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Pumped rainfall simulators : the impact of rain pulses on sediment concentration and size.

Armstrong, Alona and Quinton, John (2009) Pumped rainfall simulators : the impact of rain pulses on sediment concentration and size. Earth Surface Processes and Landforms, 34 (9). pp. 1310-1314. ISSN 0197-9337

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Many pumped rainfall simulators used in soil erosion studies use pulsed rain to control the rainfall intensity. We examined the effect of the rain pulsing on sediment concentration and size using three different pulse cycles with the same rainfall intensity. There was considerable variation in sediment concentration through the pulse cycle: the highest concentration was up to four times that of the lowest concentration. Furthermore, the particle size distribution also varied: the peak median particle size was double the lowest median particle size. The magnitude of differences in sediment concentration and particle size were greater the longer the rain was off for and these dynamics will vary with between rainfall simulators and studies. We suggest the impact of the pulsing on sediment is significant and should be investigated prior to experimentation so that sampling periods are designed to avoid bias introduced by fine temporal scale sediment dynamics.

Item Type: Journal Article
Journal or Publication Title: Earth Surface Processes and Landforms
Uncontrolled Keywords: Rainfall simulator ; sediment concentration ; particle size
Subjects: ?? ge ??
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 26416
Deposited By: Dr Alona Armstrong
Deposited On: 19 May 2009 15:02
Refereed?: Yes
Published?: Published
Last Modified: 19 Jun 2018 02:29
Identification Number:

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