Influence of suspended sediment loads on coastal hydrodynamics at Vengurla and Ratnagiri part of the Western Coast of India

Autor: Sathish Sathasivam, Padmini Gunasekaran, Umamaheswari Murugan, Roop Singh Kankara, Rathinam Arthur James, Thanabalan Palanisamy
Rok vydání: 2021
Předmět:
Zdroj: Arabian Journal of Geosciences. 14
ISSN: 1866-7538
1866-7511
Popis: In coastal processes, suspended sediment concentration (SSC) profoundly influences the erosion and accretion of beach patterns, and it also impacts coastal geomorphology, geology, fluvial, and hydrodynamic processes. The present study focused on two different coastal geomorphological locations such as Vengurla and Ratnagiri. To understand the SSC distribution, water samples were collected in nearshore areas with equal intervals of water depths at Vengurla (5 m, 10 m, and 15 m) and Ratnagiri (10 m and 15 m depths) for three different seasons (pre-monsoon, monsoon, and post-monsoon) and an OBS-5 + was also used to measure the SSC. The measured hydrodynamic parameters were used in the present study; in Vengurla, the mean current speed at 5 and 15 m water depth is 4.29 cm/s and 9.97 cm/s. In Ratnagiri, the mean current speed at 10 m and 15 m water depths are 7.69 cm/s and 10.64 cm/s, respectively. Vengurla and Ratnagiri have nearshore wave heights of 0.3–1.2 m and 0.4–1.5 m, respectively. The mean wind speed of Vengurla is 1.8 m/s. Shoreline change analysis was carried out using the historical topographical map (1956) and satellite images (1990–2014) to understand the spatial variability of SSC and its impact on coastal processes. The shoreline change analysis shows a significant erosion rate for Vengurla (42.5%) and Ratnagiri (33%). It was confirmed that the rate of changes in SSC was prominent due to the seasonal impacts among those sites. Overall inference shows that the SSC is relatively high on the Ratnagiri coast during monsoon due to cliff retreat and deposition from hinterland side to seaward side other than pre and post-monsoon periods.
Databáze: OpenAIRE
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