Vol. 6 No. 3 CHIN. J. (X:EANOL i,IMNOI,. 1988

NEWS THE XXIII CONGRESS

OF THE INTERNATIONAL ASSOCIATION RESEARCH (IAHR)

FOR HYDRAULIC

Organized by the National Research Council Canada and Environment Canada, will be held at the Westin Hotel, Ottawa, Ontario, Canada, August 21-25, 1989.

The aim of the XXIII Congress is "To communicate new knowledge of hydraulics and its uses in engineering and environmental science". Activities at the Congress will include Technical Presentations, Seminars, Poster Sessions, Video Presentations, Special Lectures, and a Special Student Session.

The overall theme of the Congress is "Hydraulics and the Environment" with four main sub- themes:

A. Turbulence in Hydraulics (Chaired by Professor W. Rodi, University of Karlsruhe, F.R.G.)

B. Fluvial Hydraulics (Chaired by Professor M.S. Yalin, Queen's University, Kingston, Canada)

C. Maritime Hydraulics (Chaired by Dr. E. Mansard, National Research Council Canada, Ottawa, Canada)

D. Environmental Hydraulics (Chaired by Dr. B. G. Krishnappan, National Water Research Institute, Environment Canada, Burlington, Canada)

Persons interested in receiving the first bulletin or further information on the Congress are requested to contact:

K. Charbonneau Conference Services Office National Research Council Canada Ottawa, Ontario, Canada KiA OR6 Telephone: (613) 993-9009 Telex: 053-3145 Fax: (613) 993--0603

Fig. 2 Comparison between processed and unprocessed images of Qingdianwa Lowland

a. Image processed with contrast enhancement

b. Unprocessed image

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Fig. 3. Image processed by matching Sa, M4 and T4

a. Ratio composite

b. 1HS color transformation

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Fig. 1 Density difference in and outside the old channel in different seasons

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Fig. 4 Sketch map on the moving range of the lower reaches of the Huanghe River since the Spring and Autumn Period