Subsidence impacts on coastal areas
Tsunami in perspective
SALT AFFECTED LAND ASSESSMENT
The first step in dealing with affected agricultural lands by tsunami is to zone the damages in major categories for which later on solutions will be field test and implemented.
Zoning the damages
Damages are different by
Direct crop destruction by uprooting, salt poisoning, flood, etc...
Erosion and scouring that modifies the topography, land levelling and the elimination of bunds (for paddy fields)
Soil fertility losses when upper layer is washed away
Deposition of salted sediment
Trash and debris accumulation.
which depends on three main characteristics of the particular location:
the energy of the flood,
the type of soil coverage and vegetation, and
the soil hydraulic properties including drainage capacity.
As rice is the main crop in the region FAO-AGLW proposes below an example of approach developed for paddyfield but which can be easily extrapolated to any particular other crop.
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Sketching impacts of the tsunami on paddy fields
FAO Field guide:The impact of salt water on agricultural land in Aceh Province.
20 hal untuk diketahui tentang dampak air laut pada lahan pertanian di propinsi NAD
Soil salinity assessment: methods and interpretation of electrical conductivity measurements
The use of saline waters for crop production
Water quality for agriculture
Water Resources, Development and Management website
© FAO, 2005