Kalla kadal is Malayalam word having literal meaning of 'sea thief'. The word kalla kadal, which is used by local fishermen was adopted by UNESCO. Geographically, it refers to phenomenon when the sea water creeps in during good weather like a thief arriving unannounced.
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Reason for withdrawal of sea
Sea creeps into coast because of swells generated by storms elsewhere. Travelling thousands of kilometres across entire ocean basins, the swell becomes amplified when it encounters a coastal current, resulting in increased wave setup, a phenomenon referred to as remote forcing. For example, kalla kadal occurs in pre monsoon season in South India, where swells are generated near Antarctica.
Characteristics of kalla kadal
Characteristics of “Kallakkadal” as follows:
References
Kalla kadal Wikipedia(Text) CC BY-SA