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total load transport in gravel bed and sand bed rivers case study:Chelichay watershed

International Journal of Sediment Research 2013年第1期28卷 46-57页

作者： Arman HADDADCHI Mohammad H.OMID Amir A.SDEHGHANI School of Environmental and Rural Science University of New England Dept.of Irrigation and Reclamation Engineering University of Tehran

Field experiments were conducted on total load transport in the Chelichay River Basin,a mountainous catchment （1,400 km;） located in north eastern of Iran,to evaluate total load formulas including four gravel bed rivers and a sand bed river（Qaresoo River）.Gravel bed rivers in Chelichay River Basin can be grouped into two types;steep slope rivers with high shear values（Chehelchay River and Khormaloo River） and mild slope rivers with low shear values（Narmab River and Soosara River）.Two depth integrating suspended load samplers（DH-48 and D-49）,and two bed load samplers（Helley-Smith and BLSH） were used to measure total *** performance is tested of 8 total load transport formulae including 4 macroscopic and 4 microscopic methods.A systematic and thorough analysis of 59 sets of data collected from sand bed river indicate that Yang and Engelund and Hansen reach to the better results, and from four gravel bed rivers confirmed that the methods of Karim and Kennedy and Engelund and Hansen yields the best results for steep slope rivers,and the methods of Einstein and Bijker are ranked highest in gradual slope rivers.

关键词： Sediment total load Gravel Sampling

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Group scheduling with general position-dependent effect

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Journal of Southeast University(English Edition) 2012年第3期28卷 354-359页

作者：虞先玉张玉林张玉环东南大学经济管理学院南京211189 东华理工大学理学院南昌330000

In order to investigate more realistic group scheduling problems with position-dependent effects,the model of general position-dependent group scheduling is proposed,where the actual group setup times and actual processing times are described by general functions of the normal group setup time and position in the *** general functions are not assumed to have specific function structures,and are not restricted to be *** mathematical analysis and proof,each considered problem is decomposed into a group scheduling process and a job scheduling process,and each scheduling process is transferred into the classic assignment problem or the classic single-machine sequence problem,and then the computational complexity to solve the considered problem is *** results show that,even with general position-dependent job processing times,both the single machine makespan minimization group scheduling problems and the parallel-machine total load minimization group scheduling problems remain polynomially solvable.

关键词： group scheduling position-dependent makespan total load

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