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Water 2016, 8(4), 166; doi:10.3390/w8040166

Experimental and Numerical Study of Bottom Rack Occlusion by Flow with Gravel-Sized Sediment. Application to Ephemeral Streams in Semi-Arid Regions

Hidr@m Group, Department of Civil Engineering, Universidad Politécnica de Cartagena, Paseo Alfonso XIII, 52, 30203 Cartagena, Spain
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: Y. Jun Xu
Received: 2 February 2016 / Revised: 6 April 2016 / Accepted: 14 April 2016 / Published: 21 April 2016

Abstract

Rainfall runoff collection in ephemeral streams is an objective in semi-arid zones. Rack intake systems are proposed to collect these flash floods with intensive sediment transport. The design parameters address the problem of clogging the spacing between bars. Experiments for two different void ratio racks are shown. Flows, longitudinal slopes in the rack, and water with three gravel-sized sediments were tested. Results such as effective void ratio due to the gravel deposition over the rack, the evolution of the flow rejected during each test, and the quantification of materials collected and deposited, are presented. The optimal longitudinal rack slope seems to be close to 30%. The effective void ratio is related to several hydraulic parameters calculated at the beginning of the rack. Some adjustments were proposed to predict the effective void ratio. View Full-Text
Keywords: semiarid region; bottom intake system; racks; gravels; laboratory measurements; numerical simulation; sediment transport semiarid region; bottom intake system; racks; gravels; laboratory measurements; numerical simulation; sediment transport
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Castillo, L.G.; García, J.T.; Carrillo, J.M. Experimental and Numerical Study of Bottom Rack Occlusion by Flow with Gravel-Sized Sediment. Application to Ephemeral Streams in Semi-Arid Regions. Water 2016, 8, 166.

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