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Lab 5 (9)

# Lab 5 (9) - .t o Md = Median — lies at the 50(p59 0 M2 =...

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Unformatted text preview: *__-____.t._ o Md = Median — lies at the 50% / (p59 0 M2 = Mean — (qua + (p50 + (pm/3 0 With a perfectly normal grain size distribution Mo = Md = M2 0 Sorting = ((034 - cPug/4 ‘1' (\$95 - (Ps)/6-6 I 0very well "‘" 2very poor 0 Skewness — measure of how skew distribution is relative to the mean ' Skl = [(\$16 + (Ps4 - 2(Pso)/2((Ps4 - ‘Plé )] + [(‘Ps + \$95 - 2ti’:zo)/2((I?'95 - (Psll - -14—0—>t I -Sk = excess coarse ‘ A? l - Sk=0=perfectskew ,’ 3' _ I +Sk = excess ﬁne iwsc’" Mb . n 4 _ o Kurtosis - Jed"; ‘ﬁ pubic swims ' KG = (\$95 - ¢s)/2-44(<P75 - (P25) I KG = 1 = perfect graph I K; >1 = leptokurtic I KG<1 = platykurtic Why Grain Size Distribution? 1) Basic descriptive measures I How we name and classify sediments 2) Environmental characterization I Can tell you what the environment \1vas like - Friedman — river vs. beach sand 99 mag:” 0 Sorting vs. skewness ' ‘ ran: a ham 3 ' ° " Wave action on a beach removes me sedlments Rivers accumulate ﬁne sediments 0 Once the river slows, the ﬁne sediments trickle down into more coarse sediment pour spaces Waves at beaches keep ﬁne sediment suspended and it travels further out to sea Transportation Histogg: ...
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