タイ湾奥部マングローブ沼地における海岸侵食の実態と有効な対策

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  • Status of and Measures against Erosion of Mangrove Coast in the Upper Gulf of Thailand
  • タイワン オウブ マングローブ ヌマチ ニ オケル カイガン シンショク ノ ジッタイ ト ユウコウ ナ タイサク

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Coastal erosion has been a serious problem in the upper Gulf of Thailand. History of its coastline change was analyzed using aerial photos from 1954 to 2010. Abrupt erosion cases were observed around extended channels or after breaching of dikes of shrimp farming ponds while coastlines adjacent to coastal belt of mangroves with 400 m width or more were stable. Adopted countermeasures against the erosion were investigated at two sites where different types of structures, bamboo fences and revetments, were installed, respectively, on the basis of interviews, questionnaire surveys, wave measurements and surveying. A selection policy of measures and recommendations were proposed considering the cost, land use, local opinions and demands and physical properties of structures along with necessity of project evaluation.

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