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1987 Fiscal Year Final Research Report Summary

A Study for Utitizaion of the stream-tube model for analysis of diffusion phenomena in Japanese rivers.

Research Project

Project/Area Number 61460166
Research Category

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

Allocation TypeSingle-year Grants
Research Field Hydraulic engineering
Research InstitutionToyohashi University of Technology

Principal Investigator

YOTSUKURA Nobuhiro  Professor, Toyohashi University of Technology, 工学部, 教授 (00182840)

Co-Investigator(Kenkyū-buntansha) NAKAMURA Shunroku  Associate Professor, Toyohashi University of Technology, 工学部, 助教授 (10023300)
Project Period (FY) 1986 – 1987
KeywordsTurbulent Diffusion In Open Channel Flows / Transport Model For open Channel flows / Two-Dimensional Advection Diffusion / 開水路の溶存質濃度
Research Abstract

Major objectives of the research have been to evaluate, adapt, and utilize in Japanese rivers the stream-tube model for solute transport, Which was developed by the principal investigator while he was in U.S.A.
Duting the two-year period ending March, 1988, hiwever, experimental phases of the research namely, field site evaluation of the model and laboratory-flume tests of the two-equation model. could not be executed satisfactorily, partly because of the lack of facilities and equipements at the laboratory of the University. Some 80% of the Grant fund was spent in purchasing and installing necessary equipments and facilities, so that empirical phase of the research will continue in the future
Major accomplishment of the research is an in-depth reevaluation of the stream-tube model based on recent North American and European information. Important conclusions are as follows. 1) The model is one of the most suitable two-dimansional model for unsteady transport in steady non-uniform open-channel flows. 2) Analysis of transverse dispersion coefficients in non-uniform rivers requires a new approach beyond Taylor's dispersion theory. 3) Nondimensionalized transverse dispersion coefficients for huge rivers like the Amazon are not much different from those for small rivers and laboratory flumes, thus the effect of river scale is nonexistent. 4) In adapting transport models to Japanese rivers, a two-equation model is needed to take account of solute exchange between the main flow zone and the dead zone. 5) So long as a first-order decay is assumed, the description of nonconservative solute in two-dimensional transport can be related to that of conservative solutes
Two papers describing the above results were completed and will soon be submitted to outside journals for publication.

  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] 四倉信弘: 土木学会論文集.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nobuhiro Yotsukurs: Water Resources Research.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nobuhiro Yotsukura: "The stream-tube model for transport of dissolved material in natural rivers" Proceedings of Japan Society of Civil.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nobuhiro Yotsukura: "Steady-state solutions for concentration of a solute with first-order decay in a river" Water Resources Research, American Geophysical Union.

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

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Published: 1989-03-30  

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