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1995 Fiscal Year Final Research Report Summary

DEVELOPMENT OF LONG-TERM OBSERVATION SYSTEM OF THE HOLOCLINE IN COASTAL LAGOON

Research Project

Project/Area Number 06554019
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Geology
Research InstitutionSHIMANE UNIVERSITY

Principal Investigator

TOKUOKA Takao  DEPT.GEOSCIENCE,FAC.SCI.& ENGINEERING,SHIMANE UNIV., PROFESSOR, 総合理工学部, 教授 (30025358)

Co-Investigator(Kenkyū-buntansha) MATSUDA Shigeo  CLOVER ENGINEERING.Co.Ltd., DIRECTOR, 取締役社長
SUZAKI Satoru  SEMBONDENKI Co.Ltd., DIRECTOR, 取締役
NISHIMURA Kiyokazu  DEPT.MARINE GEOLOGY,GEOLOGICAL SURVEY OF JAPAN, 海洋地質部, 主任研究員
KAMEI Takeshi  DEPT.GEOSCIENCE,FAC.SCI.& ENGINEERING,SHIMANE UNIV., ASSOC.PROF., 総合理工学部, 助教授 (30177597)
SAMPEI Yoshikazu  DEPT.GEOSCIENCE,FAC.SCI.& ENGINEERING,SHIMANE UNIV., LECTURER, 総合理工学部, 講師 (00226086)
Project Period (FY) 1994 – 1995
KeywordsCOASTALLAGOON / NAKAUMI / HALOCLINE / ECHO-SOUNDING SURVEY / OXYGEN-POOR WATER MASS
Research Abstract

The survey system of long-term observation system of the halocline in coastal lagoon was newly developed and the resolution of underwater acoustic records in Lakes Nakaumi and Shinjiwere successfully checked. This survey system, which automatically provides a time-series of echo-sounding profiles, is dirrerent from the conventional type equipped on a boast. The tranducer is fixed on the lake bottom. The echo-sounding recordobtained by the new ststem is clear enough to distinguish the 5 permill halocline.
By using this system, we observed the halocline behavior at central and marginal place in Lake Nakaumi. Salinity, pH,dessolved oxygen, watertemperature, and water flow rate and direction were checked by the other equipments. This results suggested that the halocline was easily moved and that the behavior was influenced by wind.
The optical fiber sensor for measuring temperature distribution over long distance can produce simultaneous temperature data at up to 4000 points with an interval of 1 m along it. The experiments used jointly with the above echosounding system in Lake Nakaumi have resulted in two interesting discoveries. The one is the temporal change of warm spring activity on the lake bottom. The other is the movement of a mass of high saline water into low saline water lake bottom driven by meteolological forcing. The advantage of the optical fiber distributed temperature sensor is its ability to easily obtain the temperature data as function of time and space over a long distance.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 徳岡隆夫ほか 6名: "汽水湖中海における塩分踊層動態の長期観測" ラグナ(汽水域研究). 3(印刷中). (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 徳岡隆夫ほか 9名: "汽水域・塩分踊層の動態システムの開発(予報)" ラグナ(汽水域研究). 2. 21-27 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 西村清和ほか 3名: "光ファイバ分布型温度センサを用いた湖底湧水の探査" 物理探査学会論文集. 195-201 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 西村清和・松林 修: "光ファイバ分布型温度センサの海洋および湖沼調査への適用" 海洋調査技術. (印刷中). (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 西村清和ほか 5名: "塩水くさび調査のための水中音響探査機の開発" LAGUNA(汽水域研究). 1. 1-19 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 徳岡隆夫ほか 7名: "音波探査による中海の浮泥層と塩水くさびの検討(予報)" LAGUNA(汽水域研究). 1. 11-26 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tokuoka, T., Sampei, Y., Kamei, T., Tamari, K., Nishimura, K., Matsuda, S.and Suzaki, S.: "Long-term observation of the halocline in Lake Nakaumi Long-term observation of the halocline in Lake Nakaumi" LAGUNA. 3, (in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tokuoka, T., Takayasu, K., Sampei, Y., Seto, K., Inouchi, Y., Nishimura, K.Anma, K., Suzaki, S., Matsuda, S.and Tamanaka, T.: "Development of the long-term observation ststem for wedge-like saline layr formation in coastal lagoon (preliminary report)" LAGUNA. 2. 21-27 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nishimura, K., Matsubayashi, O., Urabe, T.and Kinoshita, M.: "Development of seafloor termometry system using optical fiber distributed temperature sensor for study of mid-ocean ridges" CONFERENCE PROC.OF OCEANS'95. 195-201 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nishimura, K.and Matubayashi, O.: "Application of an optical fiber disstributed temperature sensor to marine and lake surveys" TECH.MARINE SURVEY. 8 (in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nishimura, K., Anma, K., Tsuchiya, Y., Matsuda, S., Tokuoka, T.and Inouchi, Y.: "Development of an uderwater acoustic profiler for survey of wedge-like saline layr" LAGUNA. 1. 1-9 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tokuoka, T., Onishi, I., Sampei, Y.Seto, K.Tamura, Y., Takayasu, K., K.Anma, K., Tsuchiya, Y., S.Matsuda, S., Inouchi, Y.and Nishimura, K.: "A wedge-like saline layr in Lakes Nakaumi and shinji detected by sonic survey, and its significance" LAGUNA. 1. 11-26 (1994)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1997-03-04  

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