south-west monsoon is the cross-shore sediment transport than the longshore transport15–17. The present study is taken up at Valiathura, near Thiruvananthapuram (Figure 1), which is a high-energy coast with pronounced erosion during monsoon11. This coast has a micro-tidal regime of range less than 1 m. Beach at Valiathura is straight and inner shelf (
