Analyses of the Recent Landform Changes Estimated from the Laser Data Obtained at Two Different Times in Uminonakamichi

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  • 2時期のレーザーデータによる海の中道における海岸地形の変化の分析
  • 2 ジキ ノ レーザーデータ ニ ヨル ウミ ノ ナカミチ ニ オケル カイガン チケイ ノ ヘンカ ノ ブンセキ

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Abstract

In this study, we discussed on the characteristics of landform and its change in Uminonakamichi, Fukuoka Prefecture from the elevation change estimated by the laser data in 2002 and 2007, a relief map made by the laser data in 2007, NDVI using the satellite data in 2006 and the field surveys.<br>The study area can be classified into 7 landforms; sand beach, coastal cliff, flat surface, dune 1, dune 2, dune 3 and parabolic dune on the basis of the relief map.<br>In the area S, where NDVI is less than 0, geomorphic processes in the 5 years from 2002 to 2007 were clarified. The first is that coastal current from northeast to southwest erodes existing dunes and it develops coastal cliffs and sand beaches. The second is that northern monsoon develops new dunes in the lee side of the coastal cliffs. The dune developing process is affected by the ability in interruption to sand moving and capture of sand at the forestation area. <br>In the area S, the elevation decreased more than 5 meters and increased more than 4 meters during the 5 years. The character of the elevation change indicates that there are the small area of coastal cliff with the larger decreasing of elevation and the large area of sand dune or sand beach with the smaller increasing of elevation. The averages of the elevation change were +0.61 meter at dune 1, +0.44 meter at sand beach, +0.15 meter at flat surface and －0.86 meter at coastal cliff. <br>The relationship between NDVI and elevation change indicates that the pine forests at dune 1 caught a large amount of sand and that coastal cliff changed into sand beach by headward erosion.

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