Abstract
Spatial and temporal (pre- and post-monsoon) beach morphological changes along the Udupi district, Karnataka are investigated during 2011 and 2012. Beach profile surveys were carried out using traditional techniques at twelve selected beaches and estimated the cross sectional area and sediment volume changes. The data collected were computed and analysed using SANDS free software. Finally, based on beach profile changes, the inter-annual variabilities were quantified in-terms of cross-sectional area and sediment volumes. During the southwest monsoon period, width of the beaches in the study area reduced greatly and minimum volume of sediment is stored. The sediment volume was high during the post-monsoon season compared to the pre-monsoon season. Cross sectional area analysis reveals that most of the beaches in the study area accreted by >30%. However, the maximum reduction in areal extent at Mattu Katpadi, Gangolli, Maravanthe and Navunda beaches took place during the SW monsoon. Although cyclic in nature, large-scale erosion was found during SW monsoon but the lost sediment is regained in the post-monsoon period. Human interventions play a vital role in shoreline changes, in addition to natural processes.
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