Browsing by Author "Abhijith, P.A."

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Effect of emerged coastal vegetation on wave attenuation using open source CFD tool: REEF3D
(Springer, 2019) Hunasanahally Sathyanarayana, H.S.; Suvarna, P.; Abhijith, P.A.; Prabhu, A.S.; Umesh, U.; Kamath, A.
Coastal vegetation is a soft solution for protecting the coast from the action of waves by attenuating the wave height and reducing the energy of the waves. Effect of wave height attenuation as a result of the presence of emerged coastal vegetation is studied numerically by resolving the Reynolds-averaged Navier–Stokes (RANS) equations. A three-dimensional numerical wave tank model is simulated using an open source computational fluid dynamics (CFD) software REEF3D, and wave attenuation due to emerged coastal vegetation is determined. An artificial, rigid, emerged vegetation for a length of 2m is developed in a numerical wave tank of REEF3D. The model is tested for regular waves of height 0.08, 0.12, and 0.16 m and wave periods of 1.8 and 2 s in a water depth of 0.40 and 0.45 m. The wave heights are measured at different locations along the vegetation meadow at 0.5 m intervals. The devolved numerical model is corroborated by comparing the obtained numerical results with the experimental results as reported by John et al. (Experimental investigation of wave attenuation through artificial vegetation meadow, ISH—HYDRO, [1]). The numerically obtained results are concurrent with the experimental results. © Springer Nature Singapore Pte Ltd. 2019.
Modelling and Mitigation of Urban Floods: A Case Study in Mangalore
(Springer Science and Business Media Deutschland GmbH, 2024) Pai, A.; Mahima, N.; Umesh, P.; Abhijith, P.A.
Urban flooding is a growing concern in many cities around the world, particularly in areas that are prone to heavy rains. In this study, we focused on a small drain catchment in an urban area in Mangalore and simulated the actual conditions of the drain to replicate what is found in the field. An extreme rain event was input into the PCSWMM software to find out the flooding conditions, which were then calibrated based on the flooding that had taken place during this particular rain event. We then redesigned the drains at the required portions to make the flooding conditions zero for the extreme rain event. This work is a small part of a larger project that aims to explore various techniques to reduce stormwater flooding in urban areas using structural, non-structural, and lid techniques. The results of this study provide insights into the effectiveness of this approach in mitigating urban flooding, and can serve as a basis for further research in this area. Â© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
Standardizing LiDAR Surveying Practices for Accurate and Consistent Data Collection: Colorizing Point Clouds
(Springer Science and Business Media Deutschland GmbH, 2024) Vishwas, A.S.; Abhijith, P.A.; Umesh, P.; Gangadharan, K.V.; Rai, S.
This paper discusses the importance of standardizing LiDAR surveying practices to ensure accurate and consistent data collection and analysis. Light Detection and Ranging (LiDAR) is a remote sensing technology that uses laser pulses to measure distances and create 3D maps of the environment. With the increasing use of LiDAR in various industries, it is crucial to establish standardized procedures for data collection, processing, and reporting. The paper reviews current practices and identifies key areas that require standardization, including data acquisition parameters, quality control. The benefits of standardization include improved data qualityÂ andÂ coloring the point cloud which improves visual interpretation. The paper discusses a simplified software algorithm for merging the point cloud and the panoramic image, which uses open-source hardware and software which provides scope for further modification and improvement. Â© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.