Title Transcription
ゴウノカワ ノ エンスイ クサビ エンスイ ソジョウ ト ソノ ジョウリュウ ノ チカ エンスイ トノ カンケイ 1999ネン 12ガツ 2000ネン 2ガツ
Title Alternative
Saline Wedge at River Gonokawa, Shimane Pref., Japan : Saline Water Intrusion at Estuary River and its Relation to the Underground Water (Observation at a Period of Water Shortage during Dec.1999 - Feb.2000)
File
language
jpn
Author
Tokuoka, Takao
Ueno, Hiroyoshi
Nishimura, Kiyokazu
Suzaki, Satoshi
Matsuda, Shigeo
Kubota, Shunsuke
Suzuki, Shigenori
Ikeda, Tatsuhiko
Description
A new monitoring system for the observations of spatial and temporal movement of halocline occurring at boundary between fresh water (the low-salinity water) and salt water (the high-salinity water) has been developed and applied since 1992. The saline wedge (salt-water intrusion along the bottom of river) has been observed at the lower stream of River Gonokawa of Shimane Prefecture since 1997, and when discharge rate decreased below 50 m^3/s in 1999, we observed for two months that the head of saline wedge invaded up to 7.2 km. A groundwater well was installed at the riverbank for the observation of groundwater system. The well is 50 m in length and penetrates the alluvial sand and gravels. The preliminary results from this observation well indicate that the boundary between saline and fresh water in adjacent subsurface aquifer system moves downward when the discharge rate at the river increases. Consequently the movement of saline wedge is positively related with the boundary between saline and fresh water in subsurface aquifer system.
Subject
saline wedge
halocline
groundwater
Gonokawa
Journal Title
Laguna : 汽水域研究
Volume
8
Start Page
67
End Page
78
ISSN
21852995
Published Date
2001-03
NCID
AN10439529
Publisher
島根大学汽水域研究センター
NII Type
Departmental Bulletin Paper
Format
PDF
Text Version
出版社版
OAI-PMH Set
Estuary Research Center