Geomorphology of Adyar River estuary, Chennai, India

The Adyar river drains into the Bay of Bengal and forms an estuary behind the Theosophical Society near MRC Nagar, Chennai.  Small dunes are visible and thick alluvium covers the Archaen rocks. The river supplies sediment heavily to continually alter the geomorphology of the unique environment. A broken bridge adds a bit of drama to the landscape.  Would be interesting to see how much the 2004 Indian Ocean Tsunami has altered the features. The estuary is small but can probably be classified as a depositional and semi-lagoon spit type.