1. C.A. Onstad and A.J. Bowie, Basin sediment yield modelling using hydrological variables. 2. T. Mizutani, Erosion processes in mountain basins in humid regions. 3. I. Bogardi, L. Duckstein, F. Szidarovszky andM. Fogel, Reservoir sedimentation under uncertainty: analytic approach versus simulation. 4. J.P. Bennett and CF. Nordin, Simulation of sediment transport and armouring (Papers 1 and 2 were published in IAHS Publication no. 122; papers 3 and 4 are in this issue of the Bulletin) SUMMARY OF PAPERS SUBMITTED All the papers reviewed in this section emphasize the need for better assessment techniques for sediment processes. Each paper examines a different aspect of the subject and presents a mathematical model approach. The paper by Onstad and Bowie considers two aspects of sediment modelling, namely the assessment of discrete storm sediment yield for single storm events and the assessment of annual sediment yields and sources for complete areas. The three models considered in the former assessment include one by Onstad and Foster, one by Williams and the third on
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