沖縄島北部サンゴ礁の表層堆積物への赤土砂流出の影響

概要

論文の詳細を見る
Distribution of upland sediment (red or yellow soil named lacally Kunigani maji) over Ginoza coral reef was verified by analyzing the physical, chemical and mineralogical properties of the surface sediments and this result was compared with the Landsat TM data analysis by Okamoto et al. (1992). In most area of the reef crest side area where Landsat TM data showed no effect of upland sedimet, the particle size of almost all of the sediments was larger than 0.2mm, which were composed of the fragments of corals. The hue of all materials depositted in this area was close to 1Y and the total iron content was less than 0.2%. In the shore side where Landsat TM data showed obvious effect of upland sediments, the sand fraction composed of rock fragments was overwhelming. The hue of materials was 1OYR and the total iron content was more than 1%. The characteristics of sediments in the rear reef flat area were intermediate of former two areas. These results indicate that the compositions of the surface sediments deposited in Ginoza coral reef relate very well with upland sediment pollution estimated by Landsat TM data.
日本ペドロジー学会の論文
1996-06-30