Laserfiche WebLink
<br /> 10000 - <br /> 0 0 <br /> 0 CD <br /> 8000 (;) CD <br />~ CD <br />" 0 CD <br />.!:3 <br />'" <br />. 6000 l)3 <br />0 CD <br />H 0 l)3 <br />~ l)3 <br />.-< l)3 <br />. <br />'" <br />'" GJ l)3 <br />. 4000 <br />~ <br />. <br />.-< <br />, <br />~ c;:, l)3 l)3 Flume f!2 <br />u <br />u <br />., 2000 Flume 113 <br /> l)3 El <br /> 0 Flume 114 <br /> -'- -1.--__~___..L.__"~_, . <br /> 0 200 400 600 800 1000 1200 1400 <br /> Accumulated Flow (cubic-feet) <br /> <br /> <br />Table 4.10, Linear regression of accumulated <br /> salt load versus the square-root <br /> of time. <br /> Flume II Date Ace. Salt Load r2 <br /> _~s/minO. 5 <br /> 2 8/26/76 255.02 0.995 <br />N 3 8/26/76 371.12 0.999 <br />4 8/26/76 487.36 0.999 <br />0 2 9/9/76 163.37 0.998 <br />00 3 9/9/76 203,36 0.991 <br />I-" 4 9/9/76 394.22 0.998 <br /> <br />Table 4.11. Macrochannel salt loading per unit <br />channel length, <br /> <br />Flume /I <br /> <br />Salt Loading Rates <br />/f 0.5 <br />grams eet-min <br />Run #1 Run #2 <br /> <br />2 <br />3 <br />4 <br /> <br />0,64 <br />0.46 <br />0.41 <br /> <br />0.41 <br />0.25 <br />0.33 <br /> <br />J <br /> <br />I <br /> <br /> <br />, <br /> <br />, <br />I <br /> <br />ever, the general declining downstream trend <br />might be produced by 1) a loss of channel <br />flow by seepage (and thus a reduced wetted <br />perimeter), and 2) an associated reduction in <br />the sediment carrying capacity of the flow. <br /> <br />Sediment bedload samples (500 grams) <br />were taken during both occasions of induced <br />flow. Some of the sediment samples were air <br />dried for 90 days before being placed in <br />distilled water, and the remainder were <br />directly placed in 500 rol of distilled water. <br />For each sample, a the rate of salt released <br />as a function of time was examined. The <br />results are presented in Appendix D (Table <br />D.4), Figure 4.22 presents illustrative <br />sediment dissolution responses, one for a dry <br />sample and the other for a wet sample, each <br />adjusted to 500 grams of soil. Both dis- <br />solution rates are linear with respect to the <br />square-root of time, and both curves break at <br />about 11 hours (80 minO.S). The test <br />results also indicated that about 11.5 <br />days from the beginning the weight of the <br />released salt reached a maximum of aJ;'proxi- <br />mately 0.16 percent of the sediment weight. <br /> <br />The data plotted in Figure 4,22 confirm <br />a breakpoint in the dissolution rate of the <br />sort presented in Figure 4.16. From the <br /> <br />Figure 4.19. Accumulated salt load versus accumulated flow at flumes 2, 3, and 4 of the macr~ <br />channel, August 26, 1976, <br /> <br />39 <br /> <br />