number of downloads : ?
Title Transcription
シンジコ セイブイキ ノ コテイ チケイ ト タイセキソウ
Title Alternative (English)
Topography and sedimentary layers of the westem part of Lake Shinji by echosounding
File
language
jpn
Author
Tamura, Yoshiyuki
Naka-no-umi and Shinji-ko Research Group
Description
The western part of Lake Shinji was surveyed by SH-20 echosounder to determine the topography and sediment layers to a depth of about 20m.Here,the Hii River Delta develops eastward,forming a subaqurous channel with natural levees on both sides.By comparing the present results with the bottom topography surveyed during 1962-63 by the Geographical Survey Institute,the Hii River Delta is shown to have prograded eastward about 1.5km.Several reflected layers are discovered in the bottom sediments.These layers increase in number toward the river mouths.To determine the composition of these reflectors,a 1.4m long sample was taken by gravity coring and was studied by soft-X Ray and grain size analyses.Two coarse layers were identified,which correspond to the reflected layers.These two layers are assinged to be flood deposits at A. D. 1934 and A. D. 1635,respectively.The rate of sedimentation is evaluated at 2-3mm/y(before 1635),3-4mm/y(between 1872 and 1934)and 7mm/y(after 1934).
Journal Title
島根大学地球資源環境学研究報告
Volume
12
Start Page
53
End Page
66
ISSN
13439774
Published Date
1993-08-30
NCID
AA11455176
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
OAI-PMH Set
Interdisciplinary Graduate School of Science and Engineering
Remark
12-14,16+ / 1993+
他の一覧