Assessment of Evolution of Diverging Spits across the Tropical River Mouths, Central West Coast of India

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Assessment of Evolution of Diverging Spits across the Tropical River Mouths, Central West Coast of India

March 3, 2021 Environment and Earth Science 0

The development of spits is caused by a high sediment supply and a lack of accommodation. The importance of spits in understanding sediment drift and inlet morphodynamics cannot be overstated. Remote sensing data, seasonal variations in foreshore profiles, textural characteristics of foreshore sediments, and wave-current patterns are used to investigate the evolution of a diverging spit, one rising northward and the other southward across the Baindur and Yadamavina River mouths along India’s Central West Coast. Between 1973 and 1989, remote sensing data revealed a 168-meter lengthening of the southern spit across the Yedamavina River, while the northern spit across the Baindur River remained relatively constant. In both the northern and southern spits, finer sediments were found at the ends of the spit. Between March and May, waves approach from the west, causing wave separation and convergence, which causes sediment movement on both sides. From October to November, the alongshore current is northward, and from December to February, it is southward. This reversal in the direction of alongshore drifts, combined with the high wave divergence found in this tropical environment, favours sediment movement on both sides, resulting in diverging spits. Because of the diverging spits, both rivers’ mouths are shifting in opposite directions, causing erosion on the opposite bank. The sediment flux to the central part of the mainland shoreline from which sediments pass either side leading to spit development must be tested in order to avoid erosion due to changing river mouths. Based on the above, we infer that a sediment divider, alongshore drift on both sides of the divider, sediment influx, and a sheltered effect are all needed for diverging spits to form.

Author (s) Details

Dr. V. S. Hegde
SDM College of Engineering and Technology, Dharwad, Karnataka, India.

Dr. P. A. Krishnaprasad
SDM Institute of Technology, Ujire, Karnataka, India.

Dr. R. Shalini
Global Academy of Technology, Bangalore, India.

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