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

Research output: Contribution to journalJournal article

Published

Journal publication date07/2009
JournalEarth Surface Processes and Landforms
Journal number9
Volume34
Number of pages5
Pages1310-1314
Original languageEnglish

Abstract

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.