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A decomposition of α-continuity and αgs-continuity

Jafari S., Viswanathan K., Rajamanickam M.

Fasciculi Mathematici

2009

Nr 41

73-79

The main purpose of this paper is to introduce the concepts of η*—sets, η*—sets, η**— continuity and η**— continuity and to obtain decomposition of α—continuity and αgs—continuity in topological spaces.

Appraisal of tsunami inundation and run-up along the coast of Kanyakumari District, India - GIS analysis

Chandrasekar N., Immanuel J.L., Sahayam J.D., Rajamanickam M., Saravanan S.

Oceanologia

2007

No. 49 (3)

397-412

On 26 December 2004, a tsunami severely affected almost all the coastal villages of Kanyakumari District, India. It was one of the worst affected coastal sectors of South India. An attempt has been made here to assess the impact of the tsunami hazard on coastal landforms and the level of inundation using GIS techniques. The areas of inundation were surveyed and mapped by fixing regular transects along the coastal regions. The percentage of inundated area in the total area was estimated. It was found that inundation was higher on low-lying coasts and relatively less on elevated coasts. In some cases, the extent of inundation was a few kilometres in relation to other coasts, but the percentage of inundated area in the total coastal area was high. The extent of inundation along the study area varied from 50 m to 450 m. Inundation was minimal in coastal villages like Kanyakumari, Agastheeswaram, Madhysoodhanapuram and Dharmapuram, but extensive at Colachel. The percentage of inundated area in the total area ranges from 8% (Dharmapuram) to 39% (Colachel). The degree of inundation was controlled by coastal geomorphological features such as sand dunes, cliffs, coastal vegetation, nature and configuration of the beach, not to mention the angle and velocity of the invading tsunami surge.