GIS analysis for vulnerability assessment of salt damage on coastal agricultural fields: a case of Taro Patch in the Republic of Palau
N Yamada, K Noda, M Kimura, A Iida and K Soaladaob
Published under license by IOP Publishing Ltd
IOP Conference Series: Earth and Environmental Science, Volume 200, conference 1
Due to the global climate change, sea level rise and storm surges are worried to accelerate salt damage to coastal agricultural fields. The Republic of Palau, a small island nation in the Pacific Ocean is suffering from increasing taro patch abandonment. The purpose of this paper is to clarify the characteristics of taro patches which are damaged by seawater based on the GIS analysis and clusterings, such as elevation, distance from the sea, slope, catchment area, and area of a taro patch. The target area was the Babeldaob Island, which is the largest island in Palau. The results showed that the taro patches were mostly distributed in less than 10 m in elevation, within 1 km in distance from seawater and on slopes below 3%. We divided taro patches into two clusters by k-means clustering; cluster 1 which the elevation was low with catchment area and area of taro patch were small; cluster 2 which the elevation was high with catchment area and area of taro patch were large. These results imply that the large catchment area might lead to suppression of salt damage.