Type of Damage
Impacts of subsidence on coastal areas
Damage and recovery capacity
Tsunami in perspective
SKETCHING IMPACTS OF THE TSUNAMI ON PADDY FIELDS
Machilipatnam area, Andhra Pradesh. 18 Dec (left) and 27 Dec (right)
High velocity of the front wave and recession front provoking erosion and scouring.
Possible destruction of bunds
Duration of flood
Several hours for well drained lands to several days and weeks for poorly drained fields.
Minimum drainage to nearby field
Salinization due to infiltration
Limited to only few millimetres of salted water for well drained areas.
High for long duration of inundation (A value of 5 to 10 mm of infiltration per day might be consider for paddyfield considering the usual values of deep percolation below the puddled layer)
Salted deposit thickness can reach up to 30 cm. Part of the initial deposit can also be eroded during rapid recession flows if the area is well drained.
Salted deposit thickness can reach up to 30 cm.
Low deposit due to low water depth.
High deposit where inundation lasts.
example of high vulnerable area: coastal paddyfields bordeing saline lowlands (on the right)
less vulnerable area further upstram
example of possible zonation of affected areas
© FAO, 2005