Download e-book for iPad: Advances in River Sediment Research by Shoji Fukuoka, Hajime Nakagawa, Tetsuya Sumi, Hao Zhang

By Shoji Fukuoka, Hajime Nakagawa, Tetsuya Sumi, Hao Zhang

ISBN-10: 1138000620

ISBN-13: 9781138000629

ISBN-10: 1315856581

ISBN-13: 9781315856582

Sediments, which represent the skin of the Earth, begin their trip to rivers with the strength received from rainfalls, fl oods and different average approaches. as a result of delivery of sediments, rivers enhance with a number of appearances and services, and play an important function within the actions of people and the lifestyles cycles of different species. River sediment, as a standard subject for river administration, has been the Read more...

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1 INTRODUCTION Langendoen & Simon 2008, Luppi et al. 2009, Osman & Thorne 1988, Rinaldi et al. 2004, Simon et al. 2000). At the same time, several complex mathematical models that combine bank stability models and sediment-flow models are developed to simulate the river evolution with bank erosion and show effective performance to some extend (Chen & Duan 2008, Darby & Thorne 1996, Langendoen et al. 2009, Nagata et al. 2000, Wang et al. 2004). However, most bank failure models require large detailed field data to calibrate key parameters incorporated, especially geotechnical parameters to which these models are sensitive (Langendoen & Simon 2008, Parker et al.

In particular, it is true for a reservoir that locates at the uppermost part of the watershed and whose sediment is coarse. Here, I propose a new system that is applicable to such a reservoir. The system is comprised of the following facilities: A sedimentation pool is constructed near the upstream end of the reservoir by installing a partition weir if the reservoir is newly constructed or by the excavation of the delta deposit if sediment is already accumulated considerably in the reservoir. The crest height of the partition weir or that of the downstream bank of the excavated pool is set around the high water level of the reservoir.

02 mm are settled down onto the bottom of the sedimentation pool in front of the front-set bed of the delta deposit. Thus deposited fine sediment together with the coarser sediment that forms the delta deposit is flushed out via the bypass tunnel with the introduction of the reverse flow. When a large-scale flood flows in, the turbid water within the flow becomes dense enough to generate a density current in the sedimentation pool. 045 in volume. 075 g/cm3. 075 g/cm3. 733 m/s2. 6 g ′ hp3 (1) where q is the discharge per unit width and hp is the depth at the plunging point.

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Advances in River Sediment Research by Shoji Fukuoka, Hajime Nakagawa, Tetsuya Sumi, Hao Zhang

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