CHARACTERIZED BY A COARSER SURFACE LAYER OF SEDIMENT ARMOUR KARAKTERISTIK KEKASARAN LAPISAN DASAR SEDIMEN ARMOUR

Ikhsan, Cahyono and Raharjo, Adam Pamudji and Legono, Djoko and Kironoto, Bambang Agus (2011) CHARACTERIZED BY A COARSER SURFACE LAYER OF SEDIMENT ARMOUR KARAKTERISTIK KEKASARAN LAPISAN DASAR SEDIMEN ARMOUR. Dinamika Teknik Sipil, 11 (3). ISSN 1441-8904

[img]
Preview
PDF - Published Version
Download (1667Kb) | Preview

    Abstract

    The static armored bed condition exists as a result of an extended period of flows over a mixed gravel bed. The flows generate shear stresses less than that needed to entrain the largest particles but large enough to transport the fines and over time the fines sediment is winnowed from the bed surface. A coarse surface layer forms on the bed surface, effectively sheltering the finer substrate grains from entrainment. The presence of an armour layer on the bed surface is a common phenomena in rivers. The flume experiment was 0.6 m wide by 10 m long and inclined at a slope of 1% and 1,5%. The channel bed and feed were composed of a moderately to poorly sorted, lognormally distributed mixture of sand and gravel. The feed rate was 100 g/min for the initial experimental runs. Digits to the right of the decimal refer to irregular intervals (0 min-440 min) during the same feed rate between times when the experiment was temporarily halted and measurements of the bed were made.). Water discharge was held constant at 40 It/s. The paper presents a relatively has been applied to replicate bedload transport measured during static armouring flume experiments. The model proved to be able to simulate well the vanishing sediment transport due to both slope reduction and surface coarsening. Key words: armour layer, degradation, sediment transport, coarser

    Item Type: Article
    Subjects: T Technology > TA Engineering (General). Civil engineering (General)
    Divisions: Fakultas Teknik
    Depositing User: Arissa Aprilia Nurcahyani
    Date Deposited: 10 May 2014 05:48
    Last Modified: 10 May 2014 05:48
    URI: https://eprints.uns.ac.id/id/eprint/15702

    Actions (login required)

    View Item