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Title Transcription
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
Title Alternative (English)
Characteristics of pocket beaches in the western San’in coast, southwest Japan, and evaluation of geochemical maturity of beach sand
File
language
jpn
Author
Koakutsu, Kentaro
Sano, Erika
Description
 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.
Journal Title
島根大学地球資源環境学研究報告
Volume
29
Start Page
21
End Page
31
ISSN
13439774
Published Date
2010-12-27
NCID
AA11455176
DOI(SelfDOI)
Publisher
島根大学総合理工学部地球資源環境学教室
Publisher Aalternative
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
NII Type
Departmental Bulletin Paper
Format
PDF
Text Version
出版社版
OAI-PMH Set
Interdisciplinary Graduate School of Science and Engineering
Remark
12-14,16+ / 1993+
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