Status : Accepted for Review/Revision
Personal Name Gatdula, Nerissa B.
Resource Title GIS-based assessment of vulnerability of coastal agriculture to seawater intrusion
Date Issued June 2019
Abstract Agricultural vulnerability is the manifestation of sensitivity and adaptive capacity of agricultural resources to climate variability. It extends with the degree of exposure and sensitivity to impacts of hazards and risks considering limited adaptation capabilities. Seawater intrusion is the landward movement of saline water into freshwater aquifers. Movement of freshwater-saltwater interface affects the coastal farmlands in multiple means, among others through groundwater upconing and pumping from coastal wells, increase in sea-level rise or storm surge which may result to coastal inundation into low lying farmlands, and increase in concentration of salt in brackish water which may upsurge the effect of drought. The objective of this research was to assess the vulnerability of coastal farmlands in Kalibo, Aklan, Philippines to seawater intrusion. Assessment was based on the indicators of exposure, sensitivity and adaptive capacity. The analysis of vulnerability factors have been restricted to the extent of available datasets. Exposure indicators included land cover map, distance to shoreline, rate of sea-level rise, elevation of land area, vegetation and salinity indices, extraction rate and levels, and hydraulic property. Sensitivity and adaptive capacity indicators were administered to household surveys. Weights for each indicators were determined using the Analytic Hierarchy Process (AHP) and were combined using different aggregation methods. Results were integrated to collectively assess the vulnerability. Assessment shows that Barangay Caano was identified as the most vulnerable with moderately low to moderately high ratings and Bachaw Norte as the least vulnerable with low to moderately low ratings. The exposure map shows Barangay’s Nalook, Estancia, and Caano for having the highest exposure levels. Assessment aimed in benefiting decision makers, local and national stakeholders through improvement of knowledge and expanding awareness to seawater vulnerability. This research was also done to better understand the indicators crucial in improving the current status of Kalibo thereby, result to better planning and management approach.
Degree Course Master of Science in Geomatics Engineering
Language English
Keyword Agricultural Vulnerability, Exposure, Sensitivity, Adaptive Capacity, Seawater Intrusion, Coastal Farmlands, AHP
Material Type Thesis/Dissertation