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タイトルヨミ
サンイン カイガン セイブ ノ ポケット ビーチ ノ トクチョウ ト ゲンソ ソセイ カラミタ セイジュクド
日本語以外のタイトル
Characteristics of pocket beaches in the western San’in coast, southwest Japan, and evaluation of geochemical maturity of beach sand
ファイル
言語
日本語
著者
小圷 健太郎
佐野 絵里香
内容記述(抄録等)
 The characteristics of beach sand in the western San’in coast are examined in relation to beach shape, grain size distribution, and geochemical compositions. The area examined covers the 82 km long coastline from Ohda to Masuda in western Shimane Prefecture, Japan. Thirty-two identical beaches occur along the coast. The longest of these is Mochiishi beach (12.5 km), situated in the western part, and is characterized by seven composite sub-beaches. The average length of all beaches examined is 1.24 km. Seventeen beaches are less than 1 km in length, indicating that relatively small pocket beaches dominate in the western area. Radian values (arc length of the beach / the radius; ?/r) of <1 characterize short and concave pocket beaches. Thirteen beaches have ?/r values ?/r>1. Sand samples were collected from the shorelines in the foreshores of 32 beaches in March and April, 2010. Median grain size (d50) ranges from ?0.31 to 2.15(φ), and sorting is generally less than 0.35. SiO2 contents range from 70.66 to 89.50 wt%, with most samples containing more than 80wt %. SiO2 contents show negative correlation with sorting values. Al2O3 contents vary from 4.54 to 16.46 wt% and exhibit strong negative correlation with SiO2. Zr contents range from 55 to 100 ppm. Beaches less than 1km in length (L) have relatively higher ?/r values of over 1.0. Their ?/r ratios show weak negative correlation with both SiO2 content and SiO2 / Al2O3 ratios, suggesting significant sorting of quartz grains in small pocket beaches.
掲載誌名
島根大学地球資源環境学研究報告
29
開始ページ
21
終了ページ
31
ISSN
13439774
発行日
2010-12-27
NCID
AA11455176
出版者
島根大学総合理工学部地球資源環境学教室
出版者別表記
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
資料タイプ
紀要論文
部局
(旧組織)大学院総合理工学研究科
備考
12-14,16+ / 1993+
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