学会誌「自然災害科学」

衛星及び地上リモートセンシングを利用したサトウキビ塩害の調査解析と塩害対策の提言

Sugar Cane Damage Caused by Typhoon-Brought Salt Water and Its Countermeasure Proposals Based on Remote Sensing Techniques

後藤 恵之輔*・後藤 健介**・金 應南***

Keinosuke GOTOH*, Kensuke GOTO** and Eung-Nam KIM***

Abstract

As a result of the windy with little rain Typhoon 9713 which passed around the vicinity of Nansei Islands, Japan on August 18, 1997, a lot of salt damages occurred on the sugar cane fields. In order to evaluate these damages the ground remote sensing technique together with the Landsat Satellite data were used. At first as of the in-situ investigation by using the ground remote sensing technique such as a portable photometer and a thermal infrared camera at Amami-Oshima Island it was cleared that the damages occurred on the sugar cane farms by the salt water can be easily observed. Secondly, through the analysis of the Landsat Satellite data it was found out that the damaged areas in Amami-Osima and Kikaishima islands can be detected by evaluating the normalized difference vegetation index (NDVI) . Finally, based on these investigations the authors proposed that early detection with the ground remote sensing, the exact grasp of damaged areas using the satellite data and sprinkling with water sprinklers or vacuum cars are effective as the countermeasure against salt damages of suger cane fields.

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