GIS analysis for vulnerability assessment of salt damage on coastal agricultural fields: a case of Taro Patch in the Republic of Palau
GIS analysis for vulnerability assessment of salt damage on coastal agricultural fields: a case of Taro Patch in the Republic of Palau
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DOI：
10.1088/1755-1315/200/1/012008
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发表时间：
2018-11
期刊：
影响因子：
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通讯作者：
N. Yamada;K. Noda;M. Kimura;A. Iida;K. Soaladaob
中科院分区：
文献类型：
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作者：
N. Yamada;K. Noda;M. Kimura;A. Iida;K. Soaladaob
由于全球气候变化，海平面上升和风暴潮令人担心会加速沿海农田的盐渍破坏。帕劳共和国是太平洋上的一个小岛国，它正在遭受越来越多的芋头种植地被遗弃的痛苦。本文旨在通过GIS分析和聚类，明确海水破坏芋头斑块的高程、离海距离、坡度、集水区面积、芋头斑块面积等特征。目标地区是巴别尔道布岛，这是帕劳最大的岛屿。结果表明：芋头斑块主要分布在海拔10 m以下、距离海水1 km以内、坡度3%以下的区域；采用k-means聚类方法将芋头斑块分为两类；聚类1海拔较低，集水区面积和芋头斑块面积较小；聚类2海拔高，集水区面积大，芋头斑块面积大。这些结果表明，较大的集水区可能会抑制盐害。
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.