| Abstract Submission No. | ABS-1.1-0031 |
| Title of Abstract | Sediment Transport and High Tide Line change Analysis along the Vizianagaram District, Andhra Pradesh |
| Authors | GBR Sandeep Reddy, Muni Reddy M.G*, Naveen Raja K |
| Organisation | Andhra University |
| Address | Department of Civil Engineering, Andhra University Visakhapatnam, Andhra Pradesh, India Pincode: 530003 E-mail: mgmreddyauce@gmail.com |
| Country | India |
| Presentation | Oral |
| Abstract | Understanding Sediment Analysis and Shoreline change and High tide line (HTL) dynamics is essential for effective coastal management, particularly along rapidly evolving coasts such as Vizianagaram district, Andhra Pradesh, India. This study integrates field surveys, computer aided modelling and geospatial technologies to quantify sediment accretion and erosion along each transacts to examine the morphological changes in Pre-Monsoon and Post-Monsoon at selected locations of Chinthapalli, Tippalavalasa and Kancheru of Vizianagaram district and shoreline evolution over 24-year period (2000-2024) and to predict future HTL positions for the next two decades. A critical component of this study was the demarcation of the surveyed locations using DGPS data. The mapped HTL was compared with the extracted normal shoreline positions, revealing significant differences in spatial extent that highlight the vulnerability of certain stretches. From Observations Chinthapalli and Tippalavalasa sectors demonstrated net accretion of 36,453 m3 and 37,577 m3 annually, whereas Kancheru exhibited persistent erosion at 10,453 m3 per year. The primary drivers of sediment redistributed were driven by seasonal reversal of longshore currents ¿ flowing northeast to southwest during the northeast monsoon and reversing during the pre- and southwest monsoon. Using the Digital Shoreline Analysis System (DSAS), predictive modelling indicated sustainable future landward migration of the HTL under prevailing conditions. If trends continue, several vulnerable zones along the Vizianagaram coast are projected to experience pronounced shoreline retreat within 10-20 years, posing risks to infrastructure and coastal communities. This integrated approach, combining beach profile analysis, 3D modelling of profiles, ArcGIS shoreline mapping and DGPS-derived HTL demarcation, demonstrates the effectiveness of multidisciplinary tools for shoreline monitoring and prediction. The finding provides critical inputs for coastal zone management, emphasizing the need for proactive strategies such as shoreline protection measures, managed retreat in sensitive areas, and stringent regulation of development activities near HTL. |
| Keywords | Keywords: Shoreline Evolution, High Tide Line, DGPS Survey, HTL mapping, DSAS |