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Spatial Variability in Rainfall Erosivity versus Rainfall Depth

Implications for Sediment Yield

^a Balance Hydrologics, Inc., 841 Folger Ave., Berkeley, CA 94710
^b Earth and Environmental Sciences Division, Los Alamos National Laboratory, Mail Stop J495, Los Alamos, NM 87545, currently, Institute for the Study of Planet Earth, School of Natural Resources, and Department of Ecology & Evolutionary Biology, University of Arizona, Tucson AZ 85721-0043
^c Department of Earth Resources, Colorado State University, Fort Collins, CO 80523

View larger version (33K): [in a new window]   Fig. 1. (a) Precipitation depth and erosivity distributions across 12 rain gauges for 14 convective thunderstorms (n = 12) between June and September 2000 and 2001. (b) Coefficient of variation for precipitation depth and rainfall erosivity across 14 storms (n = 14). The horizontal line represents the median. Boxes represent 25th and 75th percentiles and the vertical lines extend from the 10th and 90th percentiles. Closed circles represent observations outside the 10th and 90th percentile ranges.

View larger version (71K): [in a new window]   Fig. 2. Storm rainfall erosivity gradient across 12 rain gauges for 9 Aug. 2000. Rain gauges are indicated by the open circles. Rainfall erosivity units are newtons per hour.

View larger version (55K): [in a new window]   Fig. 3. Relationship of rainfall erosivity vs. sediment yield (log/log) and rainfall depth vs. sediment yield (log/log) for four selected microwatersheds and associated rain gauges across 14 convective thunderstorms or rainfall–runoff events.