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4 Theodore S. Metis et al. Suspended-sediment grain size is an important component of the Grand Canyon monitoring protocol (see section below). For the July 2001 test, the L1SST-IOOB provided median grain size data for sand that closely matched sand sizes obtained using the D-77 sampler (Fig. 4(a)). Grain-size data for sand from the January 2002, test also compared well with the D-77 data (Fig, 4(b )). A 5-week deployment of the -- CAliBRATED LlSST100B POINT MEASUREMENT o CROSS-SECTIONALLY INTEGRATED WITH 0-77 SAMPLER (a) -DISCHARGE OF WATER (b) 500 500 500 400 300 200 150 o in o " . '" Q 200 m 3" 100 -: ... oS 6400 ~ ~ z ~ 300 z o " a ~ 200 00 " w a ffi 100 ~ 00 " 00 100 o 100 o 50 0 0 ~ ~ ~ ~ g ~ ~ ~ ~ ~ ~ ~ 0 0 0 0 g g 0 g 0 0 0 0 0 0 0 ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ " ~ M ~ ~ ~ : ~ Fig. 3 (a) Comparison of sand concentrations and (b) silt & clay concentrations measured at the Grand Canyon gage using LlSST-lOOB (with 80% PRM) and the D- 77 bag sampler during the multi-day January 2002 test. Discharge data are from the Grand Canyon gauge. (a) _CALIBRATED ussnOOB POINT MEASUREMENT o CROSS-SECTIONAlLY Im1:GRATEOWlll-l 0-77 SAMPLER -DISCHARGE OF WATER (b) 0.20 500 0.20 0.19 0.19 400 0.18 0.18 E 0.17 E 0.17 10.16 , 300 a 0,16 0.15 a 0.14 z 0.15 < 00 200 0.13 " 0.14 w 0 0,12 a z 0.13 w 100 0.11 ~ 00 0,12 0.10 " 00 0.11 0 0.09 0.10 0.08 0.07 0.09 0:00 12:00 0:00 12:00 0:00 7-19.2001 7~20-2001 500 o 400 0; o " 300. ~ 200 ~ 1003:.. '" o Fig. 4 Comparison of median grain size (Dso) of sand measured at the Grand Canyon gage using LISST-IOOB and the D-77 bag sampler during (a) the one-day July 2001 test, and (b) the multi-day January 2002 test. Discharge data are from the Grand Canyon gauge. n:'360