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2005 Fiscal Year Final Research Report Summary

Design method of environment in rivers with self-repairing functions in habitat

Research Project

Project/Area Number 16360264
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Civil and environmental engineering
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

KUSUDA Tetsuya  Kyushu University, Faculty of Engineering, Professor, 大学院・工学研究院, 教授 (50037967)

Co-Investigator(Kenkyū-buntansha) KUBA Takahiro  Kyushu University, Faculty of Engineering, Associate Professor, 大学院・工学研究院, 助教授 (60284527)
OHISHI Kyoko  Kyushu University, Faculty of Engineering, Research Associate, 大学院・工学研究院, 助手 (20110835)
YAMANISHI Hiroyuki  Saga University, Institute of Lowland Technology, Associate Professor, 低平地研究センター, 助教授 (20240062)
MATSUI Seiichi  Kyushu University, Faculty of Agriculture, Professor, 大学院・農学研究院, 教授 (60038297)
Project Period (FY) 2004 – 2005
KeywordsWatershed / Habitat / Preservation / Design of habitat / HEP / Deiratonotus japonicus / Gokase River / Kita river
Research Abstract

For the preservation of Deiratonotus japonicus, a small crab, which is a kind of less data species by Ministry of Environment, Japan, we conducted field surveys on the existing number and preference of it in the Kita River in the Gokase River System, Miyazaki, Japan. They had been decreasing from 3.5 millions since 2002 and hit the lowest, 50 thousands in 2005, and then slightly increases as of yet;. This seems due to natural fluctuation, but predation.
We utilized the Habitat Evaluation Procedure for investigating their preference and characteristics on behavior in the river. Their adults prefer rather large pebbles with 10-15mm in diameter and high salinity. On the other hand, their zoeas do low salinity. No tendency was found on light intensity.
Their bleeding was tried and succeeded in it from egg to zoea and sometimes to magalopa with S-type copepoda Its zoeas prefer high salinity, on the other hand its adults do opposite. In order to bleed them stably until megalopa, we need further work to choose baits.
We also tried to identify the species of crustacean by use of a gene technique. Contamination by shell caused severe problems on analysis, so that we must consider new techniques to avoid contamination.
A new model to simulate flow and salinity transport was developed. By using it, the movement of its zoeas were analyzed. As a result of it, its zoeas were estimated that they exist around the top of the salt wedge based on their preference. Because river morphology is a key in the relationship between the location of the top of the salt wedge and the size of deposits, we have to pay attention on the design of the river.

  • Research Products

    (2 results)

All 2006

All Journal Article (2 results)

  • [Journal Article] 北川感潮域に生息するカワスナガニ(Deiratonotus Japonicus)の幼生に関する研究2006

    • Author(s)
      楠田 哲也
    • Journal Title

      土木学会論文集 (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Zoeas of Deiratonotus japonicus in the Kita River2006

    • Author(s)
      Tetsuya, KUSUDA
    • Journal Title

      Journal of Japan Society of Civil Engneers No.8(in printing)

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

URL: 

Published: 2007-12-13  

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